c++ - Benchmarking and restricting execution to a specific CPU -

how can constrain benchmarks run on single cpu (e.g. c0)? running benchmarks , want expose tests environment similar target. advice how ensure there minimal other processes running run benchmarks.

import std.datetime; import std.stdio;  void algorithm() {     writeln("hello!"); }  void main() {     stopwatch stopwatch;     stopwatch.start();      algorithm();      stopwatch.stop();     auto duration = stopwatch.peek();     writeln("hello duration ==> ", duration); } 

have tried using numactl? useful memory , process binding here link man page.

for example

numactl --physcpubind=0 myapp args 

will bind process myapp core 0.

depending on want there may different syntax. example specifying specific cores on cpu or memory binding. format of arguments application may impact numactl syntax.

as reducing number of other processes there several options, specifics os dependent. if want test system in environment minimal background noise design custom os image minimal packages required turn node on , run benchmarks. approach similar 1 employed in many modern hpc clusters. if have multiple servers available using cluster management tool warewulf might useful, there many reference designs , recipes available online building small cluster.

other options include turning off background , unnecessary programs , applications. can switch off unnecessary services , unload unused kernel modules.

some power , performance setting in bios may have impact. settings related power consumption may impact things frequency scaling , throttling, can create unpredictable results during performance tests. factors impact workloads produce large numbers of floating-point operations, can extended cpu intensive operation.

understanding constraints of problem important when profiling code. knowing if code cpu bound, memory bound or io bound can make big difference in tools used profile optimization techniques can used.