[b374dbc] | 1 | #include "rq_bench.hfa" |
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| 2 | #include <fstream.hfa> |
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| 3 | |
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| 4 | Duration default_preemption() { |
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| 5 | return 0; |
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| 6 | } |
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| 7 | |
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| 8 | #define PRINT(...) |
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| 9 | |
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| 10 | __lehmer64_state_t lead_seed; |
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| 11 | volatile unsigned leader; |
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| 12 | volatile size_t lead_idx; |
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| 13 | |
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| 14 | bool exhaust = false; |
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| 15 | |
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[e49b6f5] | 16 | thread$ * the_main; |
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[b374dbc] | 17 | |
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| 18 | thread __attribute__((aligned(128))) MyThread { |
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| 19 | unsigned id; |
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| 20 | volatile size_t idx; |
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| 21 | bench_sem sem; |
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| 22 | size_t rechecks; |
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| 23 | }; |
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| 24 | |
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| 25 | void ?{}( MyThread & this, unsigned id ) { |
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| 26 | ((thread&)this){ bench_cluster }; |
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| 27 | this.id = id; |
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| 28 | this.idx = 0; |
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| 29 | this.rechecks = 0; |
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| 30 | } |
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| 31 | |
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| 32 | MyThread ** threads; |
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| 33 | |
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| 34 | static void waitgroup() { |
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| 35 | Time start = timeHiRes(); |
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| 36 | for(i; nthreads) { |
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| 37 | PRINT( sout | "Waiting for :" | i | "(" | threads[i]->idx | ")"; ) |
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| 38 | while( threads[i]->idx != lead_idx ) { |
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| 39 | Pause(); |
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| 40 | if( (timeHiRes() - start) > 5`s ) { |
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[ebb6158] | 41 | print_stats_now( bench_cluster, CFA_STATS_READY_Q | CFA_STATS_IO ); |
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[b374dbc] | 42 | serr | "Programs has been blocked for more than 5 secs"; |
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| 43 | exit(1); |
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| 44 | } |
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| 45 | } |
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| 46 | } |
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| 47 | PRINT( sout | "Waiting done"; ) |
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| 48 | } |
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| 49 | |
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| 50 | static void wakegroup(unsigned me) { |
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| 51 | if(!exhaust) return; |
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| 52 | |
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| 53 | for(i; nthreads) { |
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| 54 | if(i!= me) post( threads[i]->sem ); |
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| 55 | } |
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| 56 | } |
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| 57 | |
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| 58 | static void lead(MyThread & this) { |
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| 59 | this.idx = ++lead_idx; |
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| 60 | if(lead_idx > stop_count) { |
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| 61 | PRINT( sout | "Leader" | this.id | "done"; ) |
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| 62 | unpark( the_main ); |
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| 63 | return; |
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| 64 | } |
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| 65 | |
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| 66 | PRINT( sout | "Leader no" | this.idx| ":" | this.id; ) |
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| 67 | |
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| 68 | waitgroup(); |
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| 69 | |
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| 70 | unsigned nleader = __lehmer64( lead_seed ) % nthreads; |
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| 71 | __atomic_store_n( &leader, nleader, __ATOMIC_SEQ_CST ); |
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| 72 | |
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| 73 | wakegroup(this.id); |
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| 74 | } |
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| 75 | |
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| 76 | static void wait(MyThread & this) { |
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| 77 | yield(); |
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| 78 | if(lead_idx == this.idx) { |
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| 79 | this.rechecks++; |
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| 80 | return; |
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| 81 | } |
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| 82 | |
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| 83 | assert( (lead_idx - 1) == this.idx ); |
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| 84 | __atomic_add_fetch( &this.idx, 1, __ATOMIC_SEQ_CST ); |
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| 85 | if(exhaust) wait( this.sem ); |
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| 86 | else yield(); |
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| 87 | } |
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| 88 | |
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| 89 | void main(MyThread & this) { |
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| 90 | park(); |
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| 91 | |
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| 92 | unsigned me = this.id; |
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| 93 | |
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| 94 | for() { |
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| 95 | if(leader == me) { |
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| 96 | lead( this ); |
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| 97 | } |
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| 98 | else { |
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| 99 | wait( this ); |
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| 100 | } |
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| 101 | if(lead_idx > stop_count) break; |
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| 102 | } |
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| 103 | } |
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| 104 | |
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| 105 | // ================================================== |
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| 106 | int main(int argc, char * argv[]) { |
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| 107 | __lehmer64_state_t lead_seed = getpid(); |
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| 108 | for(10) __lehmer64( lead_seed ); |
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| 109 | unsigned nprocs = 2; |
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| 110 | |
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| 111 | cfa_option opt[] = { |
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| 112 | BENCH_OPT, |
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[ebb6158] | 113 | { 'e', "exhaust", "Whether or not threads that have seen the new epoch should park instead of yielding.", exhaust, parse_yesno} |
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[b374dbc] | 114 | }; |
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| 115 | BENCH_OPT_PARSE("cforall transition benchmark"); |
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| 116 | |
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| 117 | if(clock_mode) { |
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| 118 | serr | "This benchmark doesn't support duration mode"; |
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| 119 | return 1; |
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| 120 | } |
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| 121 | |
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| 122 | if(nprocs < 2) { |
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| 123 | serr | "Must have at least 2 processors"; |
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| 124 | return 1; |
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| 125 | } |
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| 126 | |
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| 127 | lead_idx = 0; |
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| 128 | leader = __lehmer64( lead_seed ) % nthreads; |
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| 129 | |
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| 130 | size_t rechecks = 0; |
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| 131 | the_main = active_thread(); |
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| 132 | |
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| 133 | Time start, end; |
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| 134 | { |
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| 135 | BenchCluster bc = { nprocs }; |
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| 136 | { |
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| 137 | threads = alloc(nthreads); |
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| 138 | for(i; nthreads) { |
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| 139 | threads[i] = malloc(); |
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| 140 | (*threads[i]){ |
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| 141 | i |
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| 142 | }; |
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| 143 | } |
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| 144 | |
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| 145 | start = timeHiRes(); |
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| 146 | for(i; nthreads) { |
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| 147 | unpark(*threads[i]); |
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| 148 | } |
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| 149 | |
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| 150 | park(); |
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| 151 | end = timeHiRes(); |
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| 152 | |
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| 153 | for(i; nthreads) { |
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| 154 | post(threads[i]->sem); |
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| 155 | } |
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| 156 | |
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| 157 | for(i; nthreads) { |
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| 158 | MyThread & thrd = join(*threads[i]); |
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| 159 | PRINT( sout | i | "joined"; ) |
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| 160 | rechecks += thrd.rechecks; |
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| 161 | ^( *threads[i] ){}; |
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| 162 | free(threads[i]); |
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| 163 | } |
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| 164 | |
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| 165 | free(threads); |
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| 166 | } |
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| 167 | } |
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| 168 | |
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| 169 | sout | "Duration : " | ws(3, 3, unit(eng((end - start)`ds))) | 's'; |
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| 170 | sout | "Number of processors : " | nprocs; |
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| 171 | sout | "Number of threads : " | nthreads; |
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| 172 | sout | "Total Operations(ops) : " | stop_count; |
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| 173 | sout | "Threads parking on wait : " | (exhaust ? "yes" : "no"); |
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| 174 | sout | "Rechecking : " | rechecks; |
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| 175 | |
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| 176 | |
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| 177 | } |
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