Posted by Coder.
Dec
4
Posted by Coder.
alanstange wrote:
Give the mustang builds a try. Many of the Math.* routines have been “intrinsified” for extra performance.Please try it and post the numbers comparing the 3 systmes (1.5, C++ and 1.6)Thanks much for this tip. I’m happy to say that the speedup for the Mustang server JVM is quite considerable. In one example with trig in the inner loop, the speed went up from 360K to 970 pixels/second. While I’m still far from the C++ speed, it’s a big …
Dec
3
Posted by Coder.
The most significant improvements in Eclipse TPTP 4.1 include:
Tool vendors can now build TPTP-based performance tools for applications in C/C++ and other compiled languages.
The TPTP data model has been expanded to support application performance data from non-Java applications, such as C/C++.
Web application testing capability has been demonstrated by integrating with other Eclipse technology.
TPTP 4.1 has integrated with the Eclipse Java Development Tools (JDT) and Web Tools Platform (WTP) projects …
Dec
3
Posted by Coder.
When tuning a database for better performance, one area to examine is the proximity of the database to the application. Can the database be located on the same server as the application? Will a database server located far away from the application server cause performance degradation? To answer these questions, a series of measurements were conducted to determine performance impact based on the distance between the application and database servers. This paper discusses the results of our tests.
IBM Redbooks | …
Nov
24
Posted by Coder.
Dong Xiao, product manager at Ashley Laurent, writes:
“How to not mess things up is the message of this article. In many cases it is not what you do that matters in achieving high performance, it is what you do NOT do. Here are half a dozen pitfalls to avoid that may just save you a bundle of time, and make you a hero.
Don’t overlook performance designs of target hardware platform and operating system.
Avoid context switching
Fine-tune task priority
Don’t do buffer copies …
Nov
19
Posted by Coder.
Slava Ocks, a developer working on SQL Server 2005 within Microsoft, reported similar problems in a blog posting earlier this month.”Our customers observed very interesting behaviour on high-end HT-enabled hardware. They noticed that in some cases when high load is applied SQL Server CPU usage increases significantly but SQL Server performance degrades,” wrote Ocks.Ocks then detailed testing which showed this behaviour where a system thread — in this case one cleaning out blocks of disk cache memory — is running …
Nov
14
Posted by Coder.
http://www.cerncourier.com/main/article/45/9/30
“Although chip performance keeps going up, and performance per dollar, too, performance per watt is stagnant. In other words, the total power consumed in data centres is rising. Worse, the operational costs of commercial data centres are almost directly proportional to how much power is consumed by the PCs. And unfortunately, a lot of that is wasted.”
…
“Ultimately, power consumption is likely to become the most critical cost factor for data-centre budgets, as energy prices continue to rise worldwide and concerns …
Oct
29
Posted by Coder.
Fast Infoset (FI) is an open, standards-based binary format for the efficient interchange of XML that is based on the XML Information Set (Infoset). In general, Fast Infoset can be used when it is necessary to retain the XML property of self-description (or the structure), and yet boost parsing speed and reduce document size.
Fast Infoset and the Pragmatic SOA Approach
Oct
11
Posted by Coder.
{disclaimer: I don’t work for IBM}
IBM has done it again. Yes, they’ve (quietly) released a beta of their JDK5.0 with a brand new version of the famed J9 VM — 2.3 to be exact. (Note: J9 VMs have been around since 1.4.1/2, but IBM’s been timid about it — eg. it wasn’t on by default). [As of this writing only Linux (AMD64, x86, powerpc) and AIX betas are available for download].
J9 (according to this presentation) is a Sun …
Jul
27
Posted by Coder.
Asked “What is Refactoring?” Martin Fowler answers “Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior.”
Cyrus Najmabadi (developer at Microsoft) writes on his blog Cyrus’ Blather, “… if you perform an “extract method” of some code that sits in a tight loop, and that the jit doesn’t inline, then you’ll have changed the external behavior with respect to its performance. However, there’s no good way …
Jul
12
Posted by Coder.
Notes from the Azul Systems’ (presented by Cliff Click) talk.
Java Performance Myths.
[In response to the comment about the original notes being a little too scant, I've decided to edit this entry. Sun will provide audio & slides, which I will link to once available.]
. I heard (or googled) that making fields or methods final (or private) will help performance (or it will allow more inlining).
…Wrong. With or without ‘final’ every inlinable methods is inlined by the runtime compilers.
. I heard …