I am running a load test with 2 web (apache) and 2 appservers (tomcat). I am
noticing that after 250 users, I start seeing very high CPU usage and very
high load. Below is the o/p from top command. I also saw this message in
catalina.out: "SEVERE: All threads (250) are currently busy, waiting.
Increase maxThreads (250) or check the servlet status"
top - 00:31:21 up 138 days, 7:44, 0 users, load average: 20.68, 14.47,
6.99
Tasks: 88 total, 2 running, 86 sleeping, 0 stopped, 0 zombie
Cpu(s): 95.1%us, 2.5%sy, 0.0%ni, 0.9%id, 0.0%wa, 0.1%hi, 1.4%si,
0.0%st
Mem: 16439088k total, 3260004k used, 13179084k free, 187148k buffers
Swap: 2031608k total, 0k used, 2031608k free, 1528756k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4771 tomcat 16 0 3119m 1.3g 25m S 396 8.2 41:56.61 java
1 root 18 0 10308 660 552 S 0 0.0 0:01.54 init
2 root RT 0 0 0 0 S 0 0.0 0:00.07 migration/0
3 root 34 19 0 0 0 S 0 0.0 0:00.00 ksoftirqd/0
4 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0
5 root RT 0 0 0 0 S 0 0.0 0:00.05 migration/1
6 root 34 19 0 0 0 S 0 0.0 0:00.00 ksoftirqd/1
7 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/1
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