patch to work kinda around mem issues

mem.diff

diff -u src/tilemill/node_modules/tilelive-mapnik/lib//mapnik.js /usr/share/tilemill/node_modules/tilelive-mapnik/lib//mapnik.js
--- src/tilemill/node_modules/tilelive-mapnik/lib//mapnik.js	2012-03-02 12:40:05.000000000 -0500
+++ /usr/share/tilemill/node_modules/tilelive-mapnik/lib//mapnik.js	2012-03-01 21:56:50.000000000 -0500
@@ -8,7 +8,7 @@
 var Pool = require('generic-pool').Pool;
 var LockingCache = require('./lockingcache');
 var sm = new (require('sphericalmercator'));
-
+var os = require('os');
 var cache = {};
 
 // Increase number of threads to 1.5x the number of logical CPUs.
@@ -208,7 +208,15 @@
         create: function(callback) {
             var map = new mapnik.Map(256, 256);
             map.bufferSize = source._uri.query.bufferSize;
-            map.fromString(xml, {
+            console.log('creating map');
+            console.log('free: ' + os.freemem() + ' load: ' + os.loadavg() + ' % free: ' + os.freemem()/os.totalmem()*100);
+            try {
+                map.fromStringSync(xml,{strict:true,base:source._base+'/'});
+            } catch (err) {
+                return callback(err);
+            }
+            callback(null,map);
+            /*map.fromString(xml, {
                 strict: false,
                 base: source._base + '/'
             }, function(err, map) {
@@ -216,13 +224,15 @@
                 // Wrap zoomAll() with a try/catch and don't bail on error.
                 // Certain layers/projections seem to cause an error here that
                 // need not be fatal.
-                try {
-                    map.zoomAll();
-                } catch(e) {};
+                //try {
+                //    map.zoomAll();
+                //} catch(e) {};
                 callback(null, map);
             });
+            */
         },
         destroy: function(map) {
+            console.log('clearing');
             map.clear();
             delete map;
         },
diff -u src/tilemill/node_modules/tilelive-mapnik/lib//render.js /usr/share/tilemill/node_modules/tilelive-mapnik/lib//render.js
--- src/tilemill/node_modules/tilelive-mapnik/lib//render.js	2012-03-02 12:40:05.000000000 -0500
+++ /usr/share/tilemill/node_modules/tilelive-mapnik/lib//render.js	2012-03-01 22:30:39.000000000 -0500
@@ -4,6 +4,7 @@
 
 var MapnikSource = require('./mapnik');
 var solidCache = {};
+var os = require('os');
 
 var EARTH_RADIUS = 6378137;
 var EARTH_DIAMETER = EARTH_RADIUS * Math.PI;
@@ -89,9 +90,16 @@
 
     // Add stats.
     options.source._stats.total++;
-    if (solid !== false) options.source._stats.solid++;
+    if (solid !== false) {
+        options.source._stats.solid++;
+        console.log(options.source._stats.solid);
+    }
     if (solid !== false && image.painted()) options.source._stats.solidPainted++;
-
+    if (options.source._stats.solid%100 == 0) {
+        console.log('start...forcing gc!');
+        while(!mapnik.gc()) {}
+        console.log('end.....forcing gc!');
+    }
     // If solid and image buffer is cached skip image encoding.
     if (solid && solidCache[solid]) return callback(null, solidCache[solid]);
 
@@ -118,6 +126,7 @@
     // Calculate bbox from xyz, respecting metatile settings.
     var meta = calculateMetatile(options);
 
+    console.log('free: ' + os.freemem() + ' load: ' + os.loadavg() + ' % free: ' + os.freemem()/os.totalmem()*100);
     // Set default options.
     if (options.format === 'utf') {
         var interactivity = source._mml.interactivity;