- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi. I have a problem, I am trying to use the "Performance Counter" for general time measurements. In the documentation there is an example how to use it, so I have used it as a base for my tests. However, I don't get the results I expected. For example, the line C-code "i=3;" takes 104 clock ticks to execute?!
My code: # include <stdio.h> //For the performance counter # include "altera_avalon_performance_counter.h"# include "system.h" # define FUNCTION_SECTION_1 1# define FUNCTION_SECTION_2 2 void function_1 (void) { int i=0; //PERF_COUNTER_0_BASE is defined in system.h PERF_BEGIN (PERFORMANCE_COUNTER_0_BASE, FUNCTION_SECTION_1); i=3; //First Object to measure PERF_END (PERFORMANCE_COUNTER_0_BASE, FUNCTION_SECTION_1); } void function_2 (void) { int i=0; //PERF_COUNTER_0_BASE is defined in system.h PERF_BEGIN (PERFORMANCE_COUNTER_0_BASE, FUNCTION_SECTION_2); i=3; //Objects to measure i=4; PERF_END (PERFORMANCE_COUNTER_0_BASE, FUNCTION_SECTION_2); } //Turn measurement on & off int main() { // Reset the counters before every run PERF_RESET (PERFORMANCE_COUNTER_0_BASE); // Now our program starts in earnest. Begin measuring: PERF_START_MEASURING (PERFORMANCE_COUNTER_0_BASE); function_1(); function_2(); PERF_STOP_MEASURING (PERFORMANCE_COUNTER_0_BASE); //Print the result using "perf_print_formatted_report" perf_print_formatted_report (PERFORMANCE_COUNTER_0_BASE, ALT_CPU_FREQ, // defined in "system.h" 2, // How many sections to print "function 1", "function 2"); // Display-name of section(s). return 0; } From this code I get the following results: --Performance Counter Report-- Total Time: 1.64167E-05 seconds (788 clock-cycles) +---------------+-----+-----------+---------------+-----------+ | Section | % | Time (sec)| Time (clocks)|Occurrences| +---------------+-----+-----------+---------------+-----------+ |function 1 | 13.2| 0.00000| 104| 1| +---------------+-----+-----------+---------------+-----------+ |function 2 | 19.3| 0.00000| 152| 1| +---------------+-----+-----------+---------------+-----------+ What does it means? What have I done wrong? /DavidLink Copied
0 Replies
Reply
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page