[petsc-dev] Truly minimal configure

[Patrick Sanan]

> Am 15.03.2020 um 16:06 schrieb Jed Brown <jed at jedbrown.org>:
> 
> Patrick Sanan <patrick.sanan at gmail.com> writes:
> 
>> I want to generate docs/manualpages/htmlmap as quickly as possible, from scratch (a clone on ReadTheDocs), so I want a fast configure which will let me run "make allcite". 
>> 
>> The below will work, I think, but I'm curious whether there's an even faster known way.
>> 
>> Also note that I had to explicitly turn off some MKL stuff, because it's included by default and depends on blaslapack. 
>> 
>> 
>>                './configure',
>>                '--with-mpi=0',
>>                '--with-blaslapack=0',
>>                '--with-fortran=0',
>>                '--with-cxx=0',
>>                '--with-mkl_sparse_optimize=0',
>>                '--with-mkl_sparse=0',
> 
> These checks should probably be conditional on having found blaslapack,
> but you don't have a working PETSc this way (it'll fail to link
> examples), and as far as I can tell, you're just using configure to
> install sowing and not need to hack the makefiles to do the tree
> traversal without including $PETSC_ARCH/lib/petsc/conf/petscvariables.
> 
> This seems fine and we can eventually move to calling doctext from
> Python or doing its job in Python (as part of the last step, moving man
> pages to Sphinx).
> 
> At a high level, we see here that the cost of make allcite is dominated
> by recursive make tree traversal.
> 
> Overhead  Command  Shared Object                                                                                                                                                               
>  35.81%  sh       libc-2.31.so                                                                                                                                                                
>  13.31%  make     make                                                                                                                                                                        
>  11.18%  make     libc-2.31.so                                                                                                                                                                
>   7.63%  sh       ld-2.31.so                                                                                                                                                                  
>   5.84%  make     ld-2.31.so                                                                                                                                                                  
>   4.20%  doctext  doctext                                                                                                                                                                     
>   4.07%  doctext  libc-2.31.so                                                                                                                                                                
>   3.88%  doctext  ld-2.31.so                                                                                                                                                                  
>   3.64%  sh       bash                                                                                                                                                                        
>   2.79%  rm       libc-2.31.so                                                                                                                                                                
>   1.99%  rm       ld-2.31.so                                                                                                                                                                  
>   1.56%  sh       [unknown]                                                                                                                                                                   
>   1.14%  doctext  [unknown]                                                                                                                                                                   
>   0.56%  make     [unknown]                                                                                                                                                                   
>   0.55%  python   libpython3.8.so.1.0
How'd you get this timing?