Slow Git Operations

[Bruno Araujo]

Im running a stash (2.12) with 240 repositories, and 14 add-ons, and every operation that runs on git is taking, in avarage, 2 to 3 seconds to complete.

[3338ms] - /usr/bin/git cat-file -t refs/heads/master:src/br/com/sipag
[3363ms] - /usr/bin/git ls-tree refs/heads/master:src/br/com/sipag
[3291ms] - /usr/bin/git cat-file -t refs/heads/homologacao:src/br
[3388ms] - /usr/bin/git ls-tree refs/heads/homologacao:src/br
[3505ms] - /usr/bin/git cat-file -t refs/heads/master:src/br/com/sipag
[3097ms] - /usr/bin/git ls-tree refs/heads/master:src/br/com/sipag
[1947ms] - /usr/bin/git rev-list --format=%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 -1 refs/heads/homologacao --
[2475ms] - /usr/bin/git rev-list --format=%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 -1 refs/heads/master --
[2232ms] - /usr/bin/git rev-list --format=%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 --ignore-missing --stdin --
[2314ms] - /usr/bin/git for-each-ref --sort=-committerdate --format=%(refname)%02%(refname:short)%02%(objectname) refs/heads/
[3683ms] - /usr/bin/git for-each-ref --sort=refname --format=%(refname)%02%(refname:short)%02%(objectname) refs/heads/
[3547ms] - /usr/bin/git for-each-ref --sort=refname --format=%(refname)%02%(refname:short)%02%(objectname) refs/heads/
[2149ms] - /usr/bin/git for-each-ref --sort=refname --format=%(refname)%02%(refname:short)%02%(objectname) refs/heads/
[3313ms] - /usr/bin/git diff-tree --always --format=commit %H%n%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 --root --stdin --
[2209ms] - /usr/bin/git for-each-ref --sort=-objecttype --format=%(objecttype)%02%(refname)%02%(refname:short)%02%(objectname)%02%(*objectname) refs/heads/ refs/tags/
[2601ms] - /usr/bin/git rev-list --format=%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 --ignore-missing --stdin --
[2458ms] - /usr/bin/git for-each-ref --sort=-objecttype --format=%(objecttype)%02%(refname)%02%(refname:short)%02%(objectname)%02%(*objectname) refs/heads/ refs/tags/
[2187ms] - /usr/bin/git for-each-ref --sort=-objecttype --format=%(objecttype)%02%(refname)%02%(refname:short)%02%(objectname)%02%(*objectname) refs/heads/ refs/tags/
[2119ms] - /usr/bin/git rev-list --format=%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 --ignore-missing --stdin --
[2951ms] - /usr/bin/git rev-list --format=%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 --ignore-missing --stdin --
[2527ms] - /usr/bin/git diff-tree --always --format=commit %H%n%H%x02%h%x02%P%x02%p%x02%aN%x02%aE%x02%at%n%B%n%x03 --root --stdin --
[2198ms] - /usr/bin/git cat-file -t refs/heads/producao:
[2195ms] - /usr/bin/git ls-tree refs/heads/producao:
[2350ms] - /usr/bin/git cat-file -t refs/heads/producao:
[2709ms] - /usr/bin/git ls-tree refs/heads/producao: -r
[2211ms] - /usr/bin/git cat-file -t refs/heads/producao:
[2332ms] - /usr/bin/git ls-tree refs/heads/producao:
[2301ms] - /usr/bin/git cat-file -t refs/heads/producao:arquivosTeste
[2347ms] - /usr/bin/git ls-tree refs/heads/producao:arquivosTeste

The machine (XEN VM) have 12 core @2.4 Ghz CPU; 6GB of memory allocated to the stash process; 15k rpm disk; git version 1.7.10.4

this is making the site navegation to be very slow, what can i do to speed things up?

[Stefan Saasen · Accepted solution]

Hi Bruno,

As Deric mentioned the git operations do require memory but are off-heap so the JVM memory settings don't apply. 6GB is most likely way to big for the instance, I'd scale it back to the defaults or if you notice memory pressure to say 1.5 GB at most.

How much memory is left on the box?

Cheers,

Stefan

[dericleeyy]

Hi Bruno,

You can refer to this documentation for Scaling Stash. One line to take note in the documentation:

The memory consumption of Git is not managed by the memory settings in setenv.sh or setenv.bat. The Git processes are executed outside of the Java virtual machine, and as a result the JVM memory settings do not apply to Git.

Regards,

Deric