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Hello Folks,
Problem: my customized usb live install of Slitaz 3.0, built from ISO with addition programs installed, is not releasing cached memory. Main symptom is Firefox crashes with OOM condition even though there some 600M of available cached memory at the time.
The Live USB boot setup was built with TAZUSB, with my rootfs.gz amounting to about 220MB. "/home" is mounted directed to the USB stick.
Oddly, when I try issuing either sync or "echo 3 > /proc/sys/vm/drop_caches" (or both commands) there is no change to the cached memory reported by "top." I can't put my finger on where meminfo is, but my memory stats are (at this moment):
Top:
Mem: 846060K used, 179268K free, 0K shrd, 1712K buff, 649172K cached
Free (note that busybox version doesn't support -m flag):
root@slitaz:/proc/sys/vm# free
total used free shared buffers
Mem: 1025328 890164 135164 0 1712
Swap: 0 0 0
Total: 1025328 890164 135164
As of this writing, I'm running Firefox, but if I continue working as I normally do, soon enough I'll have additional windows open and trigger an OOM KILL of Firefox, even though plenty of memory cache is available.
I'm thinking if most of my filesystem is running from RAM disk, the memory cache isn't doing me any good for those files. My /home is mounted directly to /dev/sdb1 (my booted USB stick) so the caching would help there, I suppose. I guess Firefox'es cached files are under /home and therefore are cached?
Any suggestions? System has 1MB of RAM but no hard drive installed (mostly because there may be a hardware issue with the built-in IDE controller on this old box -- I kept getting "BUS ERRORS" when trying to run from hard drive so switched to USB, which, apart from this problem, serves me well -- the machine will run stable for days with Slitaz as long as I don't overdo things with Firefox windows).
Thanks!
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Contents of my /proc/meminfo:
root@slitaz:/proc# cat /proc/meminfo
MemTotal: 1025328 kB
MemFree: 110904 kB
Buffers: 1712 kB
Cached: 649512 kB
SwapCached: 0 kB
Active: 191028 kB
Inactive: 1512 kB
Active(anon): 189800 kB
Inactive(anon): 116 kB
Active(file): 1228 kB
Inactive(file): 1396 kB
Unevictable: 647264 kB
Mlocked: 0 kB
HighTotal: 130504 kB
HighFree: 252 kB
LowTotal: 894824 kB
LowFree: 110652 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 188580 kB
Mapped: 35728 kB
Slab: 17920 kB
SReclaimable: 14020 kB
SUnreclaim: 3900 kB
PageTables: 1092 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 512664 kB
Committed_AS: 371988 kB
VmallocTotal: 122880 kB
VmallocUsed: 1764 kB
VmallocChunk: 120308 kB
DirectMap4k: 200696 kB
DirectMap4M: 708608 kB
###
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Now I notice that the above meminfo dump (with Firefox running) shows:
Unevictable: 647264 k
Is this normal usage of RAM after decompressing a rootfs.gz of approx. 250MB (as listed in the file system of the USB stick) and running Slitaz 3.0 stable with X?
Maybe so...assuming that the RAM disk is represented by tempfs, I see about 500MB for the RAM disk:
root@slitaz:/proc# df -h
Filesystem Size Used Available Use% Mounted on
tmpfs 500.6M 4.0k 500.6M 0% /dev/shm
/dev/sdb1 3.7G 574.0M 3.2G 15% /home
Can someone confirm that these numbers make sense and are to be expected?
Thanks!
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[ Generated in 0.017 seconds, 7 queries executed - Memory usage: 1.54 MiB (Peak: 1.77 MiB) ]