> From: Peter Lin [mailto:[EMAIL PROTECTED] > Subject: Re: OutOfMemoryError - 100 thread limit? > > the default Perm is 64M. If LeeAnn's webapp have a large number of > classes, maybe there's too many; therefore forcing the VM to resize > the perm.
IIRC (haven't looked at core HotSpot code in detail since 1.4.1 days), the virtual address boundary between perm and the other generations is fixed at JVM initialization and never moves. The perm gen does go through GC just like the other gens, but no memory ever moves between the perm and any other space, and the perm gen maximum virtual address range never changes. The HotSpot JVM allocates, but does not commit, all of the -Xmx space at startup in one contiguous block (although there were rumors of that changing in later JVMs). Only the -Xms portion is committed, split up into three regions - young, old, and perm. When a region fills and GC doesn't reduce the usage significantly, additional pages are committed in whichever region needs expanding. I think what was happening is that LeeAnn simply had more classes than would fit in 64 MB. Nothing to do with threads, just the total number of classes in all the applications added together. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
