Gamer friend Scott just discovered that the reason he was having so much trouble with PCGen under Linux was that the JVM was defaulting to a rather small heap size, effectively thrashing the app into oblivion when he tried to print.

Now, while it’s true that PCGen is as piggy as a perl script when it comes to building complex data structures in memory, it’s still fundamentally a straightforward application, and yet it exceeds the default maximum heap settings. He had plenty of free RAM, gigs of free VM, and here was Sun’s Java, refusing to use any of it unless he relaunched the application with a command-line override. Doing so not only fixed printing, it made the entire application run substantially faster. Feh.

I’d noticed a slowdown with recent versions of PCGen on my Mac as well, but Apple was good enough to compile their JVM with defaults sufficient to at least make it run completely. Sure enough, though, increasing the default heap settings makes it run faster, by eliminating a whole bunch of garbage collection.

In other words, with Java, Sun has managed to replicate the Classic MacOS annoyance of adjusting memory allocation on a per-application basis, and made it cross-platform!

PCGen is still the only major Java app I have any use for on a regular basis, although there’s another one that has recently entered my arsenal of special-purpose tools, Multivalent. I have no use for 99% of its functionality, but it includes robust tools for splitting, merging, imposing, validating, compressing, and uncompressing PDF files, as well as stripping the copy/print/etc limitations from any PDF you can open and read.

There’s another Java application out there that might join the list sometime soon, Dundjinni, but first the manufacturers have to finish porting it from Windows to the Mac…