Latest news

NEW: JULY NEWSLETTER

• We list all the latest Java performance related news and articles
  • "If you have any ideas for Java performance related tool categories, please do suggest them to me so that I can catalogue them and add a page on them"
• All the latest Java performance tips extracted in concise form
  • "When using memory mapped files, your performance is at in-memory speeds as long as the memory mapped segments you are working on fit in memory. Once you go outside this area the OS needs to page out and in the pages you are addressing, so there is IO overhead. This is still highly efficient if you need to address more memory than you have available in RAM, but you should be aware of the tradeoff"

JUNE NEWSLETTER

• We list all the latest Java performance related news and articles
  • "Please help me organise the over 700 Java performance tools I've referenced over the years"
• All the latest Java performance tips extracted in concise form
  • "A sequence of Stream operations (called a pipeline) allows you to pass only one result from each step on to the next stage of the pipeline. If you want to pass multiple results, you must pass them as an object, but creating an object for the result of each individual comparison would hurt the performance of a stream approach compared to chunked approaches. Streams let's you handle this case efficiently by alowing you to pass a mutable intermediate container object which gets executed for each element. "

MAY NEWSLETTER

• We list all the latest Java performance related news and articles
  • "I have the distinct impression that the JavaSphere has gone into overdrive"
• All the latest Java performance tips extracted in concise form
  • "The main targets for tuning garbage collection are: 1) Modify the heap/permgen size; 2) Change the GC algorithm; 3) Configure the ratios between the memory regions"

APRIL NEWSLETTER

• We list all the latest Java performance related news and articles
  • "the tuning target isn't really 'make it as fast as I can'. It's actually 'make it as fast as I can within a reasonable effort'. Now while that's not an ideal performance target, it is a valid one"
• All the latest Java performance tips extracted in concise form
  • "GC characteristics you should optimize include: Stop-the-world pause time duration and frequency; CPU contention with the application; Heap fragmentation; GC memory overhead compared to application memory requirements"

MARCH NEWSLETTER

• We list all the latest Java performance related news and articles
  • "low latency tips are practices that people have found work - I won't call them 'best' practices because often they aren't. But generally the advice centered around the ones detailed here ..."
• All the latest Java performance tips extracted in concise form
  • "Off-heap memory storage is useful for low latency applications, to avoid GC overheads on that data; Low latency applications benefit from 'no-copy' implementations, where you avoid copying objects as much as possible, thus minimizing or even avoiding GC"

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.

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