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comparison mercurial/revlogutils/deltas.py @ 40979:ba09db267cb6

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delta: ignore base whose chains already don't match expectations If we know the existing chain does not match our criteria, there is no point to build a delta to append. This is especially useful when dealing with a full text much smaller than its parent. In that case, the parent chain is probably already too large. example affected manifest write before: 1.421005s after: 0.815520s (-42%)
author Boris Feld <boris.feld@octobus.net>
date Mon, 17 Dec 2018 10:46:37 +0100
parents 42f59d3f714d
children b373477948df
comparison
equal deleted inserted replaced
40978:42f59d3f714d 40979:ba09db267cb6
652 continue 652 continue
653 if sparse and revlog.rawsize(rev) < (textlen // LIMIT_BASE2TEXT): 653 if sparse and revlog.rawsize(rev) < (textlen // LIMIT_BASE2TEXT):
654 continue 654 continue
655 # no delta for rawtext-changing revs (see "candelta" for why) 655 # no delta for rawtext-changing revs (see "candelta" for why)
656 if revlog.flags(rev) & REVIDX_RAWTEXT_CHANGING_FLAGS: 656 if revlog.flags(rev) & REVIDX_RAWTEXT_CHANGING_FLAGS:
657 continue
658 # If we reach here, we are about to build and test a delta.
659 # The delta building process will compute the chaininfo in all
660 # case, since that computation is cached, it is fine to access it
661 # here too.
662 chainlen, chainsize = revlog._chaininfo(rev)
663 # if chain will be too long, skip base
664 if revlog._maxchainlen and chainlen >= revlog._maxchainlen:
665 continue
666 # if chain already have too much data, skip base
667 if deltas_limit < chainsize:
657 continue 668 continue
658 group.append(rev) 669 group.append(rev)
659 if group: 670 if group:
660 # XXX: in the sparse revlog case, group can become large, 671 # XXX: in the sparse revlog case, group can become large,
661 # impacting performances. Some bounding or slicing mecanism 672 # impacting performances. Some bounding or slicing mecanism