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

[Matthew Knepley]

On Sat, Apr 28, 2018 at 5:58 AM, Adrian Bunk <bunk at debian.org> wrote:

> On Fri, Apr 27, 2018 at 09:48:17AM +0800, 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?
> >...
>
> mips and mipsel are the only architectures where we have only 2 GB
> address space for userspace, so when the compiler needs more than
> 2 GB of memory you are getting this error.
>
> On other 32bit buildds you have 3 GB or even 4 GB address space,
> mips/mipsel is the canary for huge memory usage.
>
> gcc sometimes has huge memory usage compiling C++ hitting this 2 GB
> limit, it is possible that there are also problems with Fortran code.
>
> It is very annoying that the buildd log hides the compiler flags,
> if you fix that I'll take a look regarding a workaround.
>

make V=1

  Matt


> cu
> Adrian
>
> --
>
>        "Is there not promise of rain?" Ling Tan asked suddenly out
>         of the darkness. There had been need of rain for many days.
>        "Only a promise," Lao Er said.
>                                        Pearl S. Buck - Dragon Seed
>
>


-- 
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.caam.rice.edu/~mk51/>
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