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A complete, Java-based solution for accessing, manipulating,
and outputting XML data
package org.jdom2.contrib.perf;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
@SuppressWarnings("javadoc")
public class PerfTest {
public static final long timeRun(TimeRunnable torun) throws Exception {
long min = Long.MAX_VALUE;
long max = Long.MIN_VALUE;
long sum = 0L;
final int cnt = 12;
for (int i = 0 ; i < cnt; i++) {
System.gc();
long time = System.nanoTime();
torun.run();
time = System.nanoTime() - time;
if (time > max) {
max = time;
}
if (time < min) {
min = time;
}
sum += time;
}
return (sum - (min + max)) / (cnt - 2);
}
public static final long usedMem() {
long mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
boolean stable = false;
Thread gct = new Thread("GCPrompt") {
@Override
public void run() {
System.gc();
}
};
gct.setDaemon(true);
try {
gct.start();
Thread.sleep(100);
gct.join();
} catch (Exception e) {
// ignore;
}
do {
int cnt = 3;
while (--cnt >= 0) {
System.gc();
}
long tmpmem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
long diff = mem - tmpmem;
mem = tmpmem;
if (diff >= 0 && diff < 128) {
stable = true;
}
} while (!stable);
return mem;
}
private static final String[] suffix = new String[]{"Bytes", "KiB", "MiB", "GiB", "TiB" };
private static final String formatMem(long mem) {
double frac = mem;
int cnt = 0;
while (frac > 1024.0) {
frac /= 1024.0;
cnt++;
}
return String.format("%.2f%s", frac, suffix[cnt]);
}
/**
* @param args
*/
public static void main(String[] args) {
ArrayList infiles = new ArrayList();
final FileFilter filefilter = new FileFilter() {
@Override
public boolean accept(File path) {
return path.isFile() && path.getName().toLowerCase().endsWith(".xml");
}
};
for (String arg : args) {
File f = new File(arg);
if (f.exists()) {
if (f.isFile() && f.getName().toLowerCase().endsWith(".xml")) {
infiles.add(f);
} else if (f.isDirectory()) {
File[] files = f.listFiles(filefilter);
if (files.length > 0) {
for (File sf : files) {
infiles.add(sf);
}
} else {
System.err.println("Ignoring File " + f + ": Directory has no XML files.");
}
} else {
System.err.println("Ignoring File " + f + ": not .xml and not Directory.");
}
} else {
System.err.println("Ignoring File " + f + ": does not exist.");
}
}
if (infiles.isEmpty()) {
File tryhamlet = new File("contrib/src/resources/hamlet.xml");
if (tryhamlet.exists()) {
System.out.println("Using default file " + tryhamlet);
infiles.add(tryhamlet);
}
}
System.out.printf("Processing %d files.\n", infiles.size());
StringBuilder html = new StringBuilder();
perfloop(infiles, html);
perfloop(infiles, html);
System.out.println("Ignore the above warm-up results!\n\n");
html.setLength(0);
html.append("\n\t
\n\t\n\tDescription - change me\n\t
\n\t\n\t\t");
for (String h : new String[] {"Input", "JDOM", "SAX", "SAXJ", "DOM", "DOMJ",
"StAXS", "StAXSJ", "StAXE", "StAXEJ", "Scan", "Dump",
"Dupe", "XPath", "Checked", "UnChecked"}) {
html.append("").append(h).append(" ");
}
html.append(" \n");
for (int i = 0; i < 5; i++) {
perfloop(infiles, html);
}
html.append("\t
\n");
System.out.println(html.toString());
}
private static final void perfloop(List infiles, StringBuilder html) {
double mstime = 1000000.0;
PerfDoc[] docs = new PerfDoc[infiles.size()];
int cnt = 0;
long bytecnt = 0L;
for (File f : infiles) {
try {
docs[cnt++] = new PerfDoc(f);
} catch (IOException e) {
throw new IllegalStateException("Unable to load " + f, e);
}
bytecnt += f.length();
}
long loadmem = 0L;
long saxtime = 0L;
long saxdtime = 0L;
long startmem = usedMem();
for (PerfDoc pd : docs) {
try {
saxtime += pd.saxLoad();
loadmem += pd.getLoadMem();
saxdtime += pd.getSaxDTime();
// System.out.println("Loaded " + pd.getFile());
} catch (Exception e) {
System.err.println("Failed to load " + pd);
e.printStackTrace();
}
}
long actloadmem = usedMem() - startmem;
double pctdiff = ((actloadmem - loadmem) * 100.0) / actloadmem;
if (pctdiff < 0.0) {
pctdiff = -1.0 * pctdiff;
}
if (pctdiff > 1.0) {
throw new IllegalStateException(
String.format("Memory calculations do not add up direct=%s sum=%s.",
formatMem(actloadmem), formatMem(loadmem)));
}
usedMem();
long domtime = 0L;
long domdtime = 0L;
for (PerfDoc pd : docs) {
try {
domtime += pd.domLoad();
domdtime += pd.getDomDTime();
} catch (Exception e) {
System.err.println("Failed to DOM " + pd);
e.printStackTrace();
}
}
usedMem();
long staxtime = 0L;
long staxdtime = 0L;
for (PerfDoc pd : docs) {
try {
staxtime += pd.staxLoad();
staxdtime += pd.getStaxDTime();
} catch (Exception e) {
System.err.println("Failed to STAX " + pd);
e.printStackTrace();
}
}
usedMem();
long staxetime = 0L;
long staxdetime = 0L;
for (PerfDoc pd : docs) {
try {
staxetime += pd.staxELoad();
staxdetime += pd.getStaxDETime();
} catch (Exception e) {
System.err.println("Failed to STAX " + pd);
e.printStackTrace();
}
}
long scantime = 0L;
for (PerfDoc pd : docs) {
try {
scantime += pd.scan();
} catch (Exception e) {
System.err.println("Failed to scan " + pd);
e.printStackTrace();
}
}
usedMem();
long dumptime = 0L;
for (PerfDoc pd : docs) {
try {
dumptime += pd.dump();
} catch (Exception e) {
System.err.println("Failed to dump " + pd);
e.printStackTrace();
}
}
usedMem();
long dupetime = 0L;
for (PerfDoc pd : docs) {
try {
dupetime += pd.duplicate();
} catch (Exception e) {
System.err.println("Failed to dupe " + pd);
e.printStackTrace();
}
}
usedMem();
long xpathtime = 0L;
for (PerfDoc pd : docs) {
try {
xpathtime += pd.xpath();
} catch (Exception e) {
System.err.println("Failed to xpath " + pd);
e.printStackTrace();
}
}
usedMem();
long checkedtime = 0L;
for (PerfDoc pd : docs) {
try {
checkedtime += pd.checkedParse();
} catch (Exception e) {
System.err.println("Failed to checked-parse " + pd);
e.printStackTrace();
}
}
long uncheckedtime = 0L;
for (PerfDoc pd : docs) {
try {
uncheckedtime += pd.unCheckedParse();
} catch (Exception e) {
System.err.println("Failed to unchecked-parse " + pd);
e.printStackTrace();
}
}
System.out.printf ("PERF: loadbytes=%s loadmem=%s sax=%.2fb(%.2fb) dom=%.2fb(%.2fb) " +
"staxs=%.2fb(%.2fb) staxe=%.2fb(%.2fb) " +
"scan=%.2fb dump=%.2fb dupe=%.2fb xpath=%.2fb checked=%.2fb unchecked=%.2fb \n",
formatMem(bytecnt), formatMem(loadmem), saxtime / mstime, saxdtime / mstime,
domtime / mstime, domdtime / mstime, staxtime / mstime, staxdtime / mstime,
staxetime / mstime, staxdetime / mstime,
scantime / mstime, dumptime / mstime, dupetime / mstime,
xpathtime / mstime, checkedtime / mstime, uncheckedtime / mstime);
html.append("\t\t").append(formatMem(bytecnt)).append(" ")
.append(formatMem(loadmem)).append(" ");
long[] times = new long[] {saxtime, saxtime - saxdtime, domtime, domtime - domdtime,
staxtime, staxtime - staxdtime, staxetime, staxetime - staxdetime,
scantime, dumptime, dupetime,
xpathtime, checkedtime, uncheckedtime};
for (long t : times) {
html.append("").append(String.format("%.2fms", t / mstime)).append(" ");
}
html.append(" © 2015 - 2025 Weber Informatics LLC | Privacy Policy