Mercurial > hg
view setup_mpatch_cffi.py @ 30289:1f92056c4066
revlog: optimize _chunkraw when startrev==endrev
In many cases, _chunkraw() is called with startrev==endrev. When
this is true, we can avoid an extra index lookup and some other
minor operations.
On the mozilla-unified repo, `hg perfrevlogchunks -c` says this
has the following impact:
! read w/ reused fd
! wall 0.371846 comb 0.370000 user 0.350000 sys 0.020000 (best of 27)
! wall 0.337930 comb 0.330000 user 0.300000 sys 0.030000 (best of 30)
! read batch w/ reused fd
! wall 0.014952 comb 0.020000 user 0.000000 sys 0.020000 (best of 197)
! wall 0.014866 comb 0.010000 user 0.000000 sys 0.010000 (best of 196)
So, we've gone from ~25x slower than batch to ~22.5x slower.
At this point, there's probably not much else we can do except
implement an optimized function in the index itself, including in C.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 23 Oct 2016 10:40:33 -0700 |
parents | 90af59b40d8a |
children |
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from __future__ import absolute_import import cffi import os ffi = cffi.FFI() mpatch_c = os.path.join(os.path.join(os.path.dirname(__file__), 'mercurial', 'mpatch.c')) ffi.set_source("_mpatch_cffi", open(mpatch_c).read(), include_dirs=["mercurial"]) ffi.cdef(""" struct mpatch_frag { int start, end, len; const char *data; }; struct mpatch_flist { struct mpatch_frag *base, *head, *tail; }; extern "Python" struct mpatch_flist* cffi_get_next_item(void*, ssize_t); int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist** res); ssize_t mpatch_calcsize(size_t len, struct mpatch_flist *l); void mpatch_lfree(struct mpatch_flist *a); static int mpatch_apply(char *buf, const char *orig, size_t len, struct mpatch_flist *l); struct mpatch_flist *mpatch_fold(void *bins, struct mpatch_flist* (*get_next_item)(void*, ssize_t), ssize_t start, ssize_t end); """) if __name__ == '__main__': ffi.compile()