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| RAM requirements/frontend and crashing.. http://forum.linhes.org/viewtopic.php?f=6&t=7539 |
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| Author: | declanh [ Tue Dec 27, 2005 4:36 am ] |
| Post subject: | RAM requirements/frontend and crashing.. |
What amount of RAM are most using ? I have 256mb DDR in my mythbox but have suffered from random frontend crashes (esp with the RETRO theme)... was wondering is this likely to be RAM related - anyone think adding another 256mb would make any diff ? I have also discovered i can make the Frontend crash semi reliably (!) by using the visual search (ff/rewind) for a about 15 seconds... is this likely to be memory related ? D |
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| Author: | cesman [ Tue Dec 27, 2005 10:49 am ] |
| Post subject: | |
Boot from the CD using 'memtest' to test your RAM. |
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| Author: | declanh [ Wed Dec 28, 2005 7:17 pm ] |
| Post subject: | |
cesman wrote: Boot from the CD using 'memtest' to test your RAM.
ok will do - i take it that 256mb is adequate then?? Will another 256 make any diff to speed or stability. -- D |
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| Author: | cesman [ Wed Dec 28, 2005 7:43 pm ] |
| Post subject: | |
Yes, 256 is fine. |
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| Author: | nigelpearson [ Fri Dec 30, 2005 4:47 pm ] |
| Post subject: | |
I actually think the RAM depends on what you are doing. On my home box (R4V4, two DVB cards, recording SD, outputting 1280x768) where 32MB is used by the shared video RAM: * 256MB is marginal. Booting the box, top shows: Code: Mem: 223416k total, 213844k used, 9572k free, 8132k buffers Swap: 498004k total, 0k used, 498004k free, 120040k cached Recording two programmes while playing back another recording does: Code: Mem: 223416k total, 222328k used, 1088k free, 1400k buffers
Swap: 498004k total, 8876k used, 489128k free, 108788k cached * Trying to do other stuff, like using the mythburn scripts to master DVDs, results in paging/swapping, and some skipping of playback. Bumping the RAM up to 512MB eliminates this problem |
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| Author: | no2u [ Fri Feb 03, 2006 8:20 am ] |
| Post subject: | |
Speaking of RAM, I started out with 1GB of RAM about a year ago and average memory usage was around 60-70%, but now MythFrontEnd is getting sluggish and I see that my memory usage is always pegged close to 100%. I'm assuming that the memory usage increase over time has something to do with the increasing size of the mythconverg database. "ps v -A" shows memory usage as follows; seems like apache is using quite a bit as well: PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND 2839 ? S 0:06 1 249 140430 4168 0.4 /usr/sbin/apache 2841 ? S 0:01 2 249 155526 16908 1.6 /usr/sbin/apache 2842 ? S 0:03 3 249 152446 13920 1.3 /usr/sbin/apache 2843 ? S 0:00 1 249 140698 4568 0.4 /usr/sbin/apache 2844 ? S 0:06 0 249 154662 16136 1.5 /usr/sbin/apache 2845 ? S 0:00 14 249 140562 4484 0.4 /usr/sbin/apache 3643 ? S 0:00 0 628 2003 1272 0.1 /bin/sh /usr/bin/mysqld_safe 3679 ? S<l 13:32 42 3811 65812 28360 2.7 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock 3680 ? S 0:00 0 5 1562 504 0.0 logger -p daemon.err -t mysqld_safe -i -t mysqld 3715 ? Ss 0:00 0 274 3269 1508 0.1 /usr/sbin/sshd 3723 ? Ssl 135:39 27 511 216684 30040 2.9 /usr/bin/mythbackend --daemon --logfile /var/log/mythtv/mythbackend.log --pidfile /var/run/mythtv/mythbackend.pid 4164 ? Ss 0:00 1 994 7477 6380 0.6 /usr/bin/perl /usr/share/webmin/miniserv.pl /etc/webmin/miniserv.conf 4901 ? Ss 0:00 0 249 8746 2320 0.2 /usr/bin/gdm 4913 tty2 Ss+ 0:00 0 10 5279 ? S 0:00 3 249 140722 4544 0.4 /usr/sbin/apache 6099 ? S 0:03 28 249 156450 17968 1.7 /usr/sbin/apache 8393 ? S 0:00 2 50 3737 2216 0.2 /usr/lib/gconf2/gconfd-2 9 12838 ? S 0:05 0 249 154870 16340 1.5 /usr/sbin/apache 12839 ? S 0:01 1 249 149334 10792 1.0 /usr/sbin/apache 12840 ? S 0:00 0 249 140562 4272 0.4 /usr/sbin/apache 14858 tty1 Ss+ 0:00 1 10 1569 488 0.0 /sbin/getty 38400 tty1 14865 ? S 0:00 1 249 9082 2740 0.2 /usr/bin/gdm 14874 ? SL 0:18 10 1508 194195 60832 5.8 /usr/X11R6/bin/X :0 -audit 0 -auth /var/lib/gdm/:0.Xauth -nolisten tcp vt7 14916 ? Ss 0:00 4 1014 7381 4088 0.3 x-window-manager 14956 ? Ss 0:00 0 53 3018 920 0.0 /usr/bin/ssh-agent x-window-manager 14958 ? Ssl 0:03 45 1025 145263 81360 7.8 mythfrontend 15049 ? Sl 0:19 110 13800 77643 29256 2.8 (Ignore Firefox which is listed cuz that's what I'm using to enter this post:) /usr/lib/mozilla-firefox/firefox-bin -a firefox -z 95 http://www.mysettopbox.tv 15076 ? Ss 0:00 0 228 5251 2648 0.2 xterm 15077 ttyp0 Ss 0:00 1 628 2067 1440 0.1 sh 15082 ttyp0 R+ 0:00 0 63 2312 704 0.0 ps v -A Looks like I'm going to have to bump it up to 1.5 or 2GB unless somebody has some ideas... (It probably doesn't help that I have about 200 channels and 3 tuner cards plus Firewire.) Thanks! |
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| Author: | tjc [ Fri Feb 03, 2006 8:50 pm ] |
| Post subject: | |
I've used 512Mb from day one and always found that to be plenty. The only thing where you might want more is very demanding HDTV. Many folks do fine with 256Mb |
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| Author: | no2u [ Sat Feb 04, 2006 7:42 pm ] |
| Post subject: | |
I'm far from a linux expert, but from the output below I am assuming that most of my 1GB is being used by the file system cache, and any sluggishness that I'm recently experiencing in MythFrontEnd is probably due to the inability to fit "everything" in cache. I mean I guess it's good that there's not more "free" memory since "free" memory is memory that's being wasted, right? > free -l total used free shared buffers cached Mem: 1034132 997472 36660 0 4480 646940 Low: 903124 866604 36520 High: 131008 130868 140 -/+ buffers/cache: 346052 688080 Swap: 594396 8 594388 > cat /proc/meminfo MemTotal: 1034132 kB MemFree: 14076 kB Buffers: 55716 kB Cached: 606792 kB SwapCached: 0 kB Active: 626328 kB Inactive: 316616 kB HighTotal: 131008 kB HighFree: 140 kB LowTotal: 903124 kB LowFree: 13936 kB SwapTotal: 594396 kB SwapFree: 594388 kB Dirty: 228 kB Writeback: 0 kB Mapped: 312676 kB Slab: 52232 kB CommitLimit: 1111460 kB Committed_AS: 613768 kB PageTables: 1596 kB VmallocTotal: 114680 kB VmallocUsed: 80284 kB VmallocChunk: 30708 kB HugePages_Total: 0 HugePages_Free: 0 Hugepagesize: 4096 kB |
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| Author: | tjc [ Sat Feb 04, 2006 10:23 pm ] |
| Post subject: | |
Linux has generally tried to maximize it's memory usage. As a result, unless a box has recently been rebooted, you should expect to see most of the memory in use. Much of it is volatile disk buffers however and not stuff that is going to get swapped if something else comes along. |
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