Mercurial > hg
view tests/test-issue842.t @ 27475:a2e2a8fa5fd1
revlog: avoid string slice when decompressing u* chunks
Revlog chunks can be stored uncompressed. If the first byte of the
raw data is \0, we store the data as is. Else we prefix it with 'u'.
Before, we performed a string slice to strip out the 'u' prefix.
With this patch, we use a buffer to avoid an extra memory copy and
associated garbage collection overhead.
I was unable to verify any performance impact of this patch. For both
mozilla-central and the hg repos, the number of manifest revisions
with 'u' prefixes is very small - under 1%. So this change likely
isn't called enough to have an impact on manifest reading. However,
the reasoning behind this change is solid, so it should be safe.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 20 Dec 2015 16:00:27 -0800 |
parents | 2fc86d92c4a9 |
children | 55c6ebd11cb9 |
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https://bz.mercurial-scm.org/842 $ hg init $ echo foo > a $ hg ci -Ama adding a $ hg up -r0000 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo bar > a Should issue new head warning: $ hg ci -Amb adding a created new head $ hg up -r0000 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo stuffy > a Should not issue new head warning: $ hg ci -q -Amc $ hg up -r0000 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo crap > a $ hg branch testing marked working directory as branch testing (branches are permanent and global, did you want a bookmark?) Should not issue warning: $ hg ci -q -Amd