[Mohammad74]

Hi,

I've encountered another problem with data transfer from the host to the nodes. Lets assume my code looks something like this:

DEFINE_ADJUST(name,libname)
{
   real a[4], b[4], c[4], V ;
   #if !RP_HOST
   /*I use nodes to calculate V*/
   #endif /*!RP_HOST*/
   node_to_host_real_1(V) ;
   #if !RP_NODE
   /* I use V to calculate a & b on the host process*/
   #endif /*!RP_NODE*/
   host_to_node_real(a,4) ;         /*solution is stuck here*/
   host_to_node_real(b,4) ;
   Message0("\n a[1] = %f\n", a[1]) ;      /*This line is not executed*/
   #if !RP_HOST
   /*Use a & b to calculate c on the nodes*/
   #endif /*!RP_HOST*/
}

All of the above works fine (a and b are filled with real numbers), until it reaches the first line with red comment and the solver gets stuck there without giving any errors whatsoever (I have to actually end the fluent process to force it to exit). Also, I'm not getting any errors during compilation. Whats wrong here? or how can I debug this since I'm not getting any errors?

[AlexanderZ]

the code you've showed seems to be correct.

issue could be with memory allocation.
you may check your arrays on the host with message macro

Message("\n a[1] = %f\n", a[1]) ;

if nothing works, fortunately our arrays has just 4 elements in each, so you may create separate variables for them and transfer to nodes separately

[Mohammad74]

Originally Posted by AlexanderZ

you may check your arrays on the host with message macro

Message("\n a[1] = %f\n", a[1]) ;

Thank you for answering,
but I did check them before posting my problem here. I can print the array elements from the host process, transfering them to nodes though, is not working properly for some reason.

[Mohammad74]

Update:

So, as a work around, instead of using "host_to_node_real" function, I used "PRF_CSEND_REAL(node_zero, &a, 4, myid)" to send the data from the host and then used "PRF_CRECV_REAL(host, &a, 4, host)" to receive it on the node_0. But now during compilation, I'm getting the "undeclared identifier" error for the host parameter. And I'm stuck again! :/

How to fix this?

[Mohammad74]

Originally Posted by Mohammad74

I'm getting the "undeclared identifier" error for the host parameter. And I'm stuck again! :/

After looking through para.h file from the fluent installation directory, I realized the correct variable that shows the host id is "node_host" not "host" (a mistake in udf manual). so the correct form is :

PRF_CRECV_REAL(node_host, &a, 4, node_host) ;

Which is then compiled with no errors.

However, using these "low level message passing macros" did not solve my problem mentioned in the beginning of this thread. Solver is still stuck at executing them