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Big increase in memcached CPU usage after Dec 14 Microsoft patches

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Thu, 12/16/2010 - 04:49
thomaspetersen
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After applying the patches released by Microsoft on Dec 14 2010 we have seen a big increase in the CPU usage of memcached. We used to see virtually no CPU usage from memcached, but are now seeing it pegged on ~6% on each cluster node, and if the number of ops/sec rises we see the CPU usage rise in proportion. We were able to determine with a high degree of confidence that the increase in CPU usage correlated with the installation of the Microsoft patches and not with some other configuation change.


We are running Membase 1.6.0 in a 2-node cluster on Windows 2008 64-bit. There are no firewalls between the nodes. We don't see moxi or erl.exe use any CPU -- only memcached.exe displays unexpected behavior.


The patches we installed were:
KB2388210
KB2423089
KB2296199
KB2305420
KB2416400
KB2436673
KB2442962
KB973687
KB2388210
KB2447568
KB2467659


Does anybody else have good or bad experiences with the latest batch of patches from Micrsoft or any insight into what could be going on?


 


Regards,
Thomas Petersen

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Thu, 12/16/2010 - 17:48
bhawana@membase
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Thomas,

None of our customers have reported increased CPU usage after applying the patches you mention. I will keep an eye for those.

Thanks

Bhawana

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Tue, 01/04/2011 - 11:02
steve
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Joined: 03/15/2010
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Hi,

Wanted to follow up with you on this -- the latest & greatest release (now 1.6.4.1) does have fixes for a 100% cpu bug for the Windows platform, so upgrading from 1.6.0.x is recommended.

Cheers,

Steve

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Thu, 01/06/2011 - 06:45
thomaspetersen
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Joined: 12/16/2010
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Upgrading to 1.6.4.1 did indeed resolve the issue we experienced, and things are back to normal. Thanks for the help.


 


Best,


Thomas

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Thu, 01/06/2011 - 06:47
thomaspetersen
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Joined: 12/16/2010
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Upgrading to 1.6.4.1 did indeed resolve the issue we experienced. Thanks for the help!

 

Best,

Thomas

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Mon, 11/14/2011 - 03:24
bertie8
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Hi,

I have installed membase server 1.7.2r-20-g6604356 onto Win 7 32 bit and seem to be having similar issues (I think since last Windows Update). erl.exe running at 100% CPU. I ended the process and it seems to have re-spawned, with lower CPU but its memory usage keeps growing and growing without the memcache being used at all... any ideas?

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Tue, 11/15/2011 - 10:03
bertie8
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Update: My issue is occuring when the PC resumes from "sleep" mode. CPU off the clock until I end process.

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