/**
* When one RunningStat instance is merged into another, the state of the
* target RunningInstance should have the state that it would have had if
* all the data had been accumulated by it alone.
* @covers RunningStat::merge
* @covers RunningStat::count
*/
public function testRunningStatMerge()
{
$expected = new RunningStat();
foreach ($this->points as $point) {
$expected->push($point);
}
// Split the data into two sets
$sets = array_chunk($this->points, floor(count($this->points) / 2));
// Accumulate the first half into one RunningStat object
$first = new RunningStat();
foreach ($sets[0] as $point) {
$first->push($point);
}
// Accumulate the second half into another RunningStat object
$second = new RunningStat();
foreach ($sets[1] as $point) {
$second->push($point);
}
// Merge the second RunningStat object into the first
$first->merge($second);
$this->assertEquals(count($first), count($this->points));
$this->assertEquals($first, $expected);
}
/**
* Update an entry with timing data.
*
* @param string $name Section name
* @param float $elapsedCpu Elapsed CPU time
* @param float $elapsedWall Elapsed wall-clock time
*/
public function updateRunningEntry($name, $elapsedCpu, $elapsedWall)
{
// If this is the first measurement for this entry, store plain values.
// Many profiled functions will only be called once per request.
if (!isset($this->mCollated[$name])) {
$this->mCollated[$name] = array('cpu' => $elapsedCpu, 'wall' => $elapsedWall, 'count' => 1);
return;
}
$entry =& $this->mCollated[$name];
// If it's the second measurement, convert the plain values to
// RunningStat instances, so we can push the incoming values on top.
if ($entry['count'] === 1) {
$cpu = new RunningStat();
$cpu->push($entry['cpu']);
$entry['cpu'] = $cpu;
$wall = new RunningStat();
$wall->push($entry['wall']);
$entry['wall'] = $wall;
}
$entry['count']++;
$entry['cpu']->push($elapsedCpu);
$entry['wall']->push($elapsedWall);
}
