| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
| Cc: | Martijn van Oosterhout <kleptog(at)svana(dot)org>, Benjamin Arai <barai(at)cs(dot)ucr(dot)edu>, pgsql-admin(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: [GENERAL] Running with fsync=off |
| Date: | 2005-12-27 22:44:10 |
| Message-ID: | 4550.1135723450@sss.pgh.pa.us |
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| Lists: | pgsql-admin pgsql-general |
"Jim C. Nasby" <jnasby(at)pervasive(dot)com> writes:
> How would sync<RETURN>sync<RETURN> differ from sync;sync? The second
> case will wait for the first command to return, or is there a race
> condition that's reduced by typing by hand?
The actual runtime of the "sync" program is epsilon, because it doesn't
wait for all the I/O to happen. The entire reason for the custom is
that the I/O is going on while you type the second "sync". And yes,
it's a race condition.
regards, tom lane
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