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  1. #include <iostream>
  2. #include <sstream>
  3.  
  4. #ifdef __cplusplus
  5. extern "C" {
  6. #endif
  7.  
  8. typedef struct {
  9. 	long unsigned	tsc_low,
  10. 					tsc_high,
  11. 					tsc_low1,
  12. 					tsc_high1;
  13. } TscMeasurement;
  14.  
  15. #define rdtsc(low,high) \
  16.      __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
  17.  
  18. inline void tsc_start_measurement (TscMeasurement *tm) {
  19. 	rdtsc (tm->tsc_low, tm->tsc_high);
  20. }
  21.  
  22. inline void tsc_stop_measurement (TscMeasurement *tm) {
  23. 	rdtsc (tm->tsc_low1, tm->tsc_high1);
  24. }
  25.  
  26. inline long long unsigned tsc_get_ticks (const TscMeasurement *tm)
  27. {
  28. 	long long unsigned tsc, tsc1;
  29. 	tsc = (long long unsigned) tm->tsc_high << 32 |
  30. 		((long long unsigned) tm->tsc_low & 0xffffffff);
  31. 	tsc1 = (long long unsigned) tm->tsc_high1 << 32 |
  32. 		((long long unsigned) tm->tsc_low1 & 0xffffffff);
  33. 	return tsc1 - tsc;
  34. }
  35.  
  36. #ifdef __cplusplus
  37. }
  38. #endif
  39.  
  40. int main() {
  41. 		// your code goes here
  42. 	TscMeasurement ttime;
  43. 	volatile long long i;
  44. 	std::stringbuf::pos_type begin_pos(0);
  45. 	std::stringbuf buffer(std::ios_base::out);
  46. 	std::ostream os (&buffer);
  47.  
  48. 	tsc_start_measurement(&ttime);
  49. 	for(i=0; i < 10000000UL; i++) {
  50. 		buffer.pubseekpos(begin_pos, std::ios_base::out);
  51. 		os << i << "   " << "bla-bla-bla" << -10 << 1.3f << std::endl;
  52. 	}
  53. 	tsc_stop_measurement(&ttime);
  54.  
  55. 	printf ("Time: %llu\n", tsc_get_ticks(&ttime) );
  56.  
  57. 	return 0;
  58. }
Success #stdin #stdout 3.26s 16064KB
comments (?)
stdin 
Standard input is empty
stdout 
Time: 9785048702
https://ideone.com/tTrgcd
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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