Index: tilesGen.pl
===================================================================
--- tilesGen.pl	(revision 9419)
+++ tilesGen.pl	(working copy)
@@ -36,6 +36,7 @@
 use English '-no_match_vars';
 use GD qw(:DEFAULT :cmp);
 use AppConfig qw(:argcount);
+use POSIX;
 
 #---------------------------------
 
@@ -71,6 +72,14 @@
 
 my $Layers = $Config->get("Layers");
 
+# Be nice. Reduce program priority
+if ($Config->get("Niceness")) {
+    my $success=POSIX::nice($Config->get("Niceness"));
+    if ($success==undef) {
+        printf STDERR "WARNING: Unable to apply Niceness. Will run at normal priority";
+    }
+}
+
 # Get version number from version-control system, as integer
 my $Version = '$Revision$';
 $Version =~ s/\$Revision:\s*(\d+)\s*\$/$1/;
@@ -1038,16 +1047,14 @@
             {
                 # Pre-process the data file using maplint
                 # TODO may put this into a subroutine of its own
-                my $Cmd = sprintf("%s \"%s\" tr %s %s > \"%s\"",
-                        $Config->get("Niceness"),
+                my $Cmd = sprintf("\"%s\" tr %s %s > \"%s\"",
                         $Config->get("XmlStarlet"),
                         "maplint/lib/run-tests.xsl",
                         "$inputFile",
                         "tmp.$PID");
                 statusMessage("Running maplint", $currentSubTask, $progressJobs, $progressPercent,0);
                 runCommand($Cmd,$PID);
-                $Cmd = sprintf("%s \"%s\" tr %s %s > \"%s\"",
-                        $Config->get("Niceness"),
+                $Cmd = sprintf("\"%s\" tr %s %s > \"%s\"",
                         $Config->get("XmlStarlet"),
                         "maplint/lib/convert-to-tags.xsl",
                         "tmp.$PID",
@@ -1058,8 +1065,7 @@
             }
             elsif ($preprocessor eq "close-areas")
             {
-                my $Cmd = sprintf("%s perl close-areas.pl $X $Y $Zoom < %s > %s",
-                        $Config->get("Niceness"),
+                my $Cmd = sprintf("perl close-areas.pl $X $Y $Zoom < %s > %s",
                         "$inputFile",
                         "$outputFile");
                 statusMessage("Running close-areas", $currentSubTask, $progressJobs, $progressPercent,0);
@@ -1067,8 +1073,7 @@
             }
             elsif ($preprocessor eq "mercator")
             {
-                my $Cmd = sprintf("%s perl mercatorize.pl %s > %s",
-                        $Config->get("Niceness"),
+                my $Cmd = sprintf("perl mercatorize.pl %s > %s",
                         "$inputFile",
                         "$outputFile");
                 statusMessage("Running Mercatorization", $currentSubTask, $progressJobs, $progressPercent,0);
@@ -1455,8 +1460,7 @@
 
         $XslFile = "osmarender/osmarender.xsl";
 
-        my $Cmd = sprintf("%s \"%s\" tr --maxdepth %s %s %s > \"%s\"",
-          $Config->get("Niceness"),
+        my $Cmd = sprintf("\"%s\" tr --maxdepth %s %s %s > \"%s\"",
           $Config->get("XmlStarlet"),
           $Config->get("XmlStarletMaxDepth"),
           $XslFile,
@@ -1469,8 +1473,7 @@
     elsif($Config->get("Osmarender") eq "orp")
     {
         chdir "orp";
-        my $Cmd = sprintf("%s perl orp.pl -r %s -o %s",
-          $Config->get("Niceness"),
+        my $Cmd = sprintf("perl orp.pl -r %s -o %s",
           $MapFeatures,
           $TSVG);
 
@@ -1500,8 +1503,7 @@
 #-----------------------------------------------------------------------------
     if (!$NoBezier) 
     {   # do bezier curve hinting
-        my $Cmd = sprintf("%s perl ./lines2curves.pl %s > %s",
-          $Config->get("Niceness"),
+        my $Cmd = sprintf("perl ./lines2curves.pl %s > %s",
           $TSVG,
           $SVG);
         statusMessage("Beziercurvehinting zoom level $zoom", $currentSubTask, $progressJobs, $progressPercent,0);
@@ -1561,9 +1563,8 @@
 
     if ($Config->get("Batik") == "1") # batik as jar
     {
-        $Cmd = sprintf("%s%s java -Xms256M -Xmx%s -jar %s -w %d -h %d -a %f,%f,%f,%f -m image/png -d \"%s\" \"%s%s\" > %s", 
+        $Cmd = sprintf("%s java -Xms256M -Xmx%s -jar %s -w %d -h %d -a %f,%f,%f,%f -m image/png -d \"%s\" \"%s%s\" > %s", 
         $Config->get("i18n") ? "LC_ALL=C " : "",
-        $Config->get("Niceness"),
         $Config->get("BatikJVMSize"),
         $Config->get("BatikPath"),
         $SizeX,
@@ -1576,9 +1577,8 @@
     }
     elsif ($Config->get("Batik") == "2") # batik as executable (wrapper of some sort, i.e. on gentoo)
     {
-        $Cmd = sprintf("%s%s \"%s\" -w %d -h %d -a %f,%f,%f,%f -m image/png -d \"%s\" \"%s%s\" > %s",
+        $Cmd = sprintf("%s \"%s\" -w %d -h %d -a %f,%f,%f,%f -m image/png -d \"%s\" \"%s%s\" > %s",
         $Config->get("i18n") ? "LC_ALL=C " : "",
-        $Config->get("Niceness"),
         $Config->get("BatikPath"),
         $SizeX,
         $SizeY,
@@ -1601,9 +1601,8 @@
     }
     else
     {
-        $Cmd = sprintf("%s%s \"%s\" -z -w %d -h %d --export-area=%f:%f:%f:%f --export-png=\"%s\" \"%s%s\" > %s", 
+        $Cmd = sprintf("%s \"%s\" -z -w %d -h %d --export-area=%f:%f:%f:%f --export-png=\"%s\" \"%s%s\" > %s", 
         $Config->get("i18n") ? "LC_ALL=C " : "",
-        $Config->get("Niceness"),
         $Config->get("Inkscape"),
         $SizeX,
         $SizeY,
@@ -1855,8 +1854,7 @@
             elsif ($Config->get("PngQuantizer") eq "pngnq") {
                 if ($EnvironmentInfo{"pngnq"})
                 {
-                    $Cmd = sprintf("%s \"%s\" -e .png%s -s1 -n256 %s %s",
-                                   $Config->get("Niceness"),
+                    $Cmd = sprintf("\"%s\" -e .png%s -s1 -n256 %s %s",
                                    $Config->get("pngnq"),
                                    $Filename2_suffix,
                                    $Filename,
@@ -1886,8 +1884,7 @@
 
             if ($Config->get("PngOptimizer") eq "pngcrush")
             {
-                $Cmd = sprintf("%s \"%s\" -q %s %s %s",
-                  $Config->get("Niceness"),
+                $Cmd = sprintf("\"%s\" -q %s %s %s",
                   $Config->get("Pngcrush"),
                   $Filename2,
                   $Filename,
@@ -1895,8 +1892,7 @@
             }
             elsif ($Config->get("PngOptimizer") eq "optipng")
             {
-                $Cmd = sprintf("%s \"%s\" %s -out %s %s", #no quiet, because it even suppresses error output
-                  $Config->get("Niceness"),
+                $Cmd = sprintf("\"%s\" %s -out %s %s", #no quiet, because it even suppresses error output
                   $Config->get("Optipng"),
                   $Filename2,
                   $Filename,
@@ -1993,9 +1989,8 @@
     }
 
     statusMessage("Starting BatikAgent\n", $currentSubTask, $progressJobs, $progressPercent,0);
-    my $Cmd = sprintf("%s%s java -Xms256M -Xmx%s -cp %s org.tah.batik.ServerMain -p %d > /dev/null&", 
+    my $Cmd = sprintf("%s java -Xms256M -Xmx%s -cp %s org.tah.batik.ServerMain -p %d > /dev/null&", 
     $Config->get("i18n") ? "LC_ALL=C " : "",
-    $Config->get("Niceness"),
     $Config->get("BatikJVMSize"),
     $Config->get("BatikClasspath"),
     $Config->get("BatikPort")
Index: tilesAtHome.conf.linux
===================================================================
--- tilesAtHome.conf.linux	(revision 9419)
+++ tilesAtHome.conf.linux	(working copy)
@@ -7,7 +7,7 @@
 WorkingDirectory=/tmp/
 Inkscape=inkscape
 XmlStarlet=xmlstarlet
-Niceness=nice -n10
+Niceness=10
 Pngcrush=pngcrush
 Optipng=optipng
 Subversion=svn
Index: config.defaults
===================================================================
--- config.defaults	(revision 9419)
+++ config.defaults	(working copy)
@@ -21,7 +21,7 @@
 ProcessLogFile = /tmp/tah.log
 
 WorkingDirectory = tmp/
-Niceness = nice -n10
+Niceness = 10
 
 DownloadTimeout = 1800
 KeepDataFile = 0