topコマンドの VIRT、RES、SHR などの意味。

top - 20:16:36 up 22 days, 20:38, 1 user, load average: 0.00, 0.04, 0.05 Tasks: 128 total, 4 running, 124 sleeping, 0 stopped, 0 zombie %Cpu0 : 5.0 us, 0.7 sy, 0.0 ni, 94.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 3.3 us, 0.3 sy, 0.0 ni, 96.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu2 : 0.3 us, 0.0 sy, 0.0 ni, 99.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 5946284 total, 146196 free, 759300 used, 5040788 buff/cache KiB Swap: 6160380 total, 6128952 free, 31428 used. 4636564 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME COMMAND 986 mysql 20 0 2131400 464060 6912 S 8.3 7.8 405:36.55 mysqld 26823 apache 20 0 638832 21804 10760 S 0.7 0.4 0:00.27 httpd 1 root 20 0 192760 3128 2016 S 0.0 0.1 1:01.02 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.10 kthreadd