time-measurement

How to measure the time that a piece of code takes to execute?

由 ☆樱花仙子☆ 提交于 2019-11-27 18:22:14
问题 Suppose I want to measure the time that a certain piece of code takes. For that I would normally do something like this clock_t startTime = clock(); //do stuff //do stuff //do stuff //do stuff float secsElapsed = (float)(clock() - startTime)/CLOCKS_PER_SEC; What if the program is multithreaded and context switches occur within the part which I want to measure? How would I measure the time that my code takes to execute excluding time spent on other threads? Even if there are tools that do it,

Python speed testing - Time Difference - milliseconds

由 ▼魔方 西西 提交于 2019-11-26 23:42:08
What is the proper way to compare 2 times in Python in order to speed test a section of code? I tried reading the API docs. I'm not sure I understand the timedelta thing. So far I have this code: from datetime import datetime tstart = datetime.now() print t1 # code to speed test tend = datetime.now() print t2 # what am I missing? # I'd like to print the time diff here NickZoic datetime.timedelta is just the difference between two datetimes ... so it's like a period of time, in days / seconds / microseconds >>> a = datetime.datetime.now() >>> b = datetime.datetime.now() >>> c = b - a >>> c

How to measure program execution time in ARM Cortex-A8 processor?

由 冷暖自知 提交于 2019-11-26 14:07:17
I'm using an ARM Cortex-A8 based processor called as i.MX515. There is linux Ubuntu 9.10 distribution. I'm running a very big application written in C and I'm making use of gettimeofday(); functions to measure the time my application takes. main() { gettimeofday(start); .... .... .... gettimeofday(end); } This method was sufficient to look at what blocks of my application was taking what amount of time. But, now that, I'm trying to optimize my code very throughly, with the gettimeofday() method of calculating time, I see a lot of fluctuation between successive runs (Run before and after my

Python speed testing - Time Difference - milliseconds

由 不打扰是莪最后的温柔 提交于 2019-11-26 08:45:58
问题 What is the proper way to compare 2 times in Python in order to speed test a section of code? I tried reading the API docs. I\'m not sure I understand the timedelta thing. So far I have this code: from datetime import datetime tstart = datetime.now() print t1 # code to speed test tend = datetime.now() print t2 # what am I missing? # I\'d like to print the time diff here 回答1: datetime.timedelta is just the difference between two datetimes ... so it's like a period of time, in days / seconds /

How to measure program execution time in ARM Cortex-A8 processor?

由 送分小仙女□ 提交于 2019-11-26 05:55:18
问题 I\'m using an ARM Cortex-A8 based processor called as i.MX515. There is linux Ubuntu 9.10 distribution. I\'m running a very big application written in C and I\'m making use of gettimeofday(); functions to measure the time my application takes. main() { gettimeofday(start); .... .... .... gettimeofday(end); } This method was sufficient to look at what blocks of my application was taking what amount of time. But, now that, I\'m trying to optimize my code very throughly, with the gettimeofday()
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