the mastersRequests variable is declared within this function, so any loop
within this function should have access to it. mastersRequests is supposed
to be an array of MPI_Requests, declared like this:
MPI_Status status[NUMBER_OF_SLAVES];
MPI_Request mastersRequests[NUMBER_OF_SLAVES];
Result recvResult[NUMBER_OF_SLAVES];
**********************************
Original message:
Hi,
I'm not sure on what i'll say because i don't
know c that much (unfortunately)...
Perhaps the variable &mastersRequests is valid inside
the for() and you can't access to it outside the cicle;
it's not a global variable, that's what i mean...
But i'm not sure as i said because i never know the scope
where the variables are valid or not!!!
regards, nelson
-----Original Message-----
From: William Boatin [mailto:wboatin_at_xxxxxxxxxxx]
Sent: Tue 15-Jul-03 8:59 PM
To: lam_at_xxxxxxxxxxx
Cc:
Subject: LAM: MPI_Startall error in LAM/MPI 6.5.9
I attempted to use the MPI_Startall command as follows:
for (iSlave = 1; iSlave < iSize; iSlave++)
{
// build handles for the receipt of results
MPI_Recv_init(&recvResult[iSlave],
1,
MPI_ResultType,
iSlave,
RESULTTAG,
MPI_COMM_WORLD,
&mastersRequests[iSlave]);
}
MPI_Startall(iSize - 1, mastersRequests);
the code compiled fine, but when i tried to run the code(using mpirun -c 2
<program name>, i got the following error:
MPI process rank 0 (n0, p4837) caught a SIGSEGV in MPI_Startall.
Rank (0, MPI_COMM_WORLD): Call stack within LAM:
Rank (0, MPI_COMM_WORLD): - MPI_Startall()
Rank (0, MPI_COMM_WORLD): - main()
-----------------------------------------------------------------------------
One of the processes started by mpirun has exited with a nonzero exit
code. This typically indicates that the process finished in error.
If your process did not finish in error, be sure to include a "return
0" or "exit(0)" in your C code before exiting the application.
PID 4837 failed on node n0 with exit status 1.
-----------------------------------------------------------------------------
i tried changing the startall command and moving it up into the loop so it
looks like so:
MPI_Start(&mastersRequests[iSlave]);
and that seemed to work (at least i got passed this point). what gives?
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