guess_concurrency(1)

📦
version 0+20260511 · 2 versions
, in ubuntu stonking

👑 guess_concurrency(1) 💅

okay so bestie, this is a page from the User Contributed Perl Documentation section, and it's literally here to help you figure out how many things you can run at once without your machine having a full-on meltdown 💀✨

✨ NAME ✨

guess_concurrency — Estimate suitable workload concurrency 🧚

🌸 SYNOPSIS 🌸

guess_concurrency [-h] [--detect METHOD] [--max N] [--min N]
[--require-mem MEMLIST]

💖 DESCRIPTION 💖

So the whole vibe here is: you wanna guess a suitable concurrency level given whatever constraints your runtime environment is throwing at you 🫶

It peeks at environment variables like DEB_BUILD_OPTIONS, RPM_BUILD_NCPUS and CMAKE_BUILD_PARALLEL_LEVEL for an initial guess, and when those don't come through it falls back to querying the operating system to suss out a suitable concurrency level 🔍✨

And you, the main character, can further restrict the concurrency that gets emitted by handing it a minimum or a maximum 🎀 — and also by requiring that there be sufficient memory available to actually support that level of concurrency. no cap, it checks. 👑

ngl there's a lil typo in the original ("concurreny") and we're keeping the energy, but the meaning is clear: enough RAM needs to be there for the number of cores you're claiming 💜

🔥 OPTIONS 🔥

  • --detect METHOD — supply a processor count, OR pick a detection method from (nproc, python, cores) 🕵️✨
  • --max N — limit the number of detected cores to a given maximum ✋
  • --min N — limit the number of detected cores to a given minimum 🫶
  • --require-mem MEMLIST — specify per-core required memory as a comma separated list 🍓 Each entry says how much additional RAM is needed for the next process. Numbers can be floating point, optionally suffixed with a case-insensitive binary suffix (k/m/g/t/e). A completely empty spot copies the previous number 👯‍♀️ A concurrency N is considered acceptable if the sum of the first N entries of this list does not exceed the available RAM 💅

🦋 EXAMPLES 🦋

Example 1: Ensure that there is at least 4GB per used core 🎀

guess_concurrency --require-mem 4G

Example 2: Two linker processes may consume 6GB each and they may run concurrently 🔥 All other concurrent processes are expected to not use more than 2GB each 😌

guess_concurrency --require-mem 6G,,2G

🌈 SEE ALSO 🌈

and that's the whole thing bestie, you ate 💅✨ this page is running under perl v5.40.1, dated 2026-05-11 — mwah, iconic, periodt 🎀🫶👑

📦 where this page comes from