Mailinglist Archive: opensuse (1468 mails)

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Re: [opensuse] Ghostscript (PS->PDF) Terrible Performance Under 11.1 Compared To 10.3
  • From: "Dr. Werner Fink" <werner@xxxxxxx>
  • Date: Wed, 3 Jun 2009 12:41:05 +0200
  • Message-id: <20090603104105.GA2312@xxxxxxxxxxxxx>
On Tue, Jun 02, 2009 at 04:24:12PM -0400, Adam Tauno Williams wrote:
We use openSUSE for our Intranet web servers, which frequently convert
documents to PDF using a2ps/ps2pdf. Under openSUSE 10.3 (GS 8.15.4-3.2)
this process is very fast. Unfortunately after upgrading to openSUSE
11.1 (GS 8.62-31.43.1) we find the process to be excruciatingly slow.
With just a 135KB PDF, containing no images, we see times like:

openSUSE 10.3: real 0m1.5s user 0m0.4s sys 0m1.1s
openSUSE 11.1: real 0m5.2s user 0m1.6s sys 0m3.6s

so that is quite a bit slower proportionally. But run a 632 page
postscript file (again, no images) and...

openSUSE 10.3: real 0m4.680s user 0m3.912s sys 0m0.768s
openSUSE 11.1: effectively never finishes

This is the time for running the following command:
/usr/bin/gs -dSAFER -dCompatibilityLevel=1.2 -q -dNOPAUSE -dBATCH
-sDEVICE=pdfwrite -sOutputFile=file.pdf -dSAFER -c .setpdfwrite -f file.ps

openSUSE 10.3:
ghostscript-fonts-std-8.15.4-3.2
ghostscript-library-8.15.4-3.2
openSUSE 11.1
ghostscript-library-8.62-31.43.1.i586
ghostscript-fonts-std-8.62-31.43.1.i586
ghostscript-x11-8.62-31.43.1.i586
ghostscript-fonts-other-8.62-31.43.1.i586
ghostscript-omni-8.62-31.43.1.i586

I've tried removing ghostscript-omni to no effect. I've watched with
"strace -c" and it doesn't appear to be spending all it's time in system
calls, so it is Ghostscript itself. During the run time the gs process
pegs the CPU.

Any suggestions would be very appreciated.

The version 8.62 has an completly rewritten pdfwrite API which is much
more compatible with the PDF standard. Beside this it can handle much
more PostScript code fid out there. This cause the longer compilation
time. This has nothing todo with omni o r any other device interface,
it is simply the device pdfwrite its self.

Beside this check if you're uptodate with ghostscript as there was
some fixes not only security fixes. Last changelog entry is

Wed May 13 17:26:49 CEST 2009 - werner@xxxxxxx
- Complete patch for CVE-2009-0792 (bnc#491897)


if this version hangs on your file you may use

strace -p `pidof gs`

to see what happens here.


Werner

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"Having a smoking section in a restaurant is like having
a peeing section in a swimming pool." -- Edward Burr
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