Large number of mogstored processes

[mischa.z]

But why processes? Why not using threads? (Sorry if I ask dumb questions 
but my knowledge of Perl is rather limited:/). Altogether those 
processes use up a substantial amount of memory without actually doing 
anything (at that time there weren't any PUT requests + GET is handled 
by lighttpd). And what really strikes me is that I see a lot of child 
processes on only 2 out of 5 nodes.
e.g. another node that seems to be Ok:
ps -ef | grep mog
root      9673     1  0 Feb21 ?        00:00:00 /usr/bin/perl 
/usr/bin/mogstored --daemon
root      9674  9673  2 Feb21 ?        00:31:55 /usr/bin/perl 
/usr/bin/mogstored --daemon
root      9675  9674  0 Feb21 ?        00:00:48 mogstored [diskusage]
root      9677  9674  0 Feb21 ?        00:00:23 mogstored [iostat]

Cheers.

Brad Fitzpatrick wrote:
> Run ps with the 'f' option.  You'll see they're child processes used for
> disk AIO.  (IO::AIO or Linux::AIO)
> 
> On Thu, 22 Feb 2007, mischa.z wrote:
> 
>> Hi,
>>
>> some of our storage nodes (we are using lighttpd for GET) show a large
>> number of mogstored processes (right after start-up) just sitting there.
>> This only happens on nodes with use > 90% - might be a coincidence?
>> Is this normal behaviour or is something going wrong here?
>>
>> Thanks,
>> Mischa
>>
>> svn740
>>
>> ps aux | grep mogstored | wc -l
>> 105
>>
>> ps aux | grep mogstored
>> root      1573  1.6  0.4 46864 16436 ?       S    11:32   1:02
>> /usr/bin/perl /usr/bin/mogstored --daemon
>> root      1574  0.0  0.4 46864 16436 ?       S    11:32   0:00
>> /usr/bin/perl /usr/bin/mogstored --daemon
>> root      1575  0.0  0.4 46864 16436 ?       S    11:32   0:00
>> /usr/bin/perl /usr/bin/mogstored --daemon
>> root      1576  0.0  0.4 46864 16436 ?       S    11:32   0:00
>> /usr/bin/perl /usr/bin/mogstored --daemon
>> ...
>>
>>
>>
>