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我們有一個使用jython執行一些python腳本的JavaEE應用程序。所使用的堆空間越來越大，直到沒有更多的剩餘空間。在heapdump中，我可以說有很多Py *類。通過過度使用Java來增加堆ScriptEngine（Jyhton）
所以我寫了一個小的測試程序： TestApp
public class TestApp {
private final ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
private HashMap<String, ScriptEngine> scriptEngines = new HashMap<String, ScriptEngine>();
private final String scriptContainerPath = "";
public static void main(String[] args) throws InterruptedException {
int counter = 1;
while(true) {
System.out.println("iteration: " + counter);
TestApp testApp = new TestApp();
testApp.execute();
counter++;
Thread.sleep(100);
}
}
void execute() {
File scriptContainer = new File(scriptContainerPath);
File[] scripts = scriptContainer.listFiles();
if (scripts != null && scripts.length > 0) {
Arrays.sort(scripts, new Comparator<File>() {
@Override
public int compare(File file1, File file2) {
return file1.getName().compareTo(file2.getName());
}
});
for (File script : scripts) {
String engineName = ScriptExecutor.getEngineNameByExtension(script.getName());
if(!scriptEngines.containsKey(engineName)) {
scriptEngines.put(engineName, scriptEngineManager.getEngineByName(engineName));
}
ScriptEngine scriptEngine = scriptEngines.get(engineName);
try {
ScriptExecutor scriptExecutor = new ScriptExecutor(scriptEngine, script, null);
Boolean disqualify = scriptExecutor.getBooleanScriptValue("disqualify");
String reason = scriptExecutor.getStringScriptValue("reason");
System.out.println("disqualify: " + disqualify);
System.out.println("reason: " + reason);
} catch (Exception e) {
e.printStackTrace();
}
}
// cleanup
for(Map.Entry<String, ScriptEngine> entry : scriptEngines.entrySet()) {
ScriptEngine engine = entry.getValue();
engine.getContext().setErrorWriter(null);
engine.getContext().setReader(null);
engine.getContext().setWriter(null);
}
}
}
}
ScriptExecutor
public class ScriptExecutor {
private final static String pythonExtension = "py";
private final static String pythonEngine = "python";
private final ScriptEngine scriptEngine;
public ScriptExecutor(ScriptEngine se, File file, Map<String, Object> keyValues) throws FileNotFoundException, ScriptException {
scriptEngine = se;
if (keyValues != null) {
for (Map.Entry<String, Object> entry : keyValues.entrySet()) {
scriptEngine.put(entry.getKey(), entry.getValue());
}
}
// execute script
Reader reader = null;
try {
reader = new FileReader(file);
scriptEngine.eval(reader);
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// nothing to do
}
}
}
}
public Boolean getBooleanScriptValue(String key) {
// convert Object to Boolean
}
public String getStringScriptValue(String key) {
// convert Object to String
}
public static String getEngineNameByExtension(String fileName) {
String extension = fileName.substring(fileName.lastIndexOf(".") + 1);
if (pythonExtension.equalsIgnoreCase(extension)) {
System.out.println("Found engine " + pythonEngine + " for extension " + extension + ".");
return pythonEngine;
}
throw new RuntimeException("No suitable engine found for extension " + extension);
}
}
在指定的目錄是14個Python腳本，所有看起來像這樣：
disqualify = True
reason = "reason"
我使用以下VM參數啓動此程序： -Xrs -Xms16M -Xmx16M -XX：MaxPermSize = 32M -XX：NewRatio = 3 -Dsun.rmi.dgc.client.gcInterval = 300000 -Dsun.rmi.dgc.server.gcInterval = 300000 -XX：+ UseConcMarkSweepGC -XX ：+ UseParNewGC -XX：+ CMSPaRealRemarkEnabled -verbose：gc -XX：+ PrintGCDetails -XX：+ PrintGCTimeStamps -server
這些是我們的AppServer運行的參數。在我的測試用例中只有Xms，Xmx和MaxPermSize較小。
當我運行這個應用程序時，我可以看到CMS Old Gen池增加到其最大尺寸。之後Par Parden Space池增加。此外，ParNewGC在任何時候都不再運行。清理部分改善了情況，但沒有解決問題。有沒有人有一個想法，爲什麼我的堆沒有完全清理？