On 2021-06-03 10:27, Robert P. J. Day wrote:
> On Thu, 3 Jun 2021, Dianne Skoll wrote:
>
> > On Thu, 3 Jun 2021 10:19:22 -0400
> > "Michael P. Soulier" <[email protected]> wrote:
> >
> > > On 2021-06-03 10:09 a.m., Dianne Skoll wrote:
> > > > See the -j option
> >
> > > Seems like a race condition waiting to happen.
> >
> > 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.
I routinely use make -j 8 on an 8-core machine to build the linux
kernel. I only ran into problems when I tried to include the targets
"modules_install" and "install" in the same multithreaded make command.
It even works over NFS as long as the two clocks are reasonably close.
> rday
slainte mhath, RGB
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