+/* Copyright (c) 2007, 2009, 2010. 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 <math.h> // sqrt
#include "private.h"
+#include "xbt/dict.h"
+#include "xbt/sysdep.h"
+#include "xbt/ex.h"
+#include "surf/surf.h"
+
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_bench, smpi,
"Logging specific to SMPI (benchmarking)");
-static void smpi_execute(double duration) {
- smx_host_t host;
- smx_action_t action;
- smx_mutex_t mutex;
- smx_cond_t cond;
- e_surf_action_state_t state;
-
- if(duration > 0.001) {
- host = SIMIX_host_self();
- mutex = SIMIX_mutex_init();
- cond = SIMIX_cond_init();
- DEBUG1("Sleep for %f to handle real computation time", duration);
- duration *= xbt_cfg_get_double(_surf_cfg_set, "reference_speed");
- action = SIMIX_action_execute(host, "computation", duration);
- SIMIX_mutex_lock(mutex);
- SIMIX_register_action_to_condition(action, cond);
- for(state = SIMIX_action_get_state(action);
- state == SURF_ACTION_READY ||
- state == SURF_ACTION_RUNNING; state = SIMIX_action_get_state(action)) {
- SIMIX_cond_wait(cond, mutex);
+/* Shared allocations are handled through shared memory segments.
+ * Associated data and metadata are used as follows:
+ *
+ * mmap #1
+ * `allocs' dict ---- -.
+ * ---------- shared_data_t shared_metadata_t / | | |
+ * .->| <name> | ---> -------------------- <--. ----------------- | | | |
+ * | ---------- | fd of <name> | | | size of mmap | --| | | |
+ * | | count (2) | |-- | data | \ | | |
+ * `----------------- | <name> | | ----------------- ---- |
+ * -------------------- | ^ |
+ * | | |
+ * | | `allocs_metadata' dict |
+ * | | ---------------------- |
+ * | `-- | <addr of mmap #1> |<-'
+ * | .-- | <addr of mmap #2> |<-.
+ * | | ---------------------- |
+ * | | |
+ * | | |
+ * | | |
+ * | | mmap #2 |
+ * | v ---- -'
+ * | shared_metadata_t / | |
+ * | ----------------- | | |
+ * | | size of mmap | --| | |
+ * `-- | data | | | |
+ * ----------------- | | |
+ * \ | |
+ * ----
+ */
+
+#define PTR_STRLEN (2 + 2 * sizeof(void*) + 1)
+
+xbt_dict_t allocs = NULL; /* Allocated on first use */
+xbt_dict_t allocs_metadata = NULL; /* Allocated on first use */
+xbt_dict_t samples = NULL; /* Allocated on first use */
+xbt_dict_t calls = NULL; /* Allocated on first use */
+__thread int smpi_current_rank = 0; /* Updated after each MPI call */
+
+typedef struct {
+ int fd;
+ int count;
+ char* loc;
+} shared_data_t;
+
+typedef struct {
+ size_t size;
+ shared_data_t* data;
+} shared_metadata_t;
+
+static size_t shm_size(int fd) {
+ struct stat st;
+
+ if(fstat(fd, &st) < 0) {
+ xbt_die("Could not stat fd %d: %s", fd, strerror(errno));
+ }
+ return (size_t)st.st_size;
+}
+
+static void* shm_map(int fd, size_t size, shared_data_t* data) {
+ void* mem;
+ char loc[PTR_STRLEN];
+ shared_metadata_t* meta;
+
+ if(size > shm_size(fd)) {
+ if(ftruncate(fd, (off_t)size) < 0) {
+ xbt_die("Could not truncate fd %d to %zu: %s", fd, size, strerror(errno));
}
- SIMIX_unregister_action_to_condition(action, cond);
- SIMIX_mutex_unlock(mutex);
- SIMIX_action_destroy(action);
- SIMIX_cond_destroy(cond);
- SIMIX_mutex_destroy(mutex);
}
+ mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if(mem == MAP_FAILED) {
+ xbt_die("Could not map fd %d: %s", fd, strerror(errno));
+ }
+ if(!allocs_metadata) {
+ allocs_metadata = xbt_dict_new();
+ }
+ snprintf(loc, PTR_STRLEN, "%p", mem);
+ meta = xbt_new(shared_metadata_t, 1);
+ meta->size = size;
+ meta->data = data;
+ xbt_dict_set(allocs_metadata, loc, meta, &free);
+ XBT_DEBUG("MMAP %zu to %p", size, mem);
+ return mem;
}
-void smpi_bench_begin(int rank, const char* mpi_call) {
- double now = SIMIX_get_clock();
+void smpi_bench_destroy(void)
+{
+ xbt_dict_free(&allocs);
+ xbt_dict_free(&samples);
+ xbt_dict_free(&calls);
+}
- if(mpi_call && rank > 0 && xbt_cfg_get_int(_surf_cfg_set, "SMPE")) {
- INFO3("SMPE: ts=%f rank=%d type=end et=%s", now, rank, mpi_call);
+static void smpi_execute_flops(double flops)
+{
+ smx_action_t action;
+ smx_host_t host;
+ host = SIMIX_host_self();
+
+ XBT_DEBUG("Handle real computation time: %f flops", flops);
+ action = simcall_host_execute("computation", host, flops, 1);
+#ifdef HAVE_TRACING
+ simcall_set_category (action, TRACE_internal_smpi_get_category());
+#endif
+ simcall_host_execution_wait(action);
+}
+
+static void smpi_execute(double duration)
+{
+ /* FIXME: a global variable would be less expensive to consult than a call to xbt_cfg_get_double() right on the critical path */
+ if (duration >= xbt_cfg_get_double(_surf_cfg_set, "smpi/cpu_threshold")) {
+ XBT_DEBUG("Sleep for %f to handle real computation time", duration);
+ smpi_execute_flops(duration *
+ xbt_cfg_get_double(_surf_cfg_set,
+ "smpi/running_power"));
+ } else {
+ XBT_DEBUG("Real computation took %f while option smpi/cpu_threshold is set to %f => ignore it",
+ duration, xbt_cfg_get_double(_surf_cfg_set, "smpi/cpu_threshold"));
}
+}
+
+void smpi_bench_begin(void)
+{
xbt_os_timer_start(smpi_process_timer());
+ smpi_current_rank = smpi_process_index();
}
-void smpi_bench_end(int rank, const char* mpi_call) {
+void smpi_bench_end(void)
+{
xbt_os_timer_t timer = smpi_process_timer();
- double now = SIMIX_get_clock();
xbt_os_timer_stop(timer);
smpi_execute(xbt_os_timer_elapsed(timer));
- if(mpi_call && rank > 0 && xbt_cfg_get_int(_surf_cfg_set, "SMPE")) {
- INFO3("SMPE: ts=%f rank=%d type=begin et=%s", now, rank, mpi_call);
+}
+
+unsigned int smpi_sleep(unsigned int secs)
+{
+ smpi_bench_end();
+ smpi_execute((double) secs);
+ smpi_bench_begin();
+ return secs;
+}
+
+int smpi_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+ double now;
+ smpi_bench_end();
+ now = SIMIX_get_clock();
+ if (tv) {
+ tv->tv_sec = (time_t)now;
+ tv->tv_usec = (suseconds_t)((now - tv->tv_sec) * 1e6);
}
+ smpi_bench_begin();
+ return 0;
}
-/*
-TODO
-void smpi_do_once_1(const char *file, int line)
+extern double sg_maxmin_precision;
+unsigned long long smpi_rastro_resolution (void)
{
- smpi_do_once_duration_node_t curr, prev;
+ smpi_bench_end();
+ double resolution = (1/sg_maxmin_precision);
+ smpi_bench_begin();
+ return (unsigned long long)resolution;
+}
+unsigned long long smpi_rastro_timestamp (void)
+{
smpi_bench_end();
- SIMIX_mutex_lock(smpi_global->do_once_mutex);
- prev = NULL;
- for(curr = smpi_global->do_once_duration_nodes;
- NULL != curr && (strcmp(curr->file, file) || curr->line != line);
- curr = curr->next) {
- prev = curr;
- }
- if(NULL == curr) {
- curr = xbt_new(s_smpi_do_once_duration_node_t, 1);
- curr->file = xbt_strdup(file);
- curr->line = line;
- curr->duration = -1;
- curr->next = NULL;
- if(NULL == prev) {
- smpi_global->do_once_duration_nodes = curr;
- } else {
- prev->next = curr;
+ double now = SIMIX_get_clock();
+
+ unsigned long long sec = (unsigned long long)now;
+ unsigned long long pre = (now - sec) * smpi_rastro_resolution();
+ smpi_bench_begin();
+ return (unsigned long long)sec * smpi_rastro_resolution() + pre;
+}
+
+/* ****************************** Functions related to the SMPI_SAMPLE_ macros ************************************/
+typedef struct {
+ int iters; /* amount of requested iterations */
+ int count; /* amount of iterations done so far */
+ double threshold; /* maximal stderr requested (if positive) */
+ double relstderr; /* observed stderr so far */
+ double mean; /* mean of benched times, to be used if the block is disabled */
+ double sum; /* sum of benched times (to compute the mean and stderr) */
+ double sum_pow2; /* sum of the square of the benched times (to compute the stderr) */
+ int benching; /* 1: we are benchmarking; 0: we have enough data, no bench anymore */
+} local_data_t;
+
+static char *sample_location(int global, const char *file, int line) {
+ if (global) {
+ return bprintf("%s:%d", file, line);
+ } else {
+ return bprintf("%s:%d:%d", file, line, smpi_process_index());
+ }
+}
+static int sample_enough_benchs(local_data_t *data) {
+ int res = (data->iters > 0 && data->count >= data->iters)
+ || (data->count > 2 && data->threshold > 0.0 && data->relstderr <= data->threshold);
+ XBT_DEBUG("%s (count:%d iter:%d stderr:%f thres:%f mean:%fs)",
+ (res?"enough benchs":"need more data"),
+ data->count, data->iters, data->relstderr, data->threshold, data->mean);
+ return res;
+}
+
+void smpi_sample_1(int global, const char *file, int line, int iters, double threshold)
+{
+ char *loc = sample_location(global, file, line);
+ local_data_t *data;
+
+ smpi_bench_end(); /* Take time from previous, unrelated computation into account */
+ if (!samples)
+ samples = xbt_dict_new_homogeneous(free);
+
+ data = xbt_dict_get_or_null(samples, loc);
+ if (!data) {
+ data = (local_data_t *) xbt_new(local_data_t, 1);
+ data->count = 0;
+ data->sum = 0.0;
+ data->sum_pow2 = 0.0;
+ data->iters = iters;
+ data->threshold = threshold;
+ data->benching = 1; // If we have no data, we need at least one
+ data->mean = 0;
+ xbt_dict_set(samples, loc, data, NULL);
+ XBT_DEBUG("XXXXX First time ever on benched nest %s.",loc);
+ } else {
+ if (data->iters != iters || data->threshold != threshold) {
+ XBT_ERROR("Asked to bench block %s with different settings %d, %f is not %d, %f. How did you manage to give two numbers at the same line??",
+ loc, data->iters, data->threshold, iters,threshold);
+ THROW_IMPOSSIBLE;
}
+
+ // if we already have some data, check whether sample_2 should get one more bench or whether it should emulate the computation instead
+ data->benching = !sample_enough_benchs(data);
+ XBT_DEBUG("XXXX Re-entering the benched nest %s. %s",loc, (data->benching?"more benching needed":"we have enough data, skip computes"));
}
- smpi_global->do_once_duration = &curr->duration;
+ free(loc);
}
-int smpi_do_once_2()
+int smpi_sample_2(int global, const char *file, int line)
{
- double duration = *(smpi_global->do_once_duration);
+ char *loc = sample_location(global, file, line);
+ local_data_t *data;
+
+ xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
+ data = xbt_dict_get(samples, loc);
+ XBT_DEBUG("sample2 %s",loc);
+ free(loc);
- if(0 > duration) {
- smpi_start_timer();
+ if (data->benching==1) {
+ // we need to run a new bench
+ XBT_DEBUG("benchmarking: count:%d iter:%d stderr:%f thres:%f; mean:%f",
+ data->count, data->iters, data->relstderr, data->threshold, data->mean);
+ smpi_bench_begin();
return 1;
+ } else {
+ // Enough data, no more bench (either we got enough data from previous visits to this benched nest, or we just ran one bench and need to bail out now that our job is done).
+ // Just sleep instead
+ XBT_DEBUG("No benchmark (either no need, or just ran one): count >= iter (%d >= %d) or stderr<thres (%f<=%f). apply the %fs delay instead",
+ data->count, data->iters, data->relstderr, data->threshold, data->mean);
+ smpi_execute(data->mean);
+
+ smpi_bench_begin(); // prepare to capture future, unrelated computations
+ return 0;
}
- SIMIX_mutex_unlock(smpi_global->do_once_mutex);
- smpi_execute(duration);
- smpi_bench_begin();
- return 0;
}
-void smpi_do_once_3()
+
+void smpi_sample_3(int global, const char *file, int line)
+{
+ char *loc = sample_location(global, file, line);
+ local_data_t *data;
+
+ xbt_assert(samples, "Y U NO use SMPI_SAMPLE_* macros? Stop messing directly with smpi_sample_* functions!");
+ data = xbt_dict_get(samples, loc);
+ XBT_DEBUG("sample3 %s",loc);
+
+ if (data->benching==0) {
+ THROW_IMPOSSIBLE;
+ }
+
+ // ok, benchmarking this loop is over
+ xbt_os_timer_stop(smpi_process_timer());
+
+ // update the stats
+ double sample, n;
+ data->count++;
+ sample = xbt_os_timer_elapsed(smpi_process_timer());
+ data->sum += sample;
+ data->sum_pow2 += sample * sample;
+ n = (double)data->count;
+ data->mean = data->sum / n;
+ data->relstderr = sqrt((data->sum_pow2 / n - data->mean * data->mean) / n) / data->mean;
+ if (!sample_enough_benchs(data)) {
+ data->mean = sample; // Still in benching process; We want sample_2 to simulate the exact time of this loop occurrence before leaving, not the mean over the history
+ }
+ XBT_DEBUG("Average mean after %d steps is %f, relative standard error is %f (sample was %f)", data->count,
+ data->mean, data->relstderr, sample);
+
+ // That's enough for now, prevent sample_2 to run the same code over and over
+ data->benching = 0;
+}
+
+void smpi_sample_flops(double flops)
+{
+ smpi_execute_flops(flops);
+}
+
+void *smpi_shared_malloc(size_t size, const char *file, int line)
{
- *(smpi_global->do_once_duration) = smpi_stop_timer();
+ char *loc = bprintf("%zu_%s_%d", (size_t)getpid(), file, line);
+ size_t len = strlen(loc);
+ size_t i;
+ int fd;
+ void* mem;
+ shared_data_t *data;
+
+ for(i = 0; i < len; i++) {
+ /* Make the 'loc' ID be a flat filename */
+ if(loc[i] == '/') {
+ loc[i] = '_';
+ }
+ }
+ if (!allocs) {
+ allocs = xbt_dict_new_homogeneous(free);
+ }
+ data = xbt_dict_get_or_null(allocs, loc);
+ if(!data) {
+ fd = shm_open(loc, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+ if(fd < 0) {
+ switch(errno) {
+ case EEXIST:
+ xbt_die("Please cleanup /dev/shm/%s", loc);
+ default:
+ xbt_die("An unhandled error occured while opening %s: %s", loc, strerror(errno));
+ }
+ }
+ data = xbt_new(shared_data_t, 1);
+ data->fd = fd;
+ data->count = 1;
+ data->loc = loc;
+ mem = shm_map(fd, size, data);
+ if(shm_unlink(loc) < 0) {
+ XBT_WARN("Could not early unlink %s: %s", loc, strerror(errno));
+ }
+ xbt_dict_set(allocs, loc, data, NULL);
+ XBT_DEBUG("Mapping %s at %p through %d", loc, mem, fd);
+ } else {
+ mem = shm_map(data->fd, size, data);
+ data->count++;
+ }
+ XBT_DEBUG("Malloc %zu in %p (metadata at %p)", size, mem, data);
+ return mem;
+}
+
+void smpi_shared_free(void *ptr)
+{
+ char loc[PTR_STRLEN];
+ shared_metadata_t* meta;
+ shared_data_t* data;
+
+ if (!allocs) {
+ XBT_WARN("Cannot free: nothing was allocated");
+ return;
+ }
+ if(!allocs_metadata) {
+ XBT_WARN("Cannot free: no metadata was allocated");
+ }
+ snprintf(loc, PTR_STRLEN, "%p", ptr);
+ meta = (shared_metadata_t*)xbt_dict_get_or_null(allocs_metadata, loc);
+ if (!meta) {
+ XBT_WARN("Cannot free: %p was not shared-allocated by SMPI", ptr);
+ return;
+ }
+ data = meta->data;
+ if(!data) {
+ XBT_WARN("Cannot free: something is broken in the metadata link");
+ return;
+ }
+ if(munmap(ptr, meta->size) < 0) {
+ XBT_WARN("Unmapping of fd %d failed: %s", data->fd, strerror(errno));
+ }
+ data->count--;
+ if (data->count <= 0) {
+ close(data->fd);
+ xbt_dict_remove(allocs, data->loc);
+ free(data->loc);
+ }
+}
+
+int smpi_shared_known_call(const char* func, const char* input) {
+ char* loc = bprintf("%s:%s", func, input);
+ xbt_ex_t ex;
+ int known;
+
+ if(!calls) {
+ calls = xbt_dict_new_homogeneous(NULL);
+ }
+ TRY {
+ xbt_dict_get(calls, loc); /* Succeed or throw */
+ known = 1;
+ }
+ CATCH(ex) {
+ if(ex.category == not_found_error) {
+ known = 0;
+ xbt_ex_free(ex);
+ } else {
+ RETHROW;
+ }
+ }
+ free(loc);
+ return known;
+}
+
+void* smpi_shared_get_call(const char* func, const char* input) {
+ char* loc = bprintf("%s:%s", func, input);
+ void* data;
+
+ if(!calls) {
+ calls = xbt_dict_new_homogeneous(NULL);
+ }
+ data = xbt_dict_get(calls, loc);
+ free(loc);
+ return data;
+}
+
+void* smpi_shared_set_call(const char* func, const char* input, void* data) {
+ char* loc = bprintf("%s:%s", func, input);
+
+ if(!calls) {
+ calls = xbt_dict_new_homogeneous(NULL);
+ }
+ xbt_dict_set(calls, loc, data, NULL);
+ free(loc);
+ return data;
}
-*/
