do something about the pari overflow test

[williamstein]

This disturbs people:

sage -t  devel/sage-main/sage/libs/pari/gen.pyx             python(85565) malloc: *** mmap(size=4096000000) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug

This would disturb people less:

[[The following doctest contains an intentional memory error.]]
sage -t  devel/sage-main/sage/libs/pari/gen.pyx             python(85565) malloc: *** mmap(size=4096000000) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug

Component: doctest coverage

Issue created by migration from https://trac.sagemath.org/ticket/1595

[sagetrac-mabshoff]

comment:1

The issue has been added to the FAQ. It might be easiest to direct stderr to some file. That way people should never see the offending message.

Cheers,

Michael

[sagetrac-mabshoff]

comment:3

On OSX 10.5 64 bit, FreeBSD 7 as well as Solaris Sparc this overflow test leads to a segfault/failed test. I am not sure what to do with this test since the fact that it worked purely depends on the OS behavior for large allocs.

Maybe making it "optional -- large" or "optional -- $SOME_OS_LIST" would be a way out of this. Anyway, there seems to be no reliable way to test the allocation of huge amounts of memory and expect the Sage session to survive.

Cheers,

Michael

[williamstein]

comment:4

Attachment: gen.patch.gz

[sagetrac-mabshoff]

comment:5

Positive review.

Cheers,

Michael

[sagetrac-mabshoff]

comment:6

Oops, change the summary, too.

Cheers,

Michael

[sagetrac-mabshoff]

comment:7

Ooops, this patch needs to be rebased for 3.4.1.rc1 - new patch coming up in the morning.

Cheers,

Michael

[sagetrac-mabshoff]

comment:8

Attachment: trac_1595-rebase.patch.gz

Merged trac_1595-rebase.patch in Sage 3.4.1.rc2.

Cheers,

Michael