我遇到了一个非常奇怪的间歇性问题。它发生在运行 CentOS 和 Apache/2.2.8 的共享托管服务器上，主要以每秒 10 - 30 个请求的速度为基于 PHP 的网站提供服务。3.5 GB RAM，内核 2.6.9-67.0.7ELsmp（以防万一）。
发生的事情是，大约每周一次（但似乎是随机的，没有相关性）apache 会在处理仅一个域的请求时“堵塞”，并且通常大多数重新测试都是针对同一个 URL。我知道问题发生是因为负载过高。（负载达到 50 或 100，如果我不停止它，负载会达到 200！）我发现的唯一修复方法是：killall -9 httpd; /etc/init.d/httpd restart。
如果发生这种情况时我检查 /server-status，则输出类似于以下内容。请注意，它没有总是发生在这个网站上，但大约 75% 的时间这个网站是罪魁祸首：编辑：这件事现在发生在一个完全不同的服务器上，所以它并不特定于某个脚本。
更新：我们已将此服务器上的所有网站移至全新虚拟机在全新硬件上。更快的磁盘，更多的 RAM。问题仍然存在，事实上甚至更糟！有什么想法吗？我很乐意为正确答案提供巨额赏金，但我不愿意真正提供，因为这个问题已经过去好几年了，还没有看到正确的答案。
Apache Server Status for localhost
Server Version: Apache/2.2.8 (Unix) mod_ssl/2.2.8 OpenSSL/0.9.7a DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 PHP/5.2.6 mod_perl/2.0.4 Perl/v5.8.8
Server Built: Jun 7 2008 09:35:37
Current Time: Friday, 17-Jul-2009 10:15:40 EDT
Restart Time: Friday, 03-Jul-2009 12:36:59 EDT
Parent Server Generation: 3
Server uptime: 13 days 21 hours 38 minutes 40 seconds
Total accesses: 10343186 - Total Traffic: 111.6 GB
CPU Usage: u1710.63 s2129.19 cu.41 cs0 - .32% CPU load
8.61 requests/sec - 97.4 kB/second - 11.3 kB/request
250 requests currently being processed, 0 idle workers
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWKWWWWWWWWWWWWWWWWWW......
Scoreboard Key:
"_" Waiting for Connection, "S" Starting up, "R" Reading Request,
"W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
"C" Closing connection, "L" Logging, "G" Gracefully finishing,
"I" Idle cleanup of worker, "." Open slot with no current process
Srv PID Acc M CPU SS Req Conn Child Slot Client VHost Request
0-3 3282 0/52/316180 W 1.47 41802 0 0.0 0.54 3849.21 209.249.53.104 zachdotsey.com GET /wordpress/2007/08/18/the-body-exhibition/ HTTP/1.0
1-3 30061 0/191/313974 W 34.46 44051 0 0.0 2.62 3400.19 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
2-3 2720 1/23/307812 W 0.13 42298 0 0.5 0.01 3479.29 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
3-3 1733 0/382/306392 W 3.59 41744 0 0.0 3.67 3383.63 75.101.200.204 zachdotsey.com GET /wordpress/2007/08/18/the-body-exhibition/ HTTP/1.0
4-3 3141 0/132/305071 W 3.52 41776 0 0.0 2.20 3335.79 209.249.53.236 zachdotsey.com GET /wordpress/2007/08/18/the-body-exhibition/ HTTP/1.0
5-3 31819 0/73/300070 W 0.79 43932 0 0.0 2.05 3349.65 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
6-3 6799 0/13/294060 W 0.16 40354 0 0.0 0.25 3261.88 76.23.230.184 zachdotsey.com GET /wordpress/?p=111 HTTP/1.1
7-3 4334 0/92/289873 W 0.42 40277 0 0.0 0.36 3211.94 72.233.56.144 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
8-3 18326 0/11/294687 W 0.14 32476 0 0.0 0.06 3217.41 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
9-3 2451 0/56/291730 W 0.23 42381 0 0.0 0.32 3113.19 68.118.8.157 zachdotsey.com GET /wordpress/index.php HTTP/1.1
10-3 31211 0/59/280899 W 6.04 44051 0 0.0 0.77 3128.00 72.52.238.128 zachdotsey.com POST /wordpress/wp-cron.php?doing_wp_cron HTTP/1.0
11-3 3823 0/4/277229 W 0.17 41746 0 0.0 0.04 3014.66 68.118.8.157 zachdotsey.com GET /wordpress/index.php HTTP/1.1
12-3 4473 0/9/277074 W 0.08 38453 0 0.0 0.00 3313.94 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
13-3 4242 1/14/272166 W 0.10 41659 0 0.5 0.05 2977.05 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
14-3 2323 0/234/269513 W 0.84 42136 0 0.0 1.02 2946.48 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
15-3 32051 0/6/257740 W 0.08 43872 0 0.0 0.58 2866.34 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
16-3 16986 0/271/259463 W 18.13 16761 0 0.0 4.12 2896.05 74.6.18.233 zachdotsey.com GET /wordpress/tag/xbox/ HTTP/1.0
17-3 2297 1/8/252501 W 0.54 42502 0 0.5 0.18 2797.73 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
18-3 9476 1/145/247116 W 0.61 40095 0 0.4 1.53 2703.11 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
19-3 2494 0/214/244830 W 3.16 42017 0 0.0 2.40 2618.41 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
20-3 5526 0/118/238426 W 3.50 37656 0 0.0 1.73 2544.06 68.10.212.178 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
21-3 31901 0/28/228757 W 0.14 43992 0 0.0 0.04 2522.36 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
22-3 12398 0/25/216141 W 0.40 39998 0 0.0 4.72 2398.82 38.117.108.131 zachdotsey.com GET /wordpress/ HTTP/1.1
23-3 2300 0/187/222141 W 0.68 42315 0 0.0 0.67 2503.15 65.184.161.115 zachdotsey.com GET /wordpress/ HTTP/1.1
24-3 31969 0/25/211848 W 0.26 43810 0 0.0 0.38 2326.01 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
25-3 31582 0/25/198495 W 0.17 69010 0 0.0 0.25 2139.13 70.63.195.121 myvenue.venuecom.com POST /fastmail/ HTTP/1.1
26-3 28115 1/1/197089 W 0.04 40155 0 0.4 0.00 2126.75 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
27-3 12988 1/42/186898 W 0.55 35055 0 2.1 0.36 2037.54 71.193.156.250 zachdotsey.com GET /wordpress/ HTTP/1.1
28-3 3780 1/26/181659 W 0.34 41662 0 0.5 0.05 1918.00 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
29-3 1002 0/22/169331 W 0.18 39885 0 0.0 0.03 1888.59 64.40.121.190 zachdotsey.com GET /robots.txt HTTP/1.0
30-3 4493 0/6/163101 W 0.06 41465 0 0.0 0.18 1732.58 209.131.41.49 zachdotsey.com GET /wordpress/feed/ HTTP/1.0
31-3 32458 0/1/162852 W 0.04 43750 0 0.0 0.01 1758.80 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
32-3 14198 0/571/157504 W 47.36 32680 0 0.0 8.64 1733.04 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
33-3 2213 0/9/152830 W 0.32 42624 0 0.0 0.00 1782.36 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
34-3 2308 0/1/137395 W 0.06 39398 0 0.0 0.00 1433.25 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
35-3 6984 0/123/127498 W 1.88 40241 0 0.0 0.18 1350.38 206.196.125.113 zachdotsey.com GET /wordpress/?feed=rss2 HTTP/1.1
36-3 1003 0/21/116316 W 0.81 39874 0 0.0 1.15 1216.35 67.202.60.246 zachdotsey.com GET /wordpress/ HTTP/1.1
37-3 3025 0/19/106816 W 0.16 42196 0 0.0 0.28 1096.76 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
38-3 4250 1/15/101047 W 0.09 41660 0 0.5 0.01 1198.01 68.118.8.157 zachdotsey.com GET /wordpress/ HTTP/1.1
39-3 3073 0/73/91871 W 2.32 41891 0 0.0 1.81 924.03 68.118.8.157 zachdotsey.com GET /wordpress/index.php HTTP/1.1
40-3 2133 0/15/86368 W 0.20 39445 0 0.0 0.09 888.41 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
41-3 2803 0/93/79858 W 0.67 39020 0 0.0 0.69 877.38 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
42-3 3030 0/165/72532 W 35.08 41532 0 0.0 2.17 777.91 65.184.161.115 zachdotsey.com GET /wordpress/?feed=rss2 HTTP/1.1
43-3 13566 0/427/68292 W 14.81 33263 0 0.0 6.28 682.48 174.129.193.94 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
44-3 31951 0/6/65523 W 0.39 43980 0 0.0 0.15 624.37 78.31.110.126 zachdotsey.com GET /wordpress/feed HTTP/1.1
45-3 17775 0/4/64507 W 0.11 32768 0 0.0 0.00 666.08 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
46-3 17485 0/280/61533 W 30.17 16250 0 0.0 6.34 655.87 77.88.42.26 zachdotsey.com GET /robots.txt HTTP/1.1
47-3 1379 0/305/51058 W 2.50 42256 0 0.0 5.02 691.25 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
48-3 15264 0/28/49621 W 0.11 33958 0 0.0 0.02 527.41 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
49-3 20544 1/28/48765 W 1.55 40125 0 0.4 0.17 516.42 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
50-3 14318 0/408/50772 W 26.77 32722 0 0.0 7.28 509.18 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
51-3 2258 0/18/45699 W 0.08 39388 0 0.0 0.01 456.81 64.40.121.190 zachdotsey.com GET /robots.txt HTTP/1.0
52-3 3039 0/21/37675 W 0.38 42077 0 0.0 1.58 442.82 65.184.161.115 zachdotsey.com POST /wordpress/wp-admin/admin-ajax.php HTTP/1.1
53-3 2747 0/3/35053 W 0.06 39268 0 0.0 0.22 371.79 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
54-3 17408 0/22/35784 W 0.26 32871 0 0.0 0.42 367.04 74.6.18.233 zachdotsey.com GET /robots.txt HTTP/1.0
55-3 4511 0/6/29200 W 0.40 41444 0 0.0 0.23 375.89 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
56-3 5534 0/54/27466 W 2.63 37695 0 0.0 0.38 305.27 68.10.212.178 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
57-3 23760 0/41/20806 W 0.23 40553 0 0.0 0.33 219.16 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
58-3 5638 0/247/17586 W 2.79 40174 0 0.0 2.66 182.34 64.237.119.18 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
59-3 31783 0/5/18112 W 0.05 40067 0 0.0 0.06 182.11 65.113.57.7 zachdotsey.com GET /wordpress/feed/ HTTP/1.0
60-3 2319 0/1/13920 W 0.03 39391 0 0.0 0.00 145.61 38.117.108.131 zachdotsey.com GET /wordpress/ HTTP/1.1
61-3 23730 0/155/12935 W 29.86 28181 0 0.0 3.25 153.35 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
62-3 12586 0/25/12506 W 0.14 40271 0 0.0 0.09 135.23 72.233.56.156 zachdotsey.com GET /wordpress/ HTTP/1.1
63-3 13567 0/15/10439 W 0.54 34975 0 0.0 0.10 137.24 84.217.7.221 zachdotsey.com GET /wordpress/2009/06/06/emergency-baby-call-tests/ HTTP/1.1
64-3 17776 1/161/10534 W 1.65 31758 0 0.4 2.14 128.33 208.92.218.250 zachdotsey.com GET /wordpress/ HTTP/1.1
65-3 3053 0/159/7939 W 7.25 41485 0 0.0 2.64 74.76 209.131.41.48 zachdotsey.com GET /robots.txt HTTP/1.0
66-3 5056 0/115/6934 W 1.56 37848 0 0.0 2.43 81.76 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
67-3 16535 0/160/6199 W 19.57 39641 0 0.0 2.57 67.22 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
68-3 17777 0/37/7722 W 0.24 32569 0 0.0 0.15 93.77 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
69-3 2355 0/2/5737 W 0.15 39346 0 0.0 0.03 73.54 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
70-3 10432 0/24/5080 W 0.33 36392 0 0.0 0.47 45.89 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
71-3 10433 0/12/4099 W 0.93 36365 0 0.0 0.65 41.80 68.7.141.144 zachdotsey.com GET /wordpress/2006/12/18/the-plastic-coating-on-the-end-of-a-s
72-3 6145 0/114/4835 W 12.61 37285 0 0.0 1.49 57.55 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
73-3 5539 0/71/4717 W 5.37 37680 0 0.0 1.63 62.39 68.10.212.178 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
74-3 17690 0/38/5004 W 0.12 32810 0 0.0 0.25 46.34 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
75-3 1528 0/38/3991 W 0.14 39764 0 0.0 0.08 41.91 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
76-3 2751 0/26/2886 W 0.22 39144 0 0.0 0.63 25.56 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
77-3 5453 0/95/6939 W 1.95 21796 0 0.0 1.09 87.49 69.147.79.37 zachdotsey.com GET /robots.txt HTTP/1.0
78-3 5061 0/192/3238 W 9.87 37110 0 0.0 2.13 39.70 78.31.110.126 zachdotsey.com GET /wordpress/feed HTTP/1.1
79-3 9955 0/143/4659 W 11.55 35985 0 0.0 7.35 64.53 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
80-3 17779 0/29/4181 W 0.33 32548 0 0.0 0.47 48.11 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
81-3 1192 0/74/2861 W 0.54 39651 0 0.0 0.42 27.09 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
82-3 13108 0/42/4116 W 0.13 35144 0 0.0 0.10 37.39 71.193.156.250 zachdotsey.com GET /wordpress/wp-login.php?loggedout=true HTTP/1.1
83-3 32180 0/0/6535 W 0.98 10753 0 0.0 0.00 105.04 142.166.3.122 zachdotsey.com GET /robots.txt HTTP/1.1
84-3 24479 0/148/4080 W 98.02 28139 0 0.0 3.46 60.62 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
85-3 776 1/204/8349 W 40.83 9214 0 0.4 3.57 99.11 64.237.119.18 zachdotsey.com GET /wordpress/ HTTP/1.1
86-3 13569 0/25/3218 W 10.53 34863 0 0.0 0.29 28.96 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
87-3 13110 0/2/2535 W 0.09 35187 0 0.0 0.00 26.16 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
88-3 4716 0/157/2237 W 3.75 37444 0 0.0 3.58 25.28 206.196.125.113 zachdotsey.com GET /wordpress/?feed=rss2 HTTP/1.1
89-3 19878 0/110/2928 W 10.39 31357 0 0.0 0.54 26.66 58.61.164.39 zachdotsey.com GET /robots.txt HTTP/1.1
90-3 2003 0/28/1847 W 1.81 39519 0 0.0 0.39 19.10 64.40.121.190 zachdotsey.com GET /wordpress/ HTTP/1.0
91-3 13570 0/0/1928 W 10.59 35116 0 0.0 0.00 23.59 71.193.156.250 zachdotsey.com GET /wordpress/ HTTP/1.1
92-3 16358 0/282/1910 W 33.11 32280 0 0.0 5.57 26.53 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
93-3 16367 0/50/1664 W 10.03 33243 0 0.0 0.88 17.62 174.129.193.94 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
94-3 25642 0/82/2391 W 19.24 28268 0 0.0 2.07 34.95 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
95-3 24480 0/261/2711 W 31.22 27528 0 0.0 3.14 43.29 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
96-3 17692 0/514/1024 W 46.55 30965 0 0.0 6.50 14.37 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
97-3 10442 0/126/1041 W 1.25 35891 0 0.0 1.20 8.47 203.171.91.144 zachdotsey.com GET /wordpress/2009/07/15/andre-dawkins-to-duke-a-year-early/ H
98-3 25643 0/103/1705 W 0.67 28008 0 0.0 2.83 20.89 74.6.18.233 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
99-3 22619 0/338/1657 W 27.38 28329 0 0.0 4.00 27.55 72.30.161.222 zachdotsey.com GET /robots.txt HTTP/1.0
100-3 19714 0/0/1845 W 12.66 31778 0 0.0 0.00 22.14 208.92.218.250 zachdotsey.com GET /wordpress/feed/ HTTP/1.1
101-3 19367 1/155/1983 W 10.76 31728 0 0.4 0.15 23.66 208.92.218.250 zachdotsey.com GET /wordpress/ HTTP/1.1
102-3 26652 0/122/1187 W 41.42 26872 0 0.0 3.00 14.95 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
103-3 7280 3/361/1639 W 12.44 35165 0 8.9 4.80 17.06 71.193.156.250 zachdotsey.com GET /wordpress/ HTTP/1.1
104-3 20843 0/507/949 W 99.96 28160 0 0.0 7.70 11.64 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
105-3 20844 0/308/1868 W 23.03 30024 0 0.0 3.00 28.11 78.31.110.126 zachdotsey.com GET /wordpress/feed HTTP/1.1
106-3 17791 1/278/1026 W 26.89 31698 0 0.4 4.18 13.29 208.92.218.250 zachdotsey.com GET /wordpress/ HTTP/1.1
107-3 17792 0/304/642 W 12.27 31388 0 0.0 2.72 8.79 58.61.164.39 zachdotsey.com GET /robots.txt HTTP/1.1
108-3 17697 0/57/515 W 0.30 32611 0 0.0 1.78 8.41 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
109-3 19715 0/611/783 W 60.52 29153 0 0.0 5.94 7.20 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
110-3 13952 0/345/614 W 5.95 33656 0 0.0 3.47 8.18 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
111-3 32009 0/75/1959 W 5.25 24778 0 0.0 1.06 22.60 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
112-3 17793 0/35/178 W 11.11 32590 0 0.0 0.44 1.92 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
113-3 19533 0/8/2004 W 0.16 16705 0 0.0 1.32 34.66 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
114-3 22622 0/304/925 W 181.63 28201 0 0.0 5.05 12.30 72.30.161.222 zachdotsey.com GET /wordpress/2008/10/26/tiring-surf-sessions/ HTTP/1.0
115-3 26656 0/38/763 W 0.55 27724 0 0.0 0.40 6.22 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
116-3 31804 0/57/3039 W 2.17 10748 0 0.0 1.27 44.70 142.166.3.122 zachdotsey.com GET /wordpress/2009/07/13/millys-first-time-in-a-restaurant/ HT
117-3 26658 0/0/866 W 14.05 28069 0 0.0 0.00 11.50 74.6.18.233 zachdotsey.com GET /robots.txt HTTP/1.0
118-3 26659 0/46/646 W 4.59 27608 0 0.0 0.47 4.90 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
119-3 5457 0/86/998 W 21.35 21916 0 0.0 1.59 14.79 69.147.79.37 zachdotsey.com GET /robots.txt HTTP/1.0
120-3 9855 0/486/1470 W 58.03 18535 0 0.0 8.31 25.07 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
121-3 17802 0/8/206 W 0.05 32743 0 0.0 0.00 1.67 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
122-3 17803 0/10/141 W 0.19 32701 0 0.0 0.00 1.08 74.6.18.233 zachdotsey.com GET /wordpress/2008/12/ HTTP/1.0
123-3 19888 0/69/120 W 0.37 31389 0 0.0 0.97 1.10 66.249.66.2 zachdotsey.com GET /robots.txt HTTP/1.1
124-3 25184 0/160/689 W 33.97 27701 0 0.0 5.24 9.16 75.219.249.154 zachdotsey.com GET /wordpress/tag/missy-warkentien/ HTTP/1.1
125-3 27208 0/615/2460 W 28.73 10736 0 0.0 7.88 44.54 142.166.3.122 zachdotsey.com GET /wordpress/2009/07/14/millys-smile/ HTTP/1.1
126-3 21945 0/281/410 W 4.56 29359 0 0.0 3.82 7.16 74.6.18.233 zachdotsey.com GET /robots.txt HTTP/1.0
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答案1
在您说出您拥有的模块后，我注意到您提到了 EAccelerator，它有一个错误（错误跟踪器链接这里) 会导致 Apache 陷入无休止的循环中，并使服务器几乎陷入停滞状态，请尝试禁用该功能并查看会发生什么。
答案2
你有看到许多在问题时间请求POST /wordpress/wp-admin/admin-ajax.php？如果是这样，那么这可能是由于路过的垃圾邮件发送者试图强行攻击、故意发起 DoS 攻击，或者只是因为网站不时地发布到某个繁忙的地方（您的日志是否显示许多请求来自同一个站外引用者？）。
这也可能是一个数据库锁定问题，即一个请求要求对一个经常访问的表执行一个长时间的操作，并使用完全拒绝读取直到完成的锁定，而其他请求只是停留在等待锁定被释放（这可能是自然发生的，或者由于你杀死了 Apache，因此也杀死了持有锁定的连接）。如果站点足够繁忙，那么这可能会产生很大的负载，因为会创建大量的 Apache 进程，这些进程会一直消耗内存，直到它们可以继续通过锁定 - 如果你的 Apache 配置可以创建相对不受限制数量的子进程，那么系统很容易在此时开始交换。
要查看负载是否由 CPU 使用、数据库访问等引起的 IO 或交换抖动引起的 IO 引起，您需要调查 htop（或只是简单的 top）、free 和其他常用系统负载监控实用程序的输出。这可能会提供更多线索，让您知道问题的根源在哪里。
答案3
这看起来绝对像是针对您所托管的某个网站发起的 Slowloris DoS 攻击。
查找更多详细信息以及 Debian 和 Red-Hat 解决方案这里
该类攻击的其他症状之一是 Apache 日志中出现数十/数百个 400 错误（如果/在攻击结束后 - 请访问 ha.ckers.org/slowloris/ 了解更多信息）
答案4
您的 PHP 脚本是否发出任何数据库请求？如果是，请验证数据库是否及时响应。