Ajay Mohan / Rasperf

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Commit e65c4ba7dedcbf34eb292c1fd19f7fb2b25a6078

Authored by Aravind Kumar
1 parent bfd14a387e
Exists in master

File read time remote and local

Showing 4 changed files with 68 additions and 16 deletions Side-by-side Diff

filesystem/file_read_time.c View file @ e65c4ba
... ... @@ -8,11 +8,10 @@
8 8 #include <stdlib.h>
9 9 #include <sys/time.h>
10 10 #define BLOCK_SIZE 512
  11 +
11 12 void main()
12 13 {
13   - char fname[20]="/mnt/file_";
14   - char *fno[] = {"1", "2", "3", "4", "5", "6", "7"};
15   - char *file;
  14 + char *fnames[] = {"file1", "file2", "file3", "file4", "file5", "file6", "file7"};
16 15 char buffer[BLOCK_SIZE] __attribute__ ((__aligned__ (512)));
17 16 struct timeval start, end;
18 17 int fd=0, count = 0;
19 18  
20 19  
... ... @@ -20,21 +19,15 @@
20 19 unsigned long long time;
21 20 int status;
22 21 for (i = 0; i < 7; i++) {
23   - count = 0;
24   - file = strcat(fname, fno[i]);
25   - printf("File %d: %s\n", i, file);
  22 + count = 0; //count number of blocks
  23 + printf("File %d: %s\n", i, fnames[i]);
26 24 fflush(NULL);
27   - //fd = open(file, O_RDONLY);
28   - fd = open(file, O_RDONLY | O_DIRECT | O_SYNC);
  25 + fd = open(fnames[i], O_RDONLY | O_DIRECT);
29 26 if (!fd) {
30 27 printf("unable to open\n");
31 28 exit(0);
32 29 }
33 30 posix_fadvise(fd, 0, 0, POSIX_FADV_RANDOM);
34   - // while(read(fd, buffer, BLOCK_SIZE)){
35   - // count++;
36   - // }
37   -// lseek(fd, 0, SEEK_SET);
38 31 printf("You are here\n");
39 32 gettimeofday(&start, NULL);
40 33 for (j = 0; j < 10; j++) {
... ... @@ -50,7 +43,6 @@
50 43 printf("timestamp %llu - %llu\n", end.tv_sec*1e6+end.tv_usec, start.tv_sec*1e6+start.tv_usec);
51 44 printf("time taken to read file # %d - %f\n", i, time/((float)count*10));
52 45  
53   -
54 46 sync();
55 47 status = system("sudo /sbin/sysctl vm.drop_caches=3");
56 48 sync();
57 49  
... ... @@ -67,9 +59,6 @@
67 59 sync();
68 60 status = system("sudo /sbin/sysctl vm.drop_caches=3");
69 61 sync();
70   - strcpy(fname, "/mnt/file_");
71 62 }
72   -
73   -
74 63 }
filesystem/file_read_time.o View file @ e65c4ba

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filesystem/file_read_time_remote.c View file @ e65c4ba
  1 +#define _GNU_SOURCE
  2 +#include <stdio.h>
  3 +
  4 +#include <sys/types.h>
  5 +#include <sys/stat.h>
  6 +#include <fcntl.h>
  7 +#include <string.h>
  8 +#include <stdlib.h>
  9 +#include <sys/time.h>
  10 +#define BLOCK_SIZE 512
  11 +
  12 +void main()
  13 +{
  14 + char *fnames[] = {"/mnt/file1", "/mnt/file2", "/mnt/file3", "/mnt/file4", "/mnt/file5", "/mnt/file6", "/mnt/file7"};
  15 + char buffer[BLOCK_SIZE] __attribute__ ((__aligned__ (512)));
  16 + struct timeval start, end;
  17 + int fd=0, count = 0;
  18 + int i, j;
  19 + unsigned long long time;
  20 + int status;
  21 + for (i = 0; i < 7; i++) {
  22 + count = 0; //count number of blocks
  23 + printf("File %d: %s\n", i, fnames[i]);
  24 + fflush(NULL);
  25 + fd = open(fnames[i], O_RDONLY | O_DIRECT);
  26 + if (!fd) {
  27 + printf("unable to open\n");
  28 + exit(0);
  29 + }
  30 + posix_fadvise(fd, 0, 0, POSIX_FADV_RANDOM);
  31 + printf("You are here\n");
  32 + gettimeofday(&start, NULL);
  33 + for (j = 0; j < 10; j++) {
  34 + count = 0;
  35 + while(BLOCK_SIZE == read(fd, buffer, BLOCK_SIZE)) {
  36 + count++;
  37 + }
  38 + lseek(fd, 0, SEEK_SET);
  39 + }
  40 + gettimeofday(&end, NULL);
  41 + printf("You are here2\n");
  42 + time = (end.tv_sec*1e6+end.tv_usec) - (start.tv_sec*1e6+start.tv_usec);
  43 + printf("timestamp %llu - %llu\n", end.tv_sec*1e6+end.tv_usec, start.tv_sec*1e6+start.tv_usec);
  44 + printf("time taken to read file # %d - %f\n", i, time/((float)count*10));
  45 +
  46 + sync();
  47 + status = system("sudo /sbin/sysctl vm.drop_caches=3");
  48 + sync();
  49 +
  50 + gettimeofday(&start, NULL);
  51 + for (j = 0; j < 1000; j++) {
  52 + pread(fd, buffer, BLOCK_SIZE, BLOCK_SIZE*(rand()%count));
  53 + }
  54 + gettimeofday(&end, NULL);
  55 + time = (end.tv_sec*1e6+end.tv_usec) - (start.tv_sec*1e6+start.tv_usec);
  56 + printf("timestamp %llu - %llu\n", end.tv_sec*1e6+end.tv_usec, start.tv_sec*1e6+start.tv_usec);
  57 + printf("time taken to read file # %d - %f\n", i, time/1000.0);
  58 +
  59 + sync();
  60 + status = system("sudo /sbin/sysctl vm.drop_caches=3");
  61 + sync();
  62 + }
  63 +}
filesystem/file_read_time_remote.o View file @ e65c4ba

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