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| author | Jeff Hostetler <jeffhost@microsoft.com> | 2017-03-23 13:47:04 +0000 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2017-03-24 11:00:03 -0700 |
| commit | ea194895326d10f6e255eee05ac25ab5ae096dd9 (patch) | |
| tree | b7860eb144bd3205fd94bec32bb12a5d6dc06889 /cache.h | |
| parent | 846df809bc671d6487fa2be7550e3ed2b62e62f9 (diff) | |
| download | git-ea194895326d10f6e255eee05ac25ab5ae096dd9.tar.gz | |
name-hash: add test-lazy-init-name-hash
Add t/helper/test-lazy-init-name-hash.c test code
to demonstrate performance times for lazy_init_name_hash()
using the original single-threaded and the new multi-threaded
code paths.
Includes a --dump option to dump the created hashmaps to
stdout. You can use this to run both code paths and
confirm that they generate the same hashmaps.
Includes a --analyze option to analyze performance of both
code paths over a range of index sizes to help you find a
lower bound for the LAZY_THREAD_COST in name-hash.c.
For example, passing "-a 4000" will set "istate.cache_nr"
to 4000 and then try the multi-threaded code -- probably
giving 2 threads with 2000 entries each. It will then
run both the single-threaded (1x4000) and the multi-threaded
(2x2000) and compare the times. It will then repeat the
test with 8000, 12000, and etc. so that you can see the
cross over.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'cache.h')
| -rw-r--r-- | cache.h | 1 |
1 files changed, 1 insertions, 0 deletions
@@ -343,6 +343,7 @@ struct index_state { extern struct index_state the_index; /* Name hashing */ +extern int test_lazy_init_name_hash(struct index_state *istate, int try_threaded); extern void add_name_hash(struct index_state *istate, struct cache_entry *ce); extern void remove_name_hash(struct index_state *istate, struct cache_entry *ce); extern void free_name_hash(struct index_state *istate); |