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Re: cannot detect too many clients

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: cannot detect too many clients
Date: 2001-09-06 03:05:21
Message-ID: 29257.999745521@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
I wrote:
> Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp> writes:
>> I have a fatal error message while connecting more than 32 users using
>> current:
>> Aug 29 11:25:18 srapc1474 postgres[12189]: [1] FATAL 1:
>> ProcGetNewSemIdAndNum: cannot allocate a free semaphore
>> rather than a more informative message:
>> Sorry, too many clients already
>> Does anynbody know what's happening?

> Ugh.  I thought I'd tested that.

Indeed I had, but I'd used a low value of MaxBackends to test it.
If MaxBackends is a multiple of PROC_NSEMS_PER_SET (16) then too-many-
backends will be detected here, not later on when we try to insert our
PROC entry into the sinval array.  Whoops.  Fix committed.

			regards, tom lane

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