On September 26, 2001 02:44 pm, Bill Bradford wrote:
> On Wed, Sep 26, 2001 at 05:14:15PM -0400, Wietse Venema wrote:
> > 0 - In the /etc/syslog.conf file, put a - in front of the maillog
> > filename, so that the stupid syslogd does not hammer the disk
> > after writing each logfile record.
>
> What exactly does this do, and is it OS-specific?

On virtually all unices, syslog wants to sync the disk each time it writes a
single record. If you're getting a huge amount of them, your system can
spend an obscene amount of time syncing to disk over and over.

The - tells it to be less rigorous about syncing, instead it'll cache them
for a while, then dump them all to disk in one shot. I recall massive
performance improvements on an old AViiON 3000 (or similar) 33 MHz box.

Just keep in mind that this means you could/will lose log data on those files
if the power suddenly drops out.
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