Issue 1367 wish: benchmark darcs apply

Title wish: benchmark darcs apply
Priority wishlist Status given-up
Milestone Resolved in
Superseder Nosy List darcs-devel, dmitry.kurochkin, kowey, zandr, zooko
Assigned To
Topics Performance

Created on 2009-02-23.19:15:40 by zooko, last changed 2017-07-30.23:55:30 by gh.

msg7347 (view) Author: zooko Date: 2009-02-23.19:15:36
Zandr was setting up a new branch of tahoe for allmydata.com, and he  
did a "darcs push" over ssh from a repository containing the tahoe  
source (http://allmydata.org/source/tahoe/server-hashedformat ) to an  
empty repository.  Time passed, and Zandr and I gave up and assumed  
it was broken, killed it, experimented, experimented some more, and  
finally copied the whole thing over by making a tarball on one side  
and scp'ing it over and untarring it.

Later, I figured out that if we had waited for 37 minutes, it would  
have worked.

I ran "darcs optimize" in the repo, and then the push --all takes  
"only" 17 minutes.

However, 17 minutes is probably about 10 times as slow as competing  
revision control tools.  For comparison the following script takes  
between 60 and 120 seconds:

tar cjf server-hashedformat.tar.b2 server-hashedformat
scp server-hashedformat.tar.bz2 zooko@allmydata.org:
ssh zooko@allmydata.org 'tar xjf server-hashedformat.tar.bz2'

Could we add this repository to the darcs benchmarking zoo and start  
generating automated benchmarks of how long it takes to push all  
these patches into an empty repository?


Tahoe, the Least-Authority Filesystem -- http://allmydata.org
store your data: $10/month -- http://allmydata.com/?tracking=zsig
msg7351 (view) Author: kowey Date: 2009-02-24.11:52:26
Presumably you were trying to do push --all because of other problems with darcs
put?  I recall that darcs put has a bug where it wasn't propagating flags correctly.

We could certainly use more help with benchmarking!  We now have a sort of
benchmarking harness, but we don't have the infrastructure to use it
automatically.  Infrastructure would probably consist of dedicated hardware and
scripts.  Any help would be appreciated.

Note: Thorkil, I'm not benchmarking push --all is exactly the wish we want
msg7352 (view) Author: kowey Date: 2009-02-24.11:53:19
Also it's worth comparing your numbers with the same command on the local hard disk.
msg7355 (view) Author: zooko Date: 2009-02-24.18:58:09
Right -- issue1255 is why I didn't suggest that Zandr try "darcs put".

A "darcs push -a ../targetemptyrepo" takes 7m28s.  (Cache is enabled.)

Memory usage gets very large during these experiments -- more than 1 GB.
msg7356 (view) Author: kowey Date: 2009-02-24.19:09:28
Summing up for anybody following this:

- original push time (remote): 37 min
- optimized push time (remote): 17 min
- optimized (?) push time (local): 7 min
msg7357 (view) Author: zooko Date: 2009-02-24.22:21:08
Yes the local push was optimized.

And, to sum up for anybody following this:

- suggested target for excellent performance improvement: 120 sec

msg8321 (view) Author: kowey Date: 2009-08-21.17:40:15
Benchmarking push --all is probably a little silly, but it would make sense to
benchmark darcs apply.

- lots of patches
- one big named patch (with lots of pieces?)
Date User Action Args
2009-02-23 19:15:40zookocreate
2009-02-24 11:52:32koweysetstatus: unread -> unknown
priority: wishlist
title: darcs push --all" takes 37 minutes -> wish: benchmark darcs push --all
nosy: kowey, zooko, simon, thorkilnaur, dmitry.kurochkin, zandr
messages: + msg7351
topic: + Performance
2009-02-24 11:53:21koweysetnosy: kowey, zooko, simon, thorkilnaur, dmitry.kurochkin, zandr
messages: + msg7352
2009-02-24 18:58:11zookosetnosy: kowey, zooko, simon, thorkilnaur, dmitry.kurochkin, zandr
messages: + msg7355
2009-02-24 19:09:30koweysetnosy: kowey, zooko, simon, thorkilnaur, dmitry.kurochkin, zandr
messages: + msg7356
2009-02-24 22:21:13zookosetnosy: kowey, zooko, simon, thorkilnaur, dmitry.kurochkin, zandr
messages: + msg7357
2009-08-21 17:40:17koweysetstatus: unknown -> needs-implementation
nosy: kowey, zooko, simon, thorkilnaur, dmitry.kurochkin, zandr
messages: + msg8321
title: wish: benchmark darcs push --all -> wish: benchmark darcs apply
2009-08-25 17:41:13adminsetnosy: + darcs-devel, - simon
2009-08-27 14:28:51adminsetnosy: kowey, darcs-devel, zooko, thorkilnaur, dmitry.kurochkin, zandr
2010-04-04 19:09:31koweysetnosy: - thorkilnaur
2017-07-30 23:55:30ghsetstatus: needs-implementation -> given-up