I tried testing my code inside CarbonStuckThreadDetectionValve in
org.wso2.carbon.tomcat.ext in carbon core inside invoke() method. What
I did was when a thread passes through the valve to inside (Request) I
measured the CPU time associated with it. When the thread passes again
through the valve (after completing execution) I again measured the
thread execution CPU time.
Long key = Thread.currentThread().getId();
ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
System.out.println("Thread ID is : "+ key);
System.out.println("Thread Execution CPU time is :
"+threadBean.getThreadCpuTime(key)/ 1000000 + "ms");
System.out.println("Tenant Domain : "+
Utils.getTenantDomain(request));
System.out.println("Request URI : "+ request.getRequestURI());
System.out.println("-----------------------------------------------");
getNext().invoke(request, response); // previous code to
invoke next valve inside invoke() method
Long key2 = Thread.currentThread().getId();
System.out.println("Thread ID is(1) : "+ key2);
System.out.println("Thread Execution CPU time is(1) :
"+threadBean.getThreadCpuTime(key2)/ 1000000 + "ms");
System.out.println("Tenant Domain(1) : "+
Utils.getTenantDomain(request));
System.out.println("Request URI(1) : "+ request.getRequestURI());
System.out.println("================================");
Output when I tried with a Sample Web Service(with larger calculation
inside a loop) in Application Server
Thread ID is : 133
Thread Execution CPU time is : 20ms
Tenant Domain : lasinduc.com
Request URI : /carbon/admin/jsp/WSRequestXSSproxy_ajaxprocessor.jsp
-----------------------------------------------
Thread ID is : 160
Thread Execution CPU time is : 0ms
Tenant Domain : lasinduc.com
Request URI :
/services/t/lasinduc.com/SimpleService.SimpleServiceHttpSoap12Endpoint/
-----------------------------------------------
Thread ID is(1) : 160
Thread Execution CPU time is(1) : 1860ms <--- Can be used as the
CPU time of the particular request of the tenant
Tenant Domain(1) : lasinduc.com
Request URI(1) :
/services/t/lasinduc.com/SimpleService.SimpleServiceHttpSoap12Endpoint/
================================
Thread ID is(1) : 133
Thread Execution CPU time is(1) : 30ms
Tenant Domain(1) : lasinduc.com
Request URI(1) : /carbon/admin/jsp/WSRequestXSSproxy_ajaxprocessor.jsp
=================================
Basically what I did was measuring the CPU time of a thread twice
through a valve. (Before & after hitting axis2). This worked fairly
well with the tests I did with AS and can be used to measure the CPU
time per tenant in SLive.
I tried this with sample web applications in the AS as well and worked
fine and gave fairly measurable amount of time. What I can is to
filter-in the necessary threads and measure CPU time per thread for a
particular tenant. (with request URL : /t/lasinduc.com)
What I can do next is to publish this CPU usage statistics per tenant
to BAM and get the summation of CPU time at the end of the month or at
any given point of time.
Is there any other way where I could try this out or am I going in the
right direction?
Lasindu Charith
Intern WSO2 Inc.
Mobile : 94714427192
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