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  1.  Home
  2. WDSCI-L
  3. November 2005

RE: javaw Slowdown

I think it might, though I haven't seen it in the last couple of lockups
(since I received your email). Something else I noticed in other lockups
today is that if I ALT-TAB to another window, and then back to WDSC, the
whole WDSC window is white.
Windows programs sit on a message queue waiting for information from Windows. When the messages are received, they carry out instructions. A message from Windows might be "redraw part of the window" or "minimize" or "a key was pressed" or "the mouse was clicked". So, the prgorams entire interaction with the user and the screen is based on this message queue.
If the program gets busy doing other things (like, it gets stuck in a loop, or it's busy doing some sort of disk access or calculation or whatever) then it never reads this message queue, and never gets the message that tells it that it has to re-draw part of it's screen.
This is when you get an area of the screen that's "white". (or, sometimes it looks like part of the window that had overlaid it). Because the program is busy with something else and not carrying out the instructions from Windows.
Since you see that "javaw.exe" is taking up lots of CPU, I'd guess that WDSC is getting stuck in a loop or is doing something that's very resource intensive.
Everything for WDSC will show as "jawaw.exe" because Java programs don't run directly on the computer's hardware. They run through the Java Virtual Machine. It's that virtual machine that runs directly on the computer's hardware. So when you see "javaw.exe" what you're really seeing is that the JVM is taking up lots of CPU. Unfortunately, it doesn't tell you what program is at fault, since you can potentially have lots of Java programs running at once.
I know, none of this helps you solve your problem... just thought the info might be interesting or helpful in some way.

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