[ImageJ-devel] [fiji-devel] slow opening of tif files using scifio-based ImgOpener

[Johannes Schindelin]

Hi Tobias,

On Thu, 7 Feb 2013, Tobias Pietzsch wrote:

> Ok, I tried the things you suggested as well as the setGroupFiles( false
> ) suggested by Lee.  Here are the results:
> 
> baseline (unmodified ImgOpener):
> loading 50 tif images using ImageJ, 10000 other tif files in same directory
> median: 141 ms
> loading 50 tif images using ImgOpener, 10000 other tif files in same directory
> median: 6953 ms
> 
> with setAllowOpenFiles( false ):
> loading 50 tif images using ImgOpener, 10000 other tif files in same directory
> median: 5972 ms
> 
> with setGroupFiles( false ):
> loading 50 tif images using ImgOpener, 10000 other tif files in same directory
> median: 2331 ms
> 
> with both,  setAllowOpenFiles( false ) and setGroupFiles( false ):
> loading 50 tif images using ImgOpener, 10000 other tif files in same directory
> median: 1070 ms
> 
> with TiffReader:
> loading 50 tif images using ImgOpener, 10000 other tif files in same directory
> median: 5061 ms
> 
> with TiffReader and setGroupFiles( false ):
> loading 50 tif images using ImgOpener, 10000 other tif files in same directory
> median: 568 ms
> 
> 
> 
> 
> For comparison, the case where there are no other files in the directory
> baseline (unmodified ImgOpener):
> loading 50 tif images using ImageJ, 0 other tif files in same directory
> median: 140 ms
> loading 50 tif images using ImgOpener, 0 other tif files in same directory
> median: 1804 ms
> 
> 
> with TiffReader and setGroupFiles( false ):
> loading 50 tif images using ImgOpener, 0 other tif files in same directory
> median: 552 ms
> 
> That's still 4x slower than ImageJ1 but already getting a lot closer. Nice!

Thanks for the detailed comparison. I will add code to perform these
timing tests more automatically and try to get at the root of the problem
as I indicated in a private conversation previously (using OProfile).

Ciao,
Dscho