linux 性能优化札记。 （1 G内存服务器）
日期：2014-05-16 浏览次数：20651 次
linux 性能优化笔记。。。 （1 G内存服务器）
近期服务器性能极不稳定，打开首页速度时快时慢（目前只有一个用户，属于企业内部应用，重点是数据量非常大， 1K～ 100K 之间）
下面是从我的邮件摘录出一部分内容：
1. 访问速度不稳定。时快时慢。
近期服务器性能极不稳定，打开首页速度时快时慢（目前只有一个用户，属于企业内部应用，重点是数据量非常大， 1K～ 100K 之间）
下面是从我的邮件摘录出一部分内容：
1. 访问速度不稳定。时快时慢。
引用
下面是 今天的 (2012-05-25) 的日志： 可以看到， 前两个操作，耗费的时间非常久。。。
00:50:33 INFO: Completed 200 OK in 270450ms (Views: 1512.9ms | ActiveRecord: 13358.6ms)
01:42:15 INFO: Completed 200 OK in 246410ms (Views: 1429.3ms | ActiveRecord: 10685.1ms)
01:43:35 INFO: Completed 200 OK in 72ms (Views: 71.3ms | ActiveRecord: 0.0ms)
01:43:42 INFO: Completed 200 OK in 1852ms (Views: 1326.3ms | ActiveRecord: 165.6ms)
01:53:41 INFO: Completed 200 OK in 3749ms (Views: 1334.6ms | ActiveRecord: 2063.1ms)
01:54:23 INFO: Completed 200 OK in 13ms (Views: 7.4ms | ActiveRecord: 0.0ms)
01:54:25 INFO: Completed 200 OK in 284ms (Views: 43.3ms | ActiveRecord: 225.3ms)
01:54:31 INFO: Completed 200 OK in 246ms (Views: 42.4ms | ActiveRecord: 200.2ms)
01:54:31 INFO: Completed 200 OK in 477ms (Views: 313.1ms | ActiveRecord: 160.1ms)
另外从昨天的日志(05-24)进行一下分析，可以看到 ip : 172.21.100.1 打开首页，最慢的用了 9,704秒。（2个多小时，详细见附件： log_0524 ） （使用命令：cat log_from_configfun/manually_2012-05-24.log | grep -E 'Completed|GET|POST' > log_0524 )
867 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 19:11:54 +0000 2012
868 19:12:13 INFO: Completed 200 OK in 39137ms (Views: 5839.8ms | ActiveRecord: 4412.1ms)
869 Started GET "/babble_portal/device_groups" for 172.21.100.1 at Thu May 24 19:12:25 +0000 2012
870 19:13:45 INFO: Completed 200 OK in 93696ms (Views: 38701.7ms | ActiveRecord: 40828.7ms)
871 Started GET "/babble_portal/device_groups" for 172.21.100.1 at Thu May 24 19:14:42 +0000 2012
872 21:57:41 INFO: Completed 200 OK in 9704339ms (Views: 1176.9ms | ActiveRecord: 76436.0ms)
873 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 21:57:43 +0000 2012
874 21:58:20 INFO: Completed 200 OK in 9954427ms (Views: 174.3ms | ActiveRecord: 68178.3ms)
875 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 21:58:21 +0000 2012
876 21:58:21 INFO: Completed 200 OK in 38122ms (Views: 1435.4ms | ActiveRecord: 35950.5ms)
877 21:58:45 INFO: Completed 200 OK in 23981ms (Views: 2407.9ms | ActiveRecord: 20904.1ms)
而对于 打开首页的速度，我也做了一个分析：( 见附件： landing_page_log, 使用的命令是： cat log_from_configfun/manually_2012-05-24.log | grep -E 'Completed|GET.*portal\/"' | grep GET -A 1 > landing_page_log ) 可以看出，绿色的部分表示程序运行正常，而红色的部分表示程序运行极慢。。。
49 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:46:38 +0000 2012
50 18:46:39 INFO: Completed 200 OK in 975ms (Views: 677.1ms | ActiveRecord: 105.7ms)
51 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:47:04 +0000 2012
52 18:47:05 INFO: Completed 200 OK in 981ms (Views: 685.0ms | ActiveRecord: 98.0ms)
53 --
54 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:48:45 +0000 2012
55 18:48:47 INFO: Completed 200 OK in 1109ms (Views: 670.0ms | ActiveRecord: 89.7ms)
56 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:48:51 +0000 2012
57 18:48:51 INFO: Completed 200 OK in 944ms (Views:
00:50:33 INFO: Completed 200 OK in 270450ms (Views: 1512.9ms | ActiveRecord: 13358.6ms)
01:42:15 INFO: Completed 200 OK in 246410ms (Views: 1429.3ms | ActiveRecord: 10685.1ms)
01:43:35 INFO: Completed 200 OK in 72ms (Views: 71.3ms | ActiveRecord: 0.0ms)
01:43:42 INFO: Completed 200 OK in 1852ms (Views: 1326.3ms | ActiveRecord: 165.6ms)
01:53:41 INFO: Completed 200 OK in 3749ms (Views: 1334.6ms | ActiveRecord: 2063.1ms)
01:54:23 INFO: Completed 200 OK in 13ms (Views: 7.4ms | ActiveRecord: 0.0ms)
01:54:25 INFO: Completed 200 OK in 284ms (Views: 43.3ms | ActiveRecord: 225.3ms)
01:54:31 INFO: Completed 200 OK in 246ms (Views: 42.4ms | ActiveRecord: 200.2ms)
01:54:31 INFO: Completed 200 OK in 477ms (Views: 313.1ms | ActiveRecord: 160.1ms)
另外从昨天的日志(05-24)进行一下分析，可以看到 ip : 172.21.100.1 打开首页，最慢的用了 9,704秒。（2个多小时，详细见附件： log_0524 ） （使用命令：cat log_from_configfun/manually_2012-05-24.log | grep -E 'Completed|GET|POST' > log_0524 )
867 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 19:11:54 +0000 2012
868 19:12:13 INFO: Completed 200 OK in 39137ms (Views: 5839.8ms | ActiveRecord: 4412.1ms)
869 Started GET "/babble_portal/device_groups" for 172.21.100.1 at Thu May 24 19:12:25 +0000 2012
870 19:13:45 INFO: Completed 200 OK in 93696ms (Views: 38701.7ms | ActiveRecord: 40828.7ms)
871 Started GET "/babble_portal/device_groups" for 172.21.100.1 at Thu May 24 19:14:42 +0000 2012
872 21:57:41 INFO: Completed 200 OK in 9704339ms (Views: 1176.9ms | ActiveRecord: 76436.0ms)
873 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 21:57:43 +0000 2012
874 21:58:20 INFO: Completed 200 OK in 9954427ms (Views: 174.3ms | ActiveRecord: 68178.3ms)
875 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 21:58:21 +0000 2012
876 21:58:21 INFO: Completed 200 OK in 38122ms (Views: 1435.4ms | ActiveRecord: 35950.5ms)
877 21:58:45 INFO: Completed 200 OK in 23981ms (Views: 2407.9ms | ActiveRecord: 20904.1ms)
而对于 打开首页的速度，我也做了一个分析：( 见附件： landing_page_log, 使用的命令是： cat log_from_configfun/manually_2012-05-24.log | grep -E 'Completed|GET.*portal\/"' | grep GET -A 1 > landing_page_log ) 可以看出，绿色的部分表示程序运行正常，而红色的部分表示程序运行极慢。。。
49 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:46:38 +0000 2012
50 18:46:39 INFO: Completed 200 OK in 975ms (Views: 677.1ms | ActiveRecord: 105.7ms)
51 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:47:04 +0000 2012
52 18:47:05 INFO: Completed 200 OK in 981ms (Views: 685.0ms | ActiveRecord: 98.0ms)
53 --
54 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:48:45 +0000 2012
55 18:48:47 INFO: Completed 200 OK in 1109ms (Views: 670.0ms | ActiveRecord: 89.7ms)
56 Started GET "/babble_portal/" for 172.21.100.1 at Thu May 24 18:48:51 +0000 2012
57 18:48:51 INFO: Completed 200 OK in 944ms (Views:
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