FDS Cluster OpenMP Disabled

[Mina Hany]

Hello, I have been trying to use fds cluster using 8 pcs connected together on a domain (windows 10) but everytime I ran a test, the OpenMp is always disabled 

then I tested it with only 1 PC so there is no firewall or anything that blocks any service and OpenMp is still always disabled when using Cluster

If I use normal FDS or FDS parallel, it works fine but on cluster it's always disabled.

I tried this on both CMDfds and Pyrosim, they both give the same result.

I am using FDS 6.7.9 

[Kevin McGrattan]

What command are you using in CMDfds?

[Mina Hany]

I used the command 

"  set OMP_NUM_THREADS=N "  to set number of threads then the command 

" mpiexec -wdir -machine hosts.txt fds job_name.fds"

to get my job to work
it always says openMP disabled 

so i thought maybe it's a problem with my fds file

but when I used "fds" command it always returns OpenMP disabled  

[Yuval Hirsch]

Do you use " mpiexec "?

On Fri, Jan 27, 2023 at 5:43 PM Kevin McGrattan <mcgr...@gmail.com> wrote:

What command are you using in CMDfds?

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[Mina Hany]

no, I didn't know about it (I'm fairly new to fds)

Is there a way to enable openMP from it ?

[Kevin McGrattan]

Try this

set OMP_NUM_THREADS=N 

mpiexec -wdir -machine hosts.txt fds_openmp job_name.fds

Starting with FDS 6.7.9, we now release a separate executable for OpenMP applications.

[Mina Hany]

thank you it worked on my laptop as I am currently not at work,

I don't understand why i can't set OpenMP before working the file,

like If I use  set OMP_NUM_THREADS=N  and then try fds it is still disabled

but when I use    

set OMP_NUM_THREADS=N 

mpiexec -wdir -machine hosts.txt fds_openmp job_name.fds

unseperated it works
I'll try it at work and then update you

[Kevin McGrattan]

As I said, we now compile a separate executable for OpenMP applications. fds.exe is compiled without the OpenMP libs. fds_openmp.exe is compiled with the OpenMP libs.

[Mina Hany]

I didn't notice the difference at first.
Thank you for your time.

[Mina Hany]

Is there a way to run the cluster on pyrosim with openMP as it seems the new fds_openMP isn't implemented there ?

[Kevin McGrattan]

I don't know what kind of support PyroSim provides for running jobs on multiple Windows computers. Check with Thunderhead directly.

[Mina Hany]

okay thank you

[Mina Hany]

I wanted to update that I found a solution, just change the executable fds.exe from the preference from fds.exe to fds_openmp.exe