1 /* Copyright (c) 2012-2017. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "src/internal_config.h" // HAVE_FUTEX_H
7 #include <simgrid/msg.h>
9 #include <xbt/parmap.hpp>
12 #include <numeric> // std::iota
16 XBT_LOG_NEW_DEFAULT_CATEGORY(parmap_bench, "Bench for parmap");
18 #define MODES_DEFAULT 0x7
20 #define ARRAY_SIZE 10007
23 void (*fun_to_apply)(unsigned*);
25 static std::string parmap_mode_name(e_xbt_parmap_mode_t mode)
29 case XBT_PARMAP_POSIX:
32 case XBT_PARMAP_FUTEX:
35 case XBT_PARMAP_BUSY_WAIT:
38 case XBT_PARMAP_DEFAULT:
42 name = "UNKNOWN(" + std::to_string(mode) + ")";
48 static bool parmap_skip_mode(e_xbt_parmap_mode_t mode)
50 return mode == XBT_PARMAP_FUTEX && not HAVE_FUTEX_H;
53 static unsigned fibonacci(unsigned n)
58 return fibonacci(n - 1) + fibonacci(n - 2);
61 static void fun_small_comp(unsigned* arg)
66 static void fun_big_comp(unsigned* arg)
68 *arg = fibonacci(*arg % FIBO_MAX);
71 static void bench_parmap_full(int nthreads, e_xbt_parmap_mode_t mode)
73 XBT_INFO("** mode = %s", parmap_mode_name(mode).c_str());
75 if (parmap_skip_mode(mode)) {
76 XBT_INFO(" not available");
80 std::vector<unsigned> a(ARRAY_SIZE);
81 std::vector<unsigned*> data(ARRAY_SIZE);
82 std::iota(begin(a), end(a), 0);
83 std::iota(begin(data), end(data), &a[0]);
86 double start_time = xbt_os_time();
90 simgrid::xbt::Parmap<unsigned*> parmap(nthreads, mode);
91 parmap.apply(fun_to_apply, data);
92 } // enclosing block to ensure that the parmap is destroyed here.
93 elapsed_time = xbt_os_time() - start_time;
95 } while (elapsed_time < TIMEOUT);
97 XBT_INFO(" ran %d times in %g seconds (%g/s)", i, elapsed_time, i / elapsed_time);
100 static void bench_parmap_apply(int nthreads, e_xbt_parmap_mode_t mode)
102 XBT_INFO("** mode = %s", parmap_mode_name(mode).c_str());
104 if (parmap_skip_mode(mode)) {
105 XBT_INFO(" not available");
109 std::vector<unsigned> a(ARRAY_SIZE);
110 std::vector<unsigned*> data(ARRAY_SIZE);
111 std::iota(begin(a), end(a), 0);
112 std::iota(begin(data), end(data), &a[0]);
114 simgrid::xbt::Parmap<unsigned*> parmap(nthreads, mode);
116 double start_time = xbt_os_time();
119 parmap.apply(fun_to_apply, data);
120 elapsed_time = xbt_os_time() - start_time;
122 } while (elapsed_time < TIMEOUT);
124 XBT_INFO(" ran %d times in %g seconds (%g/s)", i, elapsed_time, i / elapsed_time);
127 static void bench_all_modes(void (*bench_fun)(int, e_xbt_parmap_mode_t), int nthreads, unsigned modes)
129 std::vector<e_xbt_parmap_mode_t> all_modes = {XBT_PARMAP_POSIX, XBT_PARMAP_FUTEX, XBT_PARMAP_BUSY_WAIT,
132 for (unsigned i = 0; i < all_modes.size(); i++) {
134 bench_fun(nthreads, all_modes[i]);
138 int main(int argc, char* argv[])
141 unsigned modes = MODES_DEFAULT;
143 xbt_log_control_set("parmap_bench.fmt:[%c/%p]%e%m%n");
144 MSG_init(&argc, argv);
146 if (argc != 2 && argc != 3) {
147 XBT_INFO("Usage: %s nthreads [modes]", argv[0]);
148 XBT_INFO(" nthreads - number of working threads");
149 XBT_INFO(" modes - bitmask of modes to test");
152 nthreads = atoi(argv[1]);
154 XBT_ERROR("Invalid thread count: %d", nthreads);
158 modes = strtol(argv[2], NULL, 0);
160 XBT_INFO("Parmap benchmark with %d workers (modes = %#x)...", nthreads, modes);
163 fun_to_apply = &fun_small_comp;
165 XBT_INFO("Benchmark for parmap create+apply+destroy (small comp):");
166 bench_all_modes(bench_parmap_full, nthreads, modes);
169 XBT_INFO("Benchmark for parmap apply only (small comp):");
170 bench_all_modes(bench_parmap_apply, nthreads, modes);
173 fun_to_apply = &fun_big_comp;
175 XBT_INFO("Benchmark for parmap create+apply+destroy (big comp):");
176 bench_all_modes(bench_parmap_full, nthreads, modes);
179 XBT_INFO("Benchmark for parmap apply only (big comp):");
180 bench_all_modes(bench_parmap_apply, nthreads, modes);