1 /* Copyright (c) 2012-2019. 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 "xbt/parmap.hpp"
8 #include <simgrid/msg.h>
12 #include <numeric> // std::iota
16 XBT_LOG_NEW_DEFAULT_CATEGORY(parmap_bench, "Bench for parmap");
18 #define MODES_DEFAULT 0x7
19 #define ARRAY_SIZE 10007
22 void (*fun_to_apply)(unsigned*);
24 static std::string parmap_mode_name(e_xbt_parmap_mode_t mode)
28 case XBT_PARMAP_POSIX:
31 case XBT_PARMAP_FUTEX:
34 case XBT_PARMAP_BUSY_WAIT:
37 case XBT_PARMAP_DEFAULT:
41 name = "UNKNOWN(" + std::to_string(mode) + ")";
47 static unsigned fibonacci(unsigned n)
52 return fibonacci(n - 1) + fibonacci(n - 2);
55 static void fun_small_comp(unsigned* arg)
60 static void fun_big_comp(unsigned* arg)
62 *arg = fibonacci(*arg % FIBO_MAX);
65 static void bench_parmap(int nthreads, double timeout, e_xbt_parmap_mode_t mode, bool full_bench)
67 XBT_INFO("** mode = %s", parmap_mode_name(mode).c_str());
69 if (mode == XBT_PARMAP_FUTEX && not HAVE_FUTEX_H) {
70 XBT_INFO(" not available");
74 std::vector<unsigned> a(ARRAY_SIZE);
75 std::vector<unsigned*> data(ARRAY_SIZE);
76 std::iota(begin(a), end(a), 0);
77 std::iota(begin(data), end(data), &a[0]);
79 auto* parmap = new simgrid::xbt::Parmap<unsigned*>(nthreads, mode);
81 double start_time = xbt_os_time();
86 parmap = new simgrid::xbt::Parmap<unsigned*>(nthreads, mode);
88 parmap->apply(fun_to_apply, data);
89 elapsed_time = xbt_os_time() - start_time;
91 } while (elapsed_time < timeout);
94 XBT_INFO(" ran %d times in %g seconds (%g/s)", i, elapsed_time, i / elapsed_time);
97 static void bench_all_modes(int nthreads, double timeout, unsigned modes, bool full_bench)
99 std::vector<e_xbt_parmap_mode_t> all_modes = {XBT_PARMAP_POSIX, XBT_PARMAP_FUTEX, XBT_PARMAP_BUSY_WAIT,
102 for (unsigned i = 0; i < all_modes.size(); i++) {
104 bench_parmap(nthreads, timeout, all_modes[i], full_bench);
108 int main(int argc, char* argv[])
112 unsigned modes = MODES_DEFAULT;
114 xbt_log_control_set("parmap_bench.fmt:[%c/%p]%e%m%n");
115 MSG_init(&argc, argv);
117 if (argc != 3 && argc != 4) {
118 XBT_INFO("Usage: %s nthreads timeout [modes]", argv[0]);
119 XBT_INFO(" nthreads - number of working threads");
120 XBT_INFO(" timeout - max duration for each test");
121 XBT_INFO(" modes - bitmask of modes to test");
124 nthreads = atoi(argv[1]);
126 XBT_ERROR("Invalid thread count: %d", nthreads);
129 timeout = atof(argv[2]);
131 modes = strtol(argv[2], NULL, 0);
133 XBT_INFO("Parmap benchmark with %d workers (modes = %#x)...", nthreads, modes);
136 SIMIX_context_set_nthreads(nthreads);
137 fun_to_apply = &fun_small_comp;
139 XBT_INFO("Benchmark for parmap create+apply+destroy (small comp):");
140 bench_all_modes(nthreads, timeout, modes, true);
143 XBT_INFO("Benchmark for parmap apply only (small comp):");
144 bench_all_modes(nthreads, timeout, modes, false);
147 fun_to_apply = &fun_big_comp;
149 XBT_INFO("Benchmark for parmap create+apply+destroy (big comp):");
150 bench_all_modes(nthreads, timeout, modes, true);
153 XBT_INFO("Benchmark for parmap apply only (big comp):");
154 bench_all_modes(nthreads, timeout, modes, false);