[152] | 1 | /* SolarSim.c */ |
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| 2 | #include "SolarSim.h" |
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| 3 | |
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| 4 | int sock = 0; |
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| 5 | |
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| 6 | long SIM_STEPS, DT, SAVE; |
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| 7 | |
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| 8 | void |
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| 9 | do_work(AState state) { |
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| 10 | int i, j; |
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| 11 | long sim_step; |
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| 12 | real norm_square, norm; |
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| 13 | int n = state->particles; |
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| 14 | vector *r = state->positions; |
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| 15 | vector *v = state->velocities; |
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| 16 | vector *a = state->accelerations; |
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| 17 | real *m = state->masses; |
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| 18 | |
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| 19 | sim_step = 0; |
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| 20 | while( sim_step < SIM_STEPS ) { |
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| 21 | if( (SAVE != 0) && (sim_step % SAVE == 0) ) { |
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| 22 | write_state(sock, state); |
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| 23 | } |
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| 24 | |
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| 25 | // compute accelerations |
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| 26 | memset( a, 0, n * sizeof(vector) ); |
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| 27 | for( i = 0; i < n-1; i++ ) { |
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| 28 | for( j = i+1; j < n; j++ ) { |
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| 29 | compute_acc(r+i, r+j, v+i, v+j, a+i, a+j, m[i], m[j]); |
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| 30 | } |
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| 31 | } |
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| 32 | |
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| 33 | // update positions and speeds |
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| 34 | for( i = 0; i < n; i++ ) { |
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| 35 | update_pos_vel(r+i, v+i, a+i, DT); |
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| 36 | } |
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| 37 | |
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| 38 | sim_step ++; |
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| 39 | } |
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| 40 | |
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| 41 | if( SAVE != 0 ) |
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| 42 | write_state(sock, state); |
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| 43 | } |
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| 44 | |
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| 45 | int |
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| 46 | main( int argc, char **argv ) { |
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| 47 | TState state; |
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| 48 | double before, after; |
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| 49 | int i; |
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| 50 | |
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| 51 | SIM_STEPS = atol(argv[3]); |
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| 52 | DT = atol(argv[4]); |
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| 53 | SAVE = atol(argv[5]); |
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| 54 | |
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| 55 | if( SAVE != 0 ) { |
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| 56 | sock = open( argv[2], O_WRONLY | O_CREAT | O_TRUNC, 644 ); |
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| 57 | } |
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| 58 | |
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| 59 | read_initial( &state, argv[1] ); |
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| 60 | |
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| 61 | before = omp_get_wtime(); |
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| 62 | do_work(&state); |
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| 63 | after = omp_get_wtime(); |
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| 64 | |
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| 65 | if( SAVE != 0 ) { |
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| 66 | i = 0; |
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| 67 | write( sock, &i, sizeof(int) ); |
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| 68 | close(sock); |
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| 69 | } |
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| 70 | |
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| 71 | printf("%li s %lf\n", SIM_STEPS, after-before); |
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| 72 | |
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| 73 | return EXIT_SUCCESS; |
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| 74 | } |
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| 75 | |
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