[ale] Long lag for command line

[Doug Hall]

Excellent! Well done, Alex. That was a tricky one.


On Mon, Jul 8, 2013 at 7:17 PM, Wolf Halton <wolf.halton at gmail.com> wrote:

> Thanks for that update. Nice to know.
>
> Wolf Halton
> --
> http://wolfhalton.info
> Apache developer:
> wolfhalton at apache.org
> On Jul 7, 2013 2:30 PM, "Alex Carver" <agcarver+ale at acarver.net> wrote:
>
>> I think I may have figured out the lag problem.  ClamAV was still running
>> its default config which updates every hour (!).  I don't even scan once a
>> week so I certainly don't need an update every hour. However, it's not
>> smart enough to abort quickly if there's an I/O issue (like a slow mirror)
>> so it just hangs on.
>>
>> At the same time integrit and rkhunter both take off running (integrit
>> once per night and rkhunter once per week).  Both of them were scanning
>> clamav's files while clamav had them open to update.  To top that off would
>> be all the other disk I/O going on at various times (mysql actively
>> handling data requests, me fiddling around at the command line, SMART
>> probing the disks, other cron jobs, etc.)
>>
>> So one big I/O collision later, nothing runs properly.  As soon as I
>> killed off clamav's freshclam updater, though, everything took off like
>> normal and all the delays went away.  So freshclam seems to be the main
>> culprit.
>>
>> I'm still going to keep an eye on it but for now I killed freshclam's
>> daemon mode and put a script into cron.weekly so that it only updates once
>> per week.  I also have rkhunter and integrit avoiding the clamav databases
>> so I think it'll finally behave.
>>
>> On 7/2/2013 12:19, Alex Carver wrote:
>>
>>> Ok, so it hung up again.  I've got a good strace and a bad strace for
>>> starting up vi.  The good strace shows the whole trace taking about
>>> three seconds.  The bad strace shows the whole trace taking 20 seconds.
>>>
>>
>>
>> ______________________________**_________________
>> Ale mailing list
>> Ale at ale.org
>> http://mail.ale.org/mailman/**listinfo/ale<http://mail.ale.org/mailman/listinfo/ale>
>> See JOBS, ANNOUNCE and SCHOOLS lists at
>> http://mail.ale.org/mailman/**listinfo<http://mail.ale.org/mailman/listinfo>
>>
>
> _______________________________________________
> Ale mailing list
> Ale at ale.org
> http://mail.ale.org/mailman/listinfo/ale
> See JOBS, ANNOUNCE and SCHOOLS lists at
> http://mail.ale.org/mailman/listinfo
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.ale.org/pipermail/ale/attachments/20130708/98babc01/attachment.html>