[mythtv-users] minimum memory on backend?

[Bob]

E Norm One wrote:

> 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.

Usually the kernel doesn't page infrequently used memory blocks unless 
it's running out so memory consumption will creep up to near 100% and 
stay there while swap is sparsely used if at all, mem used is not an 
indication of whether you have enough RAM but swap utilisation is.

top - 13:38:48 up 1 day,  5:45,  4 users,  load average: 1.51,1.26,0.95
Tasks:  67 total,   2 running,  65 sleeping,   0 stopped,   0 zombie
Cpu(s): 41.5% us, 1.9% sy, 0.0% ni, 55.7% id ,0.0% wa, 0.9% hi, 0.0% si
Mem:    774056k total,   766004k used,     8052k free,     2372k buffers
Swap:   337356k total,        0k used,   337356k free,   488536k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
3465 mythtv    15   0  226m  74m  14m S 43.5  9.9 567:44.48 mythbackend
4192 root      16   0  114m  47m 2996 S  0.0  6.3   2:15.28 XFree86
4794 mythtv    16   0  139m  41m  16m S  0.0  5.4   3:55.95 mythfrontend
3426 mysql     11  -5 67988  29m 3116 S  0.0  3.9   1:34.59 mysqld
2879 www-data  16   0  149m  13m 3940 S  0.0  1.8   0:22.77 apache
4392 www-data  15   0  149m  13m 3940 S  0.0  1.8   0:17.28 apache
4390 www-data  16   0  148m  12m 3940 S  0.0  1.7   0:15.40 apache
2878 www-data  16   0  148m  12m 3936 S  0.0  1.7   0:19.40 apache
2874 www-data  15   0  148m  12m 3944 S  0.0  1.7   0:17.44 apache
4391 www-data  16   0  148m  12m 3944 S  0.0  1.7   0:25.50 apache
2876 www-data  16   0  147m  12m 3940 S  0.0  1.6   0:21.18 apache
2877 www-data  15   0  147m  11m 3944 S  0.0  1.5   0:20.68 apache
2873 root      16   0  137m 4228 3224 S  0.0  0.5   0:01.74 apache


-- 
tveeprom: Hauppauge: model = 34132, rev = J158,
tveeprom: tuner = Philips FM1236 MK3 (idx = 58, type = 4)
tveeprom: audio_processor = MSP3416 (type = 14)
(new type Model 401)
model name      : mobile AMD Athlon(tm) XP Processor
cpu MHz         : 2277.214
cache size      : 512 KB
(Plenty o' grunt on an ECS k7s5a MB)
Knoppmyth R5A16 (unmodified)
http://mysettopbox.tv/CHANGELOG.txt
MythTV 0.18.1