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On Sat, 01 Jan 2011 15:27:17 GMT, Neoh wrote:
> Hi, > > There are some things I don't understand regarding two questions in the > build script in version 9.4: > > Do you expect to run these scripts and binaries on multiple machines? [n] > ...How many parallel jobs should make launch?  > > 1)Are these two questions related to each other?
No. The first has been around for a while, and is related to whether you're doing this build on a shared disk or on a single-user machine. The second is new, and is related to Make (GNU Make) being able to launch multiple compiler processes during a build.
> 2) As for the second (new) question, how would different values affect > my future performance, if any? Let's say I want to run parallel > computation with MPI. Must I run the same number of parallel jobs as > what I answer in the second question above?
No. The second question is unrelated to execution time. It's only for the GNU Make building (in particular, the "-j" flag). I have a dual-core MacBook, for example; I can answer "2" to the second question, and gmake will launch two compile processes at the same time, each one running on one of my cores. Builds on my machine will go about 1.5 times faster than with a single job.
-- Michael Kelsey
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