我有以下问题与Debian 7（LAMP堆栈）：
top - 12:16:08 up 16:36, 4 users, load average: 27.97, 27.66, 27.42 Tasks: 240 total, 2 running, 238 sleeping, 0 stopped, 0 zombie %Cpu(s): 8.5 us, 3.3 sy, 86.8 ni, 1.0 id, 0.0 wa, 0.0 hi, 0.4 si, 0.0 st KiB Mem: 32980448 total, 32278828 used, 701620 free, 264368 buffers KiB Swap: 11882492 total, 0 used, 11882492 free, 29265456 cached 因此，即使所有的服务（http，postfix，bind）都closures了（同时networking也被iptables完全阻塞了），所以加载平均值为24。 它接近100％的好负载和〜27 la，但运行过程只有3-5。 网站工作，但现在是空闲的。
任何想法可能是什么？ 我如何确定哪些进程正在运行“nice”？
BTW服务器有12个核心，总共是24线程…它可能是错误，每个核心是“挂”
更新进程列表：
top - 12:29:46 up 16:49, 3 users, load average: 27.55, 27.30, 27.35 Tasks: 234 total, 4 running, 229 sleeping, 0 stopped, 1 zombie %Cpu(s): 10.1 us, 4.2 sy, 84.5 ni, 0.7 id, 0.0 wa, 0.0 hi, 0.4 si, 0.0 st KiB Mem: 32980448 total, 32363708 used, 616740 free, 266392 buffers KiB Swap: 11882492 total, 0 used, 11882492 free, 29357760 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 17760 mysql 20 0 2278m 972m 8544 S 71 3.0 330:59.07 mysqld 31139 www-data 20 0 81896 4524 2076 S 4 0.0 4:27.55 nginx 31140 www-data 20 0 81776 3256 1064 R 3 0.0 4:23.99 nginx 52110 web12543 20 0 240m 14m 3328 R 3 0.0 0:00.09 apache2 33669 root 20 0 236m 7484 580 S 1 0.0 0:01.18 apache2 40600 root 20 0 236m 7484 580 S 1 0.0 0:00.76 apache2 43386 root 20 0 236m 7484 580 S 1 0.0 0:00.57 apache2 43645 root 20 0 236m 7480 576 S 1 0.0 0:00.54 apache2 44197 root 20 0 236m 7484 580 S 1 0.0 0:00.49 apache2 46111 root 20 0 236m 7480 576 S 1 0.0 0:00.38 apache2 47041 root 20 0 236m 7480 576 S 1 0.0 0:00.33 apache2 47644 root 20 0 236m 7480 576 S 1 0.0 0:00.28 apache2 48683 root 20 0 0 0 0 Z 1 0.0 0:00.23 apache2 48765 root 20 0 236m 7480 576 S 1 0.0 0:00.23 apache2 49749 root 20 0 236m 7480 576 S 1 0.0 0:00.14 apache2 49833 root 20 0 236m 7480 576 S 1 0.0 0:00.14 apache2 49931 root 20 0 236m 7480 576 S 1 0.0 0:00.13 apache2 49935 root 20 0 236m 7480 576 R 1 0.0 0:00.12 apache2 50691 root 20 0 236m 7480 576 S 1 0.0 0:00.09 apache2 50692 root 20 0 236m 7480 576 S 1 0.0 0:00.08 apache2 50786 root 20 0 236m 7480 576 S 1 0.0 0:00.08 apache2 50787 root 20 0 236m 7484 580 S 1 0.0 0:00.07 apache2 51487 root 20 0 236m 7480 576 S 1 0.0 0:00.04 apache2 51588 root 20 0 25320 1584 1080 R 1 0.0 0:00.05 top 31138 www-data 20 0 81824 3436 1064 S 0 0.0 4:18.99 nginx 45688 root 20 0 236m 7480 576 S 0 0.0 0:00.42 apache2 46535 root 20 0 236m 7480 576 S 0 0.0 0:00.35 apache2 46869 root 20 0 236m 7480 576 S 0 0.0 0:00.34 apache2 49933 root 20 0 236m 7480 576 S 0 0.0 0:00.12 apache2 49934 root 20 0 236m 7480 576 S 0 0.0 0:00.12 apache2 51311 root 20 0 236m 7480 576 S 0 0.0 0:00.03 apache2 52085 web12543 20 0 237m 11m 3272 S 0 0.0 0:00.01 apache2 62551 root 20 0 25492 1864 1192 S 0 0.0 0:07.21 top 1 root 20 0 12708 844 704 S 0 0.0 0:04.20 init 2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0 0.0 0:00.92 ksoftirqd/0 5 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/u:0 6 root rt 0 0 0 0 S 0 0.0 0:00.38 migration/0 7 root rt 0 0 0 0 S 0 0.0 0:00.30 watchdog/0 8 root rt 0 0 0 0 S 0 0.0 0:00.20 migration/1 9 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/1:0 10 root 20 0 0 0 0 S 0 0.0 0:00.26 ksoftirqd/1 12 root rt 0 0 0 0 S 0 0.0 0:00.21 watchdog/1 13 root rt 0 0 0 0 S 0 0.0 0:00.19 migration/2 14 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/2:0 15 root 20 0 0 0 0 S 0 0.0 0:00.24 ksoftirqd/2 16 root rt 0 0 0 0 S 0 0.0 0:00.16 watchdog/2 17 root rt 0 0 0 0 S 0 0.0 0:00.14 migration/3 18 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/3:0 19 root 20 0 0 0 0 S 0 0.0 0:00.18 ksoftirqd/3 20 root rt 0 0 0 0 S 0 0.0 0:00.13 watchdog/3 21 root rt 0 0 0 0 S 0 0.0 0:00.14 migration/4 23 root 20 0 0 0 0 S 0 0.0 0:00.22 ksoftirqd/4 24 root rt 0 0 0 0 S 0 0.0 0:00.13 watchdog/4 25 root rt 0 0 0 0 S 0 0.0 0:00.14 migration/5 26 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/5:0 27 root 20 0 0 0 0 S 0 0.0 0:00.25 ksoftirqd/5 28 root rt 0 0 0 0 S 0 0.0 0:00.12 watchdog/5 29 root rt 0 0 0 0 S 0 0.0 0:00.32 migration/6 31 root 20 0 0 0 0 S 0 0.0 0:00.79 ksoftirqd/6 32 root rt 0 0 0 0 S 0 0.0 0:00.15 watchdog/6 33 root rt 0 0 0 0 S 0 0.0 0:00.27 migration/7 34 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/7:0 35 root 20 0 0 0 0 S 0 0.0 0:00.28 ksoftirqd/7 36 root rt 0 0 0 0 S 0 0.0 0:00.15 watchdog/7 37 root rt 0 0 0 0 S 0 0.0 0:00.19 migration/8 39 root 20 0 0 0 0 S 0 0.0 0:00.25 ksoftirqd/8 40 root rt 0 0 0 0 S 0 0.0 0:00.16 watchdog/8 41 root rt 0 0 0 0 S 0 0.0 0:00.18 migration/9 43 root 20 0 0 0 0 S 0 0.0 0:00.28 ksoftirqd/9 44 root rt 0 0 0 0 S 0 0.0 0:00.16 watchdog/9 45 root rt 0 0 0 0 S 0 0.0 0:00.19 migration/10 46 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/10:0 47 root 20 0 0 0 0 S 0 0.0 0:00.21 ksoftirqd/10 48 root rt 0 0 0 0 S 0 0.0 0:00.16 watchdog/10 49 root rt 0 0 0 0 S 0 0.0 0:00.16 migration/11 50 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/11:0 51 root 20 0 0 0 0 S 0 0.0 0:00.18 ksoftirqd/11 52 root rt 0 0 0 0 S 0 0.0 0:00.16 watchdog/11 53 root rt 0 0 0 0 S 0 0.0 0:00.44 migration/12 54 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/12:0 55 root 20 0 0 0 0 S 0 0.0 0:00.10 ksoftirqd/12 56 root rt 0 0 0 0 S 0 0.0 0:00.12 watchdog/12 57 root rt 0 0 0 0 S 0 0.0 0:00.35 migration/13 59 root 20 0 0 0 0 S 0 0.0 0:00.08 ksoftirqd/13 60 root rt 0 0 0 0 S 0 0.0 0:00.12 watchdog/13 61 root rt 0 0 0 0 S 0 0.0 0:00.28 migration/14 62 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/14:0 63 root 20 0 0 0 0 S 0 0.0 0:00.10 ksoftirqd/14 64 root rt 0 0 0 0 S 0 0.0 0:00.11 watchdog/14 65 root rt 0 0 0 0 S 0 0.0 0:00.24 migration/15 66 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/15:0 67 root 20 0 0 0 0 S 0 0.0 0:00.05 ksoftirqd/15 68 root rt 0 0 0 0 S 0 0.0 0:00.11 watchdog/15 69 root rt 0 0 0 0 S 0 0.0 0:00.23 migration/16 70 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/16:0 71 root 20 0 0 0 0 S 0 0.0 0:00.07 ksoftirqd/16 72 root rt 0 0 0 0 S 0 0.0 0:00.11 watchdog/16 73 root rt 0 0 0 0 S 0 0.0 0:00.21 migration/17 74 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/17:0 75 root 20 0 0 0 0 S 0 0.0 0:00.11 ksoftirqd/17 76 root 20 0 0 0 0 S 0 0.0 0:04.63 kworker/8:1 79 root 20 0 0 0 0 S 0 0.0 0:04.42 kworker/5:1 80 root 20 0 0 0 0 S 0 0.0 0:04.36 kworker/4:1 81 root 20 0 0 0 0 S 0 0.0 0:04.20 kworker/3:1 82 root 20 0 0 0 0 S 0 0.0 0:04.33 kworker/2:1 83 root rt 0 0 0 0 S 0 0.0 0:00.12 watchdog/17 84 root rt 0 0 0 0 S 0 0.0 0:00.53 migration/18 85 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/18:0 86 root 20 0 0 0 0 S 0 0.0 0:00.06 ksoftirqd/18 87 root 20 0 0 0 0 S 0 0.0 0:06.01 kworker/1:1 88 root rt 0 0 0 0 S 0 0.0 0:00.14 watchdog/18 89 root rt 0 0 0 0 S 0 0.0 0:00.41 migration/19 91 root 20 0 0 0 0 S 0 0.0 0:00.08 ksoftirqd/19 92 root rt 0 0 0 0 S 0 0.0 0:00.17 watchdog/19 93 root rt 0 0 0 0 S 0 0.0 0:00.34 migration/20 94 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/20:0 95 root 20 0 0 0 0 S 0 0.0 0:00.06 ksoftirqd/20 96 root rt 0 0 0 0 S 0 0.0 0:00.14 watchdog/20 97 root rt 0 0 0 0 S 0 0.0 0:00.30 migration/21 98 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/21:0 99 root 20 0 0 0 0 S 0 0.0 0:00.12 ksoftirqd/21 100 root rt 0 0 0 0 S 0 0.0 0:00.14 watchdog/21 101 root rt 0 0 0 0 S 0 0.0 0:00.28 migration/22 102 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/22:0 103 root 20 0 0 0 0 S 0 0.0 0:00.06 ksoftirqd/22 104 root rt 0 0 0 0 S 0 0.0 0:00.14 watchdog/22 105 root rt 0 0 0 0 S 0 0.0 0:00.26 migration/23 106 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/23:0 107 root 20 0 0 0 0 S 0 0.0 0:00.07 ksoftirqd/23 108 root rt 0 0 0 0 S 0 0.0 0:00.14 watchdog/23 109 root 0 -20 0 0 0 S 0 0.0 0:00.00 cpuset 110 root 0 -20 0 0 0 S 0 0.0 0:00.00 khelper 111 root 20 0 0 0 0 S 0 0.0 0:00.00 kdevtmpfs 112 root 0 -20 0 0 0 S 0 0.0 0:00.00 netns 113 root 20 0 0 0 0 S 0 0.0 0:00.14 sync_supers 114 root 20 0 0 0 0 S 0 0.0 0:00.00 bdi-default 115 root 0 -20 0 0 0 S 0 0.0 0:00.00 kintegrityd 116 root 0 -20 0 0 0 S 0 0.0 0:00.00 kblockd 117 root 20 0 0 0 0 S 0 0.0 0:00.06 khungtaskd 118 root 20 0 0 0 0 S 0 0.0 0:06.12 kswapd0 119 root 20 0 0 0 0 S 0 0.0 0:04.55 kswapd1 120 root 25 5 0 0 0 S 0 0.0 0:00.00 ksmd 121 root 39 19 0 0 0 S 0 0.0 0:00.00 khugepaged 122 root 20 0 0 0 0 S 0 0.0 0:00.00 fsnotify_mark 123 root 0 -20 0 0 0 S 0 0.0 0:00.00 crypto 126 root 20 0 0 0 0 S 0 0.0 0:04.37 kworker/15:1 129 root 20 0 0 0 0 S 0 0.0 0:04.41 kworker/13:1 145 root 20 0 0 0 0 S 0 0.0 0:04.76 kworker/9:1 190 root 20 0 0 0 0 S 0 0.0 0:04.60 kworker/12:1 191 root 20 0 0 0 0 S 0 0.0 0:04.40 kworker/17:1 192 root 20 0 0 0 0 S 0 0.0 0:04.19 kworker/16:1 193 root 20 0 0 0 0 S 0 0.0 0:04.84 kworker/11:1 194 root 20 0 0 0 0 S 0 0.0 0:04.80 kworker/10:1 376 root 0 -20 0 0 0 S 0 0.0 0:00.00 ata_sff 377 root 20 0 0 0 0 S 0 0.0 0:00.00 khubd 461 root 20 0 0 0 0 S 0 0.0 0:00.00 scsi_eh_0 463 root 20 0 0 0 0 S 0 0.0 0:00.02 hpsa 467 root 20 0 0 0 0 S 0 0.0 0:00.97 kworker/u:1 476 root 20 0 0 0 0 S 0 0.0 0:00.00 scsi_eh_1 477 root 20 0 0 0 0 S 0 0.0 0:00.00 scsi_eh_2 480 root 20 0 0 0 0 S 0 0.0 0:04.88 kworker/23:1 481 root 20 0 0 0 0 S 0 0.0 0:04.76 kworker/19:1 484 root 20 0 0 0 0 S 0 0.0 0:04.81 kworker/18:1 486 root 20 0 0 0 0 S 0 0.0 0:04.75 kworker/20:1 489 root 20 0 0 0 0 S 0 0.0 0:04.75 kworker/22:1 497 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/19:2 507 root 20 0 0 0 0 S 0 0.0 0:04.85 kworker/21:1 508 root 0 -20 0 0 0 S 0 0.0 0:00.00 kdmflush 517 root 0 -20 0 0 0 S 0 0.0 0:00.00 kdmflush 524 root 20 0 0 0 0 S 0 0.0 0:04.36 kworker/14:2 533 root 20 0 0 0 0 S 0 0.0 0:29.16 jbd2/dm-0-8 534 root 0 -20 0 0 0 S 0 0.0 0:00.00 ext4-dio-unwrit 675 root 20 0 23772 1692 816 S 0 0.0 0:00.16 udevd 1008 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/4:2 1075 root 0 -20 0 0 0 S 0 0.0 0:00.00 edac-poller 1080 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/8:2 1081 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/9:2 1099 root 0 -20 0 0 0 S 0 0.0 0:00.00 kpsmoused 2291 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/13:2 2637 root 20 0 0 0 0 S 0 0.0 0:44.75 flush-254:0 2730 root 20 0 118m 2348 1152 S 0 0.0 0:05.10 rsyslogd 2782 daemon 20 0 18736 368 208 S 0 0.0 0:00.00 atd 2851 root 20 0 8240 684 528 S 0 0.0 0:00.01 acpid 2878 messageb 20 0 31864 488 220 S 0 0.0 0:00.00 dbus-daemon 2923 root 20 0 51992 1308 688 S 0 0.0 0:00.00 sshd 3557 root 20 0 22468 1112 832 S 0 0.0 0:00.67 cron 3627 root 20 0 23584 1004 676 S 0 0.0 0:00.27 dovecot 3782 dovecot 20 0 15244 1068 884 S 0 0.0 0:00.10 anvil 3783 root 20 0 15240 1248 904 S 0 0.0 0:00.06 log 3830 root 20 0 53648 9912 2120 S 0 0.0 0:04.89 munin-node 4399 root 20 0 39248 2628 1860 S 0 0.0 0:00.22 ihttpd 4450 root 20 0 54220 1568 1164 S 0 0.0 0:00.02 login 4451 root 20 0 20384 992 816 S 0 0.0 0:00.00 getty 4452 root 20 0 20384 988 816 S 0 0.0 0:00.00 getty 4453 root 20 0 20384 988 816 S 0 0.0 0:00.00 getty 4454 root 20 0 20384 992 816 S 0 0.0 0:00.00 getty 4455 root 20 0 20384 988 816 S 0 0.0 0:00.00 getty 5721 web12542 20 0 237m 9860 2368 S 0 0.0 0:00.00 apache2 5724 mysql 20 0 2011m 649m 256 S 0 2.0 0:00.00 mysqld 17427 root 20 0 8304 776 628 S 0 0.0 0:00.02 mysqld_safe 23825 postfix 20 0 42008 2476 1904 S 0 0.0 0:00.01 pickup 28501 root 20 0 0 0 0 S 0 0.0 0:04.18 kworker/0:0 28689 root 20 0 23348 1080 552 S 0 0.0 0:00.00 udevd 31059 root 20 0 39944 2520 1944 S 0 0.0 0:00.75 master 31073 postfix 20 0 42592 3188 2032 S 0 0.0 0:00.94 qmgr 31093 root 20 0 236m 12m 5952 S 0 0.0 0:14.22 apache2 31137 root 20 0 81476 1836 336 S 0 0.0 0:00.00 nginx 31141 www-data 20 0 81900 3512 1064 S 0 0.0 3:47.78 nginx 31878 root 20 0 0 0 0 S 0 0.0 0:05.02 kworker/0:1 32472 postfix 20 0 42008 2364 1824 S 0 0.0 0:00.00 anvil 35437 postfix 20 0 45116 3864 2508 S 0 0.0 0:00.49 tlsmgr 35880 root 20 0 206m 12m 8804 S 0 0.0 0:09.27 ispmgr 37067 postfix 20 0 46828 4368 3316 S 0 0.0 0:00.01 smtp 44298 postfix 20 0 66532 5152 3496 S 0 0.0 0:00.01 smtpd 48002 postfix 20 0 42004 2368 1828 S 0 0.0 0:00.00 error 48004 postfix 20 0 42040 2380 1840 S 0 0.0 0:00.00 bounce 48972 root 20 0 236m 7480 576 S 0 0.0 0:00.12 apache2 48975 root 20 0 74876 5152 2940 S 0 0.0 0:00.82 sshd 49288 root 20 0 0 0 0 S 0 0.0 0:04.01 kworker/7:1 49471 root 20 0 21636 2384 1724 S 0 0.0 0:00.31 bash 50882 web12542 20 0 242m 16m 3140 S 0 0.1 0:06.45 apache2 51111 bind 20 0 332m 55m 2352 S 0 0.2 0:04.50 named 52083 web12543 20 0 236m 9228 2004 S 0 0.0 0:00.00 apache2 52114 root 20 0 0 0 0 S 0 0.0 0:00.15 kworker/6:2 54542 root 20 0 236m 7480 576 S 0 0.0 0:00.10 apache2 55209 postfix 20 0 42020 2388 1844 S 0 0.0 0:00.02 trivial-rewrite 56098 postfix 20 0 42340 3180 2352 S 0 0.0 0:00.03 cleanup 56171 web12542 20 0 240m 14m 3300 S 0 0.0 0:00.08 apache2 56214 root 20 0 23348 1124 584 S 0 0.0 0:00.00 udevd 56218 root 20 0 21560 2248 1648 S 0 0.0 0:00.01 bash 56282 root 20 0 73352 3732 2936 S 0 0.0 0:00.48 sshd 61268 root 20 0 21544 2280 1696 S 0 0.0 0:00.04 bash 63955 root 20 0 0 0 0 S 0 0.0 0:01.36 kworker/6:0
UPDATE2现在2天后，平均显示0.00 – 总是！
top - 10:57:06 up 2 days, 15:17, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 377 total, 10 running, 366 sleeping, 0 stopped, 1 zombie Cpu(s): 29.1%us, 11.8%sy, 57.9%ni, 0.2%id, 0.0%wa, 0.0%hi, 0.9%si, 0.0%st Mem: 32980448k total, 31662152k used, 1318296k free, 293472k buffers Swap: 11882492k total, 744k used, 11881748k free, 25885360k cached
Debian的bug？
UPDATE3
root@rd1:~# vmstat 1 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- rb swpd free buff cache si so bi bo in cs us sy id wa 40 0 2076 1233156 294124 25595008 0 0 26 35 0 6 94 5 1 0 29 0 2076 1240300 294124 25595200 0 0 0 428 22645 61952 86 14 0 0 28 0 2076 1233792 294124 25595456 0 0 36 364 12324 23591 92 8 0 0 34 0 2076 1251060 294124 25595608 0 0 0 556 13593 33874 91 8 1 0 39 0 2076 1223912 294124 25595752 0 0 0 2332 38084 89618 81 19 0 0 35 0 2076 1205256 294124 25595960 0 0 0 556 25791 62903 81 18 0 0 27 0 2076 1238748 294124 25596768 0 0 0 344 20367 46819 84 16 1 0 35 0 2076 1211688 294124 25597256 0 0 32 484 13068 28677 87 12 1 0 35 0 2076 1216440 294124 25597800 0 0 32 132 26783 75160 81 19 0 0 38 0 2076 1218932 294124 25598188 0 0 64 6952 19746 47230 83 16 0 0 30 0 2076 1244800 294124 25598728 0 0 0 4 16268 35489 87 13 0 0 33 0 2076 1229928 294124 25599048 0 0 184 404 10958 21926 88 11 1 0 30 0 2076 1237536 294124 25599436 0 0 32 592 12408 29603 89 11 0 0 30 1 2076 1234664 294124 25599788 0 0 12 416 13072 31855 88 12 0 0 32 0 2076 1247136 294124 25599924 0 0 12 1928 12717 23503 88 11 1 0 31 0 2076 1236484 294124 25600312 0 0 32 2880 12893 33544 88 12 0 0