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Subject2.4.13 Mem Related Hangs
We have a 8 CPU/8GB Dell 8450 running 2.4.13 (NFS and XFS patches) which
hangs regularly.

I'd say that the problem is memory related. What seems to occur is that
mem cache grows until physical mem is exhausted at which time the system
hangs.

This is the top screen that printed out seconds before the machine
became unresponsive. I was typing in another window and it stopped
responding but this screen had just updated.


4:13pm up 2 days, 5:55, 5 users, load average: 22.02, 19.27, 19.90
247 processes: 228 sleeping, 19 running, 0 zombie, 0 stopped
CPU0 states: 20.53% user, 79.8% system, 0.0% nice, 0.1% idle
CPU1 states: 5.46% user, 94.16% system, 0.0% nice, 0.1% idle
CPU2 states: 7.37% user, 71.45% system, 0.2% nice, 20.42% idle
CPU3 states: 4.40% user, 95.23% system, 0.0% nice, 0.0% idle
CPU4 states: 8.45% user, 91.18% system, 0.0% nice, 0.0% idle
CPU5 states: 5.38% user, 89.24% system, 0.1% nice, 4.63% idle
CPU6 states: 5.12% user, 87.18% system, 0.0% nice, 7.33% idle
CPU7 states: 6.55% user, 88.41% system, 0.1% nice, 4.29% idle
Mem: 8246096K av, 8233888K used, 12208K free, 0K shrd, 0K
buff
Swap: 8371784K av, 0K used, 8371784K free 7441040K
cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
7516 d0relmgr 14 0 43296 42M 2580 R 58.9 0.5 2:34 kfront
8626 d0relmgr 13 0 29276 28M 2180 R 15.4 0.3 0:48 kfront
8893 d0relmgr 10 0 25732 25M 2180 R 15.7 0.3 0:36 kfront
9241 d0relmgr 10 0 20824 20M 2180 R 15.6 0.2 0:13 kfront
9112 d0relmgr 11 0 20180 19M 2180 R 15.1 0.2 0:17 kfront
9230 d0relmgr 10 0 19596 19M 2180 R 16.0 0.2 0:14 kfront
9448 d0relmgr 12 0 16456 16M 2180 R 17.0 0.1 0:13 kfront
9487 d0relmgr 15 0 14292 13M 2180 D 14.9 0.1 0:13 kfront
9800 d0relmgr 15 0 8744 8744 2160 R 10.7 0.1 0:06 cc1
3408 d0relmgr 9 0 4888 4888 580 S 0.0 0.0 0:03 gmake
27680 d0relmgr 8 0 4380 4380 572 S 0.0 0.0 0:03 gmake
30697 d0relmgr 9 0 4348 4348 568 S 0.0 0.0 0:00 gmake
31964 d0relmgr 9 0 4348 4348 568 S 0.0 0.0 0:00 gmake
30499 d0relmgr 9 0 4344 4344 568 S 0.0 0.0 0:00 gmake
3609 d0relmgr 9 0 3840 3840 580 S 0.0 0.0 0:02 gmake
2987 d0relmgr 9 0 3600 3600 600 S 0.0 0.0 0:02 gmake
911 xfs 9 0 3360 3360 916 S 0.0 0.0 0:00 xfs
9014 d0relmgr 9 0 3360 3356 1772 S 0.0 0.0 0:24 xterm
9757 d0relmgr 13 0 2532 2532 1776 R 17.7 0.0 0:11
kfront-thin
9016 d0relmgr 8 0 2416 2416 984 S 0.0 0.0 0:06 tcsh
22852 d0relmgr 8 0 2052 2052 1132 S 0.0 0.0 0:13 tcsh
9102 boyd 9 0 2000 2000 1128 S 0.1 0.0 0:02 tcsh
572 root 9 0 1988 1988 1728 S 0.0 0.0 12:47 ntpd
850 root 9 0 1968 1968 1424 S 0.0 0.0 0:22 sendmail
8220 boyd 9 0 1924 1924 1064 S 0.0 0.0 0:30 tcsh
8885 d0relmgr 9 0 1808 1808 600 S 0.0 0.0 0:01 gmake
7598 d0relmgr 9 0 1744 1744 600 S 0.0 0.0 0:00 gmake

This is from a few seconds before:

d0lomite 4:13pm ~ 5 > cat /proc/meminfo
total: used: free: shared: buffers: cached:
Mem: 8444002304 8418140160 25862144 0 0 7619543040
Swap: 8572706816 0 8572706816
MemTotal: 8246096 kB
MemFree: 25256 kB
MemShared: 0 kB
Buffers: 0 kB
Cached: 7440960 kB
SwapCached: 0 kB
Active: 5300072 kB
Inactive: 2140888 kB
HighTotal: 7471104 kB
HighFree: 2044 kB
LowTotal: 774992 kB
LowFree: 23212 kB
SwapTotal: 8371784 kB
SwapFree: 8371784 kB


Any assistance or words of wisdom would be appreciated.

Jason Allen





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