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Bench support.
There is a newer version: 0.2.1
package cdc.bench.support;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Formatting {
    public static final int KILO = 1000;
    public static final int MEGA = KILO * KILO;
    public static final int GIGA = KILO * MEGA;
    public static final int KILI = 1024;
    public static final int MEGI = KILI * KILI;
    public static final int GIGI = KILI * MEGI;
    private static final SimpleDateFormat SDF = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss,S");

    public static String formatSizeInKiB(long bytes) {
        return String.format("%.3f", (double) bytes / (double) KILI);
    }

    public static String formatSize(long bytes) {
        if (bytes >= GIGI) {
            return String.format("%.3f GiB", (double) bytes / (double) GIGI);
        } else if (bytes >= MEGI) {
            return String.format("%.3f MiB", (double) bytes / (double) MEGI);
        } else if (bytes >= KILI) {
            return String.format("%.3f KiB", (double) bytes / (double) KILI);
        } else {
            return String.format("%d B", bytes);
        }
    }

    public static String formatRateInKiBPers(long bytes,
                                             long nanos) {
        final double bytesPerSec = bytes * GIGA / nanos;
        return formatRateInKiBPers(bytesPerSec);
    }

    public static String formatRateInKiBPers(double bytesPerSec) {
        return String.format("%.3f", bytesPerSec / KILI);
    }

    public static String formatRate(double rate,
                                    double unit) {
        return String.format("%.3f", rate / unit);
    }

    public static String formatRate(long bytes,
                                    long nanos) {
        final double bytesPerSec = bytes * GIGA / nanos;
        if (bytesPerSec >= GIGI) {
            return String.format("%.3f GiB/s", bytesPerSec / GIGI);
        } else if (bytesPerSec >= MEGI) {
            return String.format("%.3f MiB/s", bytesPerSec / MEGI);
        } else if (bytesPerSec >= KILI) {
            return String.format("%.3f KiB/s", bytesPerSec / KILI);
        } else {
            return String.format("%d B/s", (int) bytesPerSec);
        }
    }

    public static String formatNanosInms(long nanos) {
        final double seconds = (double) nanos / (double) GIGA;
        return formatSecondsInms(seconds);
    }

    public static String formatSecondsInms(double seconds) {
        final double millis = seconds * KILO;
        return String.format("%.3f", millis);
    }

    public static String getCurrentTime() {
        final Calendar cal = Calendar.getInstance();
        cal.getTime();
        return SDF.format(cal.getTime());
    }
}