Skip site navigation (1) Skip section navigation (2)

Re: User concurrency thresholding: where do I look?

From: "Jignesh K(dot) Shah" <J(dot)K(dot)Shah(at)Sun(dot)COM>
To: josh(at)agliodbs(dot)com
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: User concurrency thresholding: where do I look?
Date: 2007-07-31 21:46:26
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Yep quite a bit of transactions .. But the piece that's slow is where it 
is clearing it up in CommitTransaction().
I am not sure of how ProcArrayLock is designed to work and hence not 
clear what  we are seeing is what we expect.

Do we have some design doc on ProcArrayLock to understand its purpose?


Josh Berkus wrote:
> Simon,
>> Well thats pretty weird. That code path clearly only happens once per
>> transaction and ought to be fast. The other code paths that take
>> ProcArrayLock like TransactionIdIsInProgress() and GetSnapshotData()
>> ought to spend more time holding the lock. Presumably you are running
>> with a fair number of SERIALIZABLE transactions?
> Given that this is TPCC-analog, I'd assume that we are.
> Jignesh?

In response to

pgsql-performance by date

Next:From: DimitriDate: 2007-07-31 22:14:53
Subject: Re: Postgres configuration for 64 CPUs, 128 GB RAM...
Previous:From: Josh BerkusDate: 2007-07-31 21:33:20
Subject: Re: User concurrency thresholding: where do I look?

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group