[CMake] Obtaining improved GNU make performance on Makefiles generated by cmake
Bill Hoffman
bill.hoffman at kitware.com
Tue Mar 25 21:01:18 EDT 2008
Filipe Sousa wrote:
> Alan W. Irwin wrote:
>> On 2008-03-25 14:28-0400 Bill Hoffman wrote:
>>
>>> --- build all of paraview with nothing needing a build:
>>>
>>> 2.6
>>> make 15.21s user 5.55s system 74% cpu 28.049 total
>>> make 15.44s user 5.35s system 98% cpu 21.073 total
>
> make -j5
>
> real 6m13.039s
> user 20m42.308s
> sys 2m43.996s
>
>> user+system = 20.76s and 20.79s for the two runs.
>>>
>>> 2.4
>>> make 14.40s user 5.09s system 59% cpu 32.793 total
>>> make 14.73s user 4.74s system 98% cpu 19.684 total
>> user+system = 19.49s and 19.47s for the two runs
>
> make -j5
>
> real 6m14.700s
> user 20m39.125s
> sys 2m46.430s
>
Is that 6 minutes?? The test is to run make in a tree that has
everything already built. We not trying to measure the speed of the
compiler but rather the speed of make checking the depend information.
-Bill
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