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From Chris Goffinet ...@chrisgoffinet.com>
Subject Re: Cassandra and -XX:+UseLargePages
Date Mon, 17 Jan 2011 01:08:51 GMT
DiskAccessMode mmap
mlockall() used
No row caches
Default keycache
Default memtable thresholds

-Chris

On Jan 16, 2011, at 5:06 PM, Aaron Morton wrote:

> Chris, could you provide some more info on you experience? Were you using mmapped files?
Using row or key caches? What were the memtabe thresholds? Using mlockall() ?
> 
> There are a couple of issues listed in the first paragraphs here that at first glance
may cause issues http://www.oracle.com/technetwork/java/javase/tech/largememory-jsp-137182.html
> 
> cheers
> Aaron
> 
> On 17/01/2011, at 1:45 PM, Chris Goffinet <cg@chrisgoffinet.com> wrote:
> 
>> I've seen about a 13% improvement in practice.
>> 
>> -Chris
>> 
>> On Jan 16, 2011, at 4:01 PM, David Dabbs wrote:
>> 
>>> Hello.
>>> 
>>> Can anyone comment on the performance impact (positive or negative) 
>>> of running Cassandra configured to use large pages under Linux?
>>> Yes, YMMV applies, but I thought I'd ask before enlisting sysadmin Fu, etc.
>>> 
>>> 
>>> Thanks!
>>> 
>>> David
>>> 
>>> 
>> 


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