Messages in this thread | | | Date | Mon, 15 Nov 2004 09:39:20 +0200 | From | Lenar Lõhmus <> | Subject | Re: 2.6.9: unkillable processes during heavy IO |
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I had similar hanging with mysql on 64bit_debian@A64 3500+ + mysql 4.1.5. 1GB memory.
After digging around I added "skip-concurrent-insert" to mysql conf and those hangs disappeared. It might be mysql problem (not kernel) on 64bit linux.
Although my mysql processess where killable with -9.
Lenar
Brad Fitzpatrick wrote:
>We have two database servers which freeze up during heavy IO load. The >machines themselves are responsible, but the mysqld processes are forever >locked, unkillable with even kill -9. I can't restart with MySQL without >rebooting the machines. > >I can reasonable rule out hardware, since this is happening in the >same way on two identical machines. > >I'd like to know how I can debug this, to file a proper bug report. > >The hardware/software stack is: > > - Dual Opteron 246, SMP kernel, w/ NUMA > - 9 GB of memory (4GB in one zone, 5GB in the other) > - MySQL, running mostly InnoDB, but some MyISAM > - MegaRAID raid-10 > - device mapper > - XFS (used as both O_DIRECT from InnoDB and regularly from MyISAM) > >At this point I'm going to try changing different variables on >different machines in order to try and isolate it, but it's a slow >process. > > - on raw partions, instead of device mapper > - ext3 instead of XFS > - not using O_DIRECT > >
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