[petsc-dev] PETSc always recompiles mpi4py petsc4py even when it does not have too

[Barry Smith]

14 characters when 4 does the trick. Eventually I'll fix the petsc4py build, it is now part of PETSc so should behave as well as the rest of PETSc.



> On Oct 11, 2020, at 8:30 AM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> On Sun, Oct 11, 2020 at 9:18 AM Jed Brown <jed at jedbrown.org <mailto:jed at jedbrown.org>> wrote:
> Not unless you pass -j (or export it in MAKEFLAGS).
> 
> So just run make -f ./gmakefile -j 8 if you want a parallel build?
> 
>   Matt
>  
> On Sun, Oct 11, 2020, at 6:51 AM, Matthew Knepley wrote:
>> On Sun, Oct 11, 2020 at 4:35 AM Barry Smith <bsmith at petsc.dev <mailto:bsmith at petsc.dev>> wrote:
>> 
>> 
>>> On Oct 11, 2020, at 2:50 AM, Pierre Jolivet <pierre at joliv.et <mailto:pierre at joliv.et>> wrote:
>>> 
>>> This actually applies to all packages with builtafterpetsc = 1.
>> 
>>   Yes, but now that petsc4py is part of the PETSc repository I would like to just alway have it turned on so now the rebuild is annoying.
>> 
>>> I think you want to do make libs instead of make all?
>> 
>>   The problem is make libs is not parallel so much slower?
>> 
>> make -f ./gmakefile is not parallel?
>> 
>>   Matt
>>  
>>   Barry
>> 
>>> 
>>> Thanks,
>>> Pierre
>>> 
>>>> On 11 Oct 2020, at 9:36 AM, Barry Smith <bsmith at petsc.dev <mailto:bsmith at petsc.dev>> wrote:
>>>> 
>>>> 
>>>>   I change a single PETSc file and do make all that single file gets compiled but all of mpi4py and petsc4py get recompiled even though I have not changed any thing to affect them. No include files for example
>>>> 
>>>> 
>>>> *** Building mpi4py ***
>>>> *** Installing mpi4py ***
>>>> =====================================
>>>> To use mpi4py, add /Users/barrysmith/Src/petsc/arch-cleanup-dmd-domaindecomposition/lib to PYTHONPATH
>>>> =====================================
>>>> *** Building petsc4py ***
>>>> 
>>> 
>>> 
>> 
>> 
>> 
>> 
>> -- 
>> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
>> -- Norbert Wiener
>> 
>> https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener
> 
> https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>

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