Memory Leaks

I've created a while suite of plugins for my personal server. Lately I've been having an issue where the memory usage on the server is hitting 100% and creating a lot of lag. I don't know if the problem is with my plugin or not, but still I could use any advice on detecting where these memory issues are and tips on preventing them in my own plugins.

Thanks.

 

theres a java program VisualVM which can tell you what your server and plugins are using for memory and stuff, you might wana look at it here, http://visualvm.java.net/

 

Okay thanks, I'll check it out

Holy crap, this thing is awesome. Thanks!

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

no problem, I thought you would like that, I wanted to analyze how much memory one of my plugins was using once, and after searching for about an hour i found that precious gem

 

One question though. I monitored it on my private server, but I want to use it to monitor a remote server I run. Do you happen to know of any guides to do this?

 

sorry that i don't know, I've never had to run it remotely

edit, this may help you, I'm not sure, http://visualvm.java.net/applications_remote.html

 

alrighty, thanks again

 

not a problem, hope you are able to find the memory leak (assuming it's not just craftbukkit itself)

 

@wwsean08 Awesome, why didn't I know of this?!
Is it possible to see exactly what memory is used where and how many? If so, this can be very useful at tracing down memory leaks in NoLagg/TrainCarts, which often happens.

Mmh no way to trace back where the objects are...
But seriously, why are so many SpawnerCreature.ChunkEntry objects made? In 1 second 20000 new entries were made...

 

haha, yah not a clue, i'm glad that you like it though @bergerkiller

 

@wwsean08 Great thanks to you, if you hadn't posted that I would have never noticed a severe String leak in TrainCarts' Destinations class
(It had 20000 String items for every destination and was growing recursively, with a 1MB save file as a result)

It's a pretty cool app, and by generating a heap you can look at ALL references, I love this
Finally possible to find out what causes the memory to increase so quickly.

 

thats great @bergkiller, it's a pretty neat tool, I will give it that