On Tuesday, August 20, 2002, at 10:33 AM, Olivier Cinquin wrote: On Tuesday, August 20, 2002, at 04:34 , David A. Gatwood wrote: On Tue, 20 Aug 2002, Olivier Cinquin wrote: Hello, I was just wondering what the following message means? Could only find an obscure reference to KDE on the Web... Aug 20 11:14:55 localhost mach_kernel: (default pager): [KERNEL]: no space in available paging segments; swapon suggested I get the message after playing animated gifs I created, which causes an incredible amount of memory thrashing when played from Web browsers, for some reason... Wow. I haven't seen that message since MkLinux DR3. Does your system crash when this happens? No, it just gets very unresponsive and spends its time swapping... The message was repeated more than 100 times within a few minutes. Olivier I have not seen this message with MacOS X, however when MacOS X is adding swap spaces in /var/vm, it runs like a slug. I experienced this feature early in MacOS X, so I modified /etc/rc and changed the arguments to dynamic_pager to dynamic_pager -H 40000000 -L 576870920 -S 536870912 -F ${swapdir}/swapfile So now it creates 524MB swap spaces instead on 80MB, and its performance was much more predictable. Now as to your message, in other VM UNIX's I've run across, they have been limited to a number of swap devices (16 comes to mind), so perhaps the system is looking for more swap space to map, but dynamic_pager cannot add any more. 16 X 80 = 1280, only ~ 1GB If you can repeat this situation with the default setup, do a ls -al /var/ vm and see how many swapfiles there are. Also note that when it does not require extra swap spaces, the dynamic_pager will deallocate swapfiles except for the primary one, and this also seems to take time, as active pages seem to be consolidated from one swapfile to another ... a lot of IO occurs. I wonder if KMAP space is also consolidated, I'd expect serious pregnant pauses in a non Monolithic Kernel. Hope this helps Philip _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.