> On Jun 3, 2021, at 10:27, Robert P. J. Day <rpj...@crashcourse.ca> wrote:
>
>>
>> Shouldn't be. My understanding (which may be wrong) is that make
>> calculates the dependency graph first, not in parallel. Then it
>> executes as many parallel tasks as the -j option asks for, or that
>> make sense... whichever is smaller. Since the dependency graph is a
>> DAG, make should, in theory, be smart enough to see that two
>> dependencies depend on the same node and run only one job to build
>> the depended-upon node.
>>
>> I routinely use "make -j `nproc`" and have never run into any
>> issues.
>
> this was my understanding as well, i just wanted to hear some
> confirmation from someone else.
Diane is correct. As long as the dependency graph is specified properly in the
Makefile, make -j should work fine.
I have ran make -j for ffmpeg and x265 on an AMD EPYC server with 128 threads.
Amazing how fast a build can be and how much RAM can be sucked up with a few
hundred compiles stacked up waiting to run.
/sc
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