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Re: make: dynamic scaling of maxJobs ?

On Sat, 03 Aug 2013, Simon J. Gerraty wrote:
Alan Barrett writes:
I sometimes use wrapper scripts that run make -j $( Is it really worthwhile to add the complexity to make itself, instead of leaving it in a wrapper script?

As I said, that's what we've been doing for many years. It works great for a machine dedicated to a single build.

But it cannot not work well when N developers are sharing a box with M cores.

I have just re-read your message and I see I missed this important part:

and make will run that to get an initial value, and re-run it occasionally to adjust.

while I did not miss this part:

This only applies to the initial instance of make, the sub-makes get a normal -j value

so, I thought that only the top-level make would run the script, and that it would run it only once, giving behaviour identical to making the choice in a wrapper script.

I now see my mistake, and agree that your suggestion is useful.

--apb (Alan Barrett)

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