JVM 參數翻譯漢化解釋

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Behavioral Options（行爲參數）

 

Option and Default Value Description

-XX:-AllowUserSignalHandlers	Do not complain if the application installs signal handlers. (Relevant to Solaris and Linux only.) 容許應用程序安裝信號處理器（僅在solaris和linux起做用。）
-XX:AltStackSize=16384	Alternate signal stack size (in Kbytes). (Relevant to Solaris only, removed from 5.0.) 備用信號棧大小（僅在solaris起做用，從5.0起已經刪除）
-XX:-DisableExplicitGC	Disable calls to System.gc(), JVM still performs garbage collection when necessary. 禁止調用System.gc(), JVM 依然在必要時執行垃圾回收。
-XX:+FailOverToOldVerifier	Fail over to old verifier when the new type checker fails. (Introduced in 6.) 當新的類型檢查器失敗時轉移到舊的類型檢查器上（從6.0開始引進）
-XX:+HandlePromotionFailure	The youngest generation collection does not require a guarantee of full promotion of all live objects. (Introduced in 1.4.2 update 11) [5.0 and earlier: false.] 最年輕一代的垃圾收集不須要保證全部的活動對象徹底升級。
-XX:+MaxFDLimit	Bump the number of file descriptors to max. (Relevant  to Solaris only.) 文件描述符設置到最大。（只與solaris相關）
-XX:PreBlockSpin=10	Spin count variable for use with -XX:+UseSpinning. Controls the maximum spin iterations allowed before entering operating system thread synchronization code. (Introduced in 1.4.2.) 在啓用-XX:+UseSpinning 的狀況下，設置旋轉計數變量，來控制進入系統的線程同步代碼以前，容許的最大旋轉迭代次數。（在1.4.2引入）
-XX:-RelaxAccessControlCheck	Relax the access control checks in the verifier. (Introduced in 6.) 在驗證器裏放鬆訪問控制的檢查。（在6.0引入）
-XX:+ScavengeBeforeFullGC	Do young generation GC prior to a full GC. (Introduced in 1.4.1.) 最年輕一代GC優先於全局GC（在1.4.1引入）
-XX:+UseAltSigs	Use alternate signals instead of SIGUSR1 and SIGUSR2 for VM internal signals. (Introduced in 1.3.1 update 9, 1.4.1. Relevant to Solaris only.) 用備份信號代替JVM的SIGUSR1 和 SIGUSR2 （只和solaris相關）
-XX:+UseBoundThreads	Bind user level threads to kernel threads. (Relevant to Solaris only.) 綁定用戶級別的線程到內核線程。（只與solaris有關）
-XX:-UseConcMarkSweepGC	Use concurrent mark-sweep collection for the old generation. (Introduced in 1.4.1) 對老一代對象區使用同步標記並摖除垃圾收集算法（從1.4.1引進）
-XX:+UseGCOverheadLimit	Use a policy that limits the proportion of the VM's time that is spent in GC before an OutOfMemory error is thrown. (Introduced in 6.) 在OutOfMemory錯誤拋出以前，採用限制花費在GC上的時間在VM比例幅度的策略。（在6.0引入）
-XX:+UseLWPSynchronization	Use LWP-based instead of thread based synchronization. (Introduced in 1.4.0. Relevant to Solaris only.) 用基於LWP的同步來替代基於線程的同步。（從1.4.0引入，只和solaris相關）
-XX:-UseParallelGC	Use parallel garbage collection for scavenges. (Introduced in 1.4.1) 用並行垃圾收集的算法來清除對象。（從1.4.1起引入）
-XX:-UseParallelOldGC	Use parallel garbage collection for the full collections. Enabling this option automatically sets -XX:+UseParallelGC. (Introduced in 5.0 update 6.) 對整個收集使用並行垃圾收集算法，並自動設置-XX:+UseParallelGC。（從5.0引入升級到6.0）
-XX:-UseSerialGC	Use serial garbage collection. (Introduced in 5.0.) 使用系列垃圾收集算法（從5.0起引入）
-XX:-UseSpinning	Enable naive spinning on Java monitor before entering operating system thread synchronizaton code. (Relevant to 1.4.2 and 5.0 only.) [1.4.2, multi-processor Windows platforms: true] 在進入系統線程同步代碼以前在JAVA監視器上使用原生的旋轉。 （只與1.4.2和5.0相關，1.4.2只有在多處理器的windows平臺纔有效）
-XX:+UseTLAB	Use thread-local object allocation (Introduced in 1.4.0, known as UseTLE prior to that.) [1.4.2 and earlier, x86 or with -client: false] 用本地線程對象分配內存（從1.4.0引入，UseTLE優先於該選項，- client: 無效）
-XX:+UseSplitVerifier	Use the new type checker with StackMapTable attributes. (Introduced in 5.0.)[5.0: false] 用新類型檢查器裏用StackMapTable屬性。（從5.0開始引入）
-XX:+UseThreadPriorities	Use native thread priorities. 優先用本地線程
-XX:+UseVMInterruptibleIO	Thread interrupt before or with EINTR for I/O operations results in OS_INTRPT. (Introduced in 6. Relevant to Solaris only.) 在用I/O操做致使的OS_INTRPT或者使用線程終斷。 （在6.0引入，只與solaris有關）

 

Performance Options（性能參數）

 

Option and Default Value Description

-XX:+AggressiveOpts	Turn on point performance compiler optimizations that are expected to be default in upcoming releases. (Introduced in 5.0 update 6.) 打開性能編譯器優化（在5.0引入升級到6.0）
-XX:CompileThreshold=10000	Number of method invocations/branches before compiling [-client: 1,500] 編譯前方法調用/分支的數目【-client默認是1500】
-XX:LargePageSizeInBytes=4m	Sets the large page size used for the Java heap. (Introduced in 1.4.0 update 1.) [amd64: 2m.] 設置用於Java堆的最大頁的尺寸
-XX:MaxHeapFreeRatio=70	Maximum percentage of heap free after GC to avoid shrinking. 爲了不重疊，GC後最大空閒的堆的最大百分比。
-XX:MaxNewSize=size	Maximum size of new generation (in bytes). Since 1.4, MaxNewSize is computed as a function of NewRatio. [1.3.1 Sparc: 32m; 1.3.1 x86: 2.5m.] 新生代的最大尺寸。從1.4開始，MaxNewSize由NewRatio的函數計算而來。
-XX:MaxPermSize=64m	Size of the Permanent Generation.  [5.0 and newer: 64 bit VMs are scaled 30% larger; 1.4 amd64: 96m; 1.3.1 -client: 32m.] 永久生代的尺寸。
-XX:MinHeapFreeRatio=40	Minimum percentage of heap free after GC to avoid expansion. 爲了不擴張，GC後最小空閒堆的百分比。
-XX:NewRatio=2	Ratio of new/old generation sizes. [Sparc -client: 8; x86 -server: 8; x86 -client: 12.]-client: 4 (1.3) 8 (1.3.1+), x86: 12] 新生代/老生代的比分比。
-XX:NewSize=2.125m	Default size of new generation (in bytes) [5.0 and newer: 64 bit VMs are scaled 30% larger; x86: 1m; x86, 5.0 and older: 640k] 默認的新生代大小。
-XX:ReservedCodeCacheSize=32m	Reserved code cache size (in bytes) - maximum code cache size. [Solaris 64-bit, amd64, and -server x86: 48m; in 1.5.0_06 and earlier, Solaris 64-bit and and64: 1024m.] 保留的代碼緩存大小-最大的代碼緩存大小
-XX:SurvivorRatio=8	Ratio of eden/survivor space size [Solaris amd64: 6; Sparc in 1.3.1: 25; other Solaris platforms in 5.0 and earlier: 32] 銷燬/保留的空間比例
-XX:TargetSurvivorRatio=50	Desired percentage of survivor space used after scavenge. 清除後指望的保留空間比率
-XX:ThreadStackSize=512	Thread Stack Size (in Kbytes). (0 means use default stack size) [Sparc: 512; Solaris x86: 320 (was 256 prior in 5.0 and earlier); Sparc 64 bit: 1024; Linux amd64: 1024 (was 0 in 5.0 and earlier); all others 0.] 線程棧大小
-XX:+UseBiasedLocking	Enable biased locking. For more details, see this tuning example. (Introduced in 5.0 update 6.) [5.0: false] 使用偏鎖
-XX:+UseFastAccessorMethods	Use optimized versions of Get<Primitive>Field. 使用優化版本的Get<Primitive>方法。
-XX:-UseISM	Use Intimate Shared Memory. [Not accepted for non-Solaris platforms.] For details, see Intimate Shared Memory. 使用親密共享空間【對非solaris平臺無效】
-XX:+UseLargePages	Use large page memory. (Introduced in 5.0 update 5.) For details, see Java Support for Large Memory Pages. 使用large page memory
-XX:+UseMPSS	Use Multiple Page Size Support w/4mb pages for the heap. Do not use with ISM as this replaces the need for ISM. (Introduced in 1.4.0 update 1, Relevant to Solaris 9 and newer.) [1.4.1 and earlier: false] 使用Multiple Page Size Support
-XX:+UseStringCache	Enables caching of commonly allocated strings.  使用經常使用字符串緩存
-XX:AllocatePrefetchLines=1	Number of cache lines to load after the last object allocation using prefetch instructions generated in JIT compiled code. Default values are 1 if the last allocated object was an instance and 3 if it was an array. 用預取指令分配一個對象，緩存代碼的行數。缺省是1，數組是3.
-XX:AllocatePrefetchStyle=1	Generated code style for prefetch instructions. 0 - no prefetch instructions are generate*d*, 1 - execute prefetch instructions after each allocation, 2 - use TLAB allocation watermark pointer to gate when prefetch instructions are executed. 預取指令的產生代碼風格： 0-沒有預取指令， 1-每一次分配內存就執行預取指令， 2-當執行預取代碼指令時，用TLAB分配水印指針指向門。
-XX:+UseCompressedStrings	Use a byte[] for Strings which can be represented as pure ASCII. (Introduced in Java 6 Update 21 Performance Release) 用byte[] 代替字符串（從Java6開始引入）
-XX:+OptimizeStringConcat	Optimize String concatenation operations where possible. (Introduced in Java 6 Update 20) 可能的話優化字符串鏈接操做（從Java6引入）

 

Debugging Options（dubug參數）

 

Option and Default Value Description

 

-XX:-CITime	Prints time spent in JIT Compiler. (Introduced in 1.4.0.) 打印JIT編譯器花費的時間（從1.4.0引入）
-XX:ErrorFile=./hs_err_pid<pid>.log	If an error occurs, save the error data to this file. (Introduced in 6.) 錯誤發生時，把錯誤保存到一個指定文件。
-XX:-ExtendedDTraceProbes	Enable performance-impacting dtrace probes. (Introduced in 6. Relevant to Solaris only.) 啓用performance-impacting dtrace跟蹤（從6.0引入，只在solaris有效）
-XX:HeapDumpPath=./java_pid<pid>.hprof	Path to directory or filename for heap dump. Manageable. (Introduced in 1.4.2 update 12, 5.0 update 7.) 堆dump文件的存放目錄。（從1.4.2引入）
-XX:-HeapDumpOnOutOfMemoryError	Dump heap to file when java.lang.OutOfMemoryError is thrown.Manageable. (Introduced in 1.4.2 update 12, 5.0 update 7.) 當拋出異常java.lang.OutOfMemoryError 時，Dump heap 到文件。（從1.4.2引入）
-XX:OnError="<cmd args>;<cmd args>"	Run user-defined commands on fatal error. (Introduced in 1.4.2 update 9.) 在致命錯誤發生時運行用戶定義命令（從1.4.2引入）
-XX:OnOutOfMemoryError="<cmd args>;  <cmd args>"	Run user-defined commands when an OutOfMemoryError is first thrown. (Introduced in 1.4.2 update 12, 6) 運行用戶定義命令當一個OutOfMemoryError 異常拋出時。 （從1.4.2引入）
-XX:-PrintClassHistogram	Print a histogram of class instances on Ctrl-Break. Manageable. (Introduced in 1.4.2.) The jmap -histo command provides equivalent functionality. Ctrl-Break打印類實例的直方圖（從1.4.2引入）
-XX:-PrintConcurrentLocks	Print java.util.concurrent locks in Ctrl-Break thread dump.Manageable. (Introduced in 6.) The jstack -l command provides equivalent functionality. 打印java.util.concurrent 鎖
-XX:-PrintCommandLineFlags	Print flags that appeared on the command line. (Introduced in 5.0.) 打印在命令行中的標誌（從5.0引入）
-XX:-PrintCompilation	Print message when a method is compiled. 當方法被編譯時打印消息
-XX:-PrintGC	Print messages at garbage collection. Manageable. 垃圾收集時打印消息
-XX:-PrintGCDetails	Print more details at garbage collection. Manageable. (Introduced in 1.4.0.) 垃圾收集時打印具體信息
-XX:-PrintGCTimeStamps	Print timestamps at garbage collection. Manageable (Introduced in 1.4.0.) 垃圾收集時打印時間戳（從1.40引入）
-XX:-PrintTenuringDistribution	Print tenuring age information. 打印任期年紀信息
-XX:-TraceClassLoading	Trace loading of classes. 跟蹤正在加載的類
-XX:-TraceClassLoadingPreorder	Trace all classes loaded in order referenced (not loaded). (Introduced in 1.4.2.) 按順序跟蹤全部已經加載的類（從1.4.2引入）
-XX:-TraceClassResolution	Trace constant pool resolutions. (Introduced in 1.4.2.) 跟蹤常量池分辨率（從1.4.2引入）
-XX:-TraceClassUnloading	Trace unloading of classes. 跟蹤正在上傳的類
-XX:-TraceLoaderConstraints	Trace recording of loader constraints. (Introduced in 6.) 跟蹤加載器的限制記錄（從6.0引入）
-XX:+PerfSaveDataToFile	Saves jvmstat binary data on exit. 退出時保存jvmstat二進值數據
-XX:ParallelGCThreads=	Sets the number of garbage collection threads in the young and old parallel garbage collectors. The default value varies with the platform on which the JVM is running. 設置在青年和老年並行垃圾收集程序的收集線程的數目，缺省值根據JVM運行的平臺變化而變化。
-XX:+UseCompressedOops	Enables the use of compressed pointers (object references represented as 32 bit offsets instead of 64-bit pointers) for optimized 64-bit performance with Java heap sizes less than 32gb. 使用compressed pointers
-XX:+AlwaysPreTouch	Pre-touch the Java heap during JVM initialization. Every page of the heap is thus demand-zeroed during initialization rather than incrementally during application execution. 當JVM初始化時預先對Java堆進行預先摸底
-XX:AllocatePrefetchDistance=	Sets the prefetch distance for object allocation. Memory about to be written with the value of new objects is prefetched into cache at this distance (in bytes) beyond the address of the last allocated object. Each Java thread has its own allocation point. The default value varies with the platform on which the JVM is running. 爲對象分配設置預取距離。
-XX:InlineSmallCode=	Inline a previously compiled method only if its generated native code size is less than this. The default value varies with the platform on which the JVM is running. 當生成本地代碼的大小小於給定的值時，內聯這個預編譯方法。
-XX:MaxInlineSize=35	Maximum bytecode size of a method to be inlined. 內聯一個方法的最大字節碼大小
-XX:FreqInlineSize=	Maximum bytecode size of a frequently executed method to be inlined. The default value varies with the platform on which the JVM is running. 常常執行方法內聯的最大字節大小
-XX:LoopUnrollLimit=	Unroll loop bodies with server compiler intermediate representation node count less than this value. The limit used by the server compiler is a function of this value, not the actual value. The default value varies with the platform on which the JVM is running. 表明節點數目小於給定值時打開循環體
-XX:InitialTenuringThreshold=7	Sets the initial tenuring threshold for use in adaptive GC sizing in the parallel young collector. The tenuring threshold is the number of times an object survives a young collection before being promoted to the old, or tenured, generation. 爲自適應GC設置保有年齡閥值。就是一個對象被升級到年老，中年的時代的次數。
-XX:MaxTenuringThreshold=	Sets the maximum tenuring threshold for use in adaptive GC sizing. The current largest value is 15. The default value is 15 for the parallel collector and is 4 for CMS. 設置最大年齡保有閥值。當前最大值是15.