Bug 689896 - Very slow performance reading PDF file
Summary: Very slow performance reading PDF file
Status: NOTIFIED FIXED
Alias: None
Product: Ghostscript
Classification: Unclassified
Component: PDF Interpreter (show other bugs)
Version: master
Hardware: PC Linux
: P1 normal
Assignee: Alex Cherepanov
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2008-06-14 14:16 UTC by Marcos H. Woehrmann
Modified: 2008-12-19 08:31 UTC (History)
0 users

See Also:
Customer: 531
Word Size: ---

Attachments
patch (819 bytes, patch)
2008-07-15 06:25 UTC, Alex Cherepanov 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

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Description Marcos H. Woehrmann 2008-06-14 14:16:50 UTC 
The attached PDF file takes Ghostscript a very long time to process, even at low
DPI values (i.e. 42 minutes at 40 DPI).  Adobe Acrobat opens and renders the
file quickly.

The customer reported this with gs8.62, but I've duplicated it was gs8.54 and
head (r8795).

The command line I'm using for testing:

  bin/gs -r40 -sDEVICE=ppmraw -o test.ppm ./ventura_ll_rcp_june_5th_2008.pdf
Comment 1 Marcos H. Woehrmann 2008-06-14 14:17:16 UTC 
Created attachment 4097 [details]
ventura_ll_rcp_june_5th_2008.pdf
Comment 2 Alex Cherepanov 2008-07-15 06:25:40 UTC 
Created attachment 4222 [details]
patch

Cache the pattern instance in the PDF pattern object to prevent reprated
pattern instantiation and improve performance.

This file has one more issue. The appearance of small pattern cells, used
by the file to show color tints, depend on their placement relatively to
the device pixels. Use sufficient resolution to see all patterns. -r40 is
too small.
Comment 3 Alex Cherepanov 2008-07-15 06:29:24 UTC 
The patch is committed as a rev. 8842.
Regression testing shows no differences.