[mythtv-users] Multirec performance tests inside

[Ismo Tanskanen]

Am Mittwoch 12.M?rz 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


You are using sasc-ng. How stable is it with trunk?
I have three tuners and only one with Common Interface, so I have been 
thinking sasc-ng.
But I tested it some time ago, and Icould not get it stable enough.

-Kane