Merge pull request gajus#37 from mdevine82/master

- Add thresholds to allow run data to be ignored if it doesn't exceed se...

inc/prepend.php

@@ -65,6 +65,11 @@ function xhprof_shutdown()
         fastcgi_finish_request();
     }
 
+    //Check to see if xhprof data exceed minimum set profile times
+    if (!xhprof_check_min_run_values($xhprof_data, $xhprofMainConfig)) {
+            return;
+    }
+
     try {
         require_once __DIR__ . '/../xhprof/classes/data.php';
 
@@ -84,3 +89,35 @@ function xhprof_shutdown()
         throw $e;
     }
 }
+
+// Check profile run times and opt not to store the data if they are below
+// set thresholds.  This should reduce amount of stored data for production
+// instances.
+function xhprof_check_min_run_values($profile_data, $xhprofMainConfig) {
+    $store_flag = true;
+
+    $lastElement = end($profile_data);
+
+    $wallTimeExists = isset($lastElement['wt']) && isset($xhprofMainConfig['min_wall_time']);
+
+    if ($wallTimeExists && $lastElement['wt'] < $xhprofMainConfig['min_wall_time']) {
+            $store_flag = false;
+    }
+
+    $cpuTimeExists = isset($lastElement['cpu']) && isset($xhprofMainConfig['min_cpu_time']);
+    if ($store_flag && $cpuTimeExists && $lastElement['cpu'] < $xhprofMainConfig['min_cpu_time']) {
+            $store_flag = false;
+    }
+
+    $memUsageExists = isset($lastElement['mu']) && isset($xhprofMainConfig['min_mem_usage']);
+    if ($store_flag && $memUsageExists && $lastElement['mu'] < $xhprofMainConfig['min_mem_usage']) {
+            $store_flag = false;
+    }
+
+    $peakMemUsageExists = isset($lastElement['pmu']) && isset($xhprofMainConfig['min_peak_mem_usage']);
+    if ($store_flag && $peakMemUsageExists && $lastElement['pmu'] < $xhprofMainConfig['min_peak_mem_usage']) {
+            $store_flag = false;
+    }
+
+    return $store_flag;
+}

xhprof/includes/config.inc.sample.php

@@ -5,5 +5,9 @@
     'pdo' => new PDO('mysql:dbname=your_database_name;host=localhost;charset=utf8', 'username', 'password'),
     'tmp_table_engine' => 'Memory', // MySQL Table Engine used for temporary tables
     'cache_expiration' => '60', // How many seconds a browser allowed to cache profilling results
-    'profiler_enabled' => true // Global switch to disable the profiler by default
-);
+    'profiler_enabled' => true, // Global switch to disable the profiler by default
+    'min_wall_time' => 0, // Only store runs with total wall time greater than value (microseconds)
+    'min_cpu_time' => 0, // Only store runs with total CPU time greater than value (microseconds)
+    'min_mem_usage' => 0, // Only store runs with memory usage greater than value (bytes)
+    'min_peak_mem_usage' => 0, // Only store runs with peak memory usage greater than value (bytes)
+);