Questions tagged [perf]

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Linux [migration/x] processes hogging CPU time

A customer has recently encountered a strange issue with some of our servers. The systems are running a slightly tweaked Debian 8.1, kernel 3.16. Over the course of several months, the CPU usage ...
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1answer
85 views

3 different methods to count the number of context switches for a specific workload provide 2 different answers

I have a Centos7 system on a Google cloud machine, running a multithreaded database server that executes a particular set of queries in 70 secs (plus or minus 1 sec). I want to know how many context ...
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1answer
152 views

High CPU usage by apache/httpd for light load, 'perf record' points at vmware/hardware

Running Apache 2.4 on RHEL7 kernel 3.10.0-1062, 4 CPU VMWare instance, doing very basic reverse proxying to WebLogic backend using WebLogic proxy plugin. Server is only pushing around 1 MByte/sec with ...
1
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1answer
236 views

how to gracefully kill linux perf tool process

I'm trying to use the linux performance tool perf to monitor kvm events on a host where a guest VM exists. The command I invoke perf is perf kvm stat record After some time, I'll press Ctrl + C to ...
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2answers
64 views

How to measure profit of using huge pages

I'm looking for a way of measuring performance impact/gain, in case of using huge pages. For example, I have 192GB RAM server, with 140GB allocated by huge pages. I run Postgres, with shared buffers ...
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418 views

Better way to use Perf on a Program in Kubernetes/Docker?

I am running Kubernetes on CentOS 7, and it doesn't seem that the version of perf is namespace aware. If run perf on the PID on the host node (host node found with kubectl describe pods --namespace) ...