Logwatch problem?
Garry T. Williams
gtwilliams at gmail.com
Tue Apr 21 14:47:12 UTC 2009
On Tuesday 21 April 2009 09:28:54 Gene Heskett wrote:
> I noticed my machine was lagging badly, so I took a look with htop,
> and
>
> /usr/bin/perl /usr/share/logwatch/scripts/shared/onlyservice init
>
> is using 99% of a core (4 core machine) and /dev/sda3 is showing
> about a 15Meg/sec continuous read operation. This has been going
> on for at least an hour.
>
> What is it doing?
It's scanning a log file for messages from `init'. I guess you have a
*very* large log file that it is reading. (Take a look at the Perl
script /usr/share/logwatch/scripts/shared/onlyservice . It's just
matching on one of several different Perl regular expressions that
include the string `init'.)
I see that the Perl regular expressions are suboptimal in that the
quantifier `*' seems to be used in several places where it should be
`+'. This consumes more CPU than necessary.
> And why?
Because the logwatch program runs periodically to summarize
"interesting" log messages.
--
Garry T. Williams --- +1 678 656-4579
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