On 3/10/16 2:09 PM, Christopher Schultz wrote:
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Rallavagu,
On 3/10/16 4:02 PM, Rallavagu wrote:
On 3/10/16 11:54 AM, Christopher Schultz wrote:
Are you sure you have matched-up the correct thread within the
JVM that is using all that CPU?
How are you measuring the CPU usage?
It would the ID output from "top -H" mapping to "Native ID" in
thread dump.
My version of 'top' (Debian Linux) doesn't show thread ids. :(
I seem to recall having to do some backflips to convert native thread
id to Java thread id. Can you explain what you've done to do that?
A typical top -H shows the following
top - 11:40:11 up 190 days, 1:24, 1 user, load average: 5.74, 6.09, 5.78
Tasks: 759 total, 4 running, 755 sleeping, 0 stopped, 0 zombie
Cpu(s): 18.4%us, 1.6%sy, 0.0%ni, 79.5%id, 0.1%wa, 0.0%hi, 0.5%si,
0.0%st
Mem: 8057664k total, 7895252k used, 162412k free, 63312k buffers
Swap: 2064380k total, 199452k used, 1864928k free, 2125868k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
15648 tomcat 20 0 9649m 4.8g 4520 R 87.3 62.6 7:24.24 java
21710 tomcat 20 0 9649m 4.8g 4520 R 79.8 62.6 5:44.99 java
21694 tomcat 20 0 9649m 4.8g 4520 S 74.3 62.6 5:39.40 java
7889 tomcat 20 0 9649m 4.8g 4520 S 29.7 62.6 4:24.44 java
7878 tomcat 20 0 9649m 4.8g 4520 S 27.8 62.6 4:36.82 java
21701 tomcat 20 0 9649m 4.8g 4520 S 26.0 62.6 5:49.83 java
After taking thread dump, I used Threadlogic which will show Native-ID
as column which corresponds to PID shown above.
https://java.net/projects/threadlogic
This way it helps to determine the thread that might potentially causing
high cpu.
Can you post your <Connector> and/or <Executor> configuration?
<Connector port="28080" protocol="HTTP/1.1" URIEncoding="UTF-8"
maxThreads="500" connectionTimeout="20000" redirectPort="28443" />
Okay, so you are using the default (BIO) connector with no special
configuration. I see you are running Tomcat 7.0.47. Could you please
re-test with latest 7.0.68? Your version is 2.5 years old and there
may be a performance bug fixed.
Sure.
- -chris
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