c++ - MPI multiple send and receive in loop -

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i have big problem code , maybe conceptually. need work done in 2 different functions. 1 function has 1 instance , main thread, , second function has many instances on many other nodes.

one of functions (function a) sending 3 parts of data nodes, , other function, b, should receive @ each node. next, function should wait results. when ready functions b in each of nodes should send 1 part of data function a, , starts again.

it should work in sample code:

void preparedata() { //function   for(int = 1 ; < threads;i++) {     mpi_send(...); //first part of data     mpi_send(...); //second part of data     mpi_send(...); //third part of dat   }   //here function (a) should wait because second function (b) computing data   for(int i=1;i<threads;i++) {     mpi_recv(...); //receiving data function b   } }  void computedata() { //function b   while(isdone) {     mpi_recv(...); //first part of data     mpi_recv(...); //second part of data     mpi_recv(...); //third part of data   //here data computed , sending main function     mpi_send(...); //sending data function  } }

does know how , mpi function should use , how?

well, happens when try approach describe?

are using threads here or conflating threaded programming message passing? idiomatic mpi more like

for(int = 1 ; < nprocs;i++) { ... }

send might block, should use isend , test/wait completion.


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