Quoting Guy <bugzilla@xxxxxxxxxxxxxxxx>:
Run "ipcs" to see if you have shared memory usage that seems wrong, or grows. # ipcs -m
------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 65536 root 600 33554432 11 dest 0x0052e2c1 98305 postgres 600 10330112 11
I have none, but I don't have a database. Databases I have used on other systems tend to use a lot of shared memory. Also, if you were really out of memory, you would have active swapping.
This has happened before. The computer was thrashing so badly, all I could do was hit ctrl-alt-del and hope it eventually shut down cleanly. Which it did about an hour later.
It is normal for the buffer cache to use most "unused" memory, so it would seem like you have almost none free, but the buffer cache will give up memory when needed. I think you have another problem, not memory related. Also, you can stop mdadm from running. The system will still work, just not monitor the arrays. If you really think it is mdadm related, kill it. Or use "/etc/init.d/mdmonitor stop". At least as a test.
I think mdadm isn't actually running, so it might be the device mapper stuff itself. ps -eaf | grep mdadm shows nothing
Run top, look at this line: Mem: 515296k av, 508128k used, 7168k free, 0k shrd, 128412k buff
From my top: Mem: 773984k total, 765556k used, 8428k free, 65812k buffers Swap: 2755136k total, 0k used, 2755136k free, 526632k cached
I think buff (128412k) is the amount of "unused" memory. But not sure. I never had a memory issue with Linux, so have not researched this. But I have on other Unixes. Guy
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