Double elapsed time end stack overflow.
Wall clock time c stack overflow.
For example if you start a process at 01 59 00 on the day in which daylight savings summer time takes effect in a locale in which the time change is at 02 00 and the process takes two minutes then the real elapsed time will be two minutes while the wall clock will show a difference of.
The clock monotonic clock in particular is the best to use for this.
To get consistent results you have to work around cpu frequency scaling including intel turbo or the amd equivalent which lets your cpu clock higher when thermal power limits allow.
I m trying to measure some activity in c matrix multiplying and noticed that i should do something like this.
Telling time teaching clock kids room playroom décor analog silent wall clock.
Void start mytestfunc initialize the test star.
Clock t end clock.
Clock t start clock.
Real time is elapsed time which is usually the difference between wall clock times but not always.
Note that wall clock time isn t always a good way to time microbenchmarks.
If you want to know the wall clock execution time you need to use an appropriate function.
However as you ve said you re using posix that means you can use clock gettime defined in time h.
The only one in ansi c is time which typically only has 1 second resolution.