> thanks a lot Mark. > sorry i made a mistake just now, the correct report for the squid process > should be as follow, the one i posted just now is for runcache process. for > squid process, it seems that VSZ is not significantly larger than RSS. > > USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND > nobody 19729 48.9 32.4 1303636 1301388 ? S Apr03 10682:44 squid -NsY > > the return from top is > top - 15:06:17 up 23 days, 10:18, 4 users, load average: 1.20, 1.13, 1.06 No , in this case , it seems you don't have a mem. problem,however for overall system performance and swapping (if any), also check the output of : # free M.