Bug#897006: [petsc-maint] Bug#897006: petsc FTBFS on mips: f951: out of memory

[Satish Balay]

We've received a couple of similar reports on regular [amd64] builds
on VMs. And increasing memory allocated to the VM alleviated the
problem

We don't know why gfortran is requiring so much memory to compile these
module files.

Satish

On Fri, 27 Apr 2018, Drew Parsons wrote:

> Source: petsc
> Version: 3.9.0+dfsg1-1exp4
> Severity: normal
> 
> PETSc 3.9 Fails To Build From Source on mips. PETSC 3.8 continues to build fine.
> 
> Build logs are at
>   https://buildd.debian.org/status/logs.php?pkg=petsc&arch=mips
> e.g.
>   https://buildd.debian.org/status/fetch.php?pkg=petsc&arch=mips&ver=3.9.0%2Bdfsg1-1exp4&stamp=1524789882&raw=0
> 
> The build log reports
> -====
> ...
>          CXX mips-linux-gnu-real-debug/obj/tao/linesearch/interface/dlregis_taolinesearch.o
>          CXX mips-linux-gnu-real-debug/obj/tao/linesearch/impls/gpcglinesearch/gpcglinesearch.o
>          CXX mips-linux-gnu-real-debug/obj/tao/linesearch/interface/ftn-auto/taolinesearchf.o
>          CXX mips-linux-gnu-real-debug/obj/tao/linesearch/interface/ftn-custom/ztaolinesearchf.o
>          CXX mips-linux-gnu-real-debug/obj/tao/linesearch/interface/taolinesearch.o
>          CXX mips-linux-gnu-real-debug/obj/tao/leastsquares/impls/pounders/gqt.o
>          CXX mips-linux-gnu-real-debug/obj/tao/leastsquares/impls/pounders/pounders.o
>           FC mips-linux-gnu-real-debug/obj/mat/f90-mod/petscmatmod.o
>           FC mips-linux-gnu-real-debug/obj/dm/f90-mod/petscdmmod.o
> 
> f951: out of memory allocating 2097152 bytes after a total of 1844178944 bytes
> make[4]: *** [gmakefile:164: mips-linux-gnu-real-debug/obj/dm/f90-mod/petscdmmod.o] Error 1
> -====
> 
> Looks like the fortran module for petscdm has gotten bigger than it
> used to be.
> 
> Nevertheless, on amd64 the 3.9 library is 15539008 bytes,  while 3.8 was 14727872,
> not much smaller.  The amd64 3.9 debug library is 86882368 bytes where 3.8
> was 84142848.
> 
> On mips the 3.8 debug library is 68622188 bytes, smaller than amd64.
> Is this out-of-memory error a problem with the mips buildds? Are there
> buildd memory constraints we're hitting against? Or is there a problem with
> fortran95 on mips?
> 
> I'm cc:ing upstream to keep them informed.
>