Have we ever looked into which java method would require the most resources/time during the process of entering the conference room ?
Sebastian Wagner Director Arrakeen Solutions, OM-Hosting.com http://arrakeen-solutions.co.nz/ https://om-hosting.com - Cloud & Server Hosting for HTML5 Video-Conferencing OpenMeetings <https://www.youracclaim.com/badges/da4e8828-743d-4968-af6f-49033f10d60a/public_url> <https://www.youracclaim.com/badges/b7e709c6-aa87-4b02-9faf-099038475e36/public_url> On Tue, 2 Feb 2021 at 16:48, Maxim Solodovnik <[email protected]> wrote: > While do load testing I did the following: > > create Jmeter test loading "semistatic" stateless error page with 300 > simultaneous threads (I can share this test it is very simple) > CPU usage of OM process was near to 100% > the situation is better if Tomcat has more threads (maxThread parameter) > > I guess we need to check "The Ultimate Tomcat Performace Guide" :))) > > On Tue, 2 Feb 2021 at 10:41, [email protected] <[email protected]> > wrote: > > > Also the spikes are on the CPU actually more than on the memory: > > > > > https://cwiki.apache.org/confluence/display/OPENMEETINGS/Performance+Testing#PerformanceTesting-ClusterPerformancetestresult02-022021 > > > > The spike is just 50-60 users. > > > > Why would CPU spike to almost 100% just for that amount of users ? > > > > I can try with 4GB for Openmeetings and repeat the test. > > > > Thanks > > Seb > > > > Sebastian Wagner > > Director Arrakeen Solutions, OM-Hosting.com > > http://arrakeen-solutions.co.nz/ > > https://om-hosting.com - Cloud & Server Hosting for HTML5 > > Video-Conferencing OpenMeetings > > < > > > https://www.youracclaim.com/badges/da4e8828-743d-4968-af6f-49033f10d60a/public_url > > > > > < > > > https://www.youracclaim.com/badges/b7e709c6-aa87-4b02-9faf-099038475e36/public_url > > > > > > > > > On Tue, 2 Feb 2021 at 16:34, Maxim Solodovnik <[email protected]> > > wrote: > > > > > On Tue, 2 Feb 2021 at 10:30, [email protected] < > > [email protected]> > > > wrote: > > > > > > > I think what you mean is you have OpenMeetings and MySQL and KMS on > one > > > > instance with 4GB. > > > > > > > > But its 2GB Just for OpenMeetings. > > > > > > > > > > I mean > > > 4GB just for OM (demo-next) > > > 8GB just for OM (demo-prod) > > > and this might need to be increased in case of many users > > > > > > Additionally Tomcat's maxThreads might need to be increased here: > > > > > > > > > https://github.com/apache/openmeetings/blob/master/openmeetings-server/src/main/assembly/conf/server.xml#L74 > > > > > > I suspect lot's of simultaneous users need more resources > > > > > > > > > KMS is separated with another 2GB > > > > MySQL is on another server with another 2GB > > > > So that would be 6GB in total. But only 2 are allocated to > > OpenMeetings. > > > > > > > > XmX=2GB for OpenMeetings should be enough and not crash with 50-60 > > users > > > > entering the room at the same time. > > > > > > > > Thanks > > > > Sebastian > > > > > > > > Sebastian Wagner > > > > Director Arrakeen Solutions, OM-Hosting.com > > > > http://arrakeen-solutions.co.nz/ > > > > https://om-hosting.com - Cloud & Server Hosting for HTML5 > > > > Video-Conferencing OpenMeetings > > > > < > > > > > > > > > > https://www.youracclaim.com/badges/da4e8828-743d-4968-af6f-49033f10d60a/public_url > > > > > > > > > < > > > > > > > > > > https://www.youracclaim.com/badges/b7e709c6-aa87-4b02-9faf-099038475e36/public_url > > > > > > > > > > > > > > > > > On Tue, 2 Feb 2021 at 16:26, Maxim Solodovnik <[email protected]> > > > > wrote: > > > > > > > > > Hello Sebastian, > > > > > > > > > > It seems 2GB of RAM is not enough for OM > > > > > `OutOfMemoryError: Container killed due to memory usage` > > > > > I never use less than 4GB (8-16GB in production) > > > > > > > > > > > > > > > > > > > > On Tue, 2 Feb 2021 at 09:54, Maxim Solodovnik < > [email protected]> > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > On Tue, 2 Feb 2021 at 07:23, [email protected] < > > > > > [email protected]> > > > > > > wrote: > > > > > > > > > > > >> Hi, > > > > > >> > > > > > >> I have been conducting a few more performance and load tests > with > > > the > > > > > goal > > > > > >> of increasing participants to 100++. > > > > > >> > > > > > >> The challenge is: > > > > > >> *If more then 50-60 users dynamically create a room Hash (using > > > > > Soap/Rest > > > > > >> API) and use that Hash to enter the conference room CPU and > memory > > > > > spikes > > > > > >> and server crashes* > > > > > >> > > > > > > > > > > > > Can you share API call sequence? > > > > > > Maybe we can write JMeter scenario for this? > > > > > > > > > > > > server crash is something bad > > > > > > What is happening? Is it a JVM crash? Or is the system low of > > > resources > > > > > > and the kernel kills the trouble-maker? > > > > > > > > > > > > > > > > > >> *Test scenario observations:* > > > > > >> - It does not matter if those users try to enter the same room > or > > > > > >> separate > > > > > >> rooms. In the above test scenario it's a mix of 4x4 conference > > rooms > > > > and > > > > > >> 20x1 webinars > > > > > >> - This can be reproduced stable and repetitively > > > > > >> - The issue starts with API calls taking 10sec++ and getting > more > > > > > slower. > > > > > >> Until the OpenMeetings Tomcat instance crashes > > > > > >> - The issue also manifests that -BEFORE- the server crashes you > > can > > > > see > > > > > >> video pods not completing the initialisation in the conference > > room > > > > > >> itself. > > > > > >> For example missing video pods or video pods without a webcam > > > stream. > > > > > >> Likely to be linked to slow running API or web-socket calls > > > > > >> => I can deliver data samples or screenshots if required via our > > > > > >> confluence > > > > > >> space. > > > > > >> > > > > > >> *Hardware and software:* > > > > > >> - Server and OpenMeetings Instance is isolated on a separated > > > > hardware > > > > > >> and > > > > > >> has 2GB of memory allocated > > > > > >> - There is no spike on KMS or Database hardware/CPU/memory. The > > > spike > > > > > is > > > > > >> only in the OpenMeetings Tomcat Server instance > > > > > >> > > > > > >> *Possible ways to mitigate without code changes:* > > > > > >> - You can mitigate part of this issue if you spread the users > to > > > > enter > > > > > >> over a longer time period. However it needs more than 10min > > > separation > > > > > to > > > > > >> enter without issues for 50-60 participants > > > > > >> - You can mitigate part of this issue if you for example create > > the > > > > > >> room-hash in a different process (like 1h before using) and once > > all > > > > > >> hashes > > > > > >> are created you enter the conference room. It still leads to > > issues, > > > > but > > > > > >> you can enter up to 100 users within 5-10min, if you just use > the > > > > links, > > > > > >> rather than create the link AND entering with the link at the > same > > > > > >> time/process > > > > > >> - Increasing Tomcat to more than 2GB of memory per Tomcat > > instance > > > > may > > > > > >> help, not sure by how much though > > > > > >> > > > > > >> => I think we should spend further time and propose ways to get > > rid > > > > of > > > > > >> those spikes. The mitigations are not realistic to really be > able > > to > > > > use > > > > > >> in > > > > > >> practise. > > > > > >> > > > > > >> *My proposal is:* > > > > > >> There is further analysis needed: > > > > > >> - Capture all OpenMeetings calls that happen during the create > > room > > > > > hash > > > > > >> and conference room-enter > > > > > >> - Measure call lengths and any calls during the create room > hash > > > and > > > > > >> conference room-enter and specific CPU spikes or memory usage > > based > > > > on a > > > > > >> per call basis > > > > > >> - Eventually get a stack trace or have a profile available that > > > > exports > > > > > >> the current in memory objects to review where and what create > > those > > > > > spikes > > > > > >> > > > > > >> Once a per-call analysis is there it should be a lot more easy > to > > > > > pinpoint > > > > > >> specific issues and propose improvements. > > > > > >> > > > > > >> As with all performance optimisation this is likely to need more > > > > > >> discussion > > > > > >> once more detailed data is available. > > > > > >> > > > > > >> Thanks, > > > > > >> Sebastian > > > > > >> > > > > > >> Sebastian Wagner > > > > > >> Director Arrakeen Solutions, OM-Hosting.com > > > > > >> http://arrakeen-solutions.co.nz/ > > > > > >> https://om-hosting.com - Cloud & Server Hosting for HTML5 > > > > > >> Video-Conferencing OpenMeetings > > > > > >> < > > > > > >> > > > > > > > > > > > > > > > https://www.youracclaim.com/badges/da4e8828-743d-4968-af6f-49033f10d60a/public_url > > > > > >> > > > > > > >> < > > > > > >> > > > > > > > > > > > > > > > https://www.youracclaim.com/badges/b7e709c6-aa87-4b02-9faf-099038475e36/public_url > > > > > >> > > > > > > >> > > > > > > > > > > > > > > > > > > -- > > > > > > Best regards, > > > > > > Maxim > > > > > > > > > > > > > > > > > > > > > -- > > > > > Best regards, > > > > > Maxim > > > > > > > > > > > > > > > > > > -- > > > Best regards, > > > Maxim > > > > > > > > -- > Best regards, > Maxim >
