Another possibility is fragmentation in a heap manager, causing excessive search times for a memory block, or a large number of heap compactions. This is pure conjecture, as I have no knowledge of the memory management model in J or XP.
A memory leak should be visible in the glorious Task Manager: if you put up the graph of memory in use, and the inuse memory keeps growing (just note the in-use memory on a scrap of paper every 30 minutes or so...), somebody may have a memory leak. Then, all you have to do is to identify "somebody". Bob On Fri, 2007-09-07 at 17:31 -0400, Devon McCormick wrote: > If there are other symptoms like an increase in paging, I might suspect a > memory > leak. > > On 9/7/07, Henry Rich <[EMAIL PROTECTED]> wrote: > > > > I saw something like this (on J32) years ago. It went away after a > > reboot and never returned. I have run the same long job hundreds of > > times since then. > > > > Henry Rich > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] On Behalf Of Anssi Seppälä > > > Sent: Friday, September 07, 2007 4:38 PM > > > To: General forum > > > Subject: [Jgeneral] XP 64bit low performance > > > > > > With 64 bit J in XP64 I have noticed that after some time the J > > > program becomes slower. For example 1,5 hours identical computation > > > (using mapped files of 1300MB) takes 10 hours. After restarting the > > > operating system the computation speed returns to the original status. > > > > > > This is obviously not only related to J, but there is so little > > > information what and why such happens. I have no idea what happens > > > there. Only thing I see is Task Manager that shows that J is taking > > > longer CPU time. > > > > > > I wonder if somebody has this similar experience? Is there any idea > > > what I should to observe to find the reason that makes J run slower? > > > > > > Anssi > > > > > > ---------------------------------------------------------------------- > > > For information about J forums see > > > http://www.jsoftware.com/forums.htm > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
