JOpt Simple - a Java command line parsing library - JOpt Simple
JOpt Simple is a Java library for parsing command line options, such as those you might pass to an invocation of javac. In the interest of striving for simplicity, as closely as possible JOpt Simple attempts to honor the command line option syntaxes of POSIX getopt() and GNU getopt_long(). It also aims to make option parser configuration and retrieval of options and their arguments simple and expr
JCommander
JCommander is a very small Java framework that makes it trivial to parse command line parameters. You annotate fields with descriptions of your options: import com.beust.jcommander.Parameter; public class Args { @Parameter private List<String> parameters = new ArrayList<>(); @Parameter(names = { "-log", "-verbose" }, description = "Level of verbosity") private Integer verbose = 1; @Parameter(names
String Deduplication - A new feature in Java 8 Update 20
Strings consume a lot of memory in any application. Especially the char[] containing the individual UTF-16 characters is contributing to most of the memory consumption of a JVM by each character eating up two bytes. It is not uncommon to find 30% of the memory consumed by Strings, because not only are Strings the best format to interact with humans, but also popular HTTP APIs use lots of Strings.
HotSpot JVM garbage collection options cheat sheet (v3)
Updated version is available! Two years ago I have published cheat sheet for garbage collection options in HotSpot JVM. Recently I decided give that work some refreshing and today I'm publishing first HostSpot JVM options ref card covering generic GC options and CMS tuning. (G1 have got a plenty of tuning options during last two years so it will have dedicated ref card). Content-wise GC log rotati
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GC ãƒã‚°ã«é–¢ã‚ã‚‹ JVM コマンドラインオプションã¾ã¨ã‚ - ç†ç³»å¦ç”Ÿæ—¥è¨˜
Full GC ã«ã‚ˆã‚‹ Stop the World ã§ã‚µãƒ¼ãƒãŒåœæ¢çŠ¶æ…‹ã«â€¦ã€ãã‚“ãªã¨ãã«èª¿æŸ»ã®åŠ©ã‘ã«ãªã‚‹ã®ãŒ GC ã®ãƒã‚°ã€‚Permanent é ˜åŸŸãŒæº¢ã‚Œã¦ã„ã‚‹ã®ã‹ã€Java Heap ãŒæº¢ã‚Œã¦ã„ã‚‹ã®ã‹ã€Heap ãŒæº¢ã‚Œã¦ã„ã‚‹ã®ãªã‚‰ä½•ã®ã‚ªãƒ–ジェクトãŒæº¢ã‚Œã¦ã„ã‚‹ã®ã‹ã€ãƒ¡ãƒ¢ãƒªãƒªãƒ¼ã‚¯ãŒç™ºç”Ÿã—ã¦ã„ã‚‹ã®ã‹ã€‚ãã‚ŒãŒåˆ†ã‹ã‚‰ãªã„ã¨ä½•æ°—ã«å¯¾å‡¦ã®ã—よã†ãŒãªã„。 ãŸã ã€ã“ã® GC ã®ãƒã‚°ã€ãã‚Œãªã‚Šã®è¨å®šã‚’ã—ã¦ãŠã‹ãªã„ã¨è§£æžã«è€ãˆãªã„ã—å½¹ã«ç«‹ãŸãªã„。役ã«ç«‹ãŸãªã„ãƒã‚°å‡ºåŠ›ã¯ãƒ‡ã‚£ã‚¹ã‚¯å®¹é‡ã‚’圧迫ã™ã‚‹ã‚´ãƒŸã«ãªã‚‹ã€‚ãã†ã„ã†æ„Ÿã˜ã®ãƒã‚°ã‚’ç›®ã«ã—ã¦ã€ãªã‚“ã¨ã‹ãªã‚‰ã‚“ã‚‚ã‚“ã‹ãªãƒ¼ã€ãªã‚“ã¨ã‹ã›ãã°ãªãƒ¼ã¨æ¤œè¨Žã—ã¦ãŠã‚Šã€Oracle ã®ãƒšãƒ¼ã‚¸ã‹ã‚‰ãã‚Œã£ã½ã„オプションを調ã¹ã¦ã¿ã¦ã‚‹ã€‚ Java HotSpot VM Options 当然ãªãŒã‚‰ã€ŒOracle ã®ãƒšãƒ¼ã‚¸ã€ã¨æ›¸ã„ã¦ã‚るよã†ã«ã€Oracle ã® JVM ãŒå¯¾è±¡ã§ã‚ã£ã¦ã€ä»–ã® JVM
HotSpot JVM garbage collection options cheat sheet (v2)
In this article I have collected a list of options related to GC tuning in JVM. This is not a comprehensive list, I have only collected options which I use in practice (or at least understand why I may want to use them). Compared to previous version a few useful diagnostic options was added. Additionally section for G1 specific options was introduced. PDF version
Useful JVM Flags - Part 7 (CMS Collector)
The Concurrent Mark Sweep Collector (“CMS Collectorâ€) of the HotSpot JVM has one primary goal: low application pause times. This goal is important for most interactive applications like web applications. Before we take a look at the relevant JVM flags, let us briefly recap the operation of the CMS Collector and the main challenges that may arise when using it. Just like the Throughput Collector (s
Java 7 CMS GCã®åŸºæœ¬çš„ãªæƒ…å ±ã®æ•´ç† - nekop's blog
ãƒãƒƒãƒå‡¦ç†ãªã©ã‚¹ãƒ«ãƒ¼ãƒ—ットé‡è¦–ã®ã‚¢ãƒ—リケーションã¯ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã®ãƒ‘ラレルGCã§è‰¯ã„ãŒã€Java EEアプリケーションサーãƒãªã©ãƒ¬ã‚¹ãƒãƒ³ã‚¹ã‚¿ã‚¤ãƒ é‡è¦–ã®ã‚‚ã®ã‚„Hadoopãªã©ã®ã‚¯ãƒ©ã‚¹ã‚¿ç³»ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã§æ»æ´»ç›£è¦–ã«å¼•ã£æŽ›ã‚‹ç³»ãªã©ã®stop the worldã‚’ãªã‚‹ã¹ãé¿ã‘ãŸã„ã„ã‚ゆるサーãƒç³»ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã‚’é‹ç”¨ã™ã‚‹å ´åˆã«ã¯ã€UseConcMarkSweepGCを付与ã—ã¦åœæ¢æ™‚é–“ã®çŸã„CMS GCを使ã†ã€‚ãã®å ´åˆã«CMSã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã«è¸ã¿è¾¼ã‚‚ã†ã¨ã™ã‚‹ã¨ãªã‚“ã ã‹é›£ã—ã„記述ãŒã„ã£ã±ã„ã§è‹¥å¹²å›°ã‚‹ã®ã§ã€ç°¡å˜ãªã‚¬ã‚¤ãƒ‰ã‚’メモã¨ã—ã¦æ›¸ã„ã¦ãŠã。 対象ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯ä»¥ä¸‹ã€‚ $ java -version java version "1.7.0_51" OpenJDK Runtime Environment (fedora-2.4.5.1.fc20-x86_64 u51-b31) OpenJDK 64-Bit Serve
The most complete list of -XX options for Java JVM
There was a wonderful page with that list (http://www.md.pp.ru/~eu/jdk6options.html), but it seems it's gone now and not available any more. Luckily there is http://web.archive.org which allows to make time flowing backwards and recover things which have passed away long time back. So, I have just get that page out of grave and copy/pasted here to return that bit of information back to life. Also
List of Chromium Command Line Switches « Peter Beverloo
There are lots of command lines which can be used with the Google Chrome browser. Some change behavior of features, others are for debugging or experimenting. This page lists the available switches including their conditions and descriptions. Last automated update occurred on 2024-12-08. Condition Explanation
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kotlin/K2JVMCompilerArguments.java at master · JetBrains/kotlin · GitHub
https://argparse4j.sourceforge.net/
GitHub - kohsuke/args4j: args4j
Useful JVM Flags - Part 6 (Throughput Collector)
GitHub - yargs/yargs: yargs the modern, pirate-themed successor to optimist.
GitHub - romanoff/gofh: Go flags handler
GitHub - ogier/pflag: Drop-in replacement for Go's flag package, implementing POSIX/GNU-style --flags.
jteeuwen/go-pkg-optarg · GitHub
jessevdk/go-flags: go command line option parser
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