static int getRowsPerGB(final TestOptions opts) {
    return ONE_GB / ((opts.valueRandom ? opts.valueSize / 2 : opts.valueSize) * opts.getFamilies()
      * opts.getColumns());
  }
Validates opts after all the opts are parsed, so that caller need not to maintain order of opts
hbase-diagnostics/src/main/java/org/apache/hadoop/hbase/PerformanceEvaluation.java