diff options
| author | emaste <emaste@FreeBSD.org> | 2014-05-23 17:46:00 +0000 |
|---|---|---|
| committer | emaste <emaste@FreeBSD.org> | 2014-05-23 17:46:00 +0000 |
| commit | e7613520673b6f7fb6b5b77f7c9ac3b31982f6ae (patch) | |
| tree | c7a21d5b2af4d4b6e5afe344d322a3680e62de28 /rescue/Makefile | |
| parent | 80044281eb7ca569563950bc5c86bcd1a4d9c7c6 (diff) | |
| download | FreeBSD-src-e7613520673b6f7fb6b5b77f7c9ac3b31982f6ae.zip FreeBSD-src-e7613520673b6f7fb6b5b77f7c9ac3b31982f6ae.tar.gz | |
MFC r266208: Speed up pmcstat by improving string hash
In one case generating callgraph output from a 24MB system-wide sampling
data file took 17.4 seconds on average. Profiling showed pmcstat
spending a lot of time in strcmp, due to hash collisions.
Replacing the XOR-only hash with FNV-1a reduces the run time for my
test by 40%.
Diffstat (limited to 'rescue/Makefile')
0 files changed, 0 insertions, 0 deletions
