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From Nikolay Kоvshov <nkovs...@yandex.ru>
Subject Re: Cassandra 1.0 hangs during GC
Date Wed, 01 Aug 2012 08:01:59 GMT
And the final solution

http://unbxd.com/blog/2012/07/java-and-ksoftirqd-100-cpu-due-to-leap-second/

Doing $ date -s "`date`" solved the problem. 


30.07.2012, 16:09, "Nikolay Kоvshov" <nkovshov@yandex.ru>:

>  You mean using swap memory? I have total of 48G of RAM and Cassandra never used more
than 2G, swap is disabled.
>
>  But as I have little clues, I can give this a try. Is there any fresh instruction on
running Cassandra with JNA ?
>
>  30.07.2012, 16:01, "Mateusz Korniak" <mateusz-lists@ant.gliwice.pl>:
>>   On Monday 30 of July 2012, Nikolay Kоvshov wrote:
>>>    -  JNA is not installed on both machines
>>   So your GC times may be strongly [1] affected by swapping.
>>   IIRC, also snapshotting is more expensive and may trigger more swapping.
>>   I would start with turning JNA mlockall on [2].
>>
>>   [1]:
>>   Not sure if up to numbers you presented ( many seconds)...
>>
>>   [2]:
>>   INFO [main] 2012-07-27 12:18:27,135 CLibrary.java (line 109) JNA mlockall
>>   successful
>>
>>   --
>>   Mateusz Korniak

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