diff --git a/xCAT-server/lib/xcat/plugins/packimage.pm b/xCAT-server/lib/xcat/plugins/packimage.pm
index 02af3abc3..f93823588 100755
--- a/xCAT-server/lib/xcat/plugins/packimage.pm
+++ b/xCAT-server/lib/xcat/plugins/packimage.pm
@@ -366,17 +366,27 @@ sub process_request {
     $callback->({data=>["$verb contents of $rootimg_dir"]});
     unlink("$destdir/rootimg.gz");
     unlink("$destdir/rootimg.sfs");
+
+    my $compress="gzip";
+    #use "pigz" as the compress tool instead of gzip if "pigz" exist
+    my $ispigz=system("bash -c 'type -p pigz'");
+    if($ispigz == 0){
+       $compress="pigz";
+    }
+
+    $callback->({info=>["compress method:$compress"]});
+ 
     if ($method =~ /cpio/) {
         if ( ! $exlistloc ) {
-            $excludestr = "find . -xdev |cpio -H newc -o | gzip -c - > ../rootimg.gz";
+            $excludestr = "find . -xdev |cpio -H newc -o | $compress -c - > ../rootimg.gz";
         }else {
             chdir("$rootimg_dir");
             system("$excludestr >> $xcat_packimg_tmpfile"); 
             if ($includestr) {
             	system("$includestr >> $xcat_packimg_tmpfile"); 
             }
-            #$excludestr =~ s!-a \z!|cpio -H newc -o | gzip -c - > ../rootimg.gz!;
-            $excludestr = "cat $xcat_packimg_tmpfile|cpio -H newc -o | gzip -c - > ../rootimg.gz";
+            #$excludestr =~ s!-a \z!|cpio -H newc -o | $compress -c - > ../rootimg.gz!;
+            $excludestr = "cat $xcat_packimg_tmpfile|cpio -H newc -o | $compress -c - > ../rootimg.gz";
         }
         $oldmask = umask 0077;
     } elsif ($method =~ /squashfs/) {
diff --git a/xCAT-server/share/xcat/netboot/rh/genimage b/xCAT-server/share/xcat/netboot/rh/genimage
index 76b49dcb3..e7076f58c 100755
--- a/xCAT-server/share/xcat/netboot/rh/genimage
+++ b/xCAT-server/share/xcat/netboot/rh/genimage
@@ -955,6 +955,16 @@ sub mkinitrd_dracut {
     if ($dracutver > "033") {
         $additional_options .= " -N";
     }
+
+
+    #if "pigz" is available in the rootimg, use "pigz" instead of "gzip"
+    my $compress=qx(chroot $rootimg_dir bash -c "type -p pigz"|tr -d "\n");
+    if ($compress){
+        #take the online cpu numerber as the pigz processes number
+        my $processnum=qx(lscpu -p=cpu --online|grep -v '#'|wc -l|tr -d "\n");
+        $additional_options .= " --compress \"$compress -p $processnum \"";
+    }
+     print "\nchroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver\n";
     !system("chroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver")
         or die("Error: failed to generate the initial ramdisk for $mode.\n");
     print "the initial ramdisk for $mode is generated successfully.\n";
diff --git a/xCAT-server/share/xcat/netboot/sles/genimage b/xCAT-server/share/xcat/netboot/sles/genimage
index a05fc8c99..1bb216ef4 100755
--- a/xCAT-server/share/xcat/netboot/sles/genimage
+++ b/xCAT-server/share/xcat/netboot/sles/genimage
@@ -1088,6 +1088,16 @@ sub mkinitrd_dracut {
         $additional_options .= " -N";
     }
 
+
+    #if "pigz" is available in the rootimg, use "pigz" instead of "gzip"
+    my $compress=qx(chroot $rootimg_dir bash -c "type -p pigz"|tr -d "\n");
+    if ($compress){
+        #take the online cpu numerber as the pigz processes number
+        my $processnum=qx(lscpu -p=cpu --online|grep -v '#'|wc -l|tr -d "\n");
+        $additional_options .= " --compress \"$compress -p $processnum \"";
+    }
+     print "\nchroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver\n";
+
     !system("chroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver")
         or die("Error: failed to generate the initial ramdisk for $mode.\n");
     print "the initial ramdisk for $mode is generated successfully.\n";
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/genimage b/xCAT-server/share/xcat/netboot/ubuntu/genimage
index 36fe9bcb3..7ab1679d0 100755
--- a/xCAT-server/share/xcat/netboot/ubuntu/genimage
+++ b/xCAT-server/share/xcat/netboot/ubuntu/genimage
@@ -1629,39 +1629,50 @@ EOMS
 #   }
 
     system("chroot /tmp/xcatinitrd.$$/ depmod $kernelver");
-	# Copy udev and network scripts into initrd for s390x, which also works for other platforms
-	# udev
-	system("mkdir -p /tmp/xcatinitrd.$$/etc/udev");
-	system("cp -r $rootimg_dir/etc/udev/* /tmp/xcatinitrd.$$/etc/udev");
-	system("mkdir -p /tmp/xcatinitrd.$$/lib/udev");
-	system("cp -r $rootimg_dir/lib/udev/* /tmp/xcatinitrd.$$/lib/udev");
-	system("mkdir -p /tmp/xcatinitrd.$$/proc/self");
-	system("cp -r /proc/self/oom_adj /tmp/xcatinitrd.$$/proc/self");
-	
-	# Network related scripts
-        #system("echo $kernelver\n");
-	#system("mkdir -p /tmp/xcatinitrd.$$/sbin");
-	#system("cp -r $rootimg_dir/sbin/* /tmp/xcatinitrd.$$/sbin");
-	#system("mkdir -p /tmp/xcatinitrd.$$/lib/modules/$kernelver");
-	#system("cp -r $rootimg_dir/lib/modules/$kernelver/modules.dep /tmp/xcatinitrd.$$/lib/modules/$kernelver/modules.dep");
-	#system("mkdir -p /tmp/xcatinitrd.$$/etc/init.d");
-	#system("cp -r $rootimg_dir/etc/init.d/* /tmp/xcatinitrd.$$/etc/init.d");
-	#system("mkdir -p /tmp/xcatinitrd.$$/lib64");
-	#system("cp -r $rootimg_dir/lib64/* /tmp/xcatinitrd.$$/lib64");
-	#system("mkdir -p /tmp/xcatinitrd.$$/var/run/netreport");
-        symlink("busybox","/tmp/xcatinitrd.$$/bin/pivot_root");
-        symlink("busybox", "/tmp/xcatinitrd.$$/bin/udhcpc");
-        symlink("busybox", "/tmp/xcatinitrd.$$/sbin/ifconfig");
-        symlink("busybox", "/tmp/xcatinitrd.$$/bin/hostname");
-        symlink("busybox", "/tmp/xcatinitrd.$$/bin/route");
-        symlink("busybox", "/tmp/xcatinitrd.$$/bin/nc");
-        symlink("bash", "/tmp/xcatinitrd.$$/bin/sh");
-        symlink("bash", "/tmp/xcatinitrd.$$/sbin/sh");
+    # Copy udev and network scripts into initrd for s390x, which also works for other platforms
+    # udev
+    system("mkdir -p /tmp/xcatinitrd.$$/etc/udev");
+    system("cp -r $rootimg_dir/etc/udev/* /tmp/xcatinitrd.$$/etc/udev");
+    system("mkdir -p /tmp/xcatinitrd.$$/lib/udev");
+    system("cp -r $rootimg_dir/lib/udev/* /tmp/xcatinitrd.$$/lib/udev");
+    system("mkdir -p /tmp/xcatinitrd.$$/proc/self");
+    system("cp -r /proc/self/oom_adj /tmp/xcatinitrd.$$/proc/self");
+    
+    # Network related scripts
+    #system("echo $kernelver\n");
+    #system("mkdir -p /tmp/xcatinitrd.$$/sbin");
+    #system("cp -r $rootimg_dir/sbin/* /tmp/xcatinitrd.$$/sbin");
+    #system("mkdir -p /tmp/xcatinitrd.$$/lib/modules/$kernelver");
+    #system("cp -r $rootimg_dir/lib/modules/$kernelver/modules.dep /tmp/xcatinitrd.$$/lib/modules/$kernelver/modules.dep");
+    #system("mkdir -p /tmp/xcatinitrd.$$/etc/init.d");
+    #system("cp -r $rootimg_dir/etc/init.d/* /tmp/xcatinitrd.$$/etc/init.d");
+    #system("mkdir -p /tmp/xcatinitrd.$$/lib64");
+    #system("cp -r $rootimg_dir/lib64/* /tmp/xcatinitrd.$$/lib64");
+    #system("mkdir -p /tmp/xcatinitrd.$$/var/run/netreport");
+    symlink("busybox","/tmp/xcatinitrd.$$/bin/pivot_root");
+    symlink("busybox", "/tmp/xcatinitrd.$$/bin/udhcpc");
+    symlink("busybox", "/tmp/xcatinitrd.$$/sbin/ifconfig");
+    symlink("busybox", "/tmp/xcatinitrd.$$/bin/hostname");
+    symlink("busybox", "/tmp/xcatinitrd.$$/bin/route");
+    symlink("busybox", "/tmp/xcatinitrd.$$/bin/nc");
+    symlink("bash", "/tmp/xcatinitrd.$$/bin/sh");
+    symlink("bash", "/tmp/xcatinitrd.$$/sbin/sh");
 
-	
-   #copy("$rootimg_dir/lib/modules/*d","/tmp/xcatinitrd.$$/$_");
-   system("cd /tmp/xcatinitrd.$$;find .|cpio -H newc -o|gzip -9 -c - > $destdir/initrd-$mode.gz");
-   system("rm -rf /tmp/xcatinitrd.$$");
+
+    my $compress="gzip";
+    #if pigz is available,use pigz instead of gzip
+    my $ispigz=system("bash -c 'type -p pigz' >/dev/null 2>&1");
+    if($ispigz == 0){
+       $compress="pigz";
+    }else{
+       $compress="gzip";
+    }
+
+
+    #copy("$rootimg_dir/lib/modules/*d","/tmp/xcatinitrd.$$/$_");
+    print "\ncd /tmp/xcatinitrd.$$;find .|cpio -H newc -o|$compress -9 -c - > $destdir/initrd-$mode.gz \n";
+    system("cd /tmp/xcatinitrd.$$;find .|cpio -H newc -o|$compress -9 -c - > $destdir/initrd-$mode.gz");
+    system("rm -rf /tmp/xcatinitrd.$$");
 
 }