Niels Dybdahl wrote:
What's the least memory I can get away with on a slave backend with 2x
DVB tuners? The box will likely be a fanless EPIA 5000, and it won't
be doing anything else at all...... So, it'll only have kernel, DVB
drivers, network (inc WOL), mythbackend.
Is 32MB sufficient, or do I need 64 (or 128?) My guess is it depends
on how much buffering it's doing... Would be nice to hear form anyone
who's actually tried it!
My Mythbackend (one PVR-250) currently has a VmSize of 176 MB. I would not
put less into the box, so I would go for 256 MB. The backend has to keep
pace with the recording cards, and that can be hard if large parts of the
buffers or code are swapped to disk.
When I was on MythTV 0.14 and 0.16 the system was not stable when I had too
little RAM. I am now using 0.18.1 which seems to be much more stable.
I am running both frontend and backend on the same PC, so I have 512 MB in
my box.
Niels Dybdahl
Normally i run 512Mb i one of my SBE (pvr 250 & pvr 350), but as an
experiment i've put in 256Mb and after a week my 'top' status looks like
this:
Tasks: 59 total, 2 running, 57 sleeping, 0 stopped, 0 zombie
Cpu(s): 4.3% us, 4.0% sy, 0.0% ni, 88.8% id, 0.0% wa, 1.0% hi, 2.0% si
Mem: 254868k total, 250944k used, 3924k free, 868k buffers
Swap: 488556k total, 152k used, 488404k free, 197776k cached
...
9081 mythtv 16 0 119m 18m 10m S 0.0 7.3 0:11.65 mythbackend
....
It's a minimal configuration (no X running), it is just running
sshd,ntpd,mythbackend and syslog-ng.
So, yes. I would say that 256Mb is needed for a smooth operation.
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