[mythtv-users] Multirec performance tests inside

Florian Bittner flo at flobittner.de
Wed Mar 12 15:27:07 UTC 2008


Am Mittwoch 12.März 2008 12:28:49 schrieb Florian Bittner:
> Hi,
>
> after upgrading to 0.21 i wondered how many recordings per card i should
> allow. So i did some tests and perhaps someone else is interested in so i
> post them here.
>
> Backend specs:
>
> AMD64 3500+, 2GB RAM, 4x500GB S-ATA with linux (software) raid 5 and LVM.
> OS is opensuse 10.2. Some other services are running on this machine, e.g.
> fetchmail, exim, clamav, spamassassin, imapd, nagios.
> 3 DVB-S cards (hauppauge nova-se2) have 3 max recordings each.
>
> Test setting:
>
> 9 recordings (6 freetv + 3 paytv) + mythcommflag (on 1 recording) + 1
> recording streamed to frontend
>
> Result:
>
> CPU load: 60-80% (md1_raid5 < 3%, commflag 10-30%, mythbackend < 5 %,
> sasc-ng 20-40%)
> I/O load: top shows wa at 15-30%
> Mem usage: myth 20%, sasc 10%, mysql 5%
>
> I haven't recognized any stutter in playback or in the recordings (i
> randomly watch pieces), so that the setting is stable for production use
> :-)
>
> I do another test with max recordings per card set to 5 later.
>
> Greetings,
> Flo
>
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Surprisingly 15 recordings  (10 paytv + 5 freetv) + mythcommflag ( 1 rec) + 1 
frontend watching a recording work perfectly, too. The values are almost the 
same. And no stutter.

But don't start 15 recordings at the same time, mythbackend crashed :-) But 
after a restart it started 14 rec instantly, only 1 got lost.

Greetings,
Flo


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