有人能解释一下这个顶部输出吗？每个 PHP 进程都使用了总内存或已用内存的 30%？此外，为什么所有 PHP 进程的总使用内存远远超过我的系统内存？这是共享内存吗？
提前致谢
top - 14:15:34 up 2 days, 12:38, 1 user, load average: 0.97, 1.03, 0.93
Tasks: 124 total, 1 running, 123 sleeping, 0 stopped, 0 zombie
Cpu(s): 4.9%us, 0.3%sy, 0.0%ni, 94.6%id, 0.0%wa, 0.0%hi, 0.1%si, 0.1%st
Mem: 1029508k total, 992140k used, 37368k free, 150404k buffers
Swap: 262136k total, 2428k used, 259708k free, 551500k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6695 www-data 20 0 548m 307m 292m S 0 30.6 8:06.55 php-fpm
6697 www-data 20 0 547m 306m 292m S 0 30.4 7:59.64 php-fpm
6691 www-data 20 0 547m 305m 291m S 2 30.4 8:04.96 php-fpm
6689 www-data 20 0 547m 305m 291m S 2 30.3 8:07.55 php-fpm
6696 www-data 20 0 540m 298m 292m S 1 29.7 8:13.43 php-fpm
6705 www-data 20 0 540m 298m 292m S 0 29.7 8:17.24 php-fpm
6699 www-data 20 0 540m 298m 291m S 4 29.7 8:07.39 php-fpm
6701 www-data 20 0 541m 297m 289m S 0 29.6 7:59.87 php-fpm
6700 www-data 20 0 540m 297m 290m S 0 29.5 8:09.92 php-fpm
6694 www-data 20 0 541m 296m 288m S 2 29.5 8:05.18 php-fpm
6707 www-data 20 0 541m 296m 288m S 0 29.5 8:09.40 php-fpm
6692 www-data 20 0 541m 296m 289m S 0 29.5 8:14.23 php-fpm
6706 www-data 20 0 541m 296m 289m S 3 29.5 8:07.59 php-fpm
6698 www-data 20 0 541m 295m 288m S 4 29.4 8:04.85 php-fpm
6704 www-data 20 0 539m 295m 289m S 2 29.4 8:13.58 php-fpm
6708 www-data 20 0 540m 295m 288m S 1 29.4 8:14.27 php-fpm
6802 www-data 20 0 540m 295m 288m S 3 29.3 8:11.63 php-fpm
6690 www-data 20 0 541m 294m 287m S 3 29.3 8:14.54 php-fpm
6693 www-data 20 0 539m 293m 287m S 2 29.2 8:16.33 php-fpm
6702 www-data 20 0 540m 293m 286m S 0 29.2 8:12.41 php-fpm
8641 www-data 20 0 540m 292m 285m S 4 29.1 6:45.87 php-fpm
8640 www-data 20 0 539m 291m 285m S 2 29.0 6:47.01 php-fpm
6703 www-data 20 0 539m 291m 285m S 2 29.0 8:17.77 php-fpm
8642 www-data 20 0 540m 291m 284m S 0 29.0 6:42.98 php-fpm
8646 www-data 20 0 540m 291m 284m S 0 28.9 6:41.18 php-fpm
10974 www-data 20 0 539m 285m 279m S 2 28.4 5:07.02 php-fpm
11827 www-data 20 0 539m 282m 275m S 0 28.1 4:28.41 php-fpm
答案1
是的，每个 php 进程使用 30%全部的记忆。
再次回答是的，共享内存就是您不能简单地添加的原因。请参阅“SHR”列，这是共享内存值，RES 代表常驻内存。来自“man top”：
n: %MEM -- Memory usage (RES)
A task's currently used share of available physical memory.
o: VIRT -- Virtual Image (kb)
The total amount of virtual memory used by the task. It includes all code, data and shared libraries plus pages that have been swapped out.
VIRT = SWAP + RES.
p: SWAP -- Swapped size (kb)
The swapped out portion of a task's total virtual memory image.
q: RES -- Resident size (kb)
The non-swapped physical memory a task has used.
RES = CODE + DATA.
r: CODE -- Code size (kb)
The amount of physical memory devoted to executable code, also known as the 'text resident set' size or TRS.
s: DATA -- Data+Stack size (kb)
The amount of physical memory devoted to other than executable code, also known as the 'data resident set' size or DRS.
t: SHR -- Shared Mem size (kb)
The amount of shared memory used by a task. It simply reflects memory that could be potentially shared with other processes.