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https://issues.apache.org/jira/browse/IMAGING-356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17739371#comment-17739371
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Gary Lucas commented on IMAGING-356:
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No luck. Same runtime as before... Though the change did reduce the memory
use quite a bit.
First, to confirm that I tested the right thing... You pushed your changes
directly to the master branch? That's where I downloaded code and I did see
the commit comment saying "Delegate size". I also stepped through the code just
to be sure that a change was in effect. The change I saw looks much more
reasonable than the previous approach.
Did you try running the ApacheImagingSpeedAndMemoryTest? I wrote it back when
I was trying to optimize the speed of the imaging classes (the old Sanselan
classes). I tried a lot of different ideas before I got things running at a
reasonable speed. It was very helpful. For this test, I tried processing the
file called PICT2833.TIF which is included in the project distribution as part
of a suite of test files.
Gary
P.S. On an separate issue, have you been seeing complaints about encoding
errors in the Allocator class? I am seeing invalid UTF-8 characters in the
Javadoc comments on lines 144 and 165.
> TIFF reading extremely slow in version 1.0-SNAPSHOT
> ---------------------------------------------------
>
> Key: IMAGING-356
> URL: https://issues.apache.org/jira/browse/IMAGING-356
> Project: Commons Imaging
> Issue Type: Bug
> Components: Format: TIFF
> Affects Versions: 1.0
> Reporter: Gary Lucas
> Priority: Major
>
> I am using the latest code from github (1.0-SNAPSHOT downloaded from github
> of June 2023) to read a 300 megabyte TIFF file. Version 1.0-alpha3 required
> 673 milliseconds to read that file. The new code requires upward of 15
> minutes. Clearly something got broken since the last release.
> The TIFF file is a 10000x10000 pixel 4 byte image format organized in strips.
> The bottleneck appears to occur in the TiffReader getTiffRawImageData method
> which reads raw data from the file in preparation of creating a BufferedImage
> object.
> I suspect that there may be a general slowness of file access. In debugging,
> even reading the initial metadata (22 TIFF tags) took a couple of seconds.
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