Tomcat性能测试

测试环境

• OS: Linux Red Hat 4.4.7-11
• Memery: 16G
• CPU: 4 Processor(Intel(R) Xeon(R))
• JDK:1.8
• Web服务器r: Tomcat 7.x
• 测试工具: Jmeter-2.9
• Monitor Tools: jconsole,jvisualvm,jstat

Prepare

 Run a simple servlet  at the Server container,as exclude Application delay,It just return a echo word.

Reference

• Cient Thread: Mock User Request
• Average: Response Time,unit:ms
• Throughput: Query per Second,The formula is: Throughput = (number of requests) / (total time).
• Maxthreads:The maximum num of connections that the server will accept and process.

Case 1

Server parameters as default

maxThread: 200

Client Thread	Average	Throughput	load average
100	230	422	<1
500	317	1545	<1
1000	382	2415	<1
1500	3269	197	<1

As the table shows,The Throughput increase  with the client's increase.But it decrease obviousely when client num over 1000.

Check the server,we can see every work thread is busy

Case 2

maxThread:  500

Client Thread	Average	Throughput	load average
500	257	1935	<3
1000	322	3086	<3
1500	417	3458	<3
2000	584	2815	<3
3000	886	2487	<3

Case 3

maxThread: 5000

Client Thread	Average	Throughput	load average
100	217	450	<2
500	219	2240	<2
1000	310	105	<2

When the client over 1000,The Client Http tools appear many error logs,It shows "client  Non HTTP response message: Read timed out",

check the tomcat log to get the error:

java.lang.OutOfMemoryError: unable to create new native thread  
    at java.lang.Thread.start0(Native Method)  
    at java.lang.Thread.start(Thread.java:691)  
    at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:949)  
    at java.util.concurrent.ThreadPoolExecutor.processWorkerExit(ThreadPoolExecutor.java:1017)  
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1163)  
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)  
    at java.lang.Thread.run(Thread.java:722)  

It shows The maxTheads number  exceed the limiting  Number of Processes Available,The CentOs  max user processes default is 1024,update the param 
 at file /etc/security/limits.d/90-nproc.conf as following,

*  soft   nofile 65536

*  hard   nofile 65536

*  soft   nproc  10240

*  hard   nproc  10240

Case 4

continue the test,

maxThread: 5000

Client Thread	Average	Throughput	load average
500	198	2171	<3
1000	199	4087	<3
1500	211	5106	<3
2000	220	5820	<3

Case 5

1.update the JVM options 

JAVA_OPTS="$JAVA_OPTS -Xms3g -Xmx5g -Xss512K -XX:PermSize=256m -XX:MaxPermSize=512m "

2.maxThread: 5000

Client Thread	Average	Throughput	maxThreads	load average
500	201	6926	5000	3.6
1000	220	8122	5000	4.02
1500	348	8238	5000	4.3
2000	446	7869	5000	8.2

Now,Check the  JVM,

It seam there's enought Memory,and The GC frequency is not hight,So exclude the VM Memory factor, And As the case 5 shows,

Load is over the CPU max load,It have arrive the bottleneck of system.