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ManageEngine
ManageEngine's Site24x7: End-to-End analysis on Java EE web transactions. Sign up for FREE!


JProfiler
Get rid of your performance problems and memory leaks!

Chart Java Jitter with jHiccup
Monitor and identify pauses in your Java apps. Download now

jKool real-time visualization SaaS
Analyze time-series data & get a free t-shirt!

Java Developers WANTED in London
Come and join the best cloud communications company


Latest news

NEW: JULY NEWSLETTER

  • We list all the latest Java performance related news and articles
    • "A tiny change in Java 8 is that Thread.stop(Throwable) is now disabled - it now throws an UnsupportedOperationException instead of working as it did in earlier Java versions. Thread.stop() still works (ie the stop() call with no argument)"
  • All the latest Java performance tips extracted in concise form
    • "Make sure everything is getting JIT compiled. A quick technique to check this is to switch on the -XX:+PrintCompilation flag, then redo with -XX:ReservedCodeCacheSize doubled and if more methods are getting compiled the second time, the code cache was too small"

JUNE NEWSLETTER

MAY NEWSLETTER

  • We list all the latest Java performance related news and articles
    • "In Java 8, Permgen disappeared, but Metaspace appeared. Metaspace has some of the same challenges - identifying classloader leaks will still be equally challenging. But instead of having a default maximum size as Permgen had, Metaspace is unlimited by default."
  • All the latest Java performance tips extracted in concise form
    • "In Java 8 java.util.logging.Logger methods accept a Supplier<String> (as an alternative to a String), which means that you can now pass a Supplier and the resulting code only gets evaluated when the log line is actually emitted - ie you get lazy evaluation and the log entry no longer needs to be guarded to avoid the string getting evaluated if the log level is insufficient to trigger the log line."

APRIL NEWSLETTER

  • We list all the latest Java performance related news and articles
    • "Optimal use of a shared resource is done by multiplexing where possible"
  • All the latest Java performance tips extracted in concise form
    • "A microservice with correctly bounded context is self-contained - you can understand and update the microservice's code without knowing anything about the internals of its peers; the microservices and its peers interact strictly through APIs and so don't share data structures, database schemata, or other internal representations. This allows you to focus on fixing a single bottleneck without impacting anything else in the system. "

MARCH NEWSLETTER

  • We list all the latest Java performance related news and articles
    • "if the majority of your requests need both microservice A and microservice B, and these two microservices both each need to scale to the same number of JVMs, there is no point at all in having those microservices running in separate JVMs - you may as well coalesce those microservices into the same JVM and gain the benefit of single JVM efficiency"
  • All the latest Java performance tips extracted in concise form
    • "For thread-safety you just have to follow one simple rule - no mutable state in the code. No instance variables and you are safe, regardless of how many threads execute the same piece of code"

FEBRUARY NEWSLETTER

JANUARY NEWSLETTER

Previous newsletters

All our previous newsletters can be viewed from here

How to use this site

This site has four main information resources:

  • The uncategorized tips page lists many other web pages with Java performance tuning related information. Each web page has its performance tuning tips extracted and listed immediately after the URL is listed. These tips are being categorized, and the tips page links to those categories currently available. If the performance area you are interested in is not yet categorized, send us an email from this page telling us the categorization you'd like to see. In any of the tips pages, use your browser's "find" or "search" option to identify particular tips you are interested in on the page, and follow up by reading the referenced web page if necessary or desired.
  • The resources page lists Java performance tuning resources including books, tools, reports, other performance tuning sites of interest, and Java performance tuning discussion groups.
  • The news pages are monthly newsletters listing any new Java performance tuning related information, together with Kirk Pepperdine's discussion group roundup and Javva The Hutt.
  • The tool reports pages are detailed introductory reports on various Java performance related tools, for both free and commercial tools.


This site has been designed to download almost as fast as possible. (Some stylistic markup and required server-side processing has been used in preference to absolute speed contraints.) The web tree contains very few graphics and almost no complex typesetting markup except for very simple tables, and the main pages can be accessed directly from the menu.

This line is only to help search engines: Java performance tuning Java tuning Java optimization Java optimize Java optimizing Java fast Java faster Java speedup Java performance Java High-Performance


Last Updated: 2015-07-29
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