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annotate tests/test-stdio.py @ 45892:06b64fabf91c

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copies: cache the ancestor checking call when tracing copy A good share of the time spent in this function is spent doing ancestors checking. To avoid spending time in duplicated call, we cache the result of calls. In the slower case, this provide a quite significant performance boost. Below are the result for a set of selected pairs (many of them pathological): (And further down is another table that summarize the current state of filelog based vs changeset base copy tracing) The benchmark have been configured to be killed after 6 minutes of runtime, which mean that any detect slower than 2 minutes will be marked as "killed". This drop some useful information about how much slower these case are? but also prevent 99% of the benchmark time to be spent on case that can be labelled "very slow" anyway. Repo Case Source-Rev Dest-Rev Old-Time New-Time Difference Factor ------------------------------------------------------------------------------------------------------------------------------------ mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 0.000044 s, 0.000044 s, +0.000000 s, ? 1.0000 mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 0.000138 s, 0.000138 s, +0.000000 s, ? 1.0000 mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 0.005067 s, 0.005052 s, -0.000015 s, ? 0.9970 pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 0.000218 s, 0.000219 s, +0.000001 s, ? 1.0046 pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 0.000053 s, 0.000055 s, +0.000002 s, ? 1.0377 pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 0.000125 s, 0.000128 s, +0.000003 s, ? 1.0240 pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 0.001098 s, 0.001089 s, -0.000009 s, ? 0.9918 pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 0.017546 s, 0.017407 s, -0.000139 s, ? 0.9921 pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 0.096723 s, 0.094175 s, -0.002548 s, ? 0.9737 pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 0.271796 s, 0.238009 s, -0.033787 s, ? 0.8757 pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 0.128602 s, 0.125876 s, -0.002726 s, ? 0.9788 pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 7.086742 s, 3.581556 s, -3.505186 s, ? 0.5054 pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 0.016634 s, 0.016721 s, +0.000087 s, ? 1.0052 pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 0.254225 s, 0.242367 s, -0.011858 s, ? 0.9534 netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 0.000166 s, 0.000165 s, -0.000001 s, ? 0.9940 netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 0.000118 s, 0.000114 s, -0.000004 s, ? 0.9661 netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 0.000296 s, 0.000296 s, +0.000000 s, ? 1.0000 netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 0.001137 s, 0.001124 s, -0.000013 s, ? 0.9886 netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 0.014133 s, 0.013060 s, -0.001073 s, ? 0.9241 netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 0.016988 s, 0.017112 s, +0.000124 s, ? 1.0073 netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 0.676361 s, 0.660350 s, -0.016011 s, ? 0.9763 netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 12.515149 s, 10.032499 s, -2.482650 s, ? 0.8016 mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 0.000186 s, 0.000189 s, +0.000003 s, ? 1.0161 mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 0.000459 s, 0.000462 s, +0.000003 s, ? 1.0065 mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 0.000273 s, 0.000270 s, -0.000003 s, ? 0.9890 mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 0.001503 s, 0.001474 s, -0.000029 s, ? 0.9807 mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 0.004862 s, 0.004806 s, -0.000056 s, ? 0.9885 mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 0.088291 s, 0.085150 s, -0.003141 s, ? 0.9644 mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.007113 s, 0.007064 s, -0.000049 s, ? 0.9931 mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.004687 s, 0.004741 s, +0.000054 s, ? 1.0115 mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 0.198710 s, 0.190133 s, -0.008577 s, ? 0.9568 mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 0.036068 s, 0.035651 s, -0.000417 s, ? 0.9884 mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 0.465362 s, 0.440694 s, -0.024668 s, ? 0.9470 mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 24.519684 s, 18.454163 s, -6.065521 s, ? 0.7526 mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 42.711897 s, 31.562719 s, -11.149178 s, ? 0.7390 mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 0.001201 s, 0.001189 s, -0.000012 s, ? 0.9900 mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 0.001216 s, 0.001204 s, -0.000012 s, ? 0.9901 mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 0.000595 s, 0.000586 s, -0.000009 s, ? 0.9849 mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 0.001856 s, 0.001845 s, -0.000011 s, ? 0.9941 mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 0.064936 s, 0.063822 s, -0.001114 s, ? 0.9828 mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 0.090601 s, 0.088038 s, -0.002563 s, ? 0.9717 mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.007510 s, 0.007389 s, -0.000121 s, ? 0.9839 mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.004911 s, 0.004868 s, -0.000043 s, ? 0.9912 mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 0.233231 s, 0.222450 s, -0.010781 s, ? 0.9538 mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 0.419989 s, 0.370675 s, -0.049314 s, ? 0.8826 mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 0.401521 s, 0.358020 s, -0.043501 s, ? 0.8917 mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 0.179555 s, 0.145235 s, -0.034320 s, ? 0.8089 mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 0.038004 s, 0.037606 s, -0.000398 s, ? 0.9895 mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 52.838482 s, 7.382439 s, -45.456043 s, ? 0.1397 mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 8.705874 s, 7.273506 s, -1.432368 s, ? 0.8355 mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 1.126708 s, 1.074593 s, -0.052115 s, ? 0.9537 mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 83.854020 s, 27.746195 s, -56.107825 s, ? 0.3309 Below is a table comparing the runtime of the current "filelog centric" algorithm, with the "changeset centric" one, we just modified. The changeset centric algorithm is a significant win in many scenario, but they are still various cases where it is quite slower. When many revision has to be considered the cost of retrieving the copy information, creating new dictionaries, merging dictionaries and checking if revision are ancestors of each other can slow things down. The rest of this series, will introduce a rust version of the copy tracing code to deal with most of theses issues. Repo Case Source-Rev Dest-Rev filelog sidedata Difference Factor --------------------------------------------------------------------------------------------------------------------------------------- mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 0.000914 s, 0.000044 s, - 0.000870 s, ? 0.048140 mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 0.001812 s, 0.000138 s, - 0.001674 s, ? 0.076159 mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 0.017954 s, 0.005052 s, - 0.012902 s, ? 0.281386 pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 0.001509 s, 0.000219 s, - 0.001290 s, ? 0.145129 pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 0.206881 s, 0.000055 s, - 0.206826 s, ? 0.000266 pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 0.016951 s, 0.000128 s, - 0.016823 s, ? 0.007551 pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 0.019096 s, 0.001089 s, - 0.018007 s, ? 0.057028 pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 0.762506 s, 0.017407 s, - 0.745099 s, ? 0.022829 pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 1.179211 s, 0.094175 s, - 1.085036 s, ? 0.079863 pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 1.249058 s, 0.238009 s, - 1.011049 s, ? 0.190551 pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 1.614107 s, 0.125876 s, - 1.488231 s, ? 0.077985 pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 0.001064 s, 3.581556 s, + 3.580492 s, ? 3366.124060 pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 1.061275 s, 0.016721 s, - 1.044554 s, ? 0.015756 pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 1.341119 s, 0.242367 s, - 1.098752 s, ? 0.180720 netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 0.027803 s, 0.000165 s, - 0.027638 s, ? 0.005935 netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 0.130014 s, 0.000114 s, - 0.129900 s, ? 0.000877 netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 0.024990 s, 0.000296 s, - 0.024694 s, ? 0.011845 netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 0.052201 s, 0.001124 s, - 0.051077 s, ? 0.021532 netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 0.037642 s, 0.013060 s, - 0.024582 s, ? 0.346953 netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 0.197086 s, 0.017112 s, - 0.179974 s, ? 0.086825 netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 0.935148 s, 0.660350 s, - 0.274798 s, ? 0.706145 netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 3.920674 s, 10.032499 s, + 6.111825 s, ? 2.558871 mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 0.024232 s, 0.000189 s, - 0.024043 s, ? 0.007800 mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 0.141483 s, 0.000462 s, - 0.141021 s, ? 0.003265 mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 0.025775 s, 0.000270 s, - 0.025505 s, ? 0.010475 mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 0.084922 s, 0.001474 s, - 0.083448 s, ? 0.017357 mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 0.194784 s, 0.004806 s, - 0.189978 s, ? 0.024673 mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 2.161103 s, 0.085150 s, - 2.075953 s, ? 0.039401 mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.089347 s, 0.007064 s, - 0.082283 s, ? 0.079063 mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.732171 s, 0.004741 s, - 0.727430 s, ? 0.006475 mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 1.157287 s, 0.190133 s, - 0.967154 s, ? 0.164292 mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 6.726568 s, 0.035651 s, - 6.690917 s, ? 0.005300 mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 3.266229 s, 0.440694 s, - 2.825535 s, ? 0.134924 mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 15.860534 s, 18.454163 s, + 2.593629 s, ? 1.163527 mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 20.450475 s, 31.562719 s, +11.112244 s, ? 1.543373 mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 0.080442 s, 0.001189 s, - 0.079253 s, ? 0.014781 mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 0.497672 s, 0.001204 s, - 0.496468 s, ? 0.002419 mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 0.021183 s, 0.000586 s, - 0.020597 s, ? 0.027664 mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 0.230991 s, 0.001845 s, - 0.229146 s, ? 0.007987 mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 1.118461 s, 0.063822 s, - 1.054639 s, ? 0.057062 mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 2.206083 s, 0.088038 s, - 2.118045 s, ? 0.039907 mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 0.089404 s, 0.007389 s, - 0.082015 s, ? 0.082647 mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 0.733043 s, 0.004868 s, - 0.728175 s, ? 0.006641 mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 1.163367 s, 0.222450 s, - 0.940917 s, ? 0.191212 mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 0.085456 s, 0.370675 s, + 0.285219 s, ? 4.337612 mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 0.083601 s, 0.358020 s, + 0.274419 s, ? 4.282485 mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 7.366614 s, 0.145235 s, - 7.221379 s, ? 0.019715 mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 6.664464 s, 0.037606 s, - 6.626858 s, ? 0.005643 mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 7.467836 s, 7.382439 s, - 0.085397 s, ? 0.988565 mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 9.801294 s, 7.273506 s, - 2.527788 s, ? 0.742097 mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 0.091886 s, killed mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 26.491140 s, 1.074593 s, -25.416547 s, ? 0.040564 mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 0.092863 s, killed mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 0.226823 s, killed mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 18.914630 s, 27.746195 s, + 8.831565 s, ? 1.466917 mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 21.198903 s, killed mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 24.952268 s, killed Differential Revision: https://phab.mercurial-scm.org/D9296
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 02 Nov 2020 11:03:56 +0100
parents c102b704edb5
children 23f5ed6dbcb1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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c102b704edb5 global: use python3 in shebangs
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1 #!/usr/bin/env python3
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2 """
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3 Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`.
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4 """
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5 from __future__ import absolute_import
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6
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7 import contextlib
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8 import errno
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9 import os
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10 import signal
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11 import subprocess
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12 import sys
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13 import tempfile
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14 import unittest
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15
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16 from mercurial import pycompat, util
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18
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19 if pycompat.ispy3:
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20
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21 def set_noninheritable(fd):
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22 # On Python 3, file descriptors are non-inheritable by default.
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23 pass
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24
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25
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26 else:
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27 if pycompat.iswindows:
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28 # unused
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29 set_noninheritable = None
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30 else:
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31 import fcntl
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32
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33 def set_noninheritable(fd):
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34 old = fcntl.fcntl(fd, fcntl.F_GETFD)
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35 fcntl.fcntl(fd, fcntl.F_SETFD, old | fcntl.FD_CLOEXEC)
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36
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37
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38 TEST_BUFFERING_CHILD_SCRIPT = r'''
45038
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39 import os
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40
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41 from mercurial import dispatch
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42 from mercurial.utils import procutil
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43
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44 dispatch.initstdio()
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45 procutil.{stream}.write(b'aaa')
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46 os.write(procutil.{stream}.fileno(), b'[written aaa]')
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47 procutil.{stream}.write(b'bbb\n')
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48 os.write(procutil.{stream}.fileno(), b'[written bbb\\n]')
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49 '''
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50 UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]'
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51 LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]'
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52 FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n'
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53
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54
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55 TEST_LARGE_WRITE_CHILD_SCRIPT = r'''
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56 import os
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57 import signal
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58 import sys
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59
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60 from mercurial import dispatch
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61 from mercurial.utils import procutil
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62
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63 signal.signal(signal.SIGINT, lambda *x: None)
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64 dispatch.initstdio()
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65 write_result = procutil.{stream}.write(b'x' * 1048576)
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66 with os.fdopen(
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67 os.open({write_result_fn!r}, os.O_WRONLY | getattr(os, 'O_TEMPORARY', 0)),
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68 'w',
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69 ) as write_result_f:
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70 write_result_f.write(str(write_result))
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71 '''
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72
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73
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74 TEST_BROKEN_PIPE_CHILD_SCRIPT = r'''
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75 import os
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76 import pickle
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77
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78 from mercurial import dispatch
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79 from mercurial.utils import procutil
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80
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81 dispatch.initstdio()
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82 procutil.stdin.read(1) # wait until parent process closed pipe
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83 try:
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84 procutil.{stream}.write(b'test')
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85 procutil.{stream}.flush()
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86 except EnvironmentError as e:
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87 with os.fdopen(
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88 os.open(
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89 {err_fn!r},
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90 os.O_WRONLY
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91 | getattr(os, 'O_BINARY', 0)
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92 | getattr(os, 'O_TEMPORARY', 0),
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93 ),
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94 'wb',
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95 ) as err_f:
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96 pickle.dump(e, err_f)
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97 # Exit early to suppress further broken pipe errors at interpreter shutdown.
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98 os._exit(0)
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99 '''
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100
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101
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102 @contextlib.contextmanager
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103 def _closing(fds):
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104 try:
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105 yield
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106 finally:
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107 for fd in fds:
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108 try:
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109 os.close(fd)
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110 except EnvironmentError:
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111 pass
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parents:
diff changeset
112
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113
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114 # In the following, we set the FDs non-inheritable mainly to make it possible
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115 # for tests to close the receiving end of the pipe / PTYs.
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116
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117
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118 @contextlib.contextmanager
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119 def _devnull():
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120 devnull = os.open(os.devnull, os.O_WRONLY)
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121 # We don't have a receiving end, so it's not worth the effort on Python 2
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122 # on Windows to make the FD non-inheritable.
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123 with _closing([devnull]):
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124 yield (None, devnull)
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125
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126
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127 @contextlib.contextmanager
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128 def _pipes():
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129 rwpair = os.pipe()
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130 # Pipes are already non-inheritable on Windows.
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131 if not pycompat.iswindows:
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132 set_noninheritable(rwpair[0])
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133 set_noninheritable(rwpair[1])
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134 with _closing(rwpair):
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135 yield rwpair
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136
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137
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138 @contextlib.contextmanager
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139 def _ptys():
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140 if pycompat.iswindows:
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141 raise unittest.SkipTest("PTYs are not supported on Windows")
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142 import pty
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143 import tty
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144
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145 rwpair = pty.openpty()
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146 set_noninheritable(rwpair[0])
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147 set_noninheritable(rwpair[1])
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148 with _closing(rwpair):
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149 tty.setraw(rwpair[0])
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150 yield rwpair
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151
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152
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153 def _readall(fd, buffer_size, initial_buf=None):
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154 buf = initial_buf or []
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155 while True:
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156 try:
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157 s = os.read(fd, buffer_size)
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158 except OSError as e:
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159 if e.errno == errno.EIO:
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160 # If the child-facing PTY got closed, reading from the
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161 # parent-facing PTY raises EIO.
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162 break
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163 raise
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164 if not s:
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165 break
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166 buf.append(s)
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167 return b''.join(buf)
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168
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169
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170 class TestStdio(unittest.TestCase):
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171 def _test(
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172 self,
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173 child_script,
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174 stream,
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175 rwpair_generator,
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176 check_output,
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177 python_args=[],
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178 post_child_check=None,
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179 stdin_generator=None,
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180 ):
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181 assert stream in ('stdout', 'stderr')
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182 if stdin_generator is None:
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183 stdin_generator = open(os.devnull, 'rb')
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184 with rwpair_generator() as (
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185 stream_receiver,
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186 child_stream,
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187 ), stdin_generator as child_stdin:
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188 proc = subprocess.Popen(
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189 [sys.executable] + python_args + ['-c', child_script],
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190 stdin=child_stdin,
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191 stdout=child_stream if stream == 'stdout' else None,
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192 stderr=child_stream if stream == 'stderr' else None,
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193 )
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194 try:
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195 os.close(child_stream)
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196 if stream_receiver is not None:
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197 check_output(stream_receiver, proc)
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198 except: # re-raises
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199 proc.terminate()
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200 raise
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201 finally:
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202 retcode = proc.wait()
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203 self.assertEqual(retcode, 0)
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204 if post_child_check is not None:
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205 post_child_check()
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206
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207 def _test_buffering(
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208 self, stream, rwpair_generator, expected_output, python_args=[]
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209 ):
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210 def check_output(stream_receiver, proc):
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211 self.assertEqual(_readall(stream_receiver, 1024), expected_output)
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212
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213 self._test(
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214 TEST_BUFFERING_CHILD_SCRIPT.format(stream=stream),
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215 stream,
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216 rwpair_generator,
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217 check_output,
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218 python_args,
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219 )
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220
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221 def test_buffering_stdout_devnull(self):
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222 self._test_buffering('stdout', _devnull, None)
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223
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224 def test_buffering_stdout_pipes(self):
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225 self._test_buffering('stdout', _pipes, FULLY_BUFFERED)
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226
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227 def test_buffering_stdout_ptys(self):
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228 self._test_buffering('stdout', _ptys, LINE_BUFFERED)
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229
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230 def test_buffering_stdout_devnull_unbuffered(self):
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231 self._test_buffering('stdout', _devnull, None, python_args=['-u'])
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232
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233 def test_buffering_stdout_pipes_unbuffered(self):
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234 self._test_buffering('stdout', _pipes, UNBUFFERED, python_args=['-u'])
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235
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236 def test_buffering_stdout_ptys_unbuffered(self):
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237 self._test_buffering('stdout', _ptys, UNBUFFERED, python_args=['-u'])
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238
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239 if not pycompat.ispy3 and not pycompat.iswindows:
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240 # On Python 2 on non-Windows, we manually open stdout in line-buffered
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241 # mode if connected to a TTY. We should check if Python was configured
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242 # to use unbuffered stdout, but it's hard to do that.
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243 test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure(
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244 test_buffering_stdout_ptys_unbuffered
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245 )
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246
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247 def _test_large_write(self, stream, rwpair_generator, python_args=[]):
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248 if not pycompat.ispy3 and pycompat.isdarwin:
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249 # Python 2 doesn't always retry on EINTR, but the libc might retry.
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250 # So far, it was observed only on macOS that EINTR is raised at the
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251 # Python level. As Python 2 support will be dropped soon-ish, we
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252 # won't attempt to fix it.
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253 raise unittest.SkipTest("raises EINTR on macOS")
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254
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255 def check_output(stream_receiver, proc):
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256 if not pycompat.iswindows:
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257 # On Unix, we can provoke a partial write() by interrupting it
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258 # by a signal handler as soon as a bit of data was written.
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259 # We test that write() is called until all data is written.
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260 buf = [os.read(stream_receiver, 1)]
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261 proc.send_signal(signal.SIGINT)
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262 else:
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263 # On Windows, there doesn't seem to be a way to cause partial
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264 # writes.
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265 buf = []
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266 self.assertEqual(
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267 _readall(stream_receiver, 131072, buf), b'x' * 1048576
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268 )
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269
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270 def post_child_check():
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271 write_result_str = write_result_f.read()
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272 if pycompat.ispy3:
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273 # On Python 3, we test that the correct number of bytes is
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274 # claimed to have been written.
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275 expected_write_result_str = '1048576'
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276 else:
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277 # On Python 2, we only check that the large write does not
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278 # crash.
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279 expected_write_result_str = 'None'
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280 self.assertEqual(write_result_str, expected_write_result_str)
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281
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282 with tempfile.NamedTemporaryFile('r') as write_result_f:
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283 self._test(
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284 TEST_LARGE_WRITE_CHILD_SCRIPT.format(
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285 stream=stream, write_result_fn=write_result_f.name
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286 ),
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287 stream,
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288 rwpair_generator,
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289 check_output,
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290 python_args,
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291 post_child_check=post_child_check,
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292 )
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293
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294 def test_large_write_stdout_devnull(self):
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295 self._test_large_write('stdout', _devnull)
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296
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297 def test_large_write_stdout_pipes(self):
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298 self._test_large_write('stdout', _pipes)
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299
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300 def test_large_write_stdout_ptys(self):
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301 self._test_large_write('stdout', _ptys)
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302
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303 def test_large_write_stdout_devnull_unbuffered(self):
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304 self._test_large_write('stdout', _devnull, python_args=['-u'])
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305
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306 def test_large_write_stdout_pipes_unbuffered(self):
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307 self._test_large_write('stdout', _pipes, python_args=['-u'])
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308
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309 def test_large_write_stdout_ptys_unbuffered(self):
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310 self._test_large_write('stdout', _ptys, python_args=['-u'])
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311
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312 def test_large_write_stderr_devnull(self):
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313 self._test_large_write('stderr', _devnull)
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314
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315 def test_large_write_stderr_pipes(self):
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316 self._test_large_write('stderr', _pipes)
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317
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318 def test_large_write_stderr_ptys(self):
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319 self._test_large_write('stderr', _ptys)
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320
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321 def test_large_write_stderr_devnull_unbuffered(self):
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322 self._test_large_write('stderr', _devnull, python_args=['-u'])
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323
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324 def test_large_write_stderr_pipes_unbuffered(self):
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325 self._test_large_write('stderr', _pipes, python_args=['-u'])
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326
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327 def test_large_write_stderr_ptys_unbuffered(self):
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328 self._test_large_write('stderr', _ptys, python_args=['-u'])
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329
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330 def _test_broken_pipe(self, stream):
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331 assert stream in ('stdout', 'stderr')
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332
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333 def check_output(stream_receiver, proc):
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334 os.close(stream_receiver)
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335 proc.stdin.write(b'x')
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336 proc.stdin.close()
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337
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338 def post_child_check():
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339 err = util.pickle.load(err_f)
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340 self.assertEqual(err.errno, errno.EPIPE)
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341 self.assertEqual(err.strerror, "Broken pipe")
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342
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343 with tempfile.NamedTemporaryFile('rb') as err_f:
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344 self._test(
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345 TEST_BROKEN_PIPE_CHILD_SCRIPT.format(
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346 stream=stream, err_fn=err_f.name
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347 ),
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348 stream,
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349 _pipes,
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350 check_output,
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351 post_child_check=post_child_check,
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352 stdin_generator=util.nullcontextmanager(subprocess.PIPE),
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353 )
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354
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355 def test_broken_pipe_stdout(self):
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356 self._test_broken_pipe('stdout')
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357
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358 def test_broken_pipe_stderr(self):
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359 self._test_broken_pipe('stderr')
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360
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361
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362 if __name__ == '__main__':
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363 import silenttestrunner
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364
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365 silenttestrunner.main(__name__)