JMeter cannot collect CPU per process due to Access Denied error

K. B. Published at Dev

K. B.

I have setup server monitoring in a JMeter test. The setup is very similar to the one in this stackoverflow answer. When I am collecting CPU or memory without specifying a process, everything works as expected. I see the graphs with correct metrics.

However, when I try to collect CPU per process, for example with metric parameter pid=8948:percent, the graph is empty, no samples are collected and I see the following exception on the monitored server:

ERROR   2018-04-03 13:17:14.607 [kg.apc.p] (): Error getting metric
org.hyperic.sigar.SigarPermissionDeniedException: Access is denied.
: 8948
        at org.hyperic.sigar.SigarProxyCache.invoke(SigarProxyCache.java:218)
        at com.sun.proxy.$Proxy0.getProcCpu(Unknown Source)
        at kg.apc.perfmon.metrics.CPUProcMetric.getValue(CPUProcMetric.java:35)
        at kg.apc.perfmon.PerfMonMetricGetter.getMetricsLine(PerfMonMetricGetter
.java:114)
        at kg.apc.perfmon.PerfMonWorker.processSenders(PerfMonWorker.java:280)
        at kg.apc.perfmon.PerfMonWorker.run(PerfMonWorker.java:243)
        at java.lang.Thread.run(Unknown Source)

I tried getting the process by name, but the exception is the same. I run startAgent.bat --sysinfo and indeed the user has no rights on the process w3wp.exe (8948) that I want to monitor (The user does not "see" this process).

The documentation states explicitly that I do not need admin rights on the application server (Windows Server 2012 R2). The user already has Performance Monitor Users and Performance Log Users role.

So how can I monitor CPU per process in a JMeter test with user that is not an administrator on the application server?

Dmitri T

You can work this around by running Server Agent with elevated privileges, it could be done in 2 ways:

Using psexec tool you can run a process with SYSTEM account rights
Using Task Scheduler you also have possibility to start process with the highest privileges

Given you run Server Agent with elevated rights - you should be able to collect CPU metrics for IIS process.

See How to Monitor Your Server Health & Performance During a JMeter Load Test article for more information on using PerfMon Metrics Collector and Server Agent.

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edited at2021-04-29

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