[mpich-discuss] Unstable programs

[Jayesh Krishna]

 Hi,
  If possible send us your program (src code) and we can look into it.

Regards,
Jayesh

-----Original Message-----
From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Gib Bogle
Sent: Thursday, May 01, 2008 10:45 PM
To: mpich-discuss at mcs.anl.gov
Subject: [mpich-discuss] Unstable programs

I am getting bizarre behaviour with Intel Fortran and Windows on a
quad-core machine.  My program fails in a wide variety of ways.  Sometimes
it is access violation, sometimes a stack overflow. 
Sometimes it runs successfully but I can see that some variables have been
clobbered.  I have all compiler runtime checking turned on, and in some
situations an out-of-range array index is trapped, but the reason for the
array error is quite obscure, except that it occurs after an MPI call. 
Attempts to pin down these errors by adding write statements usually have
the effect of pushing the error somewhere else - Heisenbugs.

There is always the possibility - usually a high probability - of operator
error, but I've been working on this intensively for several days, and the
variety and slipperiness of the errors is making me wonder whether the
fault is perhaps not with my code, which is not very complex.  I'd like to
know if others are using MPICH2 with Fortran under Windows, and what their
experience has been.

Thanks
Gib


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/mpich-discuss/attachments/20080502/7e9dca35/attachment.htm>