[FLASH-USERS] Big Problem??

[Seyit Hocuk]

Hi Nathan,

Thats a good Idea, I'll start simple and test those first thing monday. 
It's too late for me now.

To answer your questions:

The problem I am running is my own home made, actually it's a modified 
version of Jeans. Basically including heat, cool, eos gamma, 
compositions, adjusted refinement criteria similar to one of the other 
problems (with delta_ref and delta_deref) and a scala of other small things.

1)
Centos5
Linux celsius 2.6.18-53.1.19.el5 #1 SMP Wed May 7 08:20:19 EDT 2008 i686 
i686 i386 GNU/Linux
ifort intel compiler version 8.0
hdf5 1.6.6 (serial)
mpich2 Version:  1.0.3
gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)
FFLAGS_OPT   =  -c -r8 -i4 -fast -ipo -ipo_obj  -I $(MPI_PATH)/include

2)
Debian (??)
Linux hpcibm1 2.6.8-11-amd64-k8-smp #1 SMP Sun Oct 2 20:03:22 UTC 2005 
x86_64 GNU/Linux
pgf90 6.0-5 32-bit target on x86-64 Linux
hdf5 1.4.5 (serial)
mpich2 version 1.0.5
gcc version 3.3.5 (Debian 1:3.3.5-13)
FFLAGS_OPT = -c -fast -r8 -i4

3)
Ubuntu
Linux si01 2.6.24.3 #1 SMP Fri Jul 4 11:02:09 CEST 2008 x86_64 GNU/Linux
ifort intel compiler version 10.1.012
hdf5 1.6.7 (serial)
mpich2 Version: 1.0.6
gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)
FFLAGS_OPT   = -c -r8 -i4  -xT -O3 -no-prec-div -static -I 
$(MPI_PATH)/include
or (only -ipo difference, result seemingly doesn't change)
FFLAGS_OPT   = -c -r8 -i4  -fast -I $(MPI_PATH)/include




Nathan Hearn wrote:
> Hi Seyit,
>
>     Are you seeing these differences in the standard test problems
> included in Flash (e.g., Noh, Sod, Sedov), or are they specific to the
> problem that you are running.  (Really, this follows from Tomek's
> advice to look at the simplest configurations where the differences
> are seen.)
>
>     Also, it would be good to include some more information in your
> messages, for instance: the problem that you are running, the specific
> architectures and compilers, the optimization flags, and the library
> versions for HDF5 and MPI that you are using.  Details like these can
> be really helpful in evaluating and fixing the issues you are seeing.
>
>
> - Nathan
>
>
> On Fri, Jul 18, 2008 at 11:32 AM, Seyit Hocuk <seyit at astro.rug.nl> wrote:
>   
>> Oh man,
>>
>> I am using 3 different computers (with different architectures, compilers,
>> optimizations, environments). All three start differently immediately from
>> the beginning (difference in dt_hydro and refinement).
>> Should I worry very very very much?
>> I'm now doing a complete simulation and am going to check if my end results
>> also change.
>>
>> I'm trembling by the thought.....
>>