CPU pinning Java threads with jstack and taskset: "Recently I've been tuning our market data feed processors. This is a single threaded "straight line speed" application that reads data from the network, parses it, converts to our internal data format, and writes out again.
I've already reduced the time taken for a benchmark workload (parse a large data feed file) by 68% using only code changes (going to blog this soon) but wanted to see if OS-level optimisations could reduce this further.
Here is an experiment into pinning the main application thread to a CPU core to see if that prevents loss of performance when the OS scheduler moves the thread between CPU cores or sockets (thus losing cache contents).
Results were measured using
perf stat -o perf.log java MyWorkloadClass
On Linux you can use the taskset command to pin a process to a CPU core.
First you need to discover the native ID for the Java thread you want to pin."
'via Blog this'
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