I am trying to convert a PDF to a JPG preview, but certain PDF files are taking a really long time to process on our RH Linux server (+- 35 seconds). The same file & command on my Windows 8 development machine takes only 3 seconds. I am using GraphicsMagick 1.3.18 & GhostScript 8.70-19. I get the same results using ImageMagick. Unfortunately I can't share the PDF file in question, but here are its properties (it is only 399KB compressed & 1.1MB uncompressed):
I tested using a compressed & uncompressed version, and the results are similar. I found that both the gm convert file.pdf output.jpg and gm identify file.pdf commands take a long time.
This is the output of gm identify -version on the Linux server:
GraphicsMagick 1.3.18 2013-03-10 Q8 http://www.GraphicsMagick.org/
Copyright (C) 2002-2013 GraphicsMagick Group.
Additional copyrights and licenses apply to this software.
See http://www.GraphicsMagick.org/www/Copyright.html for details.
Feature Support:
Thread Safe yes
Large Files (> 32 bit) yes
Large Memory (> 32 bit) yes
BZIP yes
DPS no
FlashPix no
FreeType yes
Ghostscript (Library) no
JBIG no
JPEG-2000 yes
JPEG yes
Little CMS yes
Loadable Modules yes
OpenMP yes (200805)
PNG yes
TIFF yes
TRIO no
UMEM no
WMF yes
X11 yes
XML yes
ZLIB yes
Host type: x86_64-redhat-linux-gnu
Configured using the command:
./configure '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--enable-shared' '--disable-static' '--with-lcms' '--with-magick_plus_plus' '--with-modules' '--with-perl' '--with-perl-options=INSTALLDIRS=vendor ' '--with-threads' '--with-wmf' '--with-x' '--with-xml' '--without-dps' '--without-gslib' '--with-gs-font-dir=/usr/share/fonts/default/Type1' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'target_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' 'CXXFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=
Final Build Parameters:
CC = gcc -std=gnu99
CFLAGS = -fopenmp -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wall -pthread
CPPFLAGS = -I/usr/include/freetype2 -I/usr/include/libxml2
CXX = g++
CXXFLAGS = -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -pthread
LDFLAGS = -L/usr/lib -L/usr/lib
LIBS = -llcms -lfreetype -lXext -lSM -lICE -lX11 -lbz2 -lz -lltdl -lm -lgomp -lpthread
I only have this problem for some PDF files, most are processed using the same command quite quickly.
Any ideas regarding what might make this take so long?
