Re: Group Commit

> On Mon, 9 Apr 2007, Bruce Momjian wrote:
> 
> > The big question is who is going to care about the milliseconds delay
> > and is using a configuration that is going to benefit from commit_delay.
> 
> I care.  WAL writes are a major bottleneck when many clients are 
> committing near the same time.  Both times I've played with the 
> commit_delay settings I found it improved the peak throughput under load 
> at an acceptable low cost in latency.  I'll try to present some numbers on 
> that when I get time, before you make me cry by taking it away.

Totally agreed here. I experienced throughput improvement by using
commit_delay too. 

> An alternate mechanism that tells the client the commit is done when it 
> hasn't hit disk is of no use for the applications I work with, so I 
> haven't even been paying attention to no-commit-wait.

Agreed too.
--
Tatsuo Ishii
SRA OSS, Inc. Japan