> From: Leon Rosenberg [mailto:[EMAIL PROTECTED] > Subject: Re: Performance tricks with multiple tomcat instances > > Hmm, I always thought operations which are declared atomic > are guaranted to be executed at once, for example addition.
Addition is normally not atomic; assignment normally is. Exceptions exist, of course. > Unfortunately we have water damage, so my desk and my pc are > in the kitchen, because my workroom is used as nursery, so I > can't check in the books right now :-( I know the feeling of disruption: both our bathrooms at home are being remodeled at the same time... > we experienced a 1:1 ratio between tomcat threads and > parallel incoming requests. The timeout was 20 seconds, > but each test client just shot requests one after another. That's not real-world behavior, which would normally include a variable delay between requests. (Our test drivers do when we're simulating real-world performance; we eliminate the delay when doing stress testing.) > With http 1.0 the number of actually busy threads droped > down to approx. 20. Definitely something odd going on. This warrants further research, which I don't have time to do right now. > I haven't looked in the source code, but at the time of tomcat 5 > development the NIO wasn't yet released, so there were no select in > java available. The select capability isn't required to implement the behavior I described. Once the request is read in over the wire, the request object is passed off to a worker thread, and the reader thread goes back for another one. I'm going to have to dig deeper into the Catalina connector code when I get a bit more time. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
