"Mladen Turk" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Petr Sumbera wrote: >> Hi Bill and all, >> >> not sure what is the right way for comparison between using and not using >> APR. I tried Apache ab tool like this: >> >> ab -c 4 -n 10000 http://localhost:8080/favicon.ico >> >> And I don't see any difference. Actually it might be little bit slower >> with APR. The file size is 21630, so it should use sendfile then (well >> actually our APR doesn't use sendfile at the moment as far as I know). >> > > The purpose of APR is to change the model from thread-per-connection > to thread-per-request. This means it will behave much faster when > you have 1000 concurrent clients using Keep-Alive (HTTP 1.1). >
I agree with Mladen here. Your test is artificial, so under most systems the non-APR connector will win (since you only have 4 clients connecting to TC). And since you haven't specified '-k' to ab, you are really testing connection speed, which isn't realistic. On Solaris, having a 1000 threads blocking on input isn't that big of a deal, so I'm not sure about the "much faster" claim, but I haven't profiled Tomcat lately :). > In that case you'll be able to serve them all with lower number > of maxThreads. > > So, try to use the 'normal' test tool instead a brute force one like 'ab' > that will reflect the real load to your boxes. > I mean, the ab (Apache Bench) is a DoS tool, right ;) > When I was profiling, I used JMeter and 500 clients with about a one minute ramp-up time (I don't care about how it handles an accept flood), and about a 5-10 second delay between requests (I don't have the script I used anymore, so I don't remember the exact value). Also, if you use JMeter, use the HttpClient Sampler or configure the java.net Sampler to use a bigger than default pool, since by default the java.net Sampler doesn't scale up to this level (skewing the results). Also interesting would be to use a longer connectionTimeout on the <Connector /> and longer delays between requests. But for a good comparision, make sure that the maxThreads attribute on the <Connector /> is large enough to handle the lode. > Regards, > Mladen. > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
