MPI: barriers in Java

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MPI: barriers
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In MPI, a barrier is invoked by calling the function
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MPI Barrier(MPI COMM)
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where MPI_COMM is a communicator defining the process group and the communication context All processes in the group associated with the communicator participate in the barrier Although it might not be apparent to the programmer, the barrier itself is almost always implemented with a cascade of pairwise messages using the same techniques as used in a reduction (see the discussion of reduction in Sec 642)
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Figure 63 MPI program containing a barrier This program is used to time the execution of function runit()
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#include <mpih> // MPI include file #include <stdioh> extern void runit(); int main(int argc, char **argv) {
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int num_procs; // number of processes in the group int ID; // unique identifier ranging from 0 to (num_procs-l) double time_init, time_final, time_elapsed; // // Initialize MPI and set up the SPMD program // MPI_Init(&argc,&argv); MPI_Comm_rank(MPI_COMM_WORLD, &ID); MPI_Comm_size (MPI_COMM_WORLD, &num_procs); // // Ensure that all processes are set up and ready to go before timing // runit () // MPI_Barrier(MPI_COMM_WORLD); timeinit = MPI_Wtime(); runit(); // a function that we wish to time on each process time_final = MPI_Wtime(); time_elapsed = time_final - time_init; printf(" I am \%d and my computation took \%f seconds\n", ID, time_elapsed); MPI-Finalize(); return 0;
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As an example of a barrier, consider the program in Fig 63 This simple program sets up the MPI environment and then records the execution time of a function called runit( ) (the code of which is not shown) The time itself is found using the MPI timing routine:
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MPI Wtime()
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This function returns a double precision value holding the elapsed time in seconds since some point in the past The difference between the value returned after the function call and the value returned before the function call gives the elapsed time for the function's execution This is wall clock time, that is, the time that would elapse on a clock external to the computer There can be considerable variation in process startup or the initialization of MPI Thus, for the time to be consistent across all the processes, it is important that all processes enter the timed section of code together To address this issue, we place a barrier before the timed section of code
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OpenMP: barriers
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In OpenMP, a simple pragma sets the barrier:
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#pragma omp barrier
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All threads in the team participate in the barrier As an example of a barrier, consider the code in Fig 64 This program is essentially the same as the MPI program A barrier is used to ensure that all threads complete any startup activities before the timing measurements are taken The timing routine, omp_Wtick(), was modeled after the analogous MPI routine, MPI_Wtime(), and is defined in the same way
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Figure 64 OpenMP program containing a barrier This program is used to time the execution of function runit()
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#include <omph> #include <stdioh> extern void runit(); int main(int argc, char **argv) { double time_init, time_final, time_elapsed; #pragma omp parallel private(time_init, time_final, time_elapsed) { int ID; ID = omp_get_thread_num(); // // ensure that all threads are set up and ready to go before timing runit() // #pragma omp barrier time_init = omp_get_wtime(); runit(); // a function that we wish to time on each thread time_final = omp_get_wtime(); time_ elapsed = time_final - time_init; printf(" I am %d and my computation took \%f seconds\n", ID, time_elapsed);
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} return (); }
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In addition to an explicit barrier as shown in Fig 64, OpenMP automatically inserts barriers at the end of the worksharing constructs (for, single, section, etc) This implicit barrier can be disabled, if desired, by using the nowait clause The barrier implies a call to flush, so the OpenMP barrier creates a memory fence as well These memory flushes, combined with any cycles wasted while UEs wait at the barrier, make it a potentially expensive construct Barriers, which are expensive in any programming environment, must be used
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where required to ensure the correct program semantics, but for performance reasons should be used no more than absolutely required