[Mapserver-users] mapscript and XBase cause Out of memory
errorand/or premature endof script headers error
Jonathan W. Lowe
jlowe at giswebsite.com
Fri Jan 3 17:21:50 EST 2003
Adding system("unlimit"); or system("ulimit"); to the script results in
the following error_log entries (respectively):
Can't exec "unlimit": No such file or directory at
/usr/home/gisweb/www/cgi-bin/ms_test5.cgi line 3.
gd-png: fatal libpng error: Out of Memory
gd-png error: setjmp returns error condition
Can't exec "ulimit": No such file or directory at
/usr/home/gisweb/www/cgi-bin/ms_test5.cgi line 3.
gd-png: fatal libpng error: Out of Memory
gd-png error: setjmp returns error condition
At a command prompt on the FreeBSD system, typing "unlimit" successfully
calls the builtin command. Likewise, also in the FreeBSD system,
opening "sh" and typing "ulimit" returns the text: "unlimited", also
successfully calling the builtin command.
But no luck when using the system call as part of a CGI-driven script.
Should I be forcing the perl script to run in another shell? (Not sure
how I'd do that.)
- Jonathan
On Fri, 2003-01-03 at 12:32, Lowell Filak wrote:
> I'm thinking as a quick test you could do:
> system("ulimit");
> or
> system("unlimit");
> and see if the script executes properly.
> Lowell
>
> The following message was sent by "Jonathan W. Lowe" <jlowe at giswebsite.com> on 03 Jan 2003 11:50:56 -0800.
>
> > Thanks, Lowell. New discoveries...
> >
> > The CGI module seems to be the problem.
> >
> > The following bare-bones script works perfectly when the "#use CGI;" is
> > commented out:
> >
> > #!/usr/bin/perl -w
> > use strict;
> > BEGIN { unshift(@INC, ('/usr/home/gisweb/local/lib',
> > '/usr/home/gisweb/local/lib/perl5/site_perl/5.005/i386-freebsd'));}
> > use mapscript;
> > use XBase;
> > use CGI;
> >
> > my $mapfilename = "/usr/home/gisweb/gis/proj/berk/b20.map";
> > my $image_path = '/usr/home/gisweb/www/docs/gis/scratch/';
> > my $image_virtual_path = '/gis/scratch/';
> > my $image_id = $$ . time() . ".png";
> >
> > my $map = new mapObj($mapfilename) or die('Unable to open mapfile.');
> > my $img = $map->draw() or die('Unable to draw map');
> > binmode STDOUT;
> > $img->saveImage($image_path .
> > $image_id,$mapscript::MS_PNG,$map->{transparent},$map->{interlace},95);
> > my $recnumb = 3;
> > my $table = new XBase '/usr/home/gisweb/gis/data/berk/wa_b.dbf'
> > or die XBase->errstr;
> > my @querydata = $table->get_record($recnumb);
> > my $block_result = $querydata[1];
> >
> > print "Content-type: text/html\n\n";
> > print "<html><body>\n";
> > print "XBase output:<br>\n";
> > print "$block_result!\n";
> > print "<p>Mapscript output:<br>\n";
> > print "<img src=\"$image_virtual_path";
> > print "$image_id\" border=\"1\">\n";
> > print "</body></html>\n"
> >
> > # --- End of ms_test5.cgi --- #
> >
> > But...when run with "use CGI;" uncommented, the image is corrupt and the
> > following message appears in the apache error_log:
> >
> > gd-png: fatal libpng error: Out of Memory
> > gd-png error: setjmp returns error condition
> >
> > When run in the command line (as "perl ms_test5.cgi"), the program also
> > runs perfectly.
> >
> > So, if the solution involves ulink/unlink, the shell builtin, how do I
> > take advantage of that builtin command if the program is running within
> > the apache/CGI environment?
> >
> > Thanks again for your help,
> >
> > Jonathan
> >
> > On Fri, 2003-01-03 at 06:10, Lowell Filak wrote:
> > > The only thing I can seem to locate right now is the shell built-in command ulimit/unlimit .
> > > Possibly the shell that the cgi is being run in needs unlimit set.?
> > > All this is assuming that when you receive the out-of-memory error your watching top and can clearly see that there is plenty of memory left.?
> > > HTH
> > > Lowell F.
> > >
> > > The following message was sent by "Jonathan W. Lowe" <jlowe at giswebsite.com> on 02 Jan 2003 16:34:07 -0800.
> > >
> > > > List:
> > > >
> > > > Perl mapscript in combination with the perl XBase and CGI modules works
> > > > very well in my Redhat 8 development environment, but when moving the
> > > > code to the production FreeBSD environment, the following problem
> > > > results:
> > > >
> > > > A program containing the statements...
> > > >
> > > > use mapscript;
> > > > use XBase;
> > > >
> > > > ...runs the mapscript portions correctly when just the "use XBase;" line
> > > > is commented out.
> > > >
> > > > The same program runs the XBase portions correctly when just the "use
> > > > mapscript;" line is commented out.
> > > >
> > > > The line causing problems when both modules are running contains the
> > > > following perl mapscript command:
> > > >
> > > > my $img = $map->draw() or die('Unable to draw map');
> > > >
> > > > The resulting line in the apache error_log reads:
> > > >
> > > > Out of memory!
> > > > [Thu Jan 2 16:09:25 2003] [error] Premature end of script
> > > > headers...etc
> > > >
> > > > The only posting referring to "Out of memory" in this context refers to
> > > > SWIG and is a couple of years old.
> > > >
> > > > Any ideas for resolving this problem?
> > > >
> > > > Regards,
> > > > Jonathan W. Lowe
> > > >
> > > > _______________________________________________
> > > > Mapserver-users mailing list
> > > > Mapserver-users at lists.gis.umn.edu
> > > > http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> > >
> > >
> >
> >
> > _______________________________________________
> > Mapserver-users mailing list
> > Mapserver-users at lists.gis.umn.edu
> > http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
>
>
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