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66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
12 months ago
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/time.h>
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//The number of numbers that populate the file
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#define TEST_SIZE 1
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#define BUF_SIZE 2097152//16 MegaBytes
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#define BUF_SIZE_HGB 67108864//512 MegaBytes
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#define BUF_SIZE_GB 134217728//1 GigaBytes
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#define BUF_SIZE_10GB 1342177280//10 GigaBytes
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/*
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Generate a file of given size filling it with random 8 bytes numbers.
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Return the number of microseconds needed for the generation and writing on disk.
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*/
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long long benchmark_generate_file(const char *pathname, unsigned int seed)
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{
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struct timeval start, end;
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unsigned int size = 0;
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FILE *file;
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int64_t *buffer;
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srand(seed);
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// if (access(pathname, F_OK) == 0)
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// return -2;//File already exist
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if (size == 0)
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{
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printf("Insert a multiple of %d(%d MegaBytes) for the size of the target file:\n", BUF_SIZE_GB, BUF_SIZE_GB/131072);
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while (1)
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{
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if (scanf("%u", &size) != 1)
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{
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printf("Insert a valid size for the file:\n");
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while (getchar() != '\n');//Clear the input buffer to prevent an infinite loop
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}
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else
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break;
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}
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printf("Future file dimension: (%d * %u) Mb\n",BUF_SIZE_GB/131072, size);
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}
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buffer = (int64_t*)malloc(BUF_SIZE_GB * sizeof(int64_t));
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if (!buffer)
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return -1;//Something went wrong
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file = fopen(pathname, "wb");
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if (!file){
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free(buffer);
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return -1;//Something went wrong
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}
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gettimeofday(&start, NULL);//Timer Start
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for (unsigned int i = 0; i < size; i++)
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{
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for(unsigned int j=0; j < BUF_SIZE_GB; j++)
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{
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buffer[j] = ((int64_t)rand() << 32) | rand();
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// printf("%ld\n", buffer[j]);
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}
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fwrite(buffer, sizeof(int64_t), BUF_SIZE_GB, file);
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}
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gettimeofday(&end, NULL);//Timer Stop
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free(buffer);
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fclose(file);
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return (end.tv_sec - start.tv_sec) * 1000000LL + (end.tv_usec - start.tv_usec);
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}
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