Memory - Revision history

Franks at 17:33, 9 September 2006

2006-09-09T17:33:05Z

← Older revision		Revision as of 10:33, 9 September 2006
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			== Testing RAM for errors ==

			Memtest86 is thorough, stand alone memory test for x86 architecture computers. It is offered in a [[ISO]] image, so that you can put the image on bootable CD.

			[http://www.memtest86.com/#download0 download memtest]

	== Debugging memory hogs in [[BSD]] ==		== Debugging memory hogs in [[BSD]] ==

Frankk at 19:38, 27 October 2005

2005-10-27T19:38:52Z

← Older revision		Revision as of 12:38, 27 October 2005
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	Lookup "KEYWORDS" in the ps [[Manual]] for a list of keys you can display.		Lookup "KEYWORDS" in the ps [[Manual]] for a list of keys you can display.

			[[swap]] is also an important part of memory that resides on the disk.
	~~Also don't forget to ensure there is always enough room in your swap:~~
	~~# swapinfo~~
	~~Device 1K-blocks Used Avail Capacity~~
	~~/dev/ad0s1b 105288 68596 36692 65%~~

	~~otherwise you'll start getting errors to syslog, running applications will be killed, and it will create a general~~
	~~mess of things:~~

	~~Oct 27 09:51:38 mail swap_pager_getswapspace(9): failed~~
	~~Oct 27 09:51:38 mail swap_pager_getswapspace(5): failed~~
	~~Oct 27 09:51:38 mail swap_pager_getswapspace(16): failed~~
	~~Oct 27 09:51:40 mail pid 95400 (perl5.8.7), uid 125, was killed: out of swap space~~


	~~If you are running out of swapspace frequently, you can~~ [~~http://www.freebsd.org/handbook/adding-~~swap~~-space.html add a swapfile~~ ]~~very easily~~ on ~~[[FreeBSD]]~~.

Frankk at 16:17, 27 October 2005

2005-10-27T16:17:29Z

← Older revision		Revision as of 09:17, 27 October 2005
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	rss = resident set size		rss = resident set size

			Lookup "KEYWORDS" in the ps [[Manual]] for a list of keys you can display.

Frankk at 16:15, 27 October 2005

2005-10-27T16:15:59Z

New page

== Debugging memory hogs in [[BSD]] ==

To discover which [[process]] is using the most memory percentage wise:

# ps aumx | head
USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
frankk 64873 0.0 7.9 71352 61644 ?? S 11:17PM 20:07.78 /usr/X11R6/lib/firefox/firefox-bin
frankk 607 0.0 7.7 74080 59832 ?? S 4:25PM 6:18.70 /usr/X11R6/lib/thunderbird/thunderbird-bin
frankk 583 0.0 7.0 64728 54568 ?? I 4:25PM 17:46.62 /usr/X11R6/lib/firefox/firefox-bin
root 561 0.8 3.0 152640 23116 v0 R 4:25PM 10:37.38 X :0 -nolisten tcp (Xorg)
frankk 869 0.0 3.7 34332 29036 ?? S 6:10PM 6:13.38 gaim
frankk 611 0.0 1.6 16476 12560 ?? S 4:28PM 1:39.09 xchat
root 678 0.0 0.5 5604 4000 ?? S 4:54PM 0:05.35 xterm (xterm-static)
root 644 0.0 0.5 5512 3916 ?? S 4:35PM 0:14.46 xterm (xterm-static)
root 392 0.0 0.3 3460 2332 ?? Ss 4:24PM 0:01.97 sendmail: accepting connections (sendmail)

Two other columns worth noting:

vsz = virtual size in Kbytes (alias vsize)

rss = resident set size

Also don't forget to ensure there is always enough room in your swap:
# swapinfo
Device 1K-blocks Used Avail Capacity
/dev/ad0s1b 105288 68596 36692 65%

otherwise you'll start getting errors to syslog, running applications will be killed, and it will create a general
mess of things:

Oct 27 09:51:38 mail swap_pager_getswapspace(9): failed
Oct 27 09:51:38 mail swap_pager_getswapspace(5): failed
Oct 27 09:51:38 mail swap_pager_getswapspace(16): failed
Oct 27 09:51:40 mail pid 95400 (perl5.8.7), uid 125, was killed: out of swap space

If you are running out of swapspace frequently, you can [http://www.freebsd.org/handbook/adding-swap-space.html add a swapfile ]very easily on [[FreeBSD]].