The TOP command results:
Mem: 3991840k total, 1496328k used, 2495512k free, 156752k buffers **Swap**: 3905528k total, **3980k** used, 3901548k free, 447860k cached PID USER PR NI VIRT RES SHR S %开发者_Python百科CPU %MEM TIME+ **SWAP** COMMAND 28250 www-data 20 0 430m 210m 21m R 63 5.4 0:07.29 **219m** apache2 28266 www-data 20 0 256m 40m 21m S 30 1.0 0:01.94 **216m** apache2 28206 www-data 20 0 260m 44m 21m S 27 1.1 0:10.27 **215m** apache2 28259 www-data 20 0 256m 40m 21m S 26 1.0 0:02.21 **216m** apache2
The details list shows a group of apache2 processes are using SWAP memory about 210m+ each, but the summary reports only 3980k is used. The total SWAP memory in the detail list is much greater than in the summary. Do the two swap
refer the same thing?
Quoted from http://www.linuxforums.org/articles/using-top-more-efficiently_89.html :
VIRT=RES+SWAP
As explained previously, VIRT includes anything inside task's address space, no matter it is in RAM, swapped out or still not loaded from disk. While RES represents total RAM consumed by this task. So, SWAP here means it represents the total amount of data being swapped out OR still not loaded from disk. Don't be fooled by the name, it doesn't just represent the swapped out data.
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