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SubjectRe: Subtle MM bug
On Mon, 8 Jan 2001, Wayne Whitney wrote:

> On Mon, 8 Jan 2001, Szabolcs Szakacsits wrote:
>
> > AFAIK newer glibc = CVS glibc but the malloc() tune parameters work
> > via environment variables for the current stable ones as well,
>
> I'll arrange a binary linked against glibc2.2, and then your suggestion
> will hopefully do the trick. Thanks for your kind help!

OK, I now have a binary dynamically linked against /lib/libc.so.6,
(according to ldd), and that points to glibc-2.1.92. And I tried setting
the environment variables you suggested, I checked that they are set and
checked that they appear in /lib/libc.so.6. But the behaviour is
unchanged: MAGMA still hits this barrier at 830M (not 870M, that was a
typo).

I guess I conclude that either (1) MAGMA does not use libc's malloc
(checking on this, I doubt it) or (2) glibc-2.1.92 knows of these
variables but has not yet implemented the tuning (I'll try glibc-2.2) or
(3) this is not the problem.

I'll look at Andrea's hack as well. Thanks for everybody's help!

Cheers, Wayne






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