CF8 and CF9 CFadmin - Request Tuning

[carl type3]

Greetings,

I am evaluating suitable values to put in CF8 and CF9 Server Settings > Request Tuning - particularly threads sections.

Are the default installed values the best for performance and stability or should changes be made? The CF9 performance brief (http://www.adobe.com/products/coldfusion/pdfs/cf9_performancebrief_ue.pdf) has these values configured differently from the default install:

Maximum number of simultaneous template requests 30 (10 CF8 & CF9 default)

Max running Jrun threads 100 (50 CF8 & CF9 default)

Even the value of Max running Jrun threads 100 would seem low, since I have been monitoring an idle (not serving any web pages applications) CF9 with Java JDK JCONSOLE and notice threads in use is 70.

Thanks in advance, Carl.

PS

just noticed CF8 standard differs from CF8 Enterprise in the default values listed:

Maximum number of simultaneous template requests 50

Max running Jrun threads n/a

Message was edited by: carl type3

[Owainnorth]

There's no correct answer to the question unfortunately - some sites work best with fewer threads as they only do a small amount of processing per hit, other sites do more processing so end up hanging onto threads for longer. It's a case of experimenting with different settings and watching how the response times are affected.

If your site isn't mega-busy you're almost certainly not going to notice any difference.

O.

[Charlie Arehart]

Carl, I'd add to Owain's comment to say that you could/should also use some monitor tool (CF Server Monitor, FusionReactor, SeeFusion, etc.) to be able to view how many simultaneous requests are typically running. Even on a busy site, it may be rare to have more than a few at the very same time.

But of course, when things go bad (database locks up, call to remote server from within code locks up, and more), then you may find that you fill up the available threads and CF seems "hung". But in that case, would having double or triple have helped? Maybe, maybe not. Depends on whether all or only some new requests would have hung up for that same reason.

There are diagnostics, tools, and resources that can help with making more informed decisions on these sort of things. I'm working on a resource (which will be housed at cf911.com) that will offer more well-organized information on topics like this, related to server troubleshooting.

Until then, there are a few consultants out there (myself included) who can help with such issues, if you find you don't get answers you need here or in your own research. I provide a list of such consultants at http://www.cf411.com/#cfconsult.

Hope some of that helps.

/charlie

[carl type3]

Thanks for your input Gents,

I do not think I am having a threads problem just curious how the values differ on a performance PDF from Adobe and default installed values. I may try to modify some values on a test environment and "see" what outcome is.

Cheers, Carl.