Talk:Virtualization

The VIRT column doesn't say much about the amount of memory used. This can be easily seen by comparing the total amounts of memory used in both cases: they're more or less the same, even though the VIRT value for the java process is very different.

--Onno Molenkamp 18:07, 14 June 2010 (CEST)

This isn't just a virtualization issue - I upgraded my PC to Ubuntu 10.04 which uninstalled the Sun JDK and installed OpenJDK. Any development work I did in Netbeans which launched Glassfish completely crippled my machine. After removing OpenJDK and re-installing the Sun JDK, all was well again. This on a straight Linux machine, no virtualized anything. Given this, I cannot honestly recommend OpenJDK for any purpose what-so-ever.

Added on top of this is that the OpenJDK applet plugin doesn't support the Java console, so debugging applets is infeasible (there's a work-around to launch FireFox from a console, but that's not helpful when trying to debug for an end-user).

--Nathan 02:26, 15 June 2010 (CEST)

I agree that 512m is much too high for most Java applications. A recent version of Sun JDK bumped the default heap size to 256 MB, though, so if you're concerned about resources, I'd strongly recommend to find a way for setting the maximum heap and permgen size in Hudson (I guess it'd be fine with 64 MB too).

--Daniel 09:20, 15 June 2010 (CEST)