Re: Problems with IBM T40p

Hi Fabrice,

The machines have 1GB of ram (twice what is standard) the modules are
from IBM (not third party). At the moment I am running the same job
on a Toshiba Tecra S1 Pentium M notebook with 1GB ram also - seems to
be going ok so far....

The exception is now identified it is memory access violation and the
address of the exception is always somewhere inside either the cplex
dll or the cplex interactive optimiser.

Peter Cupit


Fabrice Bellet <> wrote in message news:<bci7qm$fn0$>...
> Hello,
>
> Peter Cupit <> wrote:
> > The problem we are having is that an optimization procedue using ILOG
> > Cplex is halting before completion with an unidentified exception. The
> > way this works is that a scenario is set up in cplex and then cplex is
> > instructed to solve, cplex then performs the optimization. The job is
> > very CPU intensive and runs for many hours. (Cplex is Version 8.0).
> >
> > The current status of this problem is that we can run the same
> > scenario on more than one other computer and all is ok. When it is run
> > on the laptops (we have tested it on three of the T40p's) the job
> > stops after generating an unknown exception. It stops after a couple
> > of hours usually. The same optimization problem can be run in a
> > reduced form and this works ok (takes < 10 minutes).
>
> What is the memory configuration of these machines ? Do you
> have supplementary memory modules ?

Hi Fabrice,

We tried with 512MB as you suggested and all was ok. One of the
laptops is now with IBM. Another application we use also fails with a
memory error. At present I am removing 512MB from machines until we
get replacements.

Thanks for your info.

Cheers,

Peter Cupit



Fabrice Bellet <> wrote in message news:<bdc42k$2qe1$>...
> Peter Cupit <> wrote:
> > The machines have 1GB of ram (twice what is standard) the modules are
> > from IBM (not third party). At the moment I am running the same job
> > on a Toshiba Tecra S1 Pentium M notebook with 1GB ram also - seems to
> > be going ok so far....
> >
> > The exception is now identified it is memory access violation and the
> > address of the exception is always somewhere inside either the cplex
> > dll or the cplex interactive optimiser.
>
> It could be a memory problem. I experienced problems with Linux on my new
> T40 too. The supplementary 512MB memory chip (from IBM too) was buggy.
> Running with only 512MB appeared to be stable. IBM France changed the
> supplementary module, and the laptop now works fine again.
>
> More details here :
> http://bellet.info/~bellet/laptop/t4...ory%20problems
>
> I had random crashes with Linux, the included PC-Doctor memory diagnostic
> tool didn't find anything. Only memtest86 (www.memtest86.com) discovered
> those subtle memory errors.