JavaFX滚动表更新性能会随着时间的推移而降低 [英] JavaFX scrolling table update performance degrades over time
问题描述
我有一个显示最后N个项目的TableView,顶部的新项目,从底部删除项目等等......似乎正在发生的事情是CPU负载随着时间的推移而增加,以至于同一台计算机上的其他X应用程序变得迟缓。
平台详细信息:Redhat 6.7,32位,Java 1.8u40
我试过的东西
- 引入runLater() - 原始代码从非FX线程更新了可观察列表 - 显然这是错误的
- Optimize - 如果尚未进行更新,则仅在JavaFX应用程序线程上放置新的Runnables
- 优化-bunk更新Observable列表而不是单独添加
- 使用jvisual VM来识别任何内存泄漏,找不到任何内容。
- 我试图重新创建这个
- Windows 7(在金属上) - JDK 8u40 64位=>未发生
- Ubuntu 16.04 JDK 8u40 64位(在具有vmwgfx的VM内)=>不会发生
- Ubuntu 16.04 OpenJDK + OpenJFX最新版(8u91)(金属上)=> 发生
JVisual VM - 新硬件上的Redhat 6u7(32位)
此问题属于较大的应用程序的一部分,但我已将其作为下面的小例子进行了隔离。这使得其他应用程序在几分钟后变得缓慢,但仅限于Redhat 6u7平台。
公共类TableUpdater扩展应用程序{
private int maxItems = 30;
private AtomicBoolean pending = new AtomicBoolean();
public class Thing {
private String foo;
public Thing(String foo){
this.foo = foo;
}
public String getFoo(){
return foo;
}
@Override
public int hashCode(){
return foo.hashCode();
}
@Override
public boolean equals(Object obj){
if(!(obj instanceof Thing)){
return false;
}
return((Thing)obj).foo.equals(foo);
}
}
public static void main(String [] args){
launch(args);
}
private int counter = 0;
private ObservableList< Thing>数据;
private List< Thing> itemsToAdd = Collections.synchronizedList(new ArrayList< Thing>());
@Override
public void start(Stage primaryStage)抛出异常{
TableView< Thing> table = new TableView<>();
data = FXCollections.observableArrayList();
table.setItems(data);
TableColumn< Thing,String> fooCol = new TableColumn<>(Foo);
fooCol.setCellValueFactory(new PropertyValueFactory< Thing,String>(foo));
table.getColumns()。addAll(fooCol);
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(() - > {
add(new Thing(String.format(%08d,counter ++)));
},0,2,TimeUnit.MILLISECONDS);
primaryStage.setScene(new Scene(table));
primaryStage.setWidth(400);
primaryStage.setHeight(400);
primaryStage.show();
}
private void add(事物){
itemsToAdd.add(thing);
if(!pending.getAndSet(true)){
Platform.runLater(() - > {
synchronized(itemsToAdd){
Collections.reverse( itemsToAdd);
data.addAll(0,itemsToAdd);
itemsToAdd.clear();
}
if(data.size()> maxItems){
data.remove(maxItems,data.size());
}
pending.set(false);
});
}
}
}
问题
- 这个问题与我更新表格或底层错误的方式有关吗?
- 更高效更新表格的方法?
尝试使用G1GC垃圾收集器。我有一个类似但不完全相同的问题(tableview中的大量持久对象),这是通过使用G1GC解决的。
java XX: + UseG1GC
I have a TableView that shows last N items, new items at top, remove items from the bottom etc... What appears to be happening is CPU load increases over time to point where other X applications on same machine become sluggish.
Platform details: Redhat 6.7, 32 bit, Java 1.8u40
Things I've tried
- Introduced runLater() - original code updated the observable list from a non-FX thread - apparently this is wrong
- Optimize - only place new Runnables on JavaFX application thread if there isn't already an update in progress
- Optimize -bulk updates to the Observable list rather than individual adds
- used jvisual VM to indentify any memory leaks, couldn't find anything.
- I've tried to recreate this
- Windows 7 (on metal) - JDK 8u40 64 bit => does not occur
- Ubuntu 16.04 JDK 8u40 64 bit (inside a VM with vmwgfx) => does not occur
- Ubuntu 16.04 OpenJDK + OpenJFX latest (8u91) (on metal) => does occur
JVisual VM - Redhat 6u7 (32bit) on newish hardware
JVisual VM - Ubuntu 16.04 (64bit) on old hardware (2008 iMac)
This issue was part of larger app, but I've isolated it as a smaller example below. This makes other apps sluggish after a couple of minutes, but only on the Redhat 6u7 platform.
public class TableUpdater extends Application {
private int maxItems = 30;
private AtomicBoolean pending = new AtomicBoolean();
public class Thing {
private String foo;
public Thing(String foo) {
this.foo = foo;
}
public String getFoo() {
return foo;
}
@Override
public int hashCode() {
return foo.hashCode();
}
@Override
public boolean equals(Object obj) {
if (! (obj instanceof Thing)) {
return false;
}
return ((Thing)obj).foo.equals(foo);
}
}
public static void main(String[] args) {
launch(args);
}
private int counter = 0;
private ObservableList<Thing> data;
private List<Thing> itemsToAdd = Collections.synchronizedList(new ArrayList<Thing>());
@Override
public void start(Stage primaryStage) throws Exception {
TableView<Thing> table = new TableView<>();
data = FXCollections.observableArrayList();
table.setItems(data);
TableColumn<Thing, String> fooCol = new TableColumn<>("Foo");
fooCol.setCellValueFactory(new PropertyValueFactory<Thing, String>("foo"));
table.getColumns().addAll(fooCol);
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(() -> {
add(new Thing(String.format("%08d", counter++)));
}, 0, 2, TimeUnit.MILLISECONDS);
primaryStage.setScene(new Scene(table));
primaryStage.setWidth(400);
primaryStage.setHeight(400);
primaryStage.show();
}
private void add(Thing thing) {
itemsToAdd.add(thing);
if (!pending.getAndSet(true)) {
Platform.runLater(() -> {
synchronized (itemsToAdd) {
Collections.reverse(itemsToAdd);
data.addAll(0, itemsToAdd);
itemsToAdd.clear();
}
if (data.size() > maxItems) {
data.remove(maxItems, data.size());
}
pending.set(false);
});
}
}
}
Questions
- Is this issue something to do with way I'm updating the table or an underlying bug?
- Any more efficient ways to update the table?
Try using the G1GC garbage collector. I had a similar, but not identical, issue (large number of persistent objects in tableview) that was resolved by using G1GC.
java XX:+UseG1GC
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