[mythtv-users] Multirec performance tests inside

Florian Bittner flo at flobittner.de
Wed Mar 12 21:50:14 UTC 2008


Am Mittwoch 12.März 2008 22:04:42 schrieb 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
> >
> >  _______________________________________________
> >  mythtv-users mailing list
> >  mythtv-users
> >  http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
> 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
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I had no problems with latest svn so far. Just find the right repository, it 
changes often and then you probably won't get the newest (and most stable and 
supporting multirec) version. Have a look here: http://www.dvbn.happysat.org/ 
in the Linux DVB-Sat-TV forum.

Flo


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