Mercurial > public > mercurial-scm > hg-stable
diff tests/test-debugcommands.t @ 27263:4efb36ecaaec
commands: add debugdeltachain command
We have debug commands for displaying overall revlog statistics
(debugrevlog) and for dumping a revlog index (debugindex). As part
of investigating various aspects of revlog behavior and performance,
I found it important to have an understanding of how revlog
delta chains behave in practice.
This patch implements a "debugdeltachain" command. For each revision
in a revlog, it dumps information about the delta chain. Which delta
chain it is part of, length of the delta chain, distance since base
revision, info about base revision, size of the delta chain, etc. The
generic formatting facility is used, which means we can templatize
output and get machine readable output like JSON.
This command has already uncovered some weird history in
mozilla-central I didn't know about. So I think it's valuable.
| author | Gregory Szorc <gregory.szorc@gmail.com> |
|---|---|
| date | Sat, 05 Dec 2015 23:37:46 -0800 |
| parents | 0438df737fb7 |
| children | 932b18c95e11 |
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--- a/tests/test-debugcommands.t Sat Oct 24 19:56:39 2015 +0100 +++ b/tests/test-debugcommands.t Sat Dec 05 23:37:46 2015 -0800 @@ -44,6 +44,32 @@ rev flag offset length size ..... link p1 p2 nodeid (re) 0 0000 0 3 2 .... 0 -1 -1 b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 (re) +debugdelta chain basic output + + $ hg debugdeltachain -m + rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio + 0 1 1 -1 base 44 43 44 1.02326 44 0 0.00000 + + $ hg debugdeltachain -m -T '{rev} {chainid} {chainlen}\n' + 0 1 1 + + $ hg debugdeltachain -m -Tjson + [ + { + "chainid": 1, + "chainlen": 1, + "chainratio": 1.02325581395, + "chainsize": 44, + "compsize": 44, + "deltatype": "base", + "extradist": 0, + "extraratio": 0.0, + "lindist": 44, + "prevrev": -1, + "rev": 0, + "uncompsize": 43 + } + ] Test max chain len $ cat >> $HGRCPATH << EOF