--- /dev/null
+/* Copyright (c) 2013-2014. The SimGrid Team.
+ * All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "../colls_private.h"
+
+static int bcast_NTSL_segment_size_in_byte = 8192;
+
+#define HEADER_SIZE 1024
+#define MAX_NODE 1024
+
+/* Non-topology-specific pipelined linear-bcast function */
+int smpi_coll_tuned_bcast_arrival_pattern_aware(void *buf, int count,
+ MPI_Datatype datatype, int root,
+ MPI_Comm comm)
+{
+ int tag = -COLL_TAG_BCAST;
+ MPI_Status status;
+ MPI_Request request;
+ MPI_Request *send_request_array;
+ MPI_Request *recv_request_array;
+ MPI_Status *send_status_array;
+ MPI_Status *recv_status_array;
+
+ MPI_Status temp_status_array[MAX_NODE];
+
+ int rank, size;
+ int i, j;
+
+ int sent_count;
+ int header_index;
+ int flag_array[MAX_NODE];
+ int already_sent[MAX_NODE];
+ int to_clean[MAX_NODE];
+ int header_buf[HEADER_SIZE];
+ char temp_buf[MAX_NODE];
+
+ MPI_Aint extent;
+ extent = datatype->get_extent();
+
+ /* destination */
+ int to;
+
+
+
+ rank = comm->rank();
+ size = comm->size();
+
+
+ /* segment is segment size in number of elements (not bytes) */
+ int segment = bcast_NTSL_segment_size_in_byte / extent;
+ segment = segment == 0 ? 1 :segment;
+ /* pipeline length */
+ int pipe_length = count / segment;
+
+ /* use for buffer offset for sending and receiving data = segment size in byte */
+ int increment = segment * extent;
+
+ /* if the input size is not divisible by segment size =>
+ the small remainder will be done with native implementation */
+ int remainder = count % segment;
+
+ /* if root is not zero send to rank zero first
+ this can be modified to make it faster by using logical src, dst.
+ */
+ if (root != 0) {
+ if (rank == root) {
+ Request::send(buf, count, datatype, 0, tag, comm);
+ } else if (rank == 0) {
+ Request::recv(buf, count, datatype, root, tag, comm, &status);
+ }
+ }
+
+ /* value == 0 means root has not send data (or header) to the node yet */
+ for (i = 0; i < MAX_NODE; i++) {
+ already_sent[i] = 0;
+ to_clean[i] = 0;
+ }
+
+ /* when a message is smaller than a block size => no pipeline */
+ if (count <= segment) {
+ if (rank == 0) {
+ sent_count = 0;
+
+ while (sent_count < (size - 1)) {
+ for (i = 1; i < size; i++) {
+ Request::iprobe(i, MPI_ANY_TAG, comm, &flag_array[i],
+ MPI_STATUSES_IGNORE);
+ }
+
+ header_index = 0;
+ /* recv 1-byte message */
+ for (i = 1; i < size; i++) {
+
+ /* message arrive */
+ if ((flag_array[i] == 1) && (already_sent[i] == 0)) {
+ Request::recv(temp_buf, 1, MPI_CHAR, i, tag, comm, &status);
+ header_buf[header_index] = i;
+ header_index++;
+ sent_count++;
+
+ /* will send in the next step */
+ already_sent[i] = 1;
+ }
+ }
+
+ /* send header followed by data */
+ if (header_index != 0) {
+ header_buf[header_index] = -1;
+ to = header_buf[0];
+ Request::send(header_buf, HEADER_SIZE, MPI_INT, to, tag, comm);
+ Request::send(buf, count, datatype, to, tag, comm);
+ }
+
+ /* randomly MPI_Send to one */
+ else {
+ /* search for the first node that never received data before */
+ for (i = 1; i < size; i++) {
+ if (already_sent[i] == 0) {
+ header_buf[0] = i;
+ header_buf[1] = -1;
+ Request::send(header_buf, HEADER_SIZE, MPI_INT, i, tag, comm);
+ Request::send(buf, count, datatype, i, tag, comm);
+ already_sent[i] = 1;
+ sent_count++;
+ break;
+ }
+ }
+ }
+
+
+ } /* while loop */
+ }
+
+ /* non-root */
+ else {
+
+ /* send 1-byte message to root */
+ Request::send(temp_buf, 1, MPI_CHAR, 0, tag, comm);
+
+ /* wait for header and data, forward when required */
+ Request::recv(header_buf, HEADER_SIZE, MPI_INT, MPI_ANY_SOURCE, tag, comm,
+ &status);
+ Request::recv(buf, count, datatype, MPI_ANY_SOURCE, tag, comm, &status);
+
+ /* search for where it is */
+ int myordering = 0;
+ while (rank != header_buf[myordering]) {
+ myordering++;
+ }
+
+ /* send header followed by data */
+ if (header_buf[myordering + 1] != -1) {
+ Request::send(header_buf, HEADER_SIZE, MPI_INT, header_buf[myordering + 1],
+ tag, comm);
+ Request::send(buf, count, datatype, header_buf[myordering + 1], tag, comm);
+ }
+ }
+ }
+ /* pipeline bcast */
+ else {
+ send_request_array =
+ (MPI_Request *) xbt_malloc((size + pipe_length) * sizeof(MPI_Request));
+ recv_request_array =
+ (MPI_Request *) xbt_malloc((size + pipe_length) * sizeof(MPI_Request));
+ send_status_array =
+ (MPI_Status *) xbt_malloc((size + pipe_length) * sizeof(MPI_Status));
+ recv_status_array =
+ (MPI_Status *) xbt_malloc((size + pipe_length) * sizeof(MPI_Status));
+
+ if (rank == 0) {
+ //double start2 = MPI_Wtime();
+ sent_count = 0;
+ //int iteration = 0;
+ while (sent_count < (size - 1)) {
+ //iteration++;
+ //start = MPI_Wtime();
+ for (i = 1; i < size; i++) {
+ Request::iprobe(i, MPI_ANY_TAG, comm, &flag_array[i],
+ &temp_status_array[i]);
+ }
+ //total = MPI_Wtime() - start;
+ //total *= 1000;
+ //printf("Iprobe time = %.2f\n",total);
+ header_index = 0;
+
+ MPI_Wtime();
+ /* recv 1-byte message */
+ for (i = 1; i < size; i++) {
+ /* message arrive */
+ if ((flag_array[i] == 1) && (already_sent[i] == 0)) {
+ Request::recv(&temp_buf[i], 1, MPI_CHAR, i, tag, comm,
+ &status);
+ header_buf[header_index] = i;
+ header_index++;
+ sent_count++;
+
+ /* will send in the next step */
+ already_sent[i] = 1;
+ }
+ }
+ //total = MPI_Wtime() - start;
+ //total *= 1000;
+ //printf("Recv 1-byte time = %.2f\n",total);
+
+ /*
+ if (header_index != 0) {
+ printf("header index = %d node = ",header_index);
+ for (i=0;i<header_index;i++) {
+ printf("%d ",header_buf[i]);
+ }
+ printf("\n");
+ }
+ */
+
+ /* send header followed by data */
+ if (header_index != 0) {
+ header_buf[header_index] = -1;
+ to = header_buf[0];
+
+ //start = MPI_Wtime();
+
+ /* send header */
+ Request::send(header_buf, HEADER_SIZE, MPI_INT, to, tag, comm);
+
+ //total = MPI_Wtime() - start;
+ //total *= 1000;
+ //printf("\tSend header to %d time = %.2f\n",to,total);
+
+ //start = MPI_Wtime();
+
+ /* send data - non-pipeline case */
+
+ if (0 == 1) {
+ //if (header_index == 1) {
+ Request::send(buf, count, datatype, to, tag, comm);
+ }
+
+
+ /* send data - pipeline */
+ else {
+ for (i = 0; i < pipe_length; i++) {
+ Request::send((char *)buf + (i * increment), segment, datatype, to, tag, comm);
+ }
+ //Request::waitall((pipe_length), send_request_array, send_status_array);
+ }
+ //total = MPI_Wtime() - start;
+ //total *= 1000;
+ //printf("\tSend data to %d time = %.2f\n",to,total);
+
+ }
+
+
+
+ /* randomly MPI_Send to one node */
+ else {
+ /* search for the first node that never received data before */
+ for (i = 1; i < size; i++) {
+ if (already_sent[i] == 0) {
+ header_buf[0] = i;
+ header_buf[1] = -1;
+ to = i;
+
+ //start = MPI_Wtime();
+ Request::send(header_buf, HEADER_SIZE, MPI_INT, to, tag, comm);
+
+ /* still need to chop data so that we can use the same non-root code */
+ for (j = 0; j < pipe_length; j++) {
+ Request::send((char *)buf + (j * increment), segment, datatype, to, tag,
+ comm);
+ }
+
+ //Request::send(buf,count,datatype,to,tag,comm);
+ //Request::wait(&request,MPI_STATUS_IGNORE);
+
+ //total = MPI_Wtime() - start;
+ //total *= 1000;
+ //printf("SEND TO SINGLE node %d time = %.2f\n",i,total);
+
+
+ already_sent[i] = 1;
+ to_clean[i]=1;
+ sent_count++;
+ break;
+ }
+ }
+ }
+
+ } /* while loop */
+
+ for(i=0; i<size; i++)
+ if(to_clean[i]!=0)Request::recv(&temp_buf[i], 1, MPI_CHAR, i, tag, comm,
+ &status);
+ //total = MPI_Wtime() - start2;
+ //total *= 1000;
+ //printf("Node zero iter = %d time = %.2f\n",iteration,total);
+ }
+
+ /* rank 0 */
+ /* none root */
+ else {
+ /* send 1-byte message to root */
+ Request::send(temp_buf, 1, MPI_CHAR, 0, tag, comm);
+
+ /* wait for header forward when required */
+ request = Request::irecv(header_buf, HEADER_SIZE, MPI_INT, MPI_ANY_SOURCE, tag, comm);
+ Request::wait(&request, MPI_STATUS_IGNORE);
+
+ /* search for where it is */
+ int myordering = 0;
+ while (rank != header_buf[myordering]) {
+ myordering++;
+ }
+
+ /* send header when required */
+ if (header_buf[myordering + 1] != -1) {
+ Request::send(header_buf, HEADER_SIZE, MPI_INT, header_buf[myordering + 1],
+ tag, comm);
+ }
+
+ /* receive data */
+
+ if (0 == -1) {
+ //if (header_buf[1] == -1) {
+ request = Request::irecv(buf, count, datatype, 0, tag, comm);
+ Request::wait(&request, MPI_STATUS_IGNORE);
+ //printf("\t\tnode %d ordering = %d receive data from root\n",rank,myordering);
+ } else {
+ for (i = 0; i < pipe_length; i++) {
+ recv_request_array[i] = Request::irecv((char *)buf + (i * increment), segment, datatype, MPI_ANY_SOURCE,
+ tag, comm);
+ }
+ }
+
+ /* send data */
+ if (header_buf[myordering + 1] != -1) {
+ for (i = 0; i < pipe_length; i++) {
+ Request::wait(&recv_request_array[i], MPI_STATUS_IGNORE);
+ send_request_array[i] = Request::isend((char *)buf + (i * increment), segment, datatype,
+ header_buf[myordering + 1], tag, comm);
+ }
+ Request::waitall((pipe_length), send_request_array, send_status_array);
+ }else{
+ Request::waitall(pipe_length, recv_request_array, recv_status_array);
+ }
+
+ }
+
+ free(send_request_array);
+ free(recv_request_array);
+ free(send_status_array);
+ free(recv_status_array);
+ } /* end pipeline */
+
+ /* when count is not divisible by block size, use default BCAST for the remainder */
+ if ((remainder != 0) && (count > segment)) {
+ XBT_WARN("MPI_bcast_arrival_pattern_aware use default MPI_bcast.");
+ smpi_mpi_bcast((char *)buf + (pipe_length * increment), remainder, datatype, root, comm);
+ }
+
+ return MPI_SUCCESS;
+}
