error when writing data

macfly · January 29, 2014, 18:09

Hi,

Fluent crashes when it tries to write data and I don't know why.
- Windows 8.1
- Ansys 14.5.7
- 3D model with turbulence, combustion, etc.
- Fluent launched in parallel mode and mesh automatically partitioned

Here is the message in the GUI:

Writing "| gzip -2cfv > D:\init.dat.gz"...

999999 (..\src\mpsystem.c@1172): mpt_read: failed: errno = 10054

999999: mpt_read: error: read failed trying to read 32 bytes: No such file or directory
MPI Application rank 0 exited before MPI_Finalize() with status -1073741819
The fl process could not be started.

Error: Error writing "| gzip -2cfv > D:\init.dat.gz".
Error Object: #f

Message from Cortex process==> Connection with host is broken. It may have crashed.

Any idea please??? Thx

diamondx · January 29, 2014, 20:59

it says no such file or directory ? is the d: and external hard drive ? may be it's unplugged ?
Have you tried another location ?

macfly · January 29, 2014, 23:26

No, I run a dummy test case with the same commands, same udf, and everything works fine.

It just doesn't work with my big model, although my model is not that big with 250000 cells and 10-12 variables.

It's very annoying and I read all kinds of half-answers going in every directions online... Confused and don't know what to do except lighten my model step-by-step and going by elimination.

macfly · January 29, 2014, 23:31

same problem in that thread, what the hell am I supposed to do with answer #2...?: http://www.cfd-online.com/Forums/flu...tml#post149284

diamondx · January 30, 2014, 12:24

he is refering to the type of MPI, when you launch FLUENT you get the right to choose in the parallel setting from diferrent king of mpi: pcmpi, intel...

macfly · January 30, 2014, 12:32

I always use pcmpi on Colosse, and you? If I use another mpi there is a message that recommends using pcmpi instead, somewhere in the output files..

From reading around, I think it has to do with the mesh partitioning. I added a line in my .jou telling Fluent to partition with another method than the default Metis. I'll see if it works.

I also read that it may be good to modify/save the case in serial, then launch it in parallel, for some obscure reasons...

diamondx · January 30, 2014, 12:39

[QUOTEI always use pcmpi on Colosse, and you?][/QUOTE]
me too.
Did you get this error message on colosse or you desktop ?

macfly · January 30, 2014, 12:43

both, local and Colosse

macfly · February 3, 2014, 16:23

In the end, it looks like the default 'Metis' mesh partitioning method was causing some data communication problems. I changed the partitioning method to 'Cartesian Axes' and the write-data doesn't cause me headaches anymore.

Couples of hours lost on that!

January 29, 2014, 18:09	error when writing data	#1
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	Hi, Fluent crashes when it tries to write data and I don't know why. - Windows 8.1 - Ansys 14.5.7 - 3D model with turbulence, combustion, etc. - Fluent launched in parallel mode and mesh automatically partitioned Here is the message in the GUI: Writing "\| gzip -2cfv > D:\init.dat.gz"... 999999 (..\src\mpsystem.c@1172): mpt_read: failed: errno = 10054 999999: mpt_read: error: read failed trying to read 32 bytes: No such file or directory MPI Application rank 0 exited before MPI_Finalize() with status -1073741819 The fl process could not be started. Error: Error writing "\| gzip -2cfv > D:\init.dat.gz". Error Object: #f Message from Cortex process==> Connection with host is broken. It may have crashed. Any idea please??? Thx

January 30, 2014, 12:24		#5
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	he is refering to the type of MPI, when you launch FLUENT you get the right to choose in the parallel setting from diferrent king of mpi: pcmpi, intel... __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

January 30, 2014, 12:39		#7
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	[QUOTEI always use pcmpi on Colosse, and you?][/QUOTE] me too. Did you get this error message on colosse or you desktop ? __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

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January 29, 2014, 20:59		#2
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	it says no such file or directory ? is the d: and external hard drive ? may be it's unplugged ? Have you tried another location ? __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

January 29, 2014, 23:26		#3
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	No, I run a dummy test case with the same commands, same udf, and everything works fine. It just doesn't work with my big model, although my model is not that big with 250000 cells and 10-12 variables. It's very annoying and I read all kinds of half-answers going in every directions online... Confused and don't know what to do except lighten my model step-by-step and going by elimination.

January 29, 2014, 23:31		#4
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	same problem in that thread, what the hell am I supposed to do with answer #2...?: http://www.cfd-online.com/Forums/flu...tml#post149284

January 30, 2014, 12:32		#6
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	I always use pcmpi on Colosse, and you? If I use another mpi there is a message that recommends using pcmpi instead, somewhere in the output files.. From reading around, I think it has to do with the mesh partitioning. I added a line in my .jou telling Fluent to partition with another method than the default Metis. I'll see if it works. I also read that it may be good to modify/save the case in serial, then launch it in parallel, for some obscure reasons...

January 30, 2014, 12:43		#8
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	both, local and Colosse

February 3, 2014, 16:23		#9
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	In the end, it looks like the default 'Metis' mesh partitioning method was causing some data communication problems. I changed the partitioning method to 'Cartesian Axes' and the write-data doesn't cause me headaches anymore. Couples of hours lost on that!