清空筛选条件
清空筛选条件

How can I solve memory leak in fft?

8 次查看（过去 30 天）
Shmuel
Shmuel 2013-1-28
评论： Noah Prisament 2023-6-7
When using fft function many times with different input size it causes memory leak (as seen in the physical memory).
For example, the following matlab code :
for i=1:1000, y=fft([1:i*1000]); end
MATLAB Version: 7.14.0.739 (R2012a)
How can I solve it?

请先登录，再回答此问题。

回答（1 个）

Steve Eddins
Steve Eddins 2013-1-28
It is not an actual memory leak. MATLAB does cache (save for reuse) tables of trigonometric values for use in subsequent calls to FFT with vectors of the same length. (There is a significant performance benefit in doing so.) However, this cache does have a finite size; it will not continue to grow indefinitely.
  4 个评论
显示 2更早的评论
John D'Errico
John D'Errico 2014-12-9
编辑：John D'Errico 2014-12-9
This would suggest the value of a 'nocache' option in fft.
Noah Prisament
Noah Prisament 2023-6-7
To clear this cache, you can utilize the "fftw" command which is used to modify the settings and behavior of the "fft" function. You can execute the following commands in your scripts or in the command window to clear the cache:
fftw('swisdom', []);
fftw('dwisdom', []);
These will clear the single precision and the double precision caches respectively. Another important command to minimize the memory usage of the "fft" function is:
fftw('planner','estimate');
as the other planner options employ more memory in order to improve their precision. More information on the "fftw" command can be found here.
These uses of "fftw" should help with limiting the size of the cache and releasing it periodically.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Performance and Memory 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by