private Severity getRuntimeSeverity(long runtimeMs) {
    return Severity.getSeverityAscending(
        runtimeMs,  runtimeLimits[0], runtimeLimits[1], runtimeLimits[2], runtimeLimits[3]);
  }
Analyzes mapper task speed and efficiency
app/com/linkedin/drelephant/tez/heuristics/TezScopeSpeedHeuristic.java