Java Hot. Spot VM Options. Please note that this page only applies to JDK 7 and earlier releases. For JDK 8 please see the Windows, Solaris, Linux and Mac OS X reference pages. This document provides information on typical command- line options and environment variables that can affect the performance characteristics of the Java Hot. Spot Virtual Machine. Unless otherwise noted, all information in this document pertains to both the Java Hot. ![]() Spot Client VM and the Java Hot. Spot Server VM. Categories of Java Hot. Spot VM Options Standard options recognized by the Java Hot. Spot VM are described on the Java Application Launcher reference pages for Windows and Solaris & Linux. This document deals exclusively with non- standard options recognized by the Java Hot. Spot VM: Options that begin with - X are non- standard (not guaranteed to be supported on all VM implementations), and are subject to change without notice in subsequent releases of the JDK. ![]() Options that are specified with - XX are not stable and are subject to change without notice. Users of JDKs older than 1. Java Hot. Spot VM, should see Java Hot. Spot Equivalents of Exact VM flags. Some Useful - XX Options Default values are listed for Java SE 6 for Solaris Sparc with - server. Some options may vary per architecture/OS/JVM version. Platforms with a differing default value are listed in the description. Xx IntroFeminist history; History of feminism; History of American women; History of Canadian women; History of German women; History of women in the United Kingdom. AIDS 2014 Programme Programme-at-a-Glance The entire AIDS 2014 programme is available online through the Programme-at-a-Glance. You can view all conference sessions. Live wallpaper and daydream displaying the latest and greatest imagery from 500px.com, highly configurable. El siglo xx d. ![]() ![]() The official site for The xx. New Dates Announced - View All Upcoming Tour Dates. The latest issue of Augsburg Now magazine is available. Learn about current students and alumni. XXX Sex on XNXX.com - the #1 porn videos tube in the world! XNXX is a cloud host for free sex clips. XXX videos uploaded by amateurs who share their home made swinger. Directed by Roxanne Benjamin, Karyn Kusama, St. With Natalie Brown, Jonathan Watton, Peter DaCunha, Peyton Kennedy. Four short horror films that are directed. XX wiek w metodologii historii. Free pics of hardcore bisexual MMF sex from BIMAXX. Boolean options are turned on with - XX: +< option> and turned off with - XX: -< option>. Disa. Numeric options are set with - XX: < option> =< number>. Numbers can include 'm' or 'M' for megabytes, 'k' or 'K' for kilobytes, and 'g' or 'G' for gigabytes (for example, 3. String options are set with - XX: < option> =< string> , are usually used to specify a file, a path, or a list of commands. Xx Roman NumeralFlags marked as manageable are dynamically writeable through the JDK management interface (com. Hot. Spot. Diagnostic. MXBean API) and also through JConsole. In Monitoring and Managing Java SE 6 Platform Applications, Figure 3 shows an example. The manageable flags can also be set through jinfo - flag. The options below are loosely grouped into categories. Behavioral Options. Option and Default Value. Description- XX: -Allow. User. Signal. Handlers. Do not complain if the application installs signal handlers. Use - XX: +Disable. Explicit. GC to disable calls to System. Note that the JVM still performs garbage collection when necessary.- XX: +Fail. Over. To. Old. Verifier. Fail over to old verifier when the new type checker fails. Controls the maximum spin iterations allowed before entering operating system thread synchronization code. Relevant to Solaris only.)- XX: +Use. Bound. Threads. Bind user level threads to kernel threads. Relevant to Solaris only.)- XX: -Use. Parallel. GCUse parallel garbage collection for scavenges. Enabling this option automatically sets - XX: +Use. Parallel. GC. Relevant to Solaris only.)Back to Options Garbage First (G1) Garbage Collection Options. Option and Default Value. Description- XX: +Use. G1. GCUse the Garbage First (G1) Collector- XX: Max. GCPause. Millis=n. Sets a target for the maximum GC pause time. This is a soft goal, and the JVM will make its best effort to achieve it.- XX: Initiating. Heap. Occupancy. Percent=n. Percentage of the (entire) heap occupancy to start a concurrent GC cycle. It is used by GCs that trigger a concurrent GC cycle based on the occupancy of the entire heap, not just one of the generations (e. G1). A value of 0 denotes 'do constant GC cycles'. The default value is 4. XX: New. Ratio=n. Ratio of old/new generation sizes. The default value is 2.- XX: Survivor. Ratio=n. Ratio of eden/survivor space size. The default value is 8.- XX: Max. Tenuring. Threshold=n. Maximum value for tenuring threshold. The default value is 1. XX: Parallel. GCThreads=n. Sets the number of threads used during parallel phases of the garbage collectors. The default value varies with the platform on which the JVM is running.- XX: Conc. GCThreads=n. Number of threads concurrent garbage collectors will use. The default value varies with the platform on which the JVM is running.- XX: G1. Reserve. Percent=n. Sets the amount of heap that is reserved as a false ceiling to reduce the possibility of promotion failure. The default value is 1. XX: G1. Heap. Region. Size=n. With G1 the Java heap is subdivided into uniformly sized regions. This sets the size of the individual sub- divisions. The default value of this parameter is determined ergonomically based upon heap size. The minimum value is 1. Mb and the maximum value is 3. Mb. Back to Options Performance Options. Option and Default Value. Description- XX: +Aggressive. Opts. Turn on point performance compiler optimizations that are expected to be default in upcoming releases. Since 1. 4, Max. New. Size is computed as a function of New. Ratio. For more details, see this tuning example. Do not use with ISM as this replaces the need for ISM. Default values are 1 if the last allocated object was an instance and 3 if it was an array. Relevant to Solaris only.)- XX: Heap. Dump. Path=./java. Manageable.- XX: -Print. GCDetails. Print more details at garbage collection. Manageable (Introduced in 1. XX: -Print. Tenuring. Distribution. Print tenuring age information.- XX: -Print. Adaptive. Size. Policy. Enables printing of information about adaptive generation sizing.- XX: -Trace. Class. Loading. Trace loading of classes.- XX: -Trace. Class. Loading. Preorder. Trace all classes loaded in order referenced (not loaded). The default value varies with the platform on which the JVM is running.- XX: +Use. Compressed. Oops. Enables the use of compressed pointers (object references represented as 3. Java heap sizes less than 3. XX: +Always. Pre. Touch. 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.- XX: Allocate. Prefetch. Distance=n. 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.- XX: Inline. Small. Code=n. 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.- XX: Max. Inline. Size=3. 5Maximum bytecode size of a method to be inlined.- XX: Freq. Inline. Size=n. Maximum bytecode size of a frequently executed method to be inlined. The default value varies with the platform on which the JVM is running.- XX: Loop. Unroll. Limit=n. 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.- XX: Initial. Tenuring. Threshold=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.- XX: Max. Tenuring. Threshold=n. Sets the maximum tenuring threshold for use in adaptive GC sizing. The current largest value is 1. The default value is 1. CMS.- Xloggc: < filename> Log GC verbose output to specified file. The verbose output is controlled by the normal verbose GC flags.- XX: -Use. GCLog. File. Rotation. Enabled GC log rotation, requires - Xloggc.- XX: Number. Of. GClog. Files=1. Set the number of files to use when rotating logs, must be > = 1. The rotated log files will use the following naming scheme, < filename>. XX: GCLog. File. Size=8. KThe size of the log file at which point the log will be rotated, must be > = 8. K. Back to Options.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
November 2017
Categories |