/**
* If we have a timeline, figure out what each thread was doing at each point in time.
* Basically CPU utilization from the timeline.
*
* @param TestPaths $localPaths Paths related to this run/step
* @return array|null An array of threads with each thread being an array of slices (one for
* each time period). Each slice is an array of events and the fraction of that
* slice that they consumed (with a total maximum of 1 for any slice).
*/
function DevToolsGetCPUSlicesForStep($localPaths)
{
$slices = null;
$slices_file = $localPaths->devtoolsCPUTimelineFile() . ".gz";
$trace_file = $localPaths->devtoolsTraceFile() . ".gz";
$script_timing = $localPaths->devtoolsScriptTimingFile() . ".gz";
if (!GetSetting('disable_timeline_processing') && !is_file($slices_file) && is_file($trace_file) && is_file(__DIR__ . '/lib/trace/trace-parser.py')) {
$script = realpath(__DIR__ . '/lib/trace/trace-parser.py');
touch($slices_file);
if (is_file($slices_file)) {
$slices_file = realpath($slices_file);
unlink($slices_file);
}
$user_timing = $localPaths->chromeUserTimingFile() . ".gz";
touch($user_timing);
if (is_file($user_timing)) {
$user_timing = realpath($user_timing);
unlink($user_timing);
}
$trace_file = realpath($trace_file);
$command = "python \"{$script}\" -t \"{$trace_file}\" -u \"{$user_timing}\" -c \"{$slices_file}\" -j \"{$script_timing}\" 2>&1";
exec($command, $output, $result);
if (!is_file($slices_file)) {
touch($slices_file);
}
}
if (gz_is_file($slices_file)) {
$slices = json_decode(gz_file_get_contents($slices_file), true);
}
if (isset($slices) && !is_array($slices)) {
$slices = null;
}
return $slices;
}
