CPUMap - view and edit CPU affinities

About

CPUMap is a graphical (TUI and GUI) tool to view and edit CPU affinity of processes on a Linux system.

Screenshots

GUI	TUI

Use cases

• Benchmarking:
  • Set one thread per core to limit contention
  • Set many threads per core to maximize contention
  • Force a program to use specified cores to simulate performance on different CPUs
• Gaming:
  • Force a game to only use P-cores on an Intel Alder Lake or newer CPU
  • Force a game to only use cores with 3D V-cache on Ryzen 7950x
  • Force a game to use a single CCD on an AMD Zen 3 or newer CPU
• Profiling:
  • Force a program to only run on one type of CPU (P-cores or E-cores) to get consistent values from CPU performance counters.
• Workstation:
  • Prevent resource-intensive program from hogging all cores to ensure system responsiveness.
• High-performance applications:
  • Run threads of an IDS to cores where packets are received from a NIC.
  • Maximize cache-per-thread by running only one thread per CCD of an AMD Epyc CPU.

Note that tweaking CPU affinity is unlikely to improve performance if you don't know what you are doing - usually, it's best to let the OS scheduler do its work.

Features

• OS support:
  • Linux
  • May work on other Unix-like OS's (based on the hwloc library) but only Linux has been tested so far.
• GUI and TUI frontends (with identical features)
• Visualize CPU topology hierarchy with caches and logical cores ('hyperthreads')
• View affinities for all running processes
• Fuzzy search running processes
• Set cores a process and each individual thread of that process can use
  • Manually
  • 'Thread order', e.g. one core, L3, etc. per thread
• Run programs with specified affinity
  • Run programs and control affinity of subprocesses launched by those programs

Install

• TUI build: cargo install cpumap
• GUI build: cargo install --no-default-features --features gui cpumap

Or get the linux x64 binaries

You may need to install the hwloc library; Names or its Linux packages usually start with libhwloc.

Run

cpumap

License

Licensed under the MIT license, see file LICENSE.