[
https://issues.apache.org/jira/browse/IMAGING-356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17739148#comment-17739148
]
Gary Lucas commented on IMAGING-356:
------------------------------------
In response to the comment "You should bisect to the offending change", I don't
think that's really my responsibility. I'm not the one who made the code
change that degraded performance. Even so, I did try to narrow down the
issue and identify a test procedure that would help address the problem.
We all make mistakes. I am hoping that, once alerted to the issue, whoever is
working in this area will recognize his or her mistake and find it relatively
easy to make a fix.
> 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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
