[fpc-pascal] Sub-millisecond time measuring

[Michael Van Canneyt]

On Sat, 29 Jun 2024, Hairy Pixels via fpc-pascal wrote:

>
>
>> On Jun 29, 2024, at 5:43 PM, Adriaan van Os <adriaan at adriaan.biz> wrote:
>> 
>> Hairy Pixels via fpc-pascal wrote:
>>> I had a large function which I was profiling with MilliSecondsBetween but I split it to be called many different times and now it's not accumulating the total time correctly because time is being lost to due millisecond precision.
>>> Is there anything in the RTL I can use which is more accurate? I searched and couldn't find anything.
>> 
>> You can use Microseconds on MacOS, QueryPerformanceFrequency on Windows and g_get_monotonic_time with gtk on Linux.
>> 
>> Regards,
>> 
>> Adriaan van Os
>> 
>
> Is that a function in the RTL? I can't find it.

No, these are platform-specific functions.

g_get_monotonic_time is probably just an alias for the linux/freebsd unit functions 
clock_gettime(CLOCK_MONOTONIC_RAW).

QueryPerformanceFrequency you will probably find in the Windows unit.

Microseconds can be found in the Timer unit (part of univint package)

Michael.