/**
* Add the performance counter subscriptions to the specified role. A list of
* roles may be passed in using an array
*
* @global type $manager
* @global type $perf_counters
* @param Mixed $role - (String|Array)
*/
function add_perf_counters($role)
{
global $manager, $perf_counters;
//var_dump($role);
if (is_array($role)) {
// recursive
foreach ($role as $r) {
add_perf_counters($r);
}
}
$configuration = $manager->getConfigurationForRoleInstance($role);
foreach ($perf_counters as $c) {
$configuration->DataSources->PerformanceCounters->addSubscription($c, PERF_IN_SEC);
}
$configuration->DataSources->OverallQuotaInMB = 10;
$configuration->DataSources->PerformanceCounters->BufferQuotaInMB = 10;
$configuration->DataSources->PerformanceCounters->ScheduledTransferPeriodInMinutes = 1;
$manager->setConfigurationForRoleInstance($role, $configuration);
}
/*
$req_free_cpu = 70; // lowest % of free cpu allowed
$free_cpu = round(100 - $avg['cpu']);//round((1 - ($avg / ($num_current_roles * 100)) * 100);
$lower_threshold = 90; // % cpu free before removing an instance
echo "\n - Free CPU: $free_cpu";
echo "\n - Required Free CPU: $req_free_cpu";
echo "\n - Role Removal when % CPU free: $lower_threshold";
echo "\n - Number of running 'WebRole': $num_current_roles";
*/
// Check to see if any process is already running. If so then we cannot change role counts
$timer->mark('start_get_op_status');
$status = $client->getOperationStatus($lastRequestId);
$timer->mark('stop_get_op_status');
$timer->mark('start_update_perf_sub');
// Update instance configuration to add performance metric subscriptions
add_perf_counters(find_role_instances_by_name('WebRole'));
$timer->mark('stop_update_perf_sub');
if ($status->Status != 'InProgress') {
// Nothing found. Try updating the instance counts
if ($avg['avg_connections_per_role'] > 120 && $num_current_roles < MAX_WEBROLES) {
// Too many connections to handle. Scale out
$timer->mark('start_add_instance');
echo "\n - LOAD HIGH! Creating new role";
$client->setInstanceCountBySlot(AZURE_ROLE_END, 'production', 'WebRole', $num_current_roles + 5);
$lastRequestId = $client->getLastRequestId();
$timer->mark('stop_add_instance');
} else {
if ($avg['avg_connections_per_role'] < 20 && $num_current_roles > MIN_WEBROLES) {
echo "\n - Low load. Removing role";
$timer->mark('start_remove_instance');
$client->setInstanceCountBySlot(AZURE_ROLE_END, 'production', 'WebRole', $num_current_roles - 1);
