[xep-support] Different performance on different systems

[David Tolpin]

> What sort of environment are you running XEP in? Is it running  
> inside a Webapp,  from commandline or an embedded java application?  
> We found XEP doesn't scale across multiple CPUS in a multi-threaded  
> java application. Others have reported the same on this list.  
> Adding more CPUs actually makes the performance worse!!!!!!
>
> Perhaps the machine which you say is superior has 2 CPUs versus 1  
> for the machine which yields better performance.

Hi Chris,

in the old code of XEP there was code causing contention; I believe  
this code has been removed long ago. My belief is confirmed by a four- 
CPU box showing linear increase in performance with the number of  
threads. In any case, going from one CPU to two cannot impact the  
performance on the order of 10 times; in fact, 2 CPUs were never  
enough for contentions.

However, the original poster is complaining about non-buffered output  
in the PDF generator of an old version of XEP, a version which is 1,5  
years old now; and many bugs have been fixed  since that time. Most  
probably, the decrease in performance is caused by the target file  
location being a network drive. That issue had been dealt with a long  
time ago.

The recommendation is to make sure the problem goes away with the  
current version, and to upgrade.

David Tolpin
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