[mythtv] mythjobqueue and mythbackend on the same system Was: Ticket #3317: mythbackend memory leak

Kevin Kuphal kuphal at dls.net
Mon May 7 19:38:53 UTC 2007

Carl Fongheiser wrote:
> On 5/7/07, *Kevin Kuphal* <kuphal at dls.net <mailto:kuphal at dls.net>> wrote:
>     I didn't find anything generic about a fork error with memory
>     allocation.  Is there additional information I can provide to diagnose
>     this?  My top shows:
>     top - 08:56:07 up 6 days, 42 min,  3 users,  load average: 0.10,
>     0.13, 0.09
>     Tasks:  97 total,   3 running,  94 sleeping,   0 stopped,   0 zombie
>     Cpu(s):  1.0%us,  3.0%sy,  0.0%ni, 90.4%id,  4.0%wa,  0.0%hi,  1.7%si,
>     0.0%st
>     Mem:    775856k total,   767484k used,     8372k free,      108k
>     buffers
>     Swap:   524280k total,   240864k used,   283416k free,   175920k
>     cached
>     with the backend process
>     31439 root      18   0  987m 499m  12m S  3.3 65.9  45:08.63
>     mythbackend
> Your machine is seriously short on swap space.  A good rule of thumb 
> is to allocate about 2x the amount of physical RAM for swap space.  As 
> to why you're getting a fork() error, fork() will attempt to clone the 
> entire address space.  In this case, that's 987MB worth.  Not all of 
> that will need to be backed by swap, but most of it will.  Since 
> you've only got 280 MB free, the fork() fails.
In regards to this, if I ran mythjobqueue on my system it should have a 
far less intrusive memory footprint than the backend process itself.  Is 
it possible to run mythjobqueue on the same system and mythbackend?


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