TOOLS/fastmemcpybench.c

   1 /*
   2    fastmemcpybench.c used to benchmark fastmemcpy.h code from libvo.
   3
   4    Note: this code can not be used on PentMMX-PII because they contain
   5    a bug in rdtsc. For Intel processors since P6(PII) rdpmc should be used
   6    instead. For PIII it's disputable and seems bug was fixed but I don't
   7    tested it.
   8 */
   9
  10 /* According to Uoti this code is broken. */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <sys/ioctl.h>
  16 #include <unistd.h>
  17 #include <fcntl.h>
  18 #include <sys/mman.h>
  19 #include <sys/time.h>
  20 #include <inttypes.h>
  21
  22 //#define ARR_SIZE 100000
  23 #define ARR_SIZE (1024*768*2)
  24
  25 #ifdef CONFIG_MGA
  26
  27 #include "drivers/mga_vid.h"
  28
  29 static mga_vid_config_t mga_vid_config;
  30 static unsigned char* frame = NULL;
  31 static int f;
  32
  33 static int mga_init(void)
  34 {
  35     f = open("/dev/mga_vid", O_RDWR);
  36     if (f == -1) {
  37         fprintf(stderr, "Couldn't open /dev/mga_vid\n");
  38         return -1;
  39     }
  40
  41     mga_vid_config.num_frames = 1;
  42     mga_vid_config.frame_size = ARR_SIZE;
  43     mga_vid_config.format     = MGA_VID_FORMAT_YUY2;
  44
  45     mga_vid_config.colkey_on   =   0;
  46     mga_vid_config.src_width   = 640;
  47     mga_vid_config.src_height  = 480;
  48     mga_vid_config.dest_width  = 320;
  49     mga_vid_config.dest_height = 200;
  50     mga_vid_config.x_org       =   0;
  51     mga_vid_config.y_org       =   0;
  52
  53     mga_vid_config.version     = MGA_VID_VERSION;
  54     if (ioctl(f, MGA_VID_CONFIG, &mga_vid_config)) {
  55         perror("Error in mga_vid_config ioctl()");
  56         printf("Your mga_vid driver version is incompatible with this MPlayer version!\n");
  57         exit(1);
  58     }
  59     ioctl(f, MGA_VID_ON, 0);
  60
  61     frame = (char*)mmap(0, mga_vid_config.frame_size*mga_vid_config.num_frames,
  62                         PROT_WRITE,MAP_SHARED, f, 0);
  63     if (!frame) {
  64         printf("Can't mmap mga frame\n");
  65         exit(1);
  66     }
  67
  68     //clear the buffer
  69     //memset(frames[0], 0x80, mga_vid_config.frame_size*mga_vid_config.num_frames);
  70
  71     return 0;
  72 }
  73
  74 #endif
  75
  76 // Returns current time in microseconds
  77 static unsigned int GetTimer(void)
  78 {
  79     struct timeval tv;
  80     struct timezone tz;
  81     //float s;
  82     gettimeofday(&tv, &tz);
  83     //s = tv.tv_usec; s *= 0.000001; s += tv.tv_sec;
  84     return tv.tv_sec * 1000000 + tv.tv_usec;
  85 }
  86
  87 static inline unsigned long long int read_tsc(void)
  88 {
  89     unsigned long long int retval;
  90     __asm__ volatile ("rdtsc":"=A" (retval)::"memory");
  91     return retval;
  92 }
  93
  94 unsigned char __attribute__((aligned(4096)))arr1[ARR_SIZE], arr2[ARR_SIZE];
  95
  96 int main(void)
  97 {
  98     unsigned long long int v1, v2;
  99     unsigned char *marr1, *marr2;
 100     int i;
 101     unsigned int t;
 102 #ifdef CONFIG_MGA
 103     mga_init();
 104     marr1 = &frame[3];
 105 #else
 106     marr1 = &arr1[0];
 107 #endif
 108     marr2 = &arr2[0];
 109
 110     for (i = 0; i < ARR_SIZE - 16; i++)
 111         marr1[i] = marr2[i] = i;
 112
 113     t  = GetTimer();
 114     v1 = read_tsc();
 115     for (i = 0; i < 100; i++)
 116         memcpy(marr1, marr2, ARR_SIZE - 16);
 117     v2 = read_tsc();
 118     t  = GetTimer() - t;
 119     // ARR_SIZE*100 / (1024*1024) / (t/1000000) = ARR_SIZE*95.36743 / t
 120     printf(NAME ": cpu clocks=%llu = %dus  (%5.3ffps)  %5.1fMB/s\n", v2-v1, t,
 121            100000000.0f/(float)t, (float)ARR_SIZE*95.36743f/(float)t);
 122     return 0;
 123 }