question on capacity limits

[szczebel]

Hey,

I was not able to find this info in docs nor in other issues here.

Can you advise on how one can evaluate capacity limits of a JPro server, in terms of expected concurrent users? E.g.:

• I'm deploying on heroku, with RAM limit 512MB
• JPro JVM needs XXX MB of RAM when idle
• each user session needs YYY MB or RAM for jpro resources + ZZZ MB of whatever userdata is maintained by the app itself

Can you provide values or hints regarding XXX, YYY, ZZZ? I know ZZZ is for the app author to figure out, although some hints on how to assess it would be welcome (e.g. some heuristics on how many Nodes my scene has times N bytes, or something like that).

Do you have any performance/soak tests results that you can share?

Thanks, Adam

[FlorianKirmaier]

After a quick empirical test i have some numbers for you:

XXX = 30mb, according to a quick test (the ram usage of a minimal hello world program) YYY = 0, the "constant" ram usage per session seems to be close to zero AAA = 40mb is used per 1000 used, according to my empirical data. (This has some optimization potential in JPro) ZZZ = Whatever your application is using

So the ram usage would be: 30mb + sessions 0.04mb (NodesPerSession) + [Your additional ram usage]

You also need some buffer for the JVM, of at least 20%. In General, I would recommend more ram as 500MB for the process - especially on production.

[szczebel]

Hey @FlorianKirmaier ,

Thanks for the data, I think this issue can be closed. If you ever get to do any soak tests, sharing results would be appreciated :> E.g. I'd be thrilled to see how many user sessions JPro server was able to handle for application X (maybe something more advanced than HelloJPro) on a box/container with 1GB of RAM, while serving moderate traffic (e.g. one user-click per second requiring full scene repaint) until it fried with OOM errors :D

Side question: how do I pass Xmx options to JPro server from commandline? I followed your sample for heroku deployment, so my Dockerfile has this: CMD ["sh", "-c", "/server/bin/start.sh -Dhttp.port=$PORT -Dbackend.url=$BACKEND_URL"] Now I want to add '-Xmx$XMX_LIMIT' to the jvm args; will start.sh accept this as an argument? CMD ["sh", "-c", "/server/bin/start.sh -Dhttp.port=$PORT -Dbackend.url=$BACKEND_URL -Xmx$XMX_LIMIT"]

[FlorianKirmaier]

yes, that should work. All arguments passed to the ´start.sh´ are forwarded to the JVM.