How do I limit java.exe memory?
My java.exe is using 1.4 gig of memory on a server that is running a collector and an agent. I heard I could change a setting to limit that to a smaller size. Can I get details on that? thanks
hi Matt,
the memory consumption of the monitored application does not in any way correlate to the memory needed on the dynaTrace Collector. however, the number of connected dynaTrace Agents, the level of instrumentation and also the amount of capture data does.
500 MB is not very much, but for 1 Agent it should be fine most of the time. so if you really only have 1 Agent on this Collector, it sounds weird that you would need so much memory on the Collector.
if you could attach the Collector log - or better: a system information archive - we could take a look at it and maybe get an idea, what's going on here.
best, Christian
If startup time is the absolute most important thing you can put the collector on the monitored machine, as that will remove network round trips. Normally however the collector is installed on a separate machine on the same subnet, "close" (network-wise) to the monitored server. As you noted, putting the collector on the monitored server consumes resources on that server.
Note that 500M is not a recommended or supported heap size for a collector. It may work since it seems you have just one agent connecting to it, but keep this in mind if you see odd behavior (dropped events, etc). 1GB is the recommended heap setting even in a "tiny" installation.
Rob
Thanks Rob,
This is a test box and the application I'm tracing is 700 MB so I thought 500 would be enough. Having set that earlier I can see java.exe is running at 608,900 currently.
Setting to 500 worked for a while but then I got
dynaTrace Collector@xxxxx: The instrumentation of Agent 'xxxx' has been refused.
I'll set it to 1 gig but it seems odd to need that much, that's practically twice the size of the application it's monitoring.
Chris,
The folks at dynatrace recommended we run the collector on the same server to reduce start up time.
I see it was set to 2G but I dropped it down to 500m.
Thank you
Matt,
You can change the memory allocation of your collector by editing the dtcollector.ini file located in your dT installation folder and modifying the value following the parameter "-Xmx".
Please note that it is not recommended to have your collector running on the same machine as your agent as it might uselessly put some load on this machine.
Chris
