Re: [Ceph-maintainers] Bug#849657: ceph: FTBFS on mips(el): g++: virtual memory exhausted: Cannot allocate memory

Aurelien Jarno <[email protected]> writes:

> On 2017-01-05 14:00, Gaudenz Steinlin wrote:
>> 
>> Hi
>> 
>> Aurelien Jarno <[email protected]> writes:
>> 
>> > On 2016-12-30 10:06, Emilio Pozuelo Monfort wrote:
>> >> On 29/12/16 20:56, Gaudenz Steinlin wrote:
>> >
>> > The problem is indeed a memory issue, not that the buildd doesn't have
>> > enough memory, but just that you can allocate only 2GB per process on a
>> > 32-bit MIPS machine. As Emilio said, the above GCC flag should help to
>> > reduce the memory usage by running the garbage collector more often.
>> >
>> > However gcc 6.3 seems to have improved the situation a bit, so I given
>> > back the packages, I hope they will build now. Otherwise I have a patch
>> > ready to change the GCC defaults. That said GCC upstream consider it's a
>> > bug in the garbage collector [1], so that should be fixed instead and the
>> > patch should be considered as a temporary workaround.
>> >
>> 
>> Aurelien thanks for taking care and resheduling the build. Unfortunately
>> this did not solve the problem. But setting the following variables
>> solves the virtual memory issue for me on the mipsel porterbox (eller):
>> 
>> export DEB_CFLAGS_MAINT_APPEND= --param ggc-min-expand=10 -O1
>> export DEB_CXXFLAGS_MAINT_APPEND= --param ggc-min-expand=10 -O1
>> export DEB_CFLAGS_MAINT_STRIP= -O2
>> export DEB_CXXFLAGS_MAINT_STRIP= -O2
>
> Thanks for testing that.
>
> I have found that the issue is also workarounded by keeping -O2 and
> --param ggc-min-expand=5, which is a quite aggressive value. The patch I
> have for GCC reduced the value to 30 (which corresponds to disabling the
> heuristics). Also note that the build failure actually only concern the
> testsuite, the code itself builds without any change.

Thanks for the hint. I'll try another upload with --param
ggc-min-expand=5. Unfortunately there is no easy way to disable the
testsuite build without also disabling some debug binaries that are part
of the binary packages.

Gaudenz