samples/counters.js

/*
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/**
 * This file can be run along with any script you want to run
 * to print aggregate stat counters from nashorn.
 *
 * Usage:  jjs -J-Dnashorn.debug <your-file.js> counters.js
 */

if (java.lang.System.getProperty("nashorn.debug") == null) {
    print("Usage: jjs -J-Dnashorn.debug <your-file.js> counters.js");
} else {
    Debug.dumpCounters();
}