[xep-support] Performance and synchronization

[David Tolpin]

On 22.04.2005, at 17:47, Irving Salisbury III wrote:

> I didn't do that measurement, but I did start running multiple vms and 
> have written a load balancer specific to my application.  So, I'll 
> know more in about 4 hours after we run some performance testing on 
> the server.  We did some preliminary performance testing and running 
> multiple vms instead of multiple threads makes XEP scale vs the 
> contention we were seeing inside one VM.
>

Irv,

I've found a four-processor machine for testing, but I don't see 
contention at all. It scales to four processors almost linearly. Could 
you please make sure that it is not your code (customgenerator or 
logger) that causes contention.

I have been testing using CLISER and EnMasse/Actinia; with 1,2,4,8,16 
and 32 threads in the server (inside a single JVM). With 4 threads it 
runs approximately 3 times faster than with one, and it does not change 
its speed when more threads are added (and all threads are loaded in 
parallel). I used about 300 files of medium sizes to run through the 
engine to test performance.

David

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