Latest news

NEW: FEBRUARY NEWSLETTER

• We list all the latest Java performance related news and articles
  • "even if your program does almost no IO, that tiny IO operation it does gets queued up until the current flush completes, pausing your program"
• All the latest Java performance tips extracted in concise form
  • "Distributed caching requires cache updates to be propagated but this has overheads which in some situations can make the cache less effective than no cache"

JANUARY NEWSLETTER

• We list all the latest Java performance related news and articles
  • "volatile++ is not atomic, AtomicIntegerFieldUpdater.getAndIncrement(object) is"
• All the latest Java performance tips extracted in concise form
  • "When there is a large difference in retained memory between a parent and child object, this is a good candidate for the holder of a memory leak" and "Objects can be collected earlier than you might expect - the finalize() method can run when calls to other object methods are concurrently running!"

DECEMBER NEWSLETTER

• We list all the latest Java performance related news and articles
  • "you cannot possibly know what the biggest bottleneck is beforehand, you can only determine what it is using your various measuring tools, and these tools can mislead you"
• All the latest Java performance tips extracted in concise form
  • "final fields provide for thread-safety for primitives and also object references as long as the object referred to is immutable. If the referred object is mutable, you can still get thread-safe access and update as long as the mutability is handled in a thread-safe way (eg the example StringInterner class can have threads overwrite the internal data structure in a non-deterministic way, but the result of any call will still always produce a coherent object adhering to the class API. Specifically, the 'interned' String could be interned several times as different objects in different threads but this doesn't violate the class API)."

NOVEMBER NEWSLETTER

• We list all the latest Java performance related news and articles
  • "The advantage of a microservice architecture is that you only need to scale the services that need scaling, rather than all components"
• All the latest Java performance tips extracted in concise form
  • "The cloud is a new environment with it's own very specific challenges that need independent consideration for testing, monitoring and analysis - you can't just take the techniques you use on a server or browser or client application or mobile app and transfer those to cloud services, you actually have to use different techniques, it's a completely new environment class to add to those four: it has a server-like environment, but resource competition similar to a browser and mobile app type unpredictability of uptime."

OCTOBER NEWSLETTER

• We list all the latest Java performance related news and articles
  • "If you're interested in a little more about types of sizeof, or a little Java history (or both) then you might want to check my java.net blog"
• All the latest Java performance tips extracted in concise form
  • "In designing multithreaded components, you need to consider exactly how the component responds to interaction with other threads. Do you give hard or soft guarantees - for example the view of the size of a multithreaded collection depends on whether you want to be quick and just return the local thread's current impression of the collection size, or do you want to be thorough but slow and give the completely accurate size across all threads (which means suspending element additions and removals until the sizing operation completes! This is a design decision (not implementation), and has definite performance consenqences. It may be worth providing multiple methods, some with hard guarantees and others with soft guarantees so the developer can choose what is best for them."

SEPTEMBER NEWSLETTER

• We list all the latest Java performance related news and articles
  • "I look through all the Java sizeof implementations and choose the best"
• All the latest Java performance tips extracted in concise form
  • "There are two high level reasons for bottlenecks: a node has insufficient capacity (making other requests queue); A shared resource is too busy handling other nodes to provide the resource to a requesting node, making the node wait to acquire the shared resource."

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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