adding the code to manage the communicator cid allocation in multithreaded scenarios. The code seems to work in a single threaded scenario (and thus should not generate any errors hopefully), the multithreaded case still to be tested.
This commit was SVN r2792.
Этот коммит содержится в:
Edgar Gabriel
родитель
479f6c5e6b
Коммит
e1406a1d5d
@ -12,6 +12,7 @@
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#include "proc/proc.h"
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#include "include/constants.h"
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#include "class/ompi_pointer_array.h"
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#include "class/ompi_list.h"
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#include "mca/pcm/pcm.h"
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#include "mca/pml/pml.h"
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#include "mca/coll/coll.h"
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@ -67,11 +68,27 @@ static int ompi_comm_allreduce_intra_oob (int *inbuf, int* outbuf,
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void* remote_leader,
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int send_first );
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static int ompi_comm_register_cid (uint32_t contextid);
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static int ompi_comm_unregister_cid (uint32_t contextid);
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static uint32_t ompi_comm_lowest_cid ( void );
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struct ompi_comm_reg_t{
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ompi_list_item_t super;
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uint32_t cid;
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};
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typedef struct ompi_comm_reg_t ompi_comm_reg_t;
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OBJ_CLASS_DECLARATION(ompi_comm_reg_t);
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static void ompi_comm_reg_constructor(ompi_comm_reg_t *regcom);
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static void ompi_comm_reg_destructor(ompi_comm_reg_t *regcom);
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OBJ_CLASS_INSTANCE (ompi_comm_reg_t,
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ompi_list_item_t,
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ompi_comm_reg_constructor,
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ompi_comm_reg_destructor );
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#ifdef MULTI_THREADS
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static ompi_mutex_t ompi_cid_lock;
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static volatile ompi_list_t registered_threads;
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static volatile int running_cid=-1;
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static ompi_list_t ompi_registered_comms;
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int ompi_comm_nextcid ( ompi_communicator_t* newcomm,
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@ -116,24 +133,23 @@ int ompi_comm_nextcid ( ompi_communicator_t* newcomm,
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}
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/* Lock the list
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register threads in registered_threads
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unlock
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*/
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OMPI_THREAD_LOCK(&ompi_cid_lock);
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ompi_comm_register_cid (comm->c_contextid);
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OMPI_THREAD_UNLOCK(&ompi_cid_lock);
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while (!done) {
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/* lock
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if (!lowest_cid ) {
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unlock;
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/**
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* This is the real algorithm described in the doc
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*/
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OMPI_THREAD_LOCK(&ompi_cid_lock);
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if (comm->c_contextid != ompi_comm_lowest_cid() ) {
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/* if not lowest cid, we do not continue, but sleep and try again */
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OMPI_THREAD_UNLOCK(&ompi_cid_lock);
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continue;
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}
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OMPI_THREAD_UNLOCK(&ompi_cid_lock);
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unlock;
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*/
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/**
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* This is the real algorithm described in the doc
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*/
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for (i=start; i<OMPI_MAX_COMM ;i++) {
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flag=ompi_pointer_array_test_and_set_item(&ompi_mpi_communicators, i, comm);
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@ -183,112 +199,80 @@ int ompi_comm_nextcid ( ompi_communicator_t* newcomm,
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newcomm->c_f_to_c_index = newcomm->c_contextid;
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ompi_pointer_array_set_item (&ompi_mpi_communicators, nextcid, newcomm);
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/*
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lock
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unregister
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unlock
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*/
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OMPI_THREAD_LOCK(&ompi_cid_lock);
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ompi_comm_unregister_cid (comm->c_contextid);
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OMPI_THREAD_UNLOCK(&ompi_cid_lock);
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return (MPI_SUCCESS);
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}
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#endif
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int ompi_comm_nextcid ( ompi_communicator_t* newcomm,
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ompi_communicator_t* comm,
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ompi_communicator_t* bridgecomm,
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void* local_leader,
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void* remote_leader,
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int mode, int send_first )
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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static void ompi_comm_reg_constructor (ompi_comm_reg_t *regcom)
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{
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int nextlocal_cid;
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int nextcid;
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int done=0;
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int response=0, glresponse=0;
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int flag;
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int start=ompi_mpi_communicators.lowest_free;
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int i;
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ompi_comm_cid_allredfct* allredfnct;
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/**
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* Determine which implementation of allreduce we have to use
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* for the current scenario
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*/
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switch (mode)
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{
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case OMPI_COMM_CID_INTRA:
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allredfnct=(ompi_comm_cid_allredfct*)ompi_comm_allreduce_intra;
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break;
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case OMPI_COMM_CID_INTER:
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allredfnct=(ompi_comm_cid_allredfct*)ompi_comm_allreduce_inter;
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break;
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case OMPI_COMM_CID_INTRA_BRIDGE:
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allredfnct=(ompi_comm_cid_allredfct*)ompi_comm_allreduce_intra_bridge;
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break;
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case OMPI_COMM_CID_INTRA_OOB:
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allredfnct=(ompi_comm_cid_allredfct*)ompi_comm_allreduce_intra_oob;
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break;
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default:
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return MPI_UNDEFINED;
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break;
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}
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/**
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* This is the real algorithm described in the doc
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*/
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while ( !done ){
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for (i=start; i<OMPI_MAX_COMM ;i++) {
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flag=ompi_pointer_array_test_and_set_item(&ompi_mpi_communicators, i, comm);
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if (true == flag) {
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nextlocal_cid = i;
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break;
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}
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}
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(allredfnct)(&nextlocal_cid, &nextcid, 1, MPI_MAX, comm, bridgecomm,
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local_leader, remote_leader, send_first );
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if (nextcid == nextlocal_cid) {
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response = 1; /* fine with me */
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}
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else {
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ompi_pointer_array_set_item(&ompi_mpi_communicators,
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nextlocal_cid, NULL);
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flag = ompi_pointer_array_test_and_set_item(&ompi_mpi_communicators,
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nextcid, comm );
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if (true == flag) {
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response = 1; /* works as well */
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}
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else {
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response = 0; /* nope, not acceptable */
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}
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}
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(allredfnct)(&response, &glresponse, 1, MPI_MIN, comm, bridgecomm,
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local_leader, remote_leader, send_first );
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if (1 == glresponse) {
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done = 1; /* we are done */
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break;
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}
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else if ( 0 == glresponse ) {
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if ( 1 == response ) {
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/* we could use that, but other don't agree */
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ompi_pointer_array_set_item(&ompi_mpi_communicators,
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nextcid, NULL);
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}
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start = nextcid+1; /* that's where we can start the next round */
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}
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}
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/* set the according values to the newcomm */
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newcomm->c_contextid = nextcid;
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newcomm->c_f_to_c_index = newcomm->c_contextid;
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ompi_pointer_array_set_item (&ompi_mpi_communicators, nextcid, newcomm);
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return (MPI_SUCCESS);
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regcom->cid=MPI_UNDEFINED;
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}
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static void ompi_comm_reg_destructor (ompi_comm_reg_t *regcom)
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{
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}
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void ompi_comm_reg_init (void)
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{
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OBJ_CONSTRUCT(&ompi_registered_comms, ompi_list_t);
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}
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void ompi_comm_reg_finalize (void)
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{
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OBJ_DESTRUCT(&ompi_registered_comms);
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}
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static int ompi_comm_register_cid (uint32_t cid )
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{
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ompi_list_item_t *item=NULL;
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ompi_comm_reg_t *regcom=NULL;
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ompi_comm_reg_t *newentry = OBJ_NEW(ompi_comm_reg_t);
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newentry->cid = cid;
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if ( !(ompi_list_is_empty (&ompi_registered_comms)) ) {
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for (item = ompi_list_get_first(&ompi_registered_comms);
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item != ompi_list_get_end(&ompi_registered_comms);
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item = ompi_list_get_next(item)) {
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regcom = (ompi_comm_reg_t *)item;
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if ( regcom->cid > cid ) {
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break;
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}
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}
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ompi_list_insert_pos (&ompi_registered_comms, (ompi_list_item_t *)regcom,
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(ompi_list_item_t *)newentry);
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}
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else {
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ompi_list_append (&ompi_registered_comms, (ompi_list_item_t *)newentry);
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}
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return OMPI_SUCCESS;
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}
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static int ompi_comm_unregister_cid (uint32_t cid)
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{
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ompi_comm_reg_t *regcom=NULL;
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ompi_list_item_t *item=ompi_list_remove_first(&ompi_registered_comms);
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regcom = (ompi_comm_reg_t *) item;
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OBJ_RELEASE(regcom);
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return OMPI_SUCCESS;
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}
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static uint32_t ompi_comm_lowest_cid (void)
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{
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ompi_comm_reg_t *regcom=NULL;
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ompi_list_item_t *item=ompi_list_get_first (&ompi_registered_comms);
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regcom = (ompi_comm_reg_t *)item;
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return regcom->cid;
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}
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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@ -127,6 +127,10 @@ int ompi_comm_init(void)
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OBJ_RETAIN(&ompi_mpi_group_null);
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OBJ_RETAIN(&ompi_mpi_errors_are_fatal);
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/* initialize the comm_reg stuff for multi-threaded comm_cid
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allocation */
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ompi_comm_reg_init();
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return OMPI_SUCCESS;
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}
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@ -208,6 +212,9 @@ int ompi_comm_finalize(void)
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OBJ_DESTRUCT (&ompi_mpi_communicators);
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/* finalize the comm_reg stuff */
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ompi_comm_reg_finalize();
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return OMPI_SUCCESS;
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}
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@ -382,6 +382,15 @@ extern "C" {
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/*
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* these are the init and finalize functions for the comm_reg
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* stuff. These routines are necessary for handling multi-threading
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* scenarious in the communicator_cid allocation
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*/
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void ompi_comm_reg_init(void);
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void ompi_comm_reg_finalize(void);
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#if defined(c_plusplus) || defined(__cplusplus)
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}
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#endif
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