Adding segmented ring algorithm for Allreduce for commutative operations.
Algorithm allows user to specify the segment size to be used for computation/communication overlap. The additional memory requirement for the algorithm is 2 x segment size. It performed well for (really) large message sizes over MX and it passed intel Allreduce_c and Allreduce_loc_c tests. This commit was SVN r13832.
Этот коммит содержится в:
Jelena Pjesivac-Grbovic
родитель
8287167635
Коммит
627533fe4a
@ -136,6 +136,7 @@ extern int ompi_coll_tuned_forced_max_algorithms[COLLCOUNT];
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int ompi_coll_tuned_allreduce_intra_nonoverlapping(ALLREDUCE_ARGS);
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int ompi_coll_tuned_allreduce_intra_recursivedoubling(ALLREDUCE_ARGS);
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int ompi_coll_tuned_allreduce_intra_ring(ALLREDUCE_ARGS);
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int ompi_coll_tuned_allreduce_intra_ring_segmented(ALLREDUCE_ARGS, uint32_t segsize);
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int ompi_coll_tuned_allreduce_intra_basic_linear(ALLREDUCE_ARGS);
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int ompi_coll_tuned_allreduce_inter_dec_fixed(ALLREDUCE_ARGS);
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int ompi_coll_tuned_allreduce_inter_dec_dynamic(ALLREDUCE_ARGS);
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@ -529,6 +529,328 @@ ompi_coll_tuned_allreduce_intra_ring(void *sbuf, void *rbuf, int count,
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return ret;
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}
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/*
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* ompi_coll_tuned_allreduce_intra_ring_segmented
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*
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* Function: Pipelined ring algorithm for allreduce operation
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* Accepts: Same as MPI_Allreduce(), segment size
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* Returns: MPI_SUCCESS or error code
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*
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* Description: Implements pipelined ring algorithm for allreduce:
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* user supplies suggested segment size for the pipelining of
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* reduce operation.
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* The segment size determines the number of phases, np, for
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* the algorithm execution.
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* The message is automatically divided into blocks of
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* approximately (count / (np * segcount)) elements.
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* At the end of reduction phase, allgather like step is
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* executed.
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* Algorithm requires (np + 1)*(N - 1) steps.
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*
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* Limitations: The algorithm DOES NOT preserve order of operations so it
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* can be used only for commutative operations.
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* In addition, algorithm cannot work if the total size is
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* less than size * segment size.
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* Example on 3 nodes with 2 phases
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* Initial state
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* # 0 1 2
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* [00a] [10a] [20a]
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* [00b] [10b] [20b]
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* [01a] [11a] [21a]
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* [01b] [11b] [21b]
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* [02a] [12a] [22a]
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* [02b] [12b] [22b]
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*
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* COMPUTATION PHASE 0 (a)
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* Step 0: rank r sends block ra to rank (r+1) and receives bloc (r-1)a
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* from rank (r-1) [with wraparound].
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* # 0 1 2
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* [00a] [00a+10a] [20a]
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* [00b] [10b] [20b]
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* [01a] [11a] [11a+21a]
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* [01b] [11b] [21b]
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* [22a+02a] [12a] [22a]
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* [02b] [12b] [22b]
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*
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* Step 1: rank r sends block (r-1)a to rank (r+1) and receives bloc
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* (r-2)a from rank (r-1) [with wraparound].
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* # 0 1 2
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* [00a] [00a+10a] [00a+10a+20a]
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* [00b] [10b] [20b]
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* [11a+21a+01a] [11a] [11a+21a]
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* [01b] [11b] [21b]
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* [22a+02a] [22a+02a+12a] [22a]
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* [02b] [12b] [22b]
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*
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* COMPUTATION PHASE 1 (b)
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* Step 0: rank r sends block rb to rank (r+1) and receives bloc (r-1)b
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* from rank (r-1) [with wraparound].
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* # 0 1 2
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* [00a] [00a+10a] [20a]
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* [00b] [00b+10b] [20b]
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* [01a] [11a] [11a+21a]
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* [01b] [11b] [11b+21b]
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* [22a+02a] [12a] [22a]
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* [22b+02b] [12b] [22b]
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*
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* Step 1: rank r sends block (r-1)b to rank (r+1) and receives bloc
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* (r-2)b from rank (r-1) [with wraparound].
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* # 0 1 2
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* [00a] [00a+10a] [00a+10a+20a]
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* [00b] [10b] [0bb+10b+20b]
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* [11a+21a+01a] [11a] [11a+21a]
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* [11b+21b+01b] [11b] [21b]
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* [22a+02a] [22a+02a+12a] [22a]
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* [02b] [22b+01b+12b] [22b]
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*
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*
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* DISTRIBUTION PHASE: ring ALLGATHER with ranks shifted by 1 (same as
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* in regular ring algorithm.
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*
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*/
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int
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ompi_coll_tuned_allreduce_intra_ring_segmented(void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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struct ompi_communicator_t *comm,
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uint32_t segsize)
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{
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int ret, line;
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int rank, size, k, recv_from, send_to;
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int early_blockcount, late_blockcount, split_rank;
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int segcount, max_segcount;
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int num_phases, phase;
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int block_count, inbi;
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size_t typelng;
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char *tmpsend = NULL, *tmprecv = NULL;
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char *inbuf[2] = {NULL, NULL};
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ptrdiff_t true_lb, true_extent, lb, extent;
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ptrdiff_t block_offset, max_real_segsize;
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ompi_request_t *reqs[2] = {NULL, NULL};
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size = ompi_comm_size(comm);
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rank = ompi_comm_rank(comm);
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OPAL_OUTPUT((ompi_coll_tuned_stream,
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"coll:tuned:allreduce_intra_ring_segmented rank %d, count %d", rank, count));
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/* Special case for size == 1 */
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if (1 == size) {
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if (MPI_IN_PLACE != sbuf) {
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ret = ompi_ddt_copy_content_same_ddt(dtype, count, (char*)rbuf, (char*)sbuf);
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if (ret < 0) { line = __LINE__; goto error_hndl; }
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}
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return MPI_SUCCESS;
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}
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/* Determine segment count based on the suggested segment size */
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ret = ompi_ddt_get_extent(dtype, &lb, &extent);
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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ret = ompi_ddt_get_true_extent(dtype, &true_lb, &true_extent);
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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ret = ompi_ddt_type_size( dtype, &typelng);
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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segcount = count;
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COLL_TUNED_COMPUTED_SEGCOUNT(segsize, typelng, segcount)
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/* Special case for count less than size * segcount - use regular ring */
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if (count < size * segcount) {
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OPAL_OUTPUT((ompi_coll_tuned_stream, "coll:tuned:allreduce_ring_segmented rank %d/%d, count %d, switching to regular ring", rank, size, count));
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return (ompi_coll_tuned_allreduce_intra_ring(sbuf, rbuf, count, dtype, op,
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comm));
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}
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/* Determine the number of phases of the algorithm */
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num_phases = count / (size * segcount);
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if ((count % (size * segcount) >= size) &&
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(count % (size * segcount) > ((size * segcount) / 2))) {
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num_phases++;
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}
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/* Determine the number of elements per block and corresponding
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block sizes.
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The blocks are divided into "early" and "late" ones:
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blocks 0 .. (split_rank - 1) are "early" and
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blocks (split_rank) .. (size - 1) are "late".
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Early blocks are at most 1 element larger than the late ones.
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Note, these blocks will be split into num_phases segments,
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out of the largest one will have max_segcount elements.
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*/
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COLL_TUNED_COMPUTE_BLOCKCOUNT( count, size, split_rank,
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early_blockcount, late_blockcount )
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COLL_TUNED_COMPUTE_BLOCKCOUNT( early_blockcount, num_phases, inbi,
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max_segcount, k)
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max_real_segsize = true_extent + (max_segcount - 1) * extent;
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/* Allocate and initialize temporary buffers */
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inbuf[0] = (char*)malloc(max_real_segsize);
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if (NULL == inbuf[0]) { ret = -1; line = __LINE__; goto error_hndl; }
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if (size > 2) {
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inbuf[1] = (char*)malloc(max_real_segsize);
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if (NULL == inbuf[1]) { ret = -1; line = __LINE__; goto error_hndl; }
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}
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/* Handle MPI_IN_PLACE */
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if (MPI_IN_PLACE != sbuf) {
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ret = ompi_ddt_copy_content_same_ddt(dtype, count, (char*)rbuf, (char*)sbuf);
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if (ret < 0) { line = __LINE__; goto error_hndl; }
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}
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/* Computation loop: for each phase, repeat ring allreduce computation loop */
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for (phase = 0; phase < num_phases; phase ++) {
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ptrdiff_t phase_offset;
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int early_phase_segcount, late_phase_segcount, split_phase, phase_count;
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/*
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For each of the remote nodes:
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- post irecv for block (r-1)
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- send block (r)
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To do this, first compute block offset and count, and use block offset
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to compute phase offset.
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- in loop for every step k = 2 .. n
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- post irecv for block (r + n - k) % n
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- wait on block (r + n - k + 1) % n to arrive
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- compute on block (r + n - k + 1) % n
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- send block (r + n - k + 1) % n
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- wait on block (r + 1)
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- compute on block (r + 1)
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- send block (r + 1) to rank (r + 1)
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Note that we must be careful when computing the begining of buffers and
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for send operations and computation we must compute the exact block size.
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*/
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send_to = (rank + 1) % size;
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recv_from = (rank + size - 1) % size;
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inbi = 0;
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/* Initialize first receive from the neighbor on the left */
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ret = MCA_PML_CALL(irecv(inbuf[inbi], max_segcount, dtype, recv_from,
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MCA_COLL_BASE_TAG_ALLREDUCE, comm, &reqs[inbi]));
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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/* Send first block (my block) to the neighbor on the right:
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- compute my block and phase offset
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- send data */
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block_offset = ((rank < split_rank)?
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(rank * early_blockcount) :
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(rank * late_blockcount + split_rank));
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block_count = ((rank < split_rank)? early_blockcount : late_blockcount);
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COLL_TUNED_COMPUTE_BLOCKCOUNT(block_count, num_phases, split_phase,
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early_phase_segcount, late_phase_segcount)
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phase_count = ((phase < split_phase)?
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(early_phase_segcount) : (late_phase_segcount));
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phase_offset = ((phase < split_phase)?
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(phase * early_phase_segcount) :
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(phase * late_phase_segcount + split_phase));
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tmpsend = ((char*)rbuf) + (block_offset + phase_offset) * extent;
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ret = MCA_PML_CALL(send(tmpsend, phase_count, dtype, send_to,
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MCA_COLL_BASE_TAG_ALLREDUCE,
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MCA_PML_BASE_SEND_STANDARD, comm));
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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for (k = 2; k < size; k++) {
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const int prevblock = (rank + size - k + 1) % size;
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inbi = inbi ^ 0x1;
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/* Post irecv for the current block */
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ret = MCA_PML_CALL(irecv(inbuf[inbi], max_segcount, dtype, recv_from,
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MCA_COLL_BASE_TAG_ALLREDUCE, comm,
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&reqs[inbi]));
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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/* Wait on previous block to arrive */
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ret = ompi_request_wait(&reqs[inbi ^ 0x1], MPI_STATUS_IGNORE);
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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/* Apply operation on previous block: result goes to rbuf
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rbuf[prevblock] = inbuf[inbi ^ 0x1] (op) rbuf[prevblock]
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*/
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block_offset = ((prevblock < split_rank)?
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(prevblock * early_blockcount) :
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(prevblock * late_blockcount + split_rank));
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block_count = ((prevblock < split_rank)?
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early_blockcount : late_blockcount);
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COLL_TUNED_COMPUTE_BLOCKCOUNT(block_count, num_phases, split_phase,
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early_phase_segcount, late_phase_segcount)
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phase_count = ((phase < split_phase)?
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(early_phase_segcount) : (late_phase_segcount));
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phase_offset = ((phase < split_phase)?
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(phase * early_phase_segcount) :
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(phase * late_phase_segcount + split_phase));
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tmprecv = ((char*)rbuf) + (block_offset + phase_offset) * extent;
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ompi_op_reduce(op, inbuf[inbi ^ 0x1], tmprecv, phase_count, dtype);
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/* send previous block to send_to */
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ret = MCA_PML_CALL(send(tmprecv, phase_count, dtype, send_to,
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MCA_COLL_BASE_TAG_ALLREDUCE,
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MCA_PML_BASE_SEND_STANDARD, comm));
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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}
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/* Wait on the last block to arrive */
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ret = ompi_request_wait(&reqs[inbi], MPI_STATUS_IGNORE);
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
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/* Apply operation on the last block (from neighbor (rank + 1)
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rbuf[rank+1] = inbuf[inbi] (op) rbuf[rank + 1] */
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recv_from = (rank + 1) % size;
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block_offset = ((recv_from < split_rank)?
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(recv_from * early_blockcount) :
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(recv_from * late_blockcount + split_rank));
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block_count = ((recv_from < split_rank)?
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early_blockcount : late_blockcount);
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COLL_TUNED_COMPUTE_BLOCKCOUNT(block_count, num_phases, split_phase,
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early_phase_segcount, late_phase_segcount)
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phase_count = ((phase < split_phase)?
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(early_phase_segcount) : (late_phase_segcount));
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phase_offset = ((phase < split_phase)?
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(phase * early_phase_segcount) :
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(phase * late_phase_segcount + split_phase));
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tmprecv = ((char*)rbuf) + (block_offset + phase_offset) * extent;
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ompi_op_reduce(op, inbuf[inbi], tmprecv, phase_count, dtype);
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}
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/* Distribution loop - variation of ring allgather */
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send_to = (rank + 1) % size;
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recv_from = (rank + size - 1) % size;
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for (k = 0; k < size - 1; k++) {
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const int recv_data_from = (rank + size - k) % size;
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const int send_data_from = (rank + 1 + size - k) % size;
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const int send_block_offset =
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((send_data_from < split_rank)?
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(send_data_from * early_blockcount) :
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(send_data_from * late_blockcount + split_rank));
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const int recv_block_offset =
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((recv_data_from < split_rank)?
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(recv_data_from * early_blockcount) :
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(recv_data_from * late_blockcount + split_rank));
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block_count = ((send_data_from < split_rank)?
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early_blockcount : late_blockcount);
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tmprecv = (char*)rbuf + recv_block_offset * extent;
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tmpsend = (char*)rbuf + send_block_offset * extent;
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ret = ompi_coll_tuned_sendrecv(tmpsend, block_count, dtype, send_to,
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MCA_COLL_BASE_TAG_ALLREDUCE,
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tmprecv, early_blockcount, dtype, recv_from,
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MCA_COLL_BASE_TAG_ALLREDUCE,
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comm, MPI_STATUS_IGNORE, rank);
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if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl;}
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}
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if (NULL != inbuf[0]) free(inbuf[0]);
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if (NULL != inbuf[1]) free(inbuf[1]);
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return MPI_SUCCESS;
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error_hndl:
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OPAL_OUTPUT((ompi_coll_tuned_stream, "%s:%4d\tRank %d Error occurred %d\n",
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__FILE__, line, rank, ret));
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if (NULL != inbuf[0]) free(inbuf[0]);
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if (NULL != inbuf[1]) free(inbuf[1]);
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return ret;
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}
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/*
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* Linear functions are copied from the BASIC coll module
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* they do not segment the message and are simple implementations
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@ -596,7 +918,7 @@ ompi_coll_tuned_allreduce_intra_basic_linear(void *sbuf, void *rbuf, int count,
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int ompi_coll_tuned_allreduce_intra_check_forced_init (coll_tuned_force_algorithm_mca_param_indices_t *mca_param_indices)
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{
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int rc, max_alg = 4, requested_alg;
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int rc, max_alg = 5, requested_alg;
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ompi_coll_tuned_forced_max_algorithms[ALLREDUCE] = max_alg;
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@ -608,7 +930,7 @@ int ompi_coll_tuned_allreduce_intra_check_forced_init (coll_tuned_force_algorith
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mca_param_indices->algorithm_param_index
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= mca_base_param_reg_int( &mca_coll_tuned_component.super.collm_version,
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"allreduce_algorithm",
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"Which allreduce algorithm is used. Can be locked down to any of: 0 ignore, 1 basic linear, 2 nonoverlapping (tuned reduce + tuned bcast), 3 recursive doubling, 4 ring",
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"Which allreduce algorithm is used. Can be locked down to any of: 0 ignore, 1 basic linear, 2 nonoverlapping (tuned reduce + tuned bcast), 3 recursive doubling, 4 ring, 5 segmented ring",
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false, false, 0, NULL);
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mca_base_param_lookup_int( mca_param_indices->algorithm_param_index, &(requested_alg));
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if( requested_alg > max_alg ) {
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@ -659,6 +981,7 @@ int ompi_coll_tuned_allreduce_intra_do_forced(void *sbuf, void *rbuf, int count,
|
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case (2): return ompi_coll_tuned_allreduce_intra_nonoverlapping (sbuf, rbuf, count, dtype, op, comm);
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case (3): return ompi_coll_tuned_allreduce_intra_recursivedoubling (sbuf, rbuf, count, dtype, op, comm);
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case (4): return ompi_coll_tuned_allreduce_intra_ring (sbuf, rbuf, count, dtype, op, comm);
|
||||
case (5): return ompi_coll_tuned_allreduce_intra_ring_segmented (sbuf, rbuf, count, dtype, op, comm, comm->c_coll_selected_data->user_forced[ALLREDUCE].segsize);
|
||||
default:
|
||||
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_forced attempt to select algorithm %d when only 0-%d is valid?",
|
||||
comm->c_coll_selected_data->user_forced[ALLREDUCE].algorithm,
|
||||
@ -684,6 +1007,7 @@ int ompi_coll_tuned_allreduce_intra_do_this(void *sbuf, void *rbuf, int count,
|
||||
case (2): return ompi_coll_tuned_allreduce_intra_nonoverlapping (sbuf, rbuf, count, dtype, op, comm);
|
||||
case (3): return ompi_coll_tuned_allreduce_intra_recursivedoubling (sbuf, rbuf, count, dtype, op, comm);
|
||||
case (4): return ompi_coll_tuned_allreduce_intra_ring (sbuf, rbuf, count, dtype, op, comm);
|
||||
case (5): return ompi_coll_tuned_allreduce_intra_ring_segmented (sbuf, rbuf, count, dtype, op, comm, segsize);
|
||||
default:
|
||||
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:allreduce_intra_do_this attempt to select algorithm %d when only 0-%d is valid?",
|
||||
algorithm, ompi_coll_tuned_forced_max_algorithms[ALLREDUCE]));
|
||||
|
||||
@ -43,6 +43,7 @@ ompi_coll_tuned_allreduce_intra_dec_fixed (void *sbuf, void *rbuf, int count,
|
||||
struct ompi_communicator_t *comm)
|
||||
{
|
||||
size_t dsize, block_dsize;
|
||||
int comm_size = ompi_comm_size(comm);
|
||||
const size_t intermediate_message = 10000;
|
||||
OPAL_OUTPUT((ompi_coll_tuned_stream, "ompi_coll_tuned_allreduce_intra_dec_fixed"));
|
||||
|
||||
@ -62,9 +63,17 @@ ompi_coll_tuned_allreduce_intra_dec_fixed (void *sbuf, void *rbuf, int count,
|
||||
op, comm));
|
||||
}
|
||||
|
||||
if( ompi_op_is_commute(op) ) {
|
||||
return (ompi_coll_tuned_allreduce_intra_ring (sbuf, rbuf, count, dtype,
|
||||
op, comm));
|
||||
if( ompi_op_is_commute(op) && (count > comm_size) ) {
|
||||
const size_t segment_size = 1 << 20; /* 1 MB */
|
||||
if ((comm_size * segment_size >= block_dsize)) {
|
||||
return (ompi_coll_tuned_allreduce_intra_ring (sbuf, rbuf, count, dtype,
|
||||
op, comm));
|
||||
} else {
|
||||
return (ompi_coll_tuned_allreduce_intra_ring_segmented (sbuf, rbuf,
|
||||
count, dtype,
|
||||
op, comm,
|
||||
segment_size));
|
||||
}
|
||||
}
|
||||
|
||||
return (ompi_coll_tuned_allreduce_intra_nonoverlapping (sbuf, rbuf, count,
|
||||
|
||||
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