> If it's not a problem, I'd love to see timings for your case with just
> the first patch, and then with both.
Thanks for the swift response, much appreciated Jeff!
Here are the timings for the two patches:
Patch 1 on top of 33d4221c79
Elapsed System User
Min. :6.110 Min. :0.6700 Min. :0.3600
1st Qu.:6.580 1st Qu.:0.6900 1st Qu.:0.3900
Median :7.260 Median :0.7100 Median :0.4100
Mean :7.347 Mean :0.7248 Mean :0.4214
3rd Qu.:8.000 3rd Qu.:0.7400 3rd Qu.:0.4600
Max. :8.860 Max. :0.8700 Max. :0.5100
I've had to slightly tweak your second patch (`freshened` was never
set) but applying the modified patch yielded even better results
compared to patch 1:
Elapsed System User
Min. :0.38 Min. :0.03000 Min. :0.2900
1st Qu.:0.38 1st Qu.:0.04000 1st Qu.:0.3100
Median :0.39 Median :0.06000 Median :0.3200
Mean :0.43 Mean :0.05667 Mean :0.3519
3rd Qu.:0.42 3rd Qu.:0.07000 3rd Qu.:0.3600
Max. :0.68 Max. :0.08000 Max. :0.5700
This is pretty much back to the "before" state.
The graph really tells the whole story:
https://bytebucket.org/snippets/ssaasen/GeRE/raw/7367353a58c50ccd7c493af40ffb6ba1533e1490/git-merge-timing-patched.png
(After is the change in #33d4221, Before the parent of #33d4221 and so on)
The graph and the NFS stats can be found here:
https://bitbucket.org/snippets/ssaasen/GeRE
My tweaked version of your second patch is:
diff --git a/cache.h b/cache.h
index 51ee856..8982055 100644
--- a/cache.h
+++ b/cache.h
@@ -1168,6 +1168,7 @@ extern struct packed_git {
int pack_fd;
unsigned pack_local:1,
pack_keep:1,
+ freshened:1,
do_not_close:1;
unsigned char sha1[20];
/* something like ".git/objects/pack/xxxxx.pack" */
diff --git a/sha1_file.c b/sha1_file.c
index bc6322e..c0ccd4b 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2999,7 +2999,11 @@ static int freshen_loose_object(const unsigned
char *sha1)
static int freshen_packed_object(const unsigned char *sha1)
{
struct pack_entry e;
- return find_pack_entry(sha1, &e) && freshen_file(e.p->pack_name);
+ if (!find_pack_entry(sha1, &e))
+ return 0;
+ if (e.p->freshened)
+ return 1;
+ return e.p->freshened = freshen_file(e.p->pack_name);
}
int write_sha1_file(const void *buf, unsigned long len, const char
*type, unsigned char *returnsha1)
The only change is that I assign the result of `freshen_file` to the
`freshened` flag.
I've only ran this with the test case I was using before but it looks
like this is pretty much fixing the merge time changes we observed.
Thanks again for the swift response. I've got my test setup sitting
here, happy to rerun the tests if that'd be useful.
Is there a chance to backport those changes to the 2.2+ branches?
> You may also be interested in:
>
> http://thread.gmane.org/gmane.comp.version-control.git/266370
>
> which addresses another performance problem related to the
> freshen/recent code in v2.2.
Thanks for the pointer, I'll have a look at that as well.
Cheers,
Stefan
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