On 30/09/2020 09:32, Arshiya Shariff wrote: > Thank you for the response Mark , > >>> Are you able to test with a custom Tomcat build and/or build Tomcat 9 from >>> source for testing? > Yes Mark , we will be able to test with the jars built from Tomcat 9 source > for testing .
The reduced memory footprint changes have now been back-ported to 9.0.x. Please let us know how you get on with your testing. Mark > > Thanks and Regards > Arshiya Shariff > > -----Original Message----- > From: Mark Thomas <ma...@apache.org> > Sent: Tuesday, September 29, 2020 12:25 AM > To: users@tomcat.apache.org > Subject: Re: HTTP2: memory filled up fast on increasing the connections to > 1000/2000 (Embedded tomcat 9.0.38) > > On 28/09/2020 17:58, Arshiya Shariff wrote: >> Hi All, >> With 200 threads(users) , ramp up duration of 2 seconds , loop count 80 and >> by sending 1000 http2 requests/sec from JMeter Client to an embedded tomcat >> application we did not observe any memory issue , but on sending 1000 http2 >> requests/sec with 2000 or 1000 users from JMeter , the application's heap >> space of 20 GB is occupied in 2 minutes and after 2 full GCs the memory >> clears and comes down to 4GB (expected) . >> >> Embedded tomcat Version:9.0.38 >> Max Threads : 200 >> All other properties are the tomcat defaults. >> >> Why is tomcat not able to process many connections ? > > You haven't provided any evidence that Tomcat isn't able to process "many" > connections. > >> Why is the memory filled when the connections are increased, are there any >> parameters to tune connections ? > > It looks like users == HTTP/2 Connection. Connections are required to > maintain state for closed streams for both prioritisation and for error > handling. More connections == more state == more memory. > > Given the number of connections increased by a factor of between 12.5 and 25, > that the memory usage only increased by a factor of 5 looks to be a positive > result rather than an issue. > > There are significant improvements to memory usage in this area in Tomcat > 10.0.x that will get back-ported to 9.0.x but more testing is required. > > Are you able to test with a custom Tomcat build and/or build Tomcat 9 from > source for testing? > > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
