正如标题所述，从 Ubuntu 20.05 LTS 升级到 Ubuntu 22.05 LTS 后，我的操作系统自动将几乎所有工作安排在单个 CPU 核心上。
我提供了一些屏幕截图来htop解释这个问题。
在下面的示例中，我已经运行make -j 32并且所有 make 进程都共享一个或两个核心，而不是使用不同的核心。
1[ 0.0%] 17[ 0.0%] 33[ 0.0%] 49[ 0.0%]
2[ 0.0%] 18[ 0.0%] 34[ 0.0%] 50[ 0.0%]
3[ 0.0%] 19[ 0.0%] 35[ 0.0%] 51[ 0.0%]
4[ 0.0%] 20[ 0.0%] 36[ 0.0%] 52[ 0.0%]
5[ 0.0%] 21[ 0.0%] 37[ 0.0%] 53[ 0.0%]
6[ 0.0%] 22[ 0.0%] 38[ 0.0%] 54[ 0.0%]
7[ 0.0%] 23[ 0.0%] 39[ 0.0%] 55[ 0.0%]
8[ 0.0%] 24[ 0.0%] 40[ 0.0%] 56[ 0.0%]
9[||||||100.0%] 25[ 0.0%] 41[ 0.0%] 57[ 0.0%]
10[ 0.0%] 26[ 0.0%] 42[ 0.0%] 58[ 0.0%]
11[ 0.0%] 27[ 0.0%] 43[ 0.0%] 59[ 0.0%]
12[ 0.0%] 28[ 0.0%] 44[ 0.0%] 60[ 0.0%]
13[ 0.0%] 29[ 0.0%] 45[ 0.0%] 61[ 0.0%]
14[ 0.0%] 30[ 0.0%] 46[ 0.0%] 62[ 0.0%]
15[ 0.0%] 31[||||||100.0%] 47[ 0.0%] 63[ 0.0%]
16[ 0.0%] 32[ 0.0%] 48[ 0.0%] 64[ 0.0%]
Mem[||||||||||||||| 18.0G/62.7G] Tasks: 367, 2174 thr; 34 running
Swp[ 0K/65.0G] Load average: 20.18 7.25 3.32
Uptime: 02:36:39
PID USER PRI NI VIRT RES SHR S CPU%▽MEM% TIME+ Command
22626 samzapo 20 0 85328 76484 4324 R 118. 0.1 0:00.25 htop
21565 samzapo 20 0 2415M 91528 71436 S 19.8 0.1 0:02.10 /snap/firefox/3
22013 samzapo 20 0 396M 313M 17380 R 19.8 0.5 0:01.43 /usr/lib/gcc/x8
22061 samzapo 20 0 289M 260M 17568 R 19.8 0.4 0:01.36 /usr/lib/gcc/x8
22064 samzapo 20 0 392M 304M 17340 R 19.8 0.5 0:01.36 /usr/lib/gcc/x8
22127 samzapo 20 0 375M 293M 16640 R 19.8 0.5 0:01.28 /usr/lib/gcc/x8
看起来无论我的计算机正在执行多少工作，其中大部分都会转到核心 9。
其他核心上正在进行一些工作，但就好像所有进程的亲和性都被设置为核心 9。
我可以使用例如强制操作系统调度不同的核心，taskset -c 10-63 make -j 32然后 make 将切换到使用所有核心。但是，当然，这种方式操作并不总是可行的，主要是因为其他应用程序也都尝试使用核心 9，比如我的互联网浏览器。
1[ 0.0%] 17[||||||||||||||||||||100.0%] 33[||||||||||||||||||||100.0%] 49[ 0.0%]
2[ 0.0%] 18[||||||||||||||||||||100.0%] 34[||||||||||||||||||||100.0%] 50[ 0.0%]
3[ 0.0%] 19[ 0.0%] 35[||||||||||||||||||||100.0%] 51[||||||||||||||||||||100.0%]
4[ 0.0%] 20[ 0.0%] 36[||||||||||||||||||||100.0%] 52[||||||||||||||||||||100.0%]
5[ 0.0%] 21[||||||||||||||||||||100.0%] 37[||||||||||||||||||||100.0%] 53[ 0.0%]
6[ 0.0%] 22[ 0.0%] 38[||||||||||||||||||||100.0%] 54[||||||||||||||||||||100.0%]
7[ 0.0%] 23[||||||||||||||||||||100.0%] 39[||||||||||||||||||||100.0%] 55[ 0.0%]
8[ 0.0%] 24[||||||||||||||||||||100.0%] 40[||||||||||||||||||||100.0%] 56[ 0.0%]
9[||| 10.0%] 25[ 0.0%] 41[||||||||||||||||||||100.0%] 57[||||||||||||||||||||100.0%]
10[ 0.0%] 26[ 0.0%] 42[ 0.0%] 58[||||||||||||||||||||100.0%]
11[ 0.0%] 27[||||||||||||||||||||100.0%] 43[||||||||||||||||||||100.0%] 59[ 0.0%]
12[||||||||||||||||||||100.0%] 28[||||||||||||||||||||100.0%] 44[||||||||||||||||||||100.0%] 60[||||||||||||||||||||100.0%]
13[||||||||||||||||||||100.0%] 29[||||||||||||||||||||100.0%] 45[ 0.0%] 61[ 0.0%]
14[||||||||||||||||||||100.0%] 30[||||||||||||||||||||100.0%] 46[ 0.0%] 62[ 0.0%]
15[||||||||||||||||||||100.0%] 31[||||||||||||||||||||100.0%] 47[ 0.0%] 63[ 0.0%]
16[|||||||| 27.3%] 32[||||||||||||||||||||100.0%] 48[||||||||||||||||||| 72.7%] 64[ 0.0%]
Mem[|||||||||||||||||||||||||||||||||||||||||||||||48.4G/62.7G] Tasks: 370, 2178 thr; 33 running
Swp[| 31.2M/65.0G] Load average: 21.02 9.82 5.77
Uptime: 02:43:57
PID USER PRI NI VIRT RES SHR S CPU%▽MEM% TIME+ Command
24497 samzapo 20 0 2280M 2222M 22428 R 114. 3.5 0:40.23 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24509 samzapo 20 0 2088M 2016M 19308 R 114. 3.1 0:39.87 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24518 samzapo 20 0 2062M 1992M 20404 R 114. 3.1 0:40.21 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24543 samzapo 20 0 2233M 2173M 22864 R 114. 3.4 0:40.22 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24546 samzapo 20 0 2508M 2400M 20240 R 114. 3.7 0:40.20 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24549 samzapo 20 0 2658M 2591M 20324 R 114. 4.0 0:40.22 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24551 samzapo 20 0 2537M 2469M 19108 R 114. 3.8 0:40.22 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25145 samzapo 20 0 1609M 1536M 19252 R 114. 2.4 0:24.81 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25445 samzapo 20 0 1472M 1407M 18832 R 114. 2.2 0:18.84 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25587 samzapo 20 0 992M 928M 18708 R 114. 1.4 0:15.06 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25591 samzapo 20 0 1083M 1017M 18708 R 114. 1.6 0:15.01 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26004 samzapo 20 0 770M 690M 18676 R 114. 1.1 0:07.29 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26012 samzapo 20 0 619M 543M 18664 R 114. 0.8 0:06.14 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26024 samzapo 20 0 587M 504M 18544 R 114. 0.8 0:04.75 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24505 samzapo 20 0 2219M 2156M 22340 R 105. 3.4 0:40.21 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24526 samzapo 20 0 2426M 2358M 23080 R 105. 3.7 0:40.18 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24547 samzapo 20 0 2308M 2248M 22744 R 105. 3.5 0:40.21 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24899 samzapo 20 0 1865M 1803M 18992 R 105. 2.8 0:30.36 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
24903 samzapo 20 0 1620M 1547M 22468 R 105. 2.4 0:29.81 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25360 samzapo 20 0 1511M 1445M 18820 R 105. 2.3 0:21.06 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25578 samzapo 20 0 1248M 1182M 18728 R 105. 1.8 0:17.50 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25733 samzapo 20 0 919M 852M 18768 R 105. 1.3 0:12.58 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25798 samzapo 20 0 963M 884M 19072 R 105. 1.4 0:10.04 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
25996 samzapo 20 0 557M 475M 18704 R 105. 0.7 0:07.51 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26000 samzapo 20 0 681M 634M 18532 R 105. 1.0 0:07.35 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26008 samzapo 20 0 611M 564M 18532 R 105. 0.9 0:06.73 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26016 samzapo 20 0 582M 508M 18656 R 105. 0.8 0:06.08 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26089 samzapo 20 0 409M 363M 18328 R 105. 0.6 0:03.92 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26097 samzapo 20 0 436M 344M 18356 R 105. 0.5 0:03.17 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26127 samzapo 20 0 331M 305M 17996 R 105. 0.5 0:03.00 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26208 samzapo 20 0 308M 208M 9044 R 105. 0.3 0:01.51 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -quiet -I /home/samzapo/Develop
26212 samzapo 20 0 129M 120M 4320 R 105. 0.2 0:00.56 htop
我的调度程序出了什么问题？我该如何修复它？
一些附加信息：
$ uname -a
Linux <hostname> 5.15.0-88-generic #98-Ubuntu SMP Mon Oct 2 15:18:56 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.3 LTS
Release: 22.04
Codename: jammy
我/etc/default/grub在上面的例子中隔离了几个 CPU：
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=0,1,2,3,4,5,6,7,8"