Modern Chrono CpuClock ProcessTime

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CpuClock.ProcessTime

Returns the processor time this process has used so far, user and kernel together.

Syntax

CpuClock.ProcessTime( ) as TimeSpan

Notes

• A sleep does not advance it: it counts processor time used, not time passed. That is what makes it the right measure of how much work code does, and the wrong one for how long a user waits.
• Counts every thread of the process.
• Invalid when the platform cannot report it -- see IsSupported.
• It advances in the OS's accounting steps, which on Windows are often 15.625 ms, so measure work that takes well over that.

Examples

#import "std/chrono"
using chrono

dim as TimeSpan t0 = CpuClock.ProcessTime( )

dim as float64 x = 0
for i as int32 = 1 to 30000000 : x += sqr( i ) : next
dim as TimeSpan t1 = CpuClock.ProcessTime( )
print ( t1 - t0 ).TotalMilliseconds > 0     '' -1 (true) -- the loop used the processor

'' Sleeping uses none
sleep 200, 1
print ( CpuClock.ProcessTime( ) - t1 ).TotalMilliseconds < 50   '' -1 (true)

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Library: Chrono Date and Time
Category: Date and Time (Chrono)
Documented under: The Members