1 | /* |
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2 | * swift_context.c |
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3 | * |
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4 | * (c) 2009 Ionut Rosoiu <ionut.rosoiu@gmail.com> |
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5 | * |
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6 | */ |
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7 | |
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8 | #include <stdio.h> |
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9 | #include <stdlib.h> |
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10 | #include "swift.h" |
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11 | |
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12 | typedef struct fibo_data { |
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13 | int n; |
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14 | int *r; |
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15 | // sync related |
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16 | swift_size_t sync_frames_remaining; |
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17 | char _pad[SWIFT_CACHE_LINE_SIZE - sizeof(swift_size_t)]; |
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18 | } fibo_data_t; |
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19 | |
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20 | /* forward declaration for the fibo() */ |
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21 | void fibo(swift_thread_t *thread, swift_frame_t *frame); |
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22 | |
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23 | |
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24 | /* void fibo(int r, shared_w int* r) */ |
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25 | void fibo(swift_thread_t *thread, swift_frame_t *frame) { |
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26 | fibo_data_t *data = frame->private_data; |
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27 | swift_status_t status; |
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28 | swift_size_t n; |
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29 | |
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30 | SWIFT_LOG_FRAME_INFO_STR("\nfibo() ", thread, frame); |
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31 | |
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32 | if (data->n < 2) { |
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33 | *data->r = data->n; |
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34 | data->sync_frames_remaining = 0; |
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35 | |
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36 | } else { |
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37 | // fibo(n-1) data |
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38 | swift_frame_t *frame1; |
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39 | fibo_data_t *data1; |
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40 | |
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41 | // fibo(n-2) data |
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42 | swift_frame_t *frame2; |
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43 | fibo_data_t *data2; |
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44 | |
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45 | int r1, r2; |
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46 | |
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47 | /* spawn fibo(n-1, r1); */ |
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48 | frame1 = (swift_frame_t*) swift_malloc(thread, sizeof(swift_frame_t) + sizeof(fibo_data_t), &status); |
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49 | frame1->closure = fibo; |
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50 | #ifdef LOGGING_ON |
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51 | frame1->creator_id = thread->id; |
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52 | frame1->dbg = data->n - 1; |
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53 | #endif |
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54 | |
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55 | data1 = (fibo_data_t*) ((char*)frame1 + sizeof(swift_frame_t)); |
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56 | data1->n = data->n - 1; |
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57 | data1->r = &r1; |
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58 | frame1->private_data = data1; |
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59 | |
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60 | SWIFT_WRITE_FRAME_INFO(frame1, thread->id, 'f', thread->frame_no++); |
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61 | // sync related |
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62 | frame1->dependencies_frame = NULL; |
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63 | frame1->sync_frames_remaining = &data->sync_frames_remaining; |
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64 | |
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65 | /* spawn fibo(n-2, r2); */ |
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66 | frame2 = (swift_frame_t*) swift_malloc(thread, sizeof(swift_frame_t) + sizeof(fibo_data_t), &status); |
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67 | frame2->closure = fibo; |
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68 | #ifdef LOGGING_ON |
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69 | frame2->creator_id = thread->id; |
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70 | frame2->dbg = data->n - 2; |
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71 | #endif |
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72 | |
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73 | data2 = (fibo_data_t*) ((char*)frame2 + sizeof(swift_frame_t)); |
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74 | data2->n = data->n - 2; |
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75 | data2->r = &r2; |
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76 | frame2->private_data = data2; |
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77 | |
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78 | SWIFT_WRITE_FRAME_INFO(frame2, thread->id, 'f', thread->frame_no++); |
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79 | frame2->dependencies_frame = NULL; |
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80 | frame2->sync_frames_remaining = &data->sync_frames_remaining; |
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81 | |
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82 | // wait for 1,2 to finish |
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83 | data->sync_frames_remaining = 2; |
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84 | |
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85 | // add 1 & 2 in the workque |
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86 | swift_deque_push(&thread->workque, frame1, &status); |
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87 | swift_deque_push(&thread->workque, frame2, &status); |
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88 | |
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89 | /* ksync; */ |
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90 | while ((n = SWIFT_ATOMIC_READ(data->sync_frames_remaining))) { |
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91 | SWIFT_LOG(INFO, "[%d] %s rem=%d c=%d f=%c.%d (%d)\n", thread->id, "@sync", n, |
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92 | SWIFT_PROC(frame->info), SWIFT_FRAME_NAME(frame->info), |
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93 | frame->dbg, SWIFT_FRAME_ID(frame->info)); |
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94 | swift_scheduler_execute(thread, &status); |
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95 | } |
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96 | |
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97 | *data->r = r1 + r2; |
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98 | } |
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99 | |
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100 | SWIFT_LOG(INFO, "[%d] __fibo(%d)=%d\n", thread->id, data->n, *data->r); |
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101 | |
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102 | swift_signal_frame_done(thread, frame, &status); |
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103 | swift_frame_done(thread->context, thread, frame, &status); |
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104 | } |
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105 | |
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106 | void* thread_start(void *arg) { |
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107 | swift_thread_t *thread = arg; |
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108 | swift_status_t status; |
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109 | |
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110 | SWIFT_LOG(INFO, "_____started thread %d\n", thread->id); |
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111 | |
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112 | while (! thread->context->parallel_finished) { |
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113 | swift_scheduler_execute(thread, &status); |
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114 | } |
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115 | |
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116 | SWIFT_LOG(INFO, "_____finished thread %d: %d frames processed\n", thread->id, thread->stats); |
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117 | printf("_____finished thread %d: %d frames processed\n", thread->id, thread->stats); |
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118 | |
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119 | return arg; |
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120 | } |
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121 | |
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122 | int main(int argc, char **argv) { |
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123 | swift_context_t context; |
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124 | swift_status_t status; |
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125 | swift_frame_t *frame; |
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126 | fibo_data_t *data; |
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127 | int i, r; |
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128 | int nthreads, n; |
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129 | |
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130 | if (argc != 3) { |
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131 | fprintf(stderr, "usage: %s Nthreads N\n", argv[0]); |
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132 | abort(); |
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133 | } |
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134 | |
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135 | nthreads = strtol(argv[1], NULL, 10); |
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136 | n = strtol(argv[2], NULL, 10); |
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137 | |
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138 | SWIFT_LOG(INFO, "Started nthreads=%d n=%d\n", nthreads, n); |
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139 | |
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140 | /* initialize the context */ |
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141 | swift_context_init(&context, nthreads, &status); |
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142 | |
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143 | /* push the first frame */ |
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144 | frame = (swift_frame_t*) swift_malloc(&context.threads[0], sizeof(swift_frame_t) + sizeof(fibo_data_t), &status); |
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145 | SWIFT_FRAME_SET_END_PARALLEL(frame); |
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146 | frame->creator_id = 0; |
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147 | frame->closure = fibo; |
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148 | frame->dbg = n; |
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149 | |
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150 | data = (fibo_data_t*) ((char*)frame + sizeof(swift_frame_t)); |
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151 | data->n = n; |
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152 | data->r = &r; |
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153 | frame->private_data = data; |
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154 | |
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155 | SWIFT_WRITE_FRAME_INFO(frame, 0, 'f', context.threads[0].frame_no++); |
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156 | SWIFT_LOG_FRAME_INFO((&context.threads[0]), frame); |
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157 | |
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158 | // no wait frame |
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159 | frame->dependencies_no = 0; |
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160 | frame->dependencies_frame = NULL; |
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161 | frame->sync_frames_remaining = &data->sync_frames_remaining; // doesn't matter |
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162 | |
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163 | swift_deque_push(&context.threads[0].workque, frame, &status); |
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164 | SWIFT_LOG(INFO, "pushed first frame\n"); |
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165 | |
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166 | |
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167 | /* start the threads */ |
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168 | for (i=0; i<nthreads; i++) { |
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169 | swift_thread_start(&context.threads[i], thread_start, &status); |
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170 | } |
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171 | |
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172 | /* wait for the threads to finish */ |
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173 | for (i=0; i<nthreads; i++) { |
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174 | SWIFT_LOG(INFO, "_____waiting %d\n", i); |
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175 | swift_thread_wait(&context.threads[i], &status); |
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176 | SWIFT_LOG(INFO, "_____waiting %d done\n", i); |
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177 | } |
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178 | |
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179 | /* check the result */ |
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180 | printf("computed result for fibo(%d)=%d\n", n, r); |
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181 | swift_context_destroy(&context, &status); |
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182 | |
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183 | return 0; |
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184 | } |
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