61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <assert.h>
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/* Non standard include */
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#include <commtech.h>
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#define CACHE_SIZE (32 * 1024)
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static volatile uintptr_t *line_array;
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static int write_idx, read_idx;
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static int lines_per_calc;
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#define CACHE_LINE_ENTRIES (CACHE_LINE_SIZE / sizeof(*line_array))
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int init_calc(int lines_per_calc_param)
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{
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int i;
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assert(!(CACHE_SIZE % (lines_per_calc_param * CACHE_LINE_SIZE)));
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lines_per_calc = lines_per_calc_param;
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write_idx = 0;
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read_idx = 0;
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srand(42);
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if (posix_memalign((void **) &line_array, CACHE_LINE_SIZE, CACHE_SIZE))
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{
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fprintf(stderr, "calc_line: Unable to allocate memory for random line-sized calculation\n");
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return -1;
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}
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for (i = 0; i < CACHE_SIZE / sizeof(*line_array); i++)
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line_array[i] = rand();
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return 0;
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}
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void **do_calc(void)
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{
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int next_stop_read_idx, mres, cur_write_idx;
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mres = 0;
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next_stop_read_idx = read_idx + lines_per_calc * CACHE_LINE_ENTRIES;
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for (; read_idx < next_stop_read_idx; read_idx += CACHE_LINE_ENTRIES)
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{
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mres += line_array[read_idx];
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line_array[read_idx]++;
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}
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read_idx %= CACHE_SIZE / sizeof(*line_array);
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cur_write_idx = write_idx;
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write_idx++;
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write_idx %= CACHE_SIZE / sizeof(*line_array);
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line_array[cur_write_idx] = mres;
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return (void **) &line_array[cur_write_idx];
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}
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int end_calc(void)
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{
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free((void *) line_array);
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return 0;
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}
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