>Psychtoolbox>PsychBasic

ticks = GetBusTicks

OS X: ___________________________________________________________________

Return the number of system bus ticks since startup. The period of the
bus tick clock depends on the model and frequency of your CPU. Use
GetSecs instead for reliable, high-precision time measurement in standard
units.

Bus ticks returned by GetBusTicks are not the same as ticks returned by
GetTicks. The GetBusTicks clock is fast and precise, derived directly
from the CPU clock and typically faster than 1/10 of its speed. On
Allen’s 1GHz G4 the GetBusTicks clock is 133 MHz.

The GetTicks clock is slow, always 1/60.15 seconds. On OS
X GetTicks is obsolete and provided only for compatibility with older
scripts.

TIMING ADVICE: the first time you access any MEX function or M file,
Matlab takes several hundred milliseconds to load it from disk.
Allocating a variable takes time too. Usually you’ll want to omit those
delays from your timing measurements by making sure all the functions you
use are loaded and that all the variables you use are allocated, before
you start timing. MEX files stay loaded until you flush the MEX files
(e.g. by changing directory or calling CLEAR MEX). M files and variables
stay in memory until you clear them.

OS 9: ___________________________________________________________________

GetBusTicks does not exist in OS 9.

WINDOWS: ________________________________________________________________

GetBusTicks does not exist in Windows.

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See also: GetBusTicksTick, GetSecs, GetSecsTick, GetTicks, GetTicksTick.