performanceGuru.com
This blog forms part of the http://performanceGuru.com website which focuses on performance tuning UNIX-like Operating Systems (including Linux).Wednesday, April 05, 2006
links for 2006-04-04
- The OpenVZ virtualization project yesterday announced that one of the key goodies that has been shipping in the commercialized Virtuozzo virtualization tool for Linux and Windows will be made available to the open source OpenVZ community. That feature, ca
- If you can't beat 'em, join 'em and emulate 'em. While Virtual Iron has some of the most sophisticated server virtualization technologies ever developed, what seems clear to most observers is that while VMware's closed source hypervisor inside its VMware
- It was only a year ago when the open source Xen hypervisor project took LinuxWorld by storm and suddenly became one of the most important open source projects ever launched and a key piece of the Linux software stack. At the time, the company behind the p
- What is Voice over IP really? What do you need for Voice over IP? What do you mean, I can't call my girlfriend? What's all that buzz about open and proprietary protocols? Can I start my own telecom service? This article addresses these questions and compa
- I rent a lot of cars. One reason for this is I travel a lot, mostly to conferences and meetings in other cities. Another reason is my own car, a late-80s Subaru wagon (the exact model year is a mystery not worth solving), can't be trusted on long trips. A
- Enterprise metaprogramming is becoming more common all the time as graphical and textual utilities make programming tasks easier and more descriptive, all because of the continuing formalization process occurring under the Object Management Group's Model
- I'm an art professor, and last semester I embarked on an exciting new adventure by erasing Mac OS X from nearly all of the Macintoshes in our digital media lab and installing Ubuntu in its place.
- Before going further about how Bayesian filters work, let’s take a look at the history and the theory behind Bayesianism. The Bayesian theory was named after Reverend Thomas Bayes, a renowned British mathematician who lived in the 18th century.
- As an IT professional, you need to have a structured mind to be able to think through all the different problematic situations that can present themselves to you on a day to day basis.
- So, after a week with the Niagara T2000, I’ve managed to find some time to do some more detailed benchmarks, and the results are very impressive. The T2000 is definitely an impressive piece of equipment, it seems very, very capable, and we may very well
- Desktop application virtualisation could quicken fixes, boost reliability and lower desktop support costs. Kevin White reports.
- The continuing opportunity presented by semiconductor technology trends characterized by Moore's Law also imposes significant challenges to processor, system, and software designers. The point of diminishing returns has been reached in the exploitation of
Tuesday, April 04, 2006
links for 2006-04-03
- APRIL 03, 2006 (COMPUTERWORLD) - Increasing power densities of networked storage, communications equipment and servers all contribute to the power and cooling problem. However, servers have become the biggest issue because server farms have grown so large
- The idea behind the Wikipedia, a collaborative, community-built encyclopedia, is being applied by a tools vendor for untangling system problems.
- Industrial Light & Magic found an innovative way to gain power efficiencies and reduce heat in some of its blade-server racks.
- Although group policies are an extremely powerful security mechanism, it can be a bit tricky to deploy them in an effective manner. That’s because the effective group policy is made up of multiple and sometimes contradictory group policy elements that a
- The Virtualisation Academy (vacademy™) is a unique establishment that is an initiative supported by all the major virtualisation vendors in the market today. It offers a FREE service to organisations wishing to evaluate the opportunities presented by ad
- THE COMMUNITY effort hosted by the Apache Software Foundation to create an open source, J2SE 5.0 compatible java runtime / virtual machine is progressing slowly but steadily. Despite some indifference and prejudice by some OSS pundits, the project has bee
- Improving the performance of your applications is rarely a wasted effort, but it's not always clear which functions the program is spending most of its execution time on. Learn how to pinpoint performance bottlenecks using gprof for both user-space and sy
- First, a little background on me: my PhD was one of the earliest on the automatic creation of optimizing compilers from formal machine descriptions ("Machine-Independent Generation of Optimal Local Code", CMU Computer Science Department, 1975). After my P
Monday, April 03, 2006
links for 2006-04-02
- "Computers are never fast enough." That used to be the mantra of computer users everywhere. Then, CPU manufacturers hit the 1GHz barrier and, for most users, it stopped being true. Unless you are playing the latest games, performing scientific computation
- MARCH 31, 2006 (PC WORLD) - The reorientation of hard drives has begun: The first drives to use perpendicular magnetic recording (PMR) technology to pack more data into less space are out. And our tests reveal that they not only boost storage capacity but
Friday, March 31, 2006
links for 2006-03-30
- The Fujitsu-Siemens partnership dabbed its toe into the market for Opteron-based servers last fall with a two-socket rack server and a blade server that made use of the HyperTransport interconnect to lash blades together into symmetric multiprocessing (SM
- Andrew Tridgell wandered over to our stand at LinuxWorld on Tuesday to ask about DTrace and look at some problems that he was having. We uploaded the source to one of his performance tests, built it and started to have a look. The test in question is lock
- Garbage collection is nearly everyone's favorite feature of the Java™ platform; it simplifies development and eliminates entire categories of potential code errors. But while garbage collection generally allows you to ignore resource management, sometim
- Learn about the tools available to develop your own multiscreen configuration and physical layout to enhance your computing experience. You can use Linux® and Xdmx to create one contiguous desktop across multiple display devices attached to separate comp
- Making your Web site attractive to search engines is a key factor for your success as a Web site developer. Get the basic information you need to organically optimize your Web site in this four-part series. In Part 1, you'll receive a foundation in search
- Making your Web site attractive to search engines is a key factor for your success as a Web site developer. Get the basic information you need to organically optimize your Web site in this four-part series. In Part 1, you learned the background of why whi
- Making your Web site attractive to search engines is a key factor for your success as a Web site developer. Get the basic information you need to organically optimize your Web site in this four-part series. In Part 3 of the series, you'll learn how to get
- Making your Web site obvious to search engines is a key factor for your success as a Web site developer. Get the basic information you need to organically optimize your Web site in this four-part series. In this final part of the series, learn specialized
- Want to start using Apache Derby right now? This multi-part series featured in the "Developing with Apache Derby: Hitting the Trifecta" column will get you up and running with the Derby database in no time. This first installment introduces the basic conc
- TOGAF provides architects a methodology for gaining control over enterprise architecture and IT. Learn about this important industry standard.
- To meet real-world business commitments, gathering detailed statistics of the transactions in your environment can be critical. Learn how you can set up end-to-end performance monitoring in a functional IBM Enterprise Workload Manager (EWLM) domain and se
- Today's business applications rarely live in isolation. They need to be connected in order to create an integrated solution from which an organization can derive value. Service-Oriented Architecture (SOA) and Event-Driven Architecture (EDA) are two differ
- Imagine being able to reboot a server from the system console from Europe or at an airport during a layover. Imagine not having to physically be present at your datacenter to perform tasks that require console access but, instead, doing them in the comfor
- This article will cover some of the more common design criteria and best practices you should consider when designing and acquiring a console infrastructure. Console servers, although little known outside the datacenter, provide key services to quick reco
- Linux distributor Red Hat Inc is likely to introduce a new edition to its Enterprise Linux product family to allow the operating system to be competitively priced when hosted in virtualized environments.
Thursday, March 30, 2006
links for 2006-03-29
- In an increasingly competitive global environment, enterprises are under extreme pressure to reduce operating costs. At the same time they must have the agility to respond to business opportunities offered by volatile markets. Leveraging IT for competitiv
- For desktop users, monitoring resource usage is an important task. By doing this, we can locate system bottleneck, planning what to do to optimize our system, identifying memory leak and so on. The problem is, which software one should use and how to use
- MARCH 29, 2006 (COMPUTERWORLD) - In my last column, I walked through the basic areas that a service provider’s service-level agreement should cover: the service summary, security and design reviews, hardware, software, service availability, service requ
- What follows is my personal evaluation and comparison of many popular programming languages. It is intended to provide very high-level information about the respective languages to anyone who is trying to decide which language(s) to learn or to use for a
- KProf is a visual tool for developers, which displays the execution profiling output generated by code profilers. The output of profilers being usually difficult to read (beyond the flat profile information), KProf presents the information in list- or tre
- The Fujitsu-Siemens partnership dabbed its toe into the market for Opteron-based servers last fall with a two-socket rack server and a blade server that made use of the HyperTransport interconnect to lash blades together into symmetric multiprocessing (SM
Wednesday, March 29, 2006
links for 2006-03-28
- MARCH 27, 2006 (COMPUTERWORLD) - These downloadable PowerPoint slides offer statistics on stored data encryption, storage market leaders and storage administrator salaries. A part of Computerworld's special reports and Knowledge Centers, Data Points are a
- MARCH 27, 2006 (COMPUTERWORLD) - The Enterprise Grid Alliance (EGA) today released its data and storage provisioning requirements for enterprise grids as part of its ongoing effort to foster development of interoperable grid products and best practices.
- If you're edgy about security for your SOHO LAN, you might want to consider moving your first line of defense out past your firewall. How about on your router, for example? If your router runs OpenWrt, you can do exactly that, by running Snort, the open s
- Open source software makes podcasting easy -- too easy. Listening to a playlist of first-timer podcasts can leave your ears ringing from sudden changes in playback volume. The problem is audio mastering. Recording sound is simple, but mastering that sound
- While the X86 world hops from one to two processing cores, startup Azul Systems plans to integrate 48 cores on its second-generation Vega chip, expected next year.
- Sun Microsystems is trying to use a variation of its Sun Grid to get a foothold in the online gaming industry. The Santa Clara, Calif.-based server and software company started sharing details about its Project Darkstar at the Game Developer Conference la
- This tutorial shows how to configure a MySQL 5 cluster with three nodes: two storage nodes and one management node. This cluster is load-balanced by a high-availability load balancer that in fact has two nodes that use the Ultra Monkey package that provid
- This guide is to show you how to edit your iptables if you're running on a server This guide info came from iptables rocks, but i edited a bunch of data to make it suitable for what i want it to do
Tuesday, March 28, 2006
links for 2006-03-27
- Just as BPM (business process management) technology is markedly different from conventional approaches to application support, the methodology of BPM development is markedly different from traditional software implementation techniques. With CPI (continu
- There has never been a better time to increase memory capacity. Consider that the increased use of memory-intensive applications such as video encoders has already caused 1 GB configurations to go mainstream.
- In part 3 of this series, we take a closer look at a cluster-based text-file analysis utility that has been implemented using both the Message Passing Interface (MPI) system and the Parallel Virtual Machine (PVM) library. The utility is a simple cluster a
- Software engineering issues notwithstanding, the migration to 64-bit architectures poses new challenges in the linguistic domain as well. Join me in a brief lesson in memory storage jargon, the interesting etymology behind it and -- a pinch of Greek.
- The first phase of designing a parallel algorithm consists of analyzing the problem to identify exploitable concurrency, usually by using the patterns of the Finding Concurrency design space.
- The software development process now requires a working knowledge of parallel and distributed programming. The requirement for a piece of software to work properly over the Internet, on an intranet, or over some network is almost universal.
- THE SON of the Alpha EV7 bus, also known as Hypertransport these days, aimed to provide for very versatile functionality from Day One. That's whether we talk about cache-coherent NUMA-like SMP (but without most of NUMA latency penalties), or high-performa
- "Adaptive supercomputing will cause a paradigm shift in the way users select and use HPC systems. Adaptive supercomputing is necessary to support the future needs of HPC users as their need for higher performance on more complex applications outpaces Moor
- As a number of large-scale, multinational experiments prepare to go online in the next 2-3 years, a new generation of data retrieval and transmission techniques and tools will be required. The data yielded by these experiments will be prolific, and a dive
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