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用JDK5.0自带工具解决实际工作中的问题(2)

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每一个请求的响应时间大概去到8-9秒时间，这个是客户所不能接受的。

作者：中国IT实验室来源：中国IT实验室 2007年8月21日

关键字： JDK5

　每一个请求的响应时间大概去到8-9秒时间，这个是客户所不能接受的。

　这时我们决定采用JDK5.0自带的jstack来进行trouble-shoot,首先重新做加压测试，并行请求为10个，总共100个请求，这时对Resin服务器所起的Java进程间隔10秒用jstack做一次采集工作。为什么要间隔10秒？主要是想看看在这三十秒内Java进程是否都阻塞在同一个地方。结果如下：

　大部分的线程都阻塞在同一个java stack上面:

Thread t@38: (state = BLOCKED)

- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- com._xxx.vportal.common.rpc.session.RemoteServiceGroupFactory.getMaxBalanceFactoryEntry() @bci=165,
line=180 (Interpreted frame)
- com._xxx.vportal.common.rpc.session.RemoteServiceGroupFactory.getService() @bci=80, line=195 (Interpreted
frame)
- com._xxx.vportal.common.rpc.session.RemoteServiceFactory.getSynSender() @bci=1, line=331 (Interpreted
frame)
- com._xxx.vportal.common.rpc.session.RemoteServiceSupport.synRequestHardTask(java.lang.String,
java.lang.Object) @bci=6, line=35 (Interpreted frame)
- com._xxx.vportal.amus.user.client.UserClientRpcImpl.getIconSigner(int, int) @bci=36, line=90 (Interpreted frame)
- net._xxx.forum.model.user.UserInfo.getLogoPath() @bci=109, line=546 (Interpreted frame)
- sun.reflect.GeneratedMethodAccessor13.invoke(java.lang.Object, java.lang.Object[]) @bci=36 (Interpreted frame)
- sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=25
(Compiled frame)
- org.apache.velocity.runtime.parser.node.ASTReference.execute(java.lang.Object,
org.apache.velocity.context.InternalContextAdapter) @bci=40, line=207 (Compiled frame)

- org.apache.velocity.runtime.parser.node.ASTBlock.render(org.apache.velocity.context.InternalContextAdapter,
java.io.Writer) @bci=18, line=94 (Compiled frame)

- org.apache.velocity.runtime.parser.node.SimpleNode.render(org.apache.velocity.context.InternalContextAdapter,
java.io.Writer) @bci=18, line=271 (Interpreted frame)

-
org.apache.velocity.runtime.parser.node.ASTIfStatement.render(org.apache.velocity.context.InternalContextAdapter,
java.io.Writer) @bci=63, line=128 (Interpreted frame)

- org.apache.velocity.runtime.parser.node.ASTBlock.render(org.apache.velocity.context.InternalContextAdapter,
java.io.Writer) @bci=18, line=94 (Compiled frame)

- org.apache.velocity.runtime.directive.Foreach.render(org.apache.velocity.context.InternalContextAdapter,
java.io.Writer, org.apache.velocity.runtime.parser.node.Node) @bci=95, line=344 (Interpreted frame)

- org.apache.velocity.runtime.parser.node.ASTDirective.render(org.apache.velocity.context.InternalContextAdapter,
java.io.Writer) @bci=14, line=153 (Interpreted frame)

- org.apache.velocity.runtime.parser.node.SimpleNode.render(org.apache.velocity.context.InternalContextAdapter,
java.io.Writer) @bci=18, line=271 (Interpreted frame)

- org.apache.velocity.app.Velocity.evaluate(org.apache.velocity.context.Context, java.io.Writer, java.lang.String,
java.io.Reader) @bci=102, line=359 (Interpreted frame)

- org.apache.velocity.app.Velocity.evaluate(org.apache.velocity.context.Context, java.io.Writer,
java.lang.String, java.lang.String) @bci=18, line=253 (Interpreted frame)

- net._xxx.forum.util.velocity.VelocityUtil.getVelocityEvaluate(java.util.Map, java.io.Writer,
java.lang.String) @bci=14, line=35 (Interpreted frame)
- net._xxx.forum.action.forum.BbsMessageListAction.go() @bci=1284, line=268 (Interpreted
frame)
–
net._xxx.forum.action.AbstractAction.execute() @bci=1, line=39 (
–
..............

　和应用的开发人员交流后，发现这些有问题的程序，都是和论坛系统中Socket调用有关，当用户打开一个页面是，页面中的用户信息需要同过Socket的方式调用相册那边的数据，这个操作存在bug，经过用户的重新同步更新程序，问题解决。

　解决后的实测的数据如下, 效果非常理想：

This is ApacheBench, Version 2.0.41-dev <$Revision: 1.121.2.12 $> apache-2.0
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking free.xxx.com (be patient)
Completed 5000 requests
Completed 10000 requests
Completed 15000 requests
Completed 20000 requests
Completed 25000 requests
Completed 30000 requests
Completed 35000 requests
Completed 40000 requests
Completed 45000 requests
Finished 50000 requests
Server Software: Apache/2.0.59
Server Hostname: free.xxx.com
Server Port: 80

Document Path: /forum/bbsMessageList.act?bbsThreadId=1581280
Document Length: 27508 bytes
Concurrency Level: 30
Time taken for tests: 252.583749 seconds
Complete requests: 50000
Failed requests: 0
Write errors: 0
Total transferred: 1384158363 bytes
HTML transferred: 1375408188 bytes
Requests per second: 197.95 [#/sec] (mean)
Time per request: 151.550 [ms] (mean)
Time per request: 5.052 [ms] (mean, across all concurrent requests)
Transfer rate: 5351.56 [Kbytes/sec] received

Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.4 0 11
Processing: 45 150 154.1 117 4349
Waiting: 41 145 153.7 112 4346
Total: 45 150 154.1 117 4349
Percentage of the requests served within a certain time (ms)
50% 117
66% 142
75% 163
80% 180
90% 241
95% 321
98% 478
99% 764
100% 4349 (longest re