我有一个 wordpress 网站，我在上面进行了繁重的负载测试。正如您在下面看到的，CPU 使用率当然很高，但同时 RAM 使用率永远不会高于 0.4%。负载测试不会产生任何错误，但网站的加载时间很长。我担心 RAM 的可用容量并没有真正使用。还是每秒 10000 个客户端的低 RAM 使用率是正常的？
服务器规格：
- CPU：AMD Ryzen 7 PRO 3700 8 核处理器（16 核）
- 内存：64 GB
- 固态硬盘：960 GB NVMe
- 带宽：1 Gbps
- 操作系统：Ubuntu 20.04.4 LTS
未激活缓存
top我用命令得到这些结果
top - 14:12:22 up 4:11, 2 users, load average: 29.49, 16.27, 7.29
Tasks: 467 total, 143 running, 301 sleeping, 23 stopped, 0 zombie
%Cpu(s): 27.6 us, 45.5 sy, 0.0 ni, 24.8 id, 0.0 wa, 0.0 hi, 2.1 si, 0.0 st
MiB Mem : 64306.9 total, 50683.7 free, 7559.5 used, 6063.7 buff/cache
MiB Swap: 7630.0 total, 7630.0 free, 0.0 used. 55881.2 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
37346 nginx 20 0 270356 266728 6364 R 78.1 0.4 2:19.89 nginx
57982 fibonac+ 20 0 355720 153908 105132 S 14.0 0.2 0:03.36 php-fpm
61772 fibonac+ 20 0 353552 150692 105776 S 14.0 0.2 0:01.26 php-fpm
1524 mysql 20 0 9117616 192712 20468 S 13.6 0.3 1:17.50 mysqld
57048 fibonac+ 20 0 355788 153888 105072 S 13.6 0.2 0:04.08 php-fpm
59186 fibonac+ 20 0 353712 151920 105132 S 13.6 0.2 0:02.86 php-fpm
61435 fibonac+ 20 0 353680 150108 105120 R 13.6 0.2 0:01.66 php-fpm
57693 fibonac+ 20 0 355760 153964 105132 S 13.3 0.2 0:04.53 php-fpm
59195 fibonac+ 20 0 353684 151912 105124 S 13.3 0.2 0:02.86 php-fpm
51154 fibonac+ 20 0 357824 156160 105136 R 12.3 0.2 0:08.10 php-fpm
51197 fibonac+ 20 0 357780 156064 105088 R 12.0 0.2 0:07.05 php-fpm
58034 fibonac+ 20 0 355728 153616 105132 R 11.0 0.2 0:03.17 php-fpm
51261 fibonac+ 20 0 357780 156064 105136 R 10.0 0.2 0:06.74 php-fpm
52563 fibonac+ 20 0 358116 162056 110892 R 10.0 0.2 0:06.62 php-fpm
57410 fibonac+ 20 0 355728 153948 105132 R 10.0 0.2 0:03.86 php-fpm
59521 fibonac+ 20 0 351636 149816 105136 R 10.0 0.2 0:01.98 php-fpm
60246 fibonac+ 20 0 353752 151856 105140 R 10.0 0.2 0:02.70 php-fpm
51147 fibonac+ 20 0 357812 156156 105136 R 9.6 0.2 0:07.93 php-fpm
51210 fibonac+ 20 0 357780 156136 105136 R 9.6 0.2 0:08.08 php-fpm
51225 fibonac+ 20 0 357776 156112 105128 R 9.6 0.2 0:07.47 php-fpm
51241 fibonac+ 20 0 357780 156112 105136 R 9.6 0.2 0:06.95 php-fpm
51251 fibonac+ 20 0 357784 156072 105136 R 9.3 0.2 0:06.92 php-fpm
51255 fibonac+ 20 0 357784 156132 105140 R 9.3 0.2 0:07.43 php-fpm
57054 fibonac+ 20 0 355784 153952 105124 R 9.3 0.2 0:03.91 php-fpm
57056 fibonac+ 20 0 355768 153960 105132 R 9.3 0.2 0:03.85 php-fpm
59192 fibonac+ 20 0 353708 151508 105120 R 9.3 0.2 0:02.73 php-fpm
61746 fibonac+ 20 0 343316 140124 105140 R 9.3 0.2 0:00.74 php-fpm
51233 fibonac+ 20 0 357776 156112 105140 R 9.0 0.2 0:06.65 php-fpm
51243 fibonac+ 20 0 357784 156140 105120 R 9.0 0.2 0:07.97 php-fpm
55161 fibonac+ 20 0 355728 153988 105132 R 9.0 0.2 0:04.28 php-fpm
57424 fibonac+ 20 0 355736 153600 105132 R 9.0 0.2 0:03.30 php-fpm
59185 fibonac+ 20 0 353684 151496 104832 R 9.0 0.2 0:02.73 php-fpm
51177 fibonac+ 20 0 357812 156132 105136 R 8.6 0.2 0:07.17 php-fpm
57401 fibonac+ 20 0 355728 153620 105132 R 8.6 0.2 0:03.25 php-fpm
51239 fibonac+ 20 0 357836 156128 105136 R 8.3 0.2 0:06.93 php-fpm
54835 fibonac+ 20 0 357776 155544 104892 R 8.3 0.2 0:04.93 php-fpm
61764 fibonac+ 20 0 345492 143512 105588 R 8.3 0.2 0:01.07 php-fpm
50951 fibonac+ 20 0 357860 156164 105140 R 8.0 0.2 0:08.77 php-fpm
51024 fibonac+ 20 0 357816 156128 105136 R 8.0 0.2 0:07.97 php-fpm
51160 fibonac+ 20 0 357808 156156 105136 R 8.0 0.2 0:07.45 php-fpm
54833 fibonac+ 20 0 357832 155788 104816 R 8.0 0.2 0:06.09 php-fpm
57047 fibonac+ 20 0 355788 153864 105068 R 8.0 0.2 0:03.91 php-fpm
59193 fibonac+ 20 0 355760 153208 105080 R 8.0 0.2 0:03.08 php-fpm
63679 fibonac+ 20 0 260456 107648 80836 R 8.0 0.2 0:00.24 php-fpm
63682 fibonac+ 20 0 260456 107672 80860 R 8.0 0.2 0:00.24 php-fpm
51028 fibonac+ 20 0 357856 156068 105136 R 7.6 0.2 0:06.58 php-fpm
53620 fibonac+ 20 0 357776 156048 105132 R 7.6 0.2 0:05.68 php-fpm
54832 fibonac+ 20 0 357776 155968 105052 R 7.6 0.2 0:05.61 php-fpm
55152 fibonac+ 20 0 357780 156040 105132 R 7.6 0.2 0:05.36 php-fpm
57981 fibonac+ 20 0 355732 153596 105132 R 7.6 0.2 0:03.30 php-fpm
58035 fibonac+ 20 0 355736 153604 105132 R 7.6 0.2 0:03.29 php-fpm
59184 fibonac+ 20 0 353736 151484 105100 R 7.6 0.2 0:02.47 php-fpm
59189 fibonac+ 20 0 356072 159176 110760 R 7.6 0.2 0:05.38 php-fpm
63683 fibonac+ 20 0 260456 106668 80072 R 7.6 0.2 0:00.23 php-fpm
51208 fibonac+ 20 0 357780 156188 105140 R 7.3 0.2 0:07.25 php-fpm
51237 fibonac+ 20 0 357776 156184 105136 R 7.3 0.2 0:07.43 php-fpm