On Tue, Nov 24, 2020 at 10:33:18AM +0800, Qian Yun wrote:
> Hi Dima,
>
> From
> https://docs.github.com/en/free-pro-team@latest/actions/reference/specifications-for-github-hosted-runners
> it says each VM has 2 CPU cores. And my test shows that "make -j8"
> doesn't make it faster.
On real hardware IME it pays to have number of jobs larger than
number of cores. On uniprocessors I used '-j3', on dual
core '-j5', on quad core '-j7', on machine with 20 cores
I use '-j15' (with such number of jobs serial parts
dominate, so gains are limied and I prefer to limit
top load of machine). It is not clear how virtual machine
affects runtime.
--
Waldek Hebisch
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