[rt-users] decode this line in the Wiki for me?

[Jo Rhett]

In the Wiki FAQ about performance, I found the following run on  
sentence.  I've reread it a dozen times and I'm still not sure that I  
completely understand what the author meant.   If someone would be  
willing to parse this out for me, I'd be happy to rewrite it for the  
wiki.

> Memory. RT uses a lot of memory in total. You need adopt amount of  
> process(Apache, FastCGI, DB) to fit into 70% your memory under  
> average workload. For example, if you have RT on Apache/mp/mysql  
> with ~20-30 end-users, then it's enough to have 4-6 Apache processes  
> this also control DB processes/threads because eache Apache instance  
> with Apache::DBI has own DB connect each DB connect require one or  
> more DB process/thread to support. Also people report that one  
> FastCGI process can serve 2-3 Apache processes. You also have to  
> leave room for memory usage growing, example: Apache/mp process has  
> 10-25MB size under average workload, but on big incoming message  
> memory footprint could grow up to 200-300MB. Out of memory is most  
> perfomance problem it's blow up HDD activity for swap out/in memory.


In particular, "adopt amount of process to fit into 70% your  
memory".   Does this mean calculate the memory usage of Mod_Perl or  
FastCGI processes and come up with a number of processes which  
wouldn't exceed 70% of your total memory?  Ie,
	60mb per process
	1024mb total ram

	Set Apache MaxServers = 11 ?   (60mb * 11 = 660mb of ram)

-- 
Jo Rhett
Net Consonance : consonant endings by net philanthropy, open source  
and other randomness


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