我在

Windows 7 64位計算機上運行一個用swing做的圖形java應用程序.

我的應用程序是一個可運行的jar文件,我使用以下命令從命令提示符啟動：

C:\path\to\jre\java.exe -jar myProg.jar

我的問題是,當我使用JRE8 32位而不使用JRE7 32位或JRE8 64位時,我會遇到巨大的性能問題.

請注意,應用程序使用相同的jar文件運行;唯一的區別是它是由不同的JRE運行的.

我嘗試了不同的JRE8版本,問題仍然存在……

當我使用“-verbose”參數比較兩個輸出時,我看到我獲得了超過1500個帶有文本的輸出：'[來自共享對象文件的加載的xxxxxx]’用于JRE7而我沒有得到JRE8.

梅比可能會以某種方式聯系起來？

有誰知道問題可能是什么？

以下是JRE7的一些輸出

[Loaded MainFrame.MainFrame$XtrFileFilter from rsrc:./]

[Loaded java.awt.event.HierarchyListener from shared objects file]

[Loaded java.lang.InterruptedException from shared objects file]

[Loaded java.io.FileWriter from shared objects file]

[Loaded javax.swing.CellEditor from shared objects file]

[Loaded javax.swing.table.TableCellEditor from shared objects file]

[Loaded java.awt.image.RenderedImage from shared objects file]

[Loaded java.awt.image.WritableRenderedImage from shared objects file]

[Loaded java.awt.image.BufferedImage from shared objects file]

[Loaded sun.awt.util.IdentityArrayList from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]

[Loaded java.awt.Window$Type from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]

[Loaded java.util.concurrent.atomic.AtomicBoolean from shared objects file]

[Loaded sun.awt.AWTAccessor$WindowAccessor from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]

[Loaded java.awt.Window$1 from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]

[Loaded sun.awt.AWTAccessor$FrameAccessor from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]

[Loaded java.awt.Frame$1 from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]

[Loaded java.awt.ComponentOrientation from shared objects file]

[Loaded java.awt.Component$3 from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]

[Loaded javax.swing.ImageIcon from shared objects file]

[Loaded MainFrame.Simulation.Simulation from rsrc:./]

[Loaded MainFrame.Optimization.Optimization from rsrc:./]

[Loaded MainFrame.Convergence.Convergence from rsrc:./]

[Loaded java.awt.event.WindowEvent from shared objects file]

[Loaded MainFrame.Menu from rsrc:./]

以下是一些JRE8輸出

[Loaded MainFrame.MainFrame from rsrc:./]

[Loaded java.util.EventListener from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded java.awt.event.ActionListener from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded javax.swing.Action from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.reflect.NativeMethodAccessorImpl from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.reflect.DelegatingMethodAccessorImpl from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded javax.swing.UIManager from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded javax.swing.UIManager$LookAndFeelInfo from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.awt.OSInfo from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.awt.OSInfo$WindowsVersion from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.awt.OSInfo$1 from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.awt.OSInfo$OSType from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded java.awt.Toolkit from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.awt.AWTAccessor$ToolkitAccessor from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded java.awt.Toolkit$4 from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.awt.AWTAccessor from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded java.awt.Toolkit$5 from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded java.util.ResourceBundle$Control from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

[Loaded sun.util.CoreResourceBundleControl from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]

我為JRE7和JRE8運行了一個Xshare：dump,我得到了以下結果：

JRE7：

Loading classes to share ... done.

Rewriting and unlinking classes ... done.

Calculating hash values for String objects .. done.

Calculating fingerprints ... done.

Removing unshareable information ... done.

Moving common symbols to metadata section at 0x3a033570 ... done.

Moving vmSymbols to metadata section at 0x3a1d2170 ... done.

Moving the remaining symbols to metadata section at 0x3a1d3478 ... done.

Moved 44361 symbols, 1703760 bytes.

Moving pre-ordered read-only objects to shared space at 0x38a30000 ... done.

Moving read-only objects to shared space at 0x38e129b0 ... done.

Moving string char arrays to shared space at 0x38e20cd8 ... done.

Moving pre-ordered read-write objects to shared space at 0x39430000 ... done.

Moving read-write objects to shared space at 0x399e8fb0 ... done.

Moving String objects to shared space at 0x39a3e920 ... done.

Read-write space ends at 0x39a7dd28, 6610216 bytes.

Updating references to shared objects ... done.

An error has occurred while processing the shared archive file.

Unable to create shared archive file c:\Program Files (x86)\Java\jdk1.7.0_45\jre\bin\client\classes.jsa.

Error occurred during initialization of VM

Unable to use shared archive.

JRE8：

Allocated shared space: 27394048 bytes at 0x14a00000

Loading classes to share ...

Preload Warning: Cannot find javax/swing/JComponent$2

Preload Warning: Cannot find javax/swing/RepaintManager$1$1

Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue

Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue$1

Preload Warning: Cannot find javax/swing/text/AbstractDocument$InsertStringResult

Preload Warning: Cannot find sun/awt/windows/WToolkit$3$1

Preload Warning: Cannot find sun/java2d/Disposer$2

Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1

Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1$1

Loading classes to share: done.

Rewriting and linking classes ...

Rewriting and linking classes: done

Number of classes 2383

instance classes = 2369

obj array classes = 6

type array classes = 8

Calculating fingerprints ... done.

Removing unshareable information ... done.

Shared Lookup Cache Table Buckets = 4108 bytes

Shared Lookup Cache Table Body = 50352 bytes

ro space: 5650016 [ 47.7% of total] out of 12582912 bytes [44.9% used] at 0x14a00000

rw space: 5396096 [ 45.6% of total] out of 12582912 bytes [42.9% used] at 0x15600000

md space: 753892 [ 6.4% of total] out of 2097152 bytes [35.9% used] at 0x16200000

mc space: 34032 [ 0.3% of total] out of 131072 bytes [26.0% used] at 0x16400000

total : 11834036 [100.0% of total] out of 27394048 bytes [43.2% used]

總結

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