Hello! Sorry if it's not appropriate mail list for this question if it's so, please, point me to the correct place to ask. I have several linux (debian) servers with java applications each of them takes, for examples, 200 mbyte of RAM. I've noticed that on machines with 2.4 kernels VIRT and RES memory (accordinly to 'top' values) are equal. So top shows me that VIRT == RES == 200 mbyte (approximately). But! On the servers with 2.6 kernel I have another picture, VIRT memory in several times bigger than RES. For example real memory of java proccess is 146 mbytes, but virtual - 470 mbytes. At the firt look it isn't a problem, but when I have several java processes and summary of their virtual memory is more than physical memory on the server - operatin system begin swapping although there is 30-50% of free memory (2 Gbyte memory on each machine). At the end we have machine that fall into hard swapping when big part of memory is actually free. I've tried to play with "echo 0 > /proc/sys/vm/swappiness" but it didn't give me good results. Please, point me to doc where I can read about "physics" of this process and where I can make some tunning to avoid this effect of growing virtual memory on 2.6 kernels? Maybe, it depends on the difference between NPTL and linuxthreads realization? Thank you for your answers! -- WBR, Alexander Burnos -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
