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gputimeit

Time required to run function on GPU

Syntax

t = gputimeit(F)
t = gputimeit(F,N)

Description

t = gputimeit(F)measures the typical time (in seconds) required to run the function specified by the function handleF. The function handle accepts no external input arguments, but can be defined with input arguments to its internal function call.

t = gputimeit(F,N)callsFto returnNoutput arguments. By default,gputimeitcalls the functionFwith one output argument, or no output arguments ifFdoes not return any output.

Examples

Measure the time to calculatesum(A.' .* B, 1)on a GPU, whereAis a 12000-by-400 matrix andBis 400-by-12000.

A = rand(12000,400,'gpuArray'); B = rand(400,12000,'gpuArray'); f = @() sum(A.' .* B, 1); t = gputimeit(f)
0.0026

Compare the time to runsvdon a GPU, with one versus three output arguments.

X = rand(1000,'gpuArray'); f = @() svd(X); t3 = gputimeit(f,3)
1.0622
t1 = gputimeit(f,1)
0.2933

Tips

gputimeitis preferable totimeitfor functions that use the GPU, because it ensures that all operations on the GPU have finished before recording the time and compensates for the overhead. For operations that do not use a GPU,timeitoffers greater precision.

Note the following limitations:

  • The functionFshould not callticortoc.

  • You cannot useticandtocto measure the execution time ofgputimeititself.

See Also

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Introduced in R2013b

Parallel Computing Toolbox Documentation

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