Name: nl37777 Date: 05/04/2001

The test case below shows a significant performance
regression in String encoding conversion from J2RE 1.3.1 to Merlin beta.
The average running times in milliseconds for three runs, using the
second and third cycle times only, on an Ultra 1 are:

Encoding 1.3.1 1.4 increase in
                               running time
Cp1252 4595 13497 194 %
ISO8859_1 3497 12026 244 %
MS932 5677 8367 47 %
EUC_JP 5898 8703 48 %
ISO2022JP 5883 8671 47 %

It's interesting to notice that the Cp1252 and ISO8859_1 converters used
are the new java.nio.Charset converters, while the MS932, EUC_JP, and
ISO2022JP converters used are the old sun.io converters.

The versions used are

java version "1.3.1-rc2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-rc2-b23)
Java HotSpot(TM) Client VM (build 1.3.1-rc2-b23, mixed mode)

java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b63)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b63, mixed mode)


import java.io.UnsupportedEncodingException;

public class StringTranscodingPerf {

    static String[] deStrings = {
        "German",
        // from metal_de.properties
        "Suchen in:",
        "Dateiname:",
        "Dateitypen:",
        "Eine Ebene h\u00F6her",
        "H\u00F6her",
        "Home",
        "Home",
        "Neuen Ordner erstellen",
        "Neuer Ordner",
        "Liste",
        "Liste",
        "Details",
        "Details",
        "Als Symbol darstellen",
        "Maximieren",
        "Schlie\u00DFen",
    };

    static String[] jaStrings = {
        "Japanese",
        // from metal_ja.properties
        "\u53c2\u7167:",
        "\u30d5\u30a1\u30a4\u30eb\u540d:",
        "\u30d5\u30a1\u30a4\u30eb\u30bf\u30a4\u30d7:",
        "1 \u30ec\u30d9\u30eb\u4e0a\u3078",
        "\u4e0a\u3078",
        "\u30db\u30fc\u30e0",
        "\u30db\u30fc\u30e0",
        "\u30d5\u30a9\u30eb\u30c0\u306e\u65b0\u898f\u4f5c\u6210",
        "\u65b0\u898f\u30d5\u30a9\u30eb\u30c0",
        "\u30ea\u30b9\u30c8",
        "\u30ea\u30b9\u30c8",
        "\u8a73\u7d30",
        "\u8a73\u7d30",
        "\u30a2\u30a4\u30b3\u30f3\u5316",
        "\u6700\u5927\u5316",
        "\u9589\u3058\u308b",
    };

    public static void main(String[] args) throws
UnsupportedEncodingException {
        testConversion(deStrings, "Cp1252");
        testConversion(deStrings, "ISO8859_1");
        testConversion(jaStrings, "MS932");
        testConversion(jaStrings, "EUC_JP");
        testConversion(jaStrings, "ISO2022JP");
    }

    private static void testConversion(String[] strings, String encoding)
             throws UnsupportedEncodingException {
        byte[][] bytes = new byte[strings.length][];
        String[] newStrings = new String[strings.length];

        // do each measurement three times to verify when hotspot is done
        for (int cycle = 0; cycle < 3; cycle++) {
            long start = System.currentTimeMillis();
            for (int count = 0; count < 10000; count++) {
                for (int index = 0; index < strings.length; index++) {
                    bytes[index] = strings[index].getBytes(encoding);
                    newStrings[index] = new String(bytes[index], encoding);
                }
            }
            System.out.println(strings[0] + ", " + encoding + ": "
                    + (System.currentTimeMillis() - start) + " ms");
        }

        for (int index = 0; index < strings.length; index++) {
            if (!newStrings[index].equals(strings[index])) {
                throw new RuntimeException(strings[index]
                        + " -> " + newStrings[index]);
            }
        }
    }
}