cuFFT 1-D size limit

Accelerated Computing CUDA CUDA Programming and Performance
1

The cuFFT manual states that 1-D ffts are supported for < 8 million elements.

  1. When doing batched ffts does this limit apply to the total size or to the size of a single fft?

  2. I’ve been able to compute ffts for sizes larger than 8 million elements, working on a Tesla C1060 I’ve been able to use cuFFT to compute ffts for up to 67 million pts with good accuracy and no error codes from any cuFFT functions. Is the manual still correct in regards to this limit?

thanks!
-Justin

2

In the 3.1 release notes it states:

  • If the (batch size * transform size * datatype size) exceeds

    512MB in a 1D transform, CUFFT kernels fail to launch.

Does this describe a different failure? or perhaps that the published limit has in fact been changed?

3

In the 3.1 release notes it states:

  • If the (batch size * transform size * datatype size) exceeds

    512MB in a 1D transform, CUFFT kernels fail to launch.

Does this describe a different failure? or perhaps that the published limit has in fact been changed?