From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | vadim(at)sable(dot)krasnoyarsk(dot)su (Vadim B(dot) Mikheev) |
Cc: | hackers(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] some problems with new locking code |
Date: | 1998-02-24 19:56:58 |
Message-ID: | 199802241956.OAA14773@candle.pha.pa.us |
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Lists: | pgsql-hackers |
>
> I created simple table (just single int4 attr) with index on it
> and tried to reproduce reported problems with BTP_CHAIN flag
> (without success, unfortunately ?) by inserting data by 3-4 psql-s
> simultaneously. No problems with 2 clients. But when 3rd psql
> starts one of psql-s becomes blocked for long time (a minutes).
> After some time blocked process may continue insertion but
> another process is sleeping instead of wake-uped proc. The same
> with 4 psql-s: one of process is always sleeping!
Thanks for finding this, Vadim. I had meant to re-run my locking tests
on the new code before the 6.3 final, but had not done it yet. I ran
them now, and they didn't work as they should. It is fixed now.
The problem was that I was incrementing a counter in a while conditional
test, even though I was not executing the loop, and the counter was used
in the next loop.
--
Bruce Momjian | 830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us | Drexel Hill, Pennsylvania 19026
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