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         {
  38                 fprintf(stderr,"Couldn't open /dev/mga_vid\n");
  39                 return -1;
  40         }
  41
  42         mga_vid_config.num_frames=1;
  43         mga_vid_config.frame_size=ARR_SIZE;
  44         mga_vid_config.format=MGA_VID_FORMAT_YUY2;
  45
  46         mga_vid_config.colkey_on=0;
  47         mga_vid_config.src_width = 640;
  48         mga_vid_config.src_height= 480;
  49         mga_vid_config.dest_width = 320;
  50         mga_vid_config.dest_height= 200;
  51         mga_vid_config.x_org= 0;
  52         mga_vid_config.y_org= 0;
  53
  54         mga_vid_config.version=MGA_VID_VERSION;
  55         if (ioctl(f,MGA_VID_CONFIG,&mga_vid_config))
  56         {
  57                 perror("Error in mga_vid_config ioctl()");
  58                 printf("Your mga_vid driver version is incompatible with this MPlayer version!\n");
  59                 exit(1);
  60         }
  61         ioctl(f,MGA_VID_ON,0);
  62
  63         frame = (char*)mmap(0,mga_vid_config.frame_size*mga_vid_config.num_frames,PROT_WRITE,MAP_SHARED,f,0);
  64         if(!frame){
  65           printf("Can't mmap mga frame\n");
  66           exit(1);
  67         }
  68
  69         //clear the buffer
  70         //memset(frames[0],0x80,mga_vid_config.frame_size*mga_vid_config.num_frames);
  71
  72   return 0;
  73
  74 }
  75
  76 #endif
  77
  78 // Returns current time in microseconds
  79 static unsigned int GetTimer(void)
  80 {
  81   struct timeval tv;
  82   struct timezone tz;
  83 //  float s;
  84   gettimeofday(&tv,&tz);
  85 //  s=tv.tv_usec;s*=0.000001;s+=tv.tv_sec;
  86   return tv.tv_sec * 1000000 + tv.tv_usec;
  87 }
  88
  89 static inline unsigned long long int read_tsc( void )
  90 {
  91   unsigned long long int retval;
  92   __asm__ volatile ("rdtsc":"=A"(retval)::"memory");
  93   return retval;
  94 }
  95
  96 unsigned char  __attribute__((aligned(4096)))arr1[ARR_SIZE],arr2[ARR_SIZE];
  97
  98 int main( void )
  99 {
 100   unsigned long long int v1,v2;
 101   unsigned char * marr1,*marr2;
 102   int i;
 103   unsigned int t;
 104 #ifdef CONFIG_MGA
 105   mga_init();
 106   marr1 = &frame[3];
 107 #else
 108   marr1 = &arr1[3];
 109 #endif
 110   marr2 = &arr2[9];
 111
 112   for(i=0; i<ARR_SIZE-16; i++) marr1[i] = marr2[i] = i;
 113
 114   t=GetTimer();
 115   v1 = read_tsc();
 116   for(i=0;i<100;i++) 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,100000000.0f/(float)t,(float)ARR_SIZE*95.36743f/(float)t);
 121   return 0;
 122 }