Re: [AMaViS-user] [OT] Linux and syslogd flushing

Zitat von Paolo Cravero as2594 <pcravero@as2594.net>:

> Hi,
> I am running amavisd-new on a RHEL3 Linux box, and I would like to
> disable syslogd immediate log flushing (as written in the amavis
> tweaking FAQ).
>
> I am afraid this is not a well documented feature of syslogd, and
> I've only found that prepending a dash "-" to the logname should
> activate the delayed disk write:
>
> mail.* -/var/log/maillog
>
> Added and restarted syslogd, but I see no real difference when
> tailing -f the file.
>
> Anyone has more complete information, that could also be added to the
> docs? How often should Linux syslogd then write to disk?

I doubt you could see any effect with tail at all. Prepending the dash
only means "do not fsync the file after every write" with the intention
to let the buffer caches do their job at the risk to loose some events
in case of a crash.
You should see that the CPU and I/O load is reduced if a lot of logging
is going on.

Regards

Andreas




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