Detecting Hardware Threads

[Aleksey Shipilev]

On 6/3/21 3:48 PM, Thomas, Samuel wrote:
> I am working on a project that requires reducing the number of usable
> hardware threads for a benchmark that is run in the Hotspot JVM. Where in
> the configuration of the JVM is this determination made and where in the
> source should I be looking in order to make such a change?

Looking for -XX:ActiveProcessorCount=# option?

The detection code would likely be OS-dependent, and grepping ActiveProcessorCount would get you 
near detection code. For example, Linux:
   https://github.com/openjdk/jdk/blob/master/src/hotspot/os/linux/os_linux.cpp#L4700-L4732

-- 
Thanks,
-Aleksey