X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/9932a0c0d2c44e34633c97a827b2b04d615cb4e9..dc7418e3309ec6ac15b54b32e290e4d3240f8f63:/src/smpi/smpi_base.c diff --git a/src/smpi/smpi_base.c b/src/smpi/smpi_base.c index c75e51dabf..a31b752314 100644 --- a/src/smpi/smpi_base.c +++ b/src/smpi/smpi_base.c @@ -7,6 +7,7 @@ #include "private.h" #include "xbt/virtu.h" #include "mc/mc.h" +#include "mc/mc_replay.h" #include "xbt/replay.h" #include #include "simix/smx_private.h" @@ -134,12 +135,19 @@ static double smpi_os(double size) unsigned int iter = 0; s_smpi_factor_t fact; double current=0.0; + // Iterate over all the sections that were specified and find the right + // value. (fact.factor represents the interval sizes; we want to find the + // section that has fact.factor <= size and no other such fact.factor <= size) + // Note: parse_factor() (used before) already sorts the dynar we iterate over! xbt_dynar_foreach(smpi_os_values, iter, fact) { - if (size <= fact.factor) { + if (size <= fact.factor) { // Values already too large, use the previously + // computed value of current! XBT_DEBUG("os : %f <= %ld return %f", size, fact.factor, current); return current; }else{ - current=fact.values[0]+fact.values[1]*size; + // If the next section is too large, the current section must be used. + // Hence, save the cost, as we might have to use it. + current = fact.values[0]+fact.values[1]*size; } } XBT_DEBUG("os : %f > %ld return %f", size, fact.factor, current); @@ -156,12 +164,19 @@ static double smpi_ois(double size) unsigned int iter = 0; s_smpi_factor_t fact; double current=0.0; + // Iterate over all the sections that were specified and find the right + // value. (fact.factor represents the interval sizes; we want to find the + // section that has fact.factor <= size and no other such fact.factor <= size) + // Note: parse_factor() (used before) already sorts the dynar we iterate over! xbt_dynar_foreach(smpi_ois_values, iter, fact) { - if (size <= fact.factor) { + if (size <= fact.factor) { // Values already too large, use the previously + // computed value of current! XBT_DEBUG("ois : %f <= %ld return %f", size, fact.factor, current); return current; }else{ - current=fact.values[0]+fact.values[1]*size; + // If the next section is too large, the current section must be used. + // Hence, save the cost, as we might have to use it. + current = fact.values[0]+fact.values[1]*size; } } XBT_DEBUG("ois : %f > %ld return %f", size, fact.factor, current); @@ -178,12 +193,20 @@ static double smpi_or(double size) unsigned int iter = 0; s_smpi_factor_t fact; double current=0.0; + // Iterate over all the sections that were specified and find the right + // value. (fact.factor represents the interval sizes; we want to find the + // section that has fact.factor <= size and no other such fact.factor <= size) + // Note: parse_factor() (used before) already sorts the dynar we iterate over! xbt_dynar_foreach(smpi_or_values, iter, fact) { - if (size <= fact.factor) { + if (size <= fact.factor) { // Values already too large, use the previously + // computed value of current! XBT_DEBUG("or : %f <= %ld return %f", size, fact.factor, current); return current; - }else + } else { + // If the next section is too large, the current section must be used. + // Hence, save the cost, as we might have to use it. current=fact.values[0]+fact.values[1]*size; + } } XBT_DEBUG("or : %f > %ld return %f", size, fact.factor, current); @@ -195,7 +218,12 @@ double smpi_mpi_wtime(){ if (smpi_process_initialized() && !smpi_process_finalized() && !smpi_process_get_sampling()) { smpi_bench_end(); time = SIMIX_get_clock(); - //to avoid deadlocks if called too many times + // to avoid deadlocks if used as a break condition, such as + // while (MPI_Wtime(...) < time_limit) { + // .... + // } + // because the time will not normally advance when only calls to MPI_Wtime + // are made -> deadlock (MPI_Wtime never reaches the time limit) if(smpi_wtime_sleep > 0) simcall_process_sleep(smpi_wtime_sleep); smpi_bench_begin(); } else { @@ -743,8 +771,12 @@ int smpi_mpi_test(MPI_Request * request, MPI_Status * status) { //assume that request is not MPI_REQUEST_NULL (filtered in PMPI_Test or smpi_mpi_testall before) - //to avoid deadlocks - //multiplier to the sleeptime, to increase speed of execution, each failed test will increase it + // to avoid deadlocks if used as a break condition, such as + // while (MPI_Test(request, flag, status) && flag) { + // } + // because the time will not normally advance when only calls to MPI_Test + // are made -> deadlock + // multiplier to the sleeptime, to increase speed of execution, each failed test will increase it static int nsleeps = 1; if(smpi_test_sleep > 0) simcall_process_sleep(nsleeps*smpi_test_sleep); @@ -853,8 +885,9 @@ void smpi_mpi_iprobe(int source, int tag, MPI_Comm comm, int* flag, MPI_Status* MPI_Request request =build_request(NULL, 0, MPI_CHAR, source == MPI_ANY_SOURCE ? MPI_ANY_SOURCE : smpi_group_index(smpi_comm_group(comm), source), smpi_comm_rank(comm), tag, comm, PERSISTENT | RECV); - //to avoid deadlock, we have to sleep some time here, or the timer won't advance and we will only do iprobe simcalls - //multiplier to the sleeptime, to increase speed of execution, each failed iprobe will increase it + // to avoid deadlock, we have to sleep some time here, or the timer won't advance and we will only do iprobe simcalls + // (especially when used as a break condition, such as while(MPI_Iprobe(...)) ... ) + // multiplier to the sleeptime, to increase speed of execution, each failed iprobe will increase it static int nsleeps = 1; if(smpi_iprobe_sleep > 0) simcall_process_sleep(nsleeps*smpi_iprobe_sleep); // behave like a receive, but don't do it @@ -862,31 +895,31 @@ void smpi_mpi_iprobe(int source, int tag, MPI_Comm comm, int* flag, MPI_Status* print_request("New iprobe", request); // We have to test both mailboxes as we don't know if we will receive one one or another - if (sg_cfg_get_int("smpi/async_small_thres")>0){ - mailbox = smpi_process_mailbox_small(); - XBT_DEBUG("trying to probe the perm recv mailbox"); - request->action = simcall_comm_iprobe(mailbox, 0, request->src, request->tag, &match_recv, (void*)request); - } - if (request->action==NULL){ - mailbox = smpi_process_mailbox(); - XBT_DEBUG("trying to probe the other mailbox"); - request->action = simcall_comm_iprobe(mailbox, 0, request->src,request->tag, &match_recv, (void*)request); - } + if (sg_cfg_get_int("smpi/async_small_thres")>0){ + mailbox = smpi_process_mailbox_small(); + XBT_DEBUG("trying to probe the perm recv mailbox"); + request->action = simcall_comm_iprobe(mailbox, 0, request->src, request->tag, &match_recv, (void*)request); + } + if (request->action==NULL){ + mailbox = smpi_process_mailbox(); + XBT_DEBUG("trying to probe the other mailbox"); + request->action = simcall_comm_iprobe(mailbox, 0, request->src,request->tag, &match_recv, (void*)request); + } - if(request->action){ + if (request->action){ MPI_Request req = (MPI_Request)SIMIX_comm_get_src_data(request->action); *flag = 1; if(status != MPI_STATUS_IGNORE && !(req->flags & PREPARED)) { status->MPI_SOURCE = smpi_group_rank(smpi_comm_group(comm), req->src); - status->MPI_TAG = req->tag; - status->MPI_ERROR = MPI_SUCCESS; - status->count = req->real_size; + status->MPI_TAG = req->tag; + status->MPI_ERROR = MPI_SUCCESS; + status->count = req->real_size; } nsleeps=1;//reset the number of sleeps we will do next time } else { - *flag = 0; - nsleeps++; + *flag = 0; + nsleeps++; } smpi_mpi_request_free(&request);