static int runner(int argc, char *argv[])
{
/* Retrieve the list of all hosts as an array of hosts */
int hosts_count = MSG_get_host_number();
msg_host_t *hosts = xbt_dynar_to_array(MSG_hosts_as_dynar());
XBT_INFO("First, build a classical parallel task, with 1 Gflop to execute on each node, "
"and 10MB to exchange between each pair");
double *computation_amounts = xbt_new0(double, hosts_count);
double *communication_amounts = xbt_new0(double, hosts_count * hosts_count);
for (int i = 0; i < hosts_count; i++)
computation_amounts[i] = 1e9; // 1 Gflop
for (int i = 0; i < hosts_count; i++)
for (int j = i + 1; j < hosts_count; j++)
communication_amounts[i * hosts_count + j] = 1e7; // 10 MB
msg_task_t ptask =
MSG_parallel_task_create("parallel task", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
MSG_parallel_task_execute(ptask);
MSG_task_destroy(ptask);
/* The arrays communication_amounts and computation_amounts are not to be freed manually */
XBT_INFO("Then, build a parallel task involving only computations and no communication (1 Gflop per node)");
computation_amounts = xbt_new0(double, hosts_count);
for (int i = 0; i < hosts_count; i++)
computation_amounts[i] = 1e9; // 1 Gflop
ptask = MSG_parallel_task_create("parallel exec", hosts_count, hosts, computation_amounts, NULL/* no comm */, NULL);
MSG_parallel_task_execute(ptask);
MSG_task_destroy(ptask);
XBT_INFO("Then, build a parallel task with no computation nor communication (synchro only)");
computation_amounts = xbt_new0(double, hosts_count);
communication_amounts = xbt_new0(double, hosts_count * hosts_count); /* memset to 0 by xbt_new0 */
ptask = MSG_parallel_task_create("parallel sync", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
MSG_parallel_task_execute(ptask);
MSG_task_destroy(ptask);
XBT_INFO("Finally, trick the ptask to do a 'remote execution', on host %s", MSG_host_get_name(hosts[1]));
computation_amounts = xbt_new0(double, 1);
computation_amounts[0] = 1e9; // 1 Gflop
msg_host_t *remote = xbt_new(msg_host_t,1);
remote[0] = hosts[1];
ptask = MSG_parallel_task_create("remote exec", 1, remote, computation_amounts, NULL/* no comm */, NULL);
MSG_parallel_task_execute(ptask);
MSG_task_destroy(ptask);
free(remote);
XBT_INFO("Goodbye now!");
free(hosts);
return 0;
}
static int par_task(int /*argc*/, char* /*argv*/ [])
{
double * computation_amount = new double[2] {10E7, 10E7};
double * communication_amount = new double[4] {1E6, 1E6, 1E6, 1E6};
double progress;
std::vector<msg_host_t> hosts_to_use = std::vector<msg_host_t>();
hosts_to_use.push_back(MSG_get_host_by_name("Tremblay"));
hosts_to_use.push_back(MSG_get_host_by_name("Jupiter"));
msg_task_t task = MSG_parallel_task_create("ptask", 2, hosts_to_use.data(), computation_amount, communication_amount, NULL);
tasks.push_back(task);
XBT_INFO("get the progress of %s before the task starts", task->name);
progress = MSG_task_get_remaining_work_ratio(task);
xbt_assert(progress == 1.0, "Progress should be 1.0 not %f", progress);
XBT_INFO("Executing task: \"%s\"", task->name);
MSG_parallel_task_execute(task);
XBT_INFO("get the progress of %s after the task finishes", task->name);
progress = MSG_task_get_remaining_work_ratio(task);
xbt_assert(progress == 0.0, "Progress should be equal to 0.0 not %f", progress);
MSG_task_destroy(task);
delete[] computation_amount;
delete[] communication_amount;
XBT_INFO("Goodbye now!");
return 0;
}
int execute(int argc, char *argv[])
{
char buffer[32];
int i, j;
msg_host_t *m_host_list = NULL;
msg_task_t task = NULL;
int host_list_size;
double *computation_duration = NULL;
double *communication_table = NULL;
double communication_amount = 0;
double computation_amount = 0;
double execution_time;
host_list_size = argc - 3;
XBT_DEBUG("host_list_size=%d", host_list_size);
m_host_list = calloc(host_list_size, sizeof(msg_host_t));
for (i = 1; i <= host_list_size; i++) {
m_host_list[i - 1] = MSG_get_host_by_name(argv[i]);
xbt_assert(m_host_list[i - 1] != NULL,
"Unknown host %s. Stopping Now! ", argv[i]);
}
_XBT_GNUC_UNUSED int read;
read = sscanf(argv[argc - 2], "%lg", &computation_amount);
xbt_assert(read, "Invalid argument %s\n", argv[argc - 2]);
read = sscanf(argv[argc - 1], "%lg", &communication_amount);
xbt_assert(read, "Invalid argument %s\n", argv[argc - 1]);
computation_duration = (double *) calloc(host_list_size, sizeof(double));
communication_table =
(double *) calloc(host_list_size * host_list_size, sizeof(double));
for (i = 0; i < host_list_size; i++) {
computation_duration[i] = computation_amount / host_list_size;
for (j = 0; j < host_list_size; j++)
communication_table[i * host_list_size + j] =
communication_amount / (host_list_size * host_list_size);
}
sprintf(buffer, "redist#0\n");
task = MSG_parallel_task_create(buffer,
host_list_size,
m_host_list,
computation_duration,
communication_table, NULL);
execution_time = MSG_get_clock();
MSG_parallel_task_execute(task);
MSG_task_destroy(task);
xbt_free(m_host_list);
execution_time = MSG_get_clock() - execution_time;
XBT_INFO("execution_time=%g ", execution_time);
return 0;
}
/** \ingroup msg_file_management
* \brief Write into a file (local or remote)
*
* \param size of the file to write
* \param fd is a the file descriptor
* \return the number of bytes successfully write or -1 if an error occurred
*/
sg_size_t MSG_file_write(msg_file_t fd, sg_size_t size)
{
msg_file_priv_t file_priv = MSG_file_priv(fd);
sg_size_t write_size, offset;
/* Find the host where the file is physically located (remote or local)*/
msg_storage_t storage_src =(msg_storage_t) xbt_lib_get_elm_or_null(storage_lib, file_priv->storageId);
msg_storage_priv_t storage_priv_src = MSG_storage_priv(storage_src);
msg_host_t attached_host = MSG_get_host_by_name(storage_priv_src->hostname);
if(strcmp(storage_priv_src->hostname, MSG_host_get_name(MSG_host_self()))){
/* the file is hosted on a remote host, initiate a communication between src and dest hosts for data transfer */
XBT_DEBUG("File is on %s remote host, initiate data transfer of %llu bytes.", storage_priv_src->hostname, size);
msg_host_t *m_host_list = NULL;
m_host_list = calloc(2, sizeof(msg_host_t));
m_host_list[0] = MSG_host_self();
m_host_list[1] = attached_host;
double flops_amount[] = { 0, 0 };
double bytes_amount[] = { 0, (double)size, 0, 0 };
msg_task_t task = MSG_parallel_task_create("file transfer for write", 2, m_host_list, flops_amount, bytes_amount, NULL);
msg_error_t transfer = MSG_parallel_task_execute(task);
MSG_task_destroy(task);
free(m_host_list);
if(transfer != MSG_OK){
if (transfer == MSG_HOST_FAILURE)
XBT_WARN("Transfer error, %s remote host just turned off!", MSG_host_get_name(attached_host));
if (transfer == MSG_TASK_CANCELED)
XBT_WARN("Transfer error, task has been canceled!");
return -1;
}
}
/* Write file on local or remote host */
offset = simcall_file_tell(file_priv->simdata->smx_file);
write_size = simcall_file_write(file_priv->simdata->smx_file, size, attached_host);
file_priv->size = offset+write_size;
return write_size;
}
/** Emitter function */
int test(int argc, char *argv[])
{
xbt_dynar_t slaves_dynar;
int slaves_count = 0;
msg_host_t *slaves = NULL;
double task_comp_size = 100000;
double task_comm_size = 10000;
double *computation_amount = NULL;
double *communication_amount = NULL;
msg_task_t ptask = NULL;
int i, j;
slaves_dynar = MSG_hosts_as_dynar();
slaves_count = xbt_dynar_length(slaves_dynar);
slaves = xbt_dynar_to_array(slaves_dynar);
computation_amount = xbt_new0(double, slaves_count);
communication_amount = xbt_new0(double, slaves_count * slaves_count);
for (i = 0; i < slaves_count; i++)
computation_amount[i] = task_comp_size;
for (i = 0; i < slaves_count; i++)
for (j = i + 1; j < slaves_count; j++)
communication_amount[i * slaves_count + j] = task_comm_size;
ptask = MSG_parallel_task_create("parallel task",
slaves_count, slaves,
computation_amount,
communication_amount, NULL);
MSG_parallel_task_execute(ptask);
MSG_task_destroy(ptask);
/* There is no need to free that! */
/* free(communication_amount); */
/* free(computation_amount); */
XBT_INFO("Goodbye now!");
free(slaves);
return 0;
}
static void simulate_shutdown(msg_host_t host) {
int previous_pstate = MSG_host_get_pstate(host);
XBT_INFO("Switch to virtual pstate 4, that encodes the shutting down state in the XML file of that example");
MSG_host_set_pstate(host,4);
msg_host_t host_list[1] = {host};
double flops_amount[1] = {1};
double bytes_amount[1] = {0};
XBT_INFO("Simulate the shutdown by executing one flop on that remote host (using a parallel task)");
msg_task_t shutdown = MSG_parallel_task_create("shutdown", 1, host_list, flops_amount, bytes_amount, NULL);
MSG_task_execute(shutdown);
MSG_task_destroy(shutdown);
XBT_INFO("Switch back to previously selected pstate %d", previous_pstate);
MSG_host_set_pstate(host, previous_pstate);
XBT_INFO("Actually shutdown the host");
MSG_host_off(host);
}
static void simulate_bootup(msg_host_t host) {
int previous_pstate = MSG_host_get_pstate(host);
XBT_INFO("Switch to virtual pstate 3, that encodes the shutting down state in the XML file of that example");
MSG_host_set_pstate(host,3);
msg_host_t host_list[1] = {host};
double flops_amount[1] = {1};
double bytes_amount[1] = {0};
XBT_INFO("Actually start the host");
MSG_host_on(host);
XBT_INFO("Simulate the boot up by executing one flop on that host");
// We use a parallel task to run some task on a remote host.
msg_task_t bootup = MSG_parallel_task_create("boot up", 1, host_list, flops_amount, bytes_amount, NULL);
MSG_task_execute(bootup);
MSG_task_destroy(bootup);
XBT_INFO("Switch back to previously selected pstate %d", previous_pstate);
MSG_host_set_pstate(host, previous_pstate);
}