Question about multi-threading and segments about transform360

[EthanXzhang]

I have calculated the PSNR of the enable/disable Mutli-threading, the output frame with the Ref of the source Frame(ERP to CUBE to ERP) have the same PSNR. It means that Mutli-Threading is non-increasing in the quality of the low-pass filter.
But, why it slow down the speed?

[ethanjyx]

Hi @EthanXzhang , what were the commands that you used for enabling and disabling multi-threading?

[EthanXzhang]

@ethanjyx Refer to the README, commands like"... :enable_low_pass_filter=1 :enable_multi_threading=1 :num_horizontal_segments=2 :num_vertical_segments=1..."
I have figure out this question. The number of threads has a threshold. 2K Frame have a low threshold. When the number of segment reached the threshold(under 10), the speed begins to become less obvious or reduce. In 4K Frame, MT Low-pass Filter have a good performance.
Sorry to report it late.
Thanks a lot.