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Do not add two to the default job count #1449

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Do not add two to the default job count #1449

wants to merge 2 commits into from

Commits on Jul 10, 2018

  1. Do not add two to the default job count 

    Benchmarks show that increasing the number of make jobs past the number of CPUs decreases performance: https://blogs.gentoo.org/ago/2013/01/14/makeopts-jcore-1-is-not-the-best-optimization/. This was conducted 5 years ago. Since then, although context switching itself has become faster, both CPU cache size and compiler memory usage have increased (the latter particularly so for C++). Moreover, compilers spend even less time on I/O now than they did then; any reasonable software package's header files will all fit into main memory. Therefore, I believe the results should be even more significant today.
    @Hello71
    Hello71 authored Jul 10, 2018
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  2. fixup! Do not add two to the default job count

    @Hello71
    Hello71 committed Jul 10, 2018
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