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From "" <>
Subject Tomcat 7 performance tuning take full advantage of hardware
Date Tue, 21 Jun 2016 13:04:41 GMT
    I had done some stress tests on Apache Tomcat/7.0.47 and found that tomcat 
didn't taken full advantage of hardware resources.I had used Apache Benchmark 
tool(ab) to do benckmark,and then monitor the jvm instance of tomcat via 
jvisualvm.In the benchmark,I just test the response time of request a jsp.
The CPU usage is not high,about 20%,even when the concurrent requests increased.
So how can I to do some performance tuning to make tomcat 7 take full advantage
of hardware resources?

The test enviroment:
andy@test80:~$ uname -a
Linux test80 3.8.0-29-generic #42~precise1-Ubuntu SMP Wed Aug 14 16:19:23 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux

andy@test80:~$ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                16
On-line CPU(s) list:   0-15
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 44
Stepping:              2
CPU MHz:               1596.000
BogoMIPS:              4800.19
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              12288K
NUMA node0 CPU(s):     0-3,8-11
NUMA node1 CPU(s):     4-7,12-15

andy@test80:~$ java -version
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

andy@test80:~$ vmstat -s
     82481856 K total memory
     81243296 K used memory
     51191508 K active memory
     27359516 K inactive memory
      1238560 K free memory
       454584 K buffer memory
     46734728 K swap cache
     33542140 K total swap
        11836 K used swap
     33530304 K free swap
   3259773994 non-nice user cpu ticks
       172256 nice user cpu ticks
    137055078 system cpu ticks
  28564934681 idle cpu ticks
     17736327 IO-wait cpu ticks
         2324 IRQ cpu ticks
      7998142 softirq cpu ticks
            0 stolen cpu ticks
     39740382 pages paged in
  71293969233 pages paged out
        14159 pages swapped in
        73239 pages swapped out
   2381549755 interrupts
   1089236704 CPU context switches
   1446432805 boot time
      2733476 forks
CATALINA_OPTS='-Xms2g -Xmx2g -XX:PermSize=500M -XX:MaxPermSize=500M -Xss256K -XX:+DisableExplicitGC
-XX:SurvivorRatio=1 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled
-XX:+UseCMSCompactAtFullCollection -XX:CMSFullGCsBeforeCompaction=0 -XX:+CMSClassUnloadingEnabled
-XX:LargePageSizeInBytes=128M -XX:+UseFastAccessorMethods -XX:+UseCMSInitiatingOccupancyOnly
-XX:CMSInitiatingOccupancyFraction=80 -XX:SoftRefLRUPolicyMSPerMB=0

<Service name="Catalina">
      <Connector port="18108"
             enableLookups="false"   />
      <Engine name="Catalina" defaultHost="localhost">
        <Host name="localhost"  appBase="/data/tomcats/ws_18108"
              unpackWARs="true" autoDeploy="false">
          <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
                 prefix="localhost_access_log." suffix=".txt"
                 pattern="%h %l %u %t &quot;%r&quot; %s %b" />
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