Setting JVM heap sizes

[kminder]

Couldn't find this with a search.
Is there a way to set the startup and max jvm heap sizes for the server and client? I wonder how Sage sets the defaults for these? I'd like to reduce the impact of any garbage collection if possible.

For example
java -Xms256m -Xmx512m ...

[Narflex]

HKEY_LOCAL_MACHINE\SOFTWARE\Frey Technologies\SageTV\JVMMaxHeapSizeMB

Can be used to set the heap max in the JVM in MB. There's no way to override the initial heap size setting in SageTV.

[bcjenkins]

Would you elaborate please? What would limiting this do for anyone?

[kminder]

The JVM always imposes a maximum heap size. For a normal JVM the max heap is set to 64MB by default. I have no idea what SageTV sets it to be default. I was more interested in setting the initial heap size to something larger in order to avoid the inevitable performance hit caused by the garbage collector.

[trothwell]

I was getting my heap size filled. So the log was "[Full GC ..." and it took 120sec to do the garbage collection. The size of the heap then was like 128megs.

I've just changed the max size to 512 and the max time to 10. I'm hoping that means it won't force a garbage collection until it hits 512. And even then, it won't take longer than 10sec on garbage collection.

The only time this is really a pain is when I'm using the menus. Although, the playback of video is fine (while in the program menu for example) during the gc. Wouldn't it be great if it did the garbage collection while I was watchin (not menu).

[sojourner753]

Originally Posted by trothwell

I was getting my heap size filled. So the log was "[Full GC ..." and it took 120sec to do the garbage collection. The size of the heap then was like 128megs.

I've just changed the max size to 512 and the max time to 10. I'm hoping that means it won't force a garbage collection until it hits 512. And even then, it won't take longer than 10sec on garbage collection.

The only time this is really a pain is when I'm using the menus. Although, the playback of video is fine (while in the program menu for example) during the gc. Wouldn't it be great if it did the garbage collection while I was watchin (not menu).

How did this work out for you?
Where did you make these changes? In the registry?

thanks

[trothwell]

A hard drive failed which resulted in Windows reinstall. I didn't modify the settings again though. It seems like the latest version of SageTV fixed something. I don't have problems with the app hanging during the GC.

[sojourner753]

Originally Posted by trothwell

I've just changed the max size to 512 and the max time to 10. I'm hoping that means it won't force a garbage collection until it hits 512. And even then, it won't take longer than 10sec on garbage collection.

Trothwell, where did you make this change? I don't see the max time attribute in the registry path mentioned above.