> On Feb 27, 2015, at 12:00 PM, Jed Brown <[email protected]> wrote:
>
> Barry Smith <[email protected]> writes:
>> Actually the parallel compiles of the 1000+ files on the "regular"
>> filesystems at ANL and LBL is taking less than 2 minutes so I can't
>> blame the filesystem bandwidth.
>
> I think bandwidth is adequate, but latency (especially for metadata) is
> rather high. Normal make uses parallelism to mitigate, but configure is
> sequential, so gets hit harder.
Yup, that was my conclusion. So the solution is 1) apply pressure to
improve latency on these systems a bit and 2) incorporate more parallelism in
./configure without making it even more complicated. Or switch to cmake where
you don't test anything but just read the machines capabilities from an
outdated database :-).
Barry
