1D CUFFT limit puzzle

[zw.han]

Recently,I am testing the cufft library.

As the reference book says that the limit of the 1D transform of CUFFT is 8 million elements.

But when I tried to transform 30 million elements,I can also get the right result (compared with computing by matlab and FFTW3).The only problem is a “CUFFT_INVALID_PLAN” error.At this circumstance,the speedup is about 28 times.

When I divide the data into 6 batchs ,I can compute them without warnings ,but the time speedup is only 7 times.

So can I compute the data of 30 million elements in a batch?

Thanks for you help!

[E.D_Riedijk]

Recently,I am testing the cufft library.

As the reference book says that the limit of the 1D transform of CUFFT is 8 million elements.

But when I tried to transform 30 million elements,I can also get the right result (compared with computing by matlab and FFTW3).The only problem is a “CUFFT_INVALID_PLAN” error.At this circumstance,the speedup is about 28 times.

When I divide the data into 6 batchs ,I can compute them without warnings ,but the time speedup is only 7 times.

So can I compute the data of 30 million elements in a batch?

Thanks for you help!

Really, there is no need to shout.

No you cannot is the answer. CUFFT_INVALID_PLAN means that an error is produced.