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Vitaly June 1, 2012 17:03

UDF in parallel (fscanf)

I have a UDF that's using an fscanf function to scan a file with point coordinates. Everything works great in Serial, but when simulating in parallel (even with only 1 processor), specifically the fscanf function is causing the following error output:

0 (..\src\mpsystem.c@1173): mpt_read: failed: errno = 10054

0: mpt_read: error: read failed trying to read 4 bytes: No such file or directory
MPI Application rank 0 exited before MPI_Finalize() with status -1
The Parallel FLUENT process could not be started.

The function is being executed by the host.

Has anyone seen this?



gi12 October 10, 2012 05:21

Dear Vitaly,

If you solved your problem can you please let me know how, as I have similar error with fscanf

Many thanks,

Vitaly October 10, 2012 14:18

Hi GI,

To be honest, I don't remember exactly what I did. Looking at my code, I the format looks like this:

real input[N];

cfPtr = fopen("finle_name.txt", "r");
for (i = 0; i<N; i++)


To be honest, I have not looked at this code in a while and don't currently have Fluent installed to check it. In fact, I found it on an old printout that I had in my desk. Nevertheless, I think it worked for me.
I should say that I would get very frustrated with Fluent compiler. Even when I took a UDF class at ANSYS, the instructor was getting frustrated also because simple function would not work. Sometimes I would try the exact same UDF on a different computer in my lab (with Fluent) and it would work with no problem!

I know this is not an ideal explanation, but I hope it helps!

Good luck!


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