From: Jim Nasby <jnasby@enova.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Merlin Moncure <mmoncure@gmail.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Problems with hash join over nested loop
Date: Wed, 30 Oct 2013 17:32:06 -0500
Message-ID: <527188E6.2030209@enova.com> (raw)
In-Reply-To: <527187ED.1000907@enova.com>
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On 10/30/13 5:27 PM, Jim Nasby wrote:
> On 10/29/13 3:36 PM, Tom Lane wrote:
>> Jim Nasby <jnasby@enova.com> writes:
>>> Is there a way to measure memory consumption during planning, short of something like strace? (I've got no dev tools available on our servers.)
>>
>> Nothing built-in, I'm pretty sure. You could probably add some
>> instrumentation, but that would require running modified executables ...
>
> FYI, client_min_messages = debug5 and log_planner_stats = on is useful, though I wish it included ru_maxrss (see http://www.gnu.org/software/libc/manual/html_node/Resource-Usage.html).
Oh, and in my 28 table case ru_minflt was 428 4k memory pages (1.7MB). Not a great measurement, but better than nothing. I didn't detect anything noticeable on vmstat either, so I don't think the consumption is huge (an email in the older thread mentioned 1GB... I'm not seeing that).
--
Jim Nasby, Lead Data Architect (512) 569-9461
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To: pgsql-performance@postgresql.org
Cc: jnasby@enova.com, tgl@sss.pgh.pa.us, mmoncure@gmail.com
Subject: Re: Problems with hash join over nested loop
In-Reply-To: <527188E6.2030209@enova.com>
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