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Posted to user@couchdb.apache.org by evgeny_n <en...@gmail.com> on 2009/02/18 14:28:18 UTC
Performance
Hello,
i can't understand some thing, please explain me =)
I have writing performance about 30 documents per second.
Two machines:
one is CouchDB server with already created db (~1M documents);
another - i wrote test program (Java + jcouchdb) that sends documents (~ 1Kb
each) to server db.
Best result that I get is about 30 sends per second! Why so slow?
Performance monitor on server shows that CPU is 40% all time (Disk and
Network is 30-40% too). On test machine - there is no full CPU activity too.
On both machines: Windows XP SP2.
Thank you, very much!
Re: Performance
Posted by Ulises <ul...@gmail.com>.
> version of couch? if you're not running trunk, you really ought to
> version of erlang? you should be near the tip here too, i believe
Moreover, bulk uploads or single doc uploads? That makes a big difference.
U
Re: Performance
Posted by Dean Landolt <de...@deanlandolt.com>.
On Wed, Feb 18, 2009 at 8:28 AM, evgeny_n <en...@gmail.com> wrote:
> Hello,
>
> i can't understand some thing, please explain me =)
>
> I have writing performance about 30 documents per second.
>
> Two machines:
> one is CouchDB server with already created db (~1M documents);
> another - i wrote test program (Java + jcouchdb) that sends documents (~
> 1Kb
> each) to server db.
>
> Best result that I get is about 30 sends per second! Why so slow?
> Performance monitor on server shows that CPU is 40% all time (Disk and
> Network is 30-40% too). On test machine - there is no full CPU activity
> too.
>
> On both machines: Windows XP SP2.
>
> Thank you, very much!
version of couch? if you're not running trunk, you really ought to
version of erlang? you should be near the tip here too, i believe
Re: Performance
Posted by Jens Alfke <je...@mooseyard.com>.
On Feb 18, 2009, at 5:28 AM, evgeny_n wrote:
> i can't understand some thing, please explain me =)
> I have writing performance about 30 documents per second.
If you're writing documents in individual transactions, that's around
what I would expect. I'm not experienced with CouchDB, but I've done a
lot of work with sqlite, which is similar in that it's a local
filesystem-based database. Transactions are expensive because each one
requires updating the file and flushing the filesystem changes to disk
(the latter cost can be very significant.)
> Best result that I get is about 30 sends per second! Why so slow?
> Performance monitor on server shows that CPU is 40% all time (Disk and
> Network is 30-40% too). On test machine - there is no full CPU
> activity too.
You could try to get some more detailed statistics...
How does the CPU usage break down by process? (If there are view
updates going on, the map and reduce functions will be running in
external spidermonkey processes, if I understand the architecture
correctly.)
I'm not a Windows user, but does it have facilities that let you do
runtime profiling of processes? (I'm thinking of the 'sample' tool on
Mac OS X, which is an essential tool for diagnosing where a process is
spending its time.)
Can you log the filesystem calls (again, the tool I would use on my
platform is fs_usage.)
—Jens