Comments
yourfanat wrote: I am using another tool for Oracle developers - dbForge Studio for Oracle. This IDE has lots of usefull features, among them: oracle designer, code competion and formatter, query builder, debugger, profiler, erxport/import, reports and many others. The latest version supports Oracle 12C. More information here.
Cloud Expo on Google News
SYS-CON.TV

2008 West
DIAMOND SPONSOR:
Data Direct
SOA, WOA and Cloud Computing: The New Frontier for Data Services
PLATINUM SPONSORS:
Red Hat
The Opening of Virtualization
GOLD SPONSORS:
Appsense
User Environment Management – The Third Layer of the Desktop
Cordys
Cloud Computing for Business Agility
EMC
CMIS: A Multi-Vendor Proposal for a Service-Based Content Management Interoperability Standard
Freedom OSS
Practical SOA” Max Yankelevich
Intel
Architecting an Enterprise Service Router (ESR) – A Cost-Effective Way to Scale SOA Across the Enterprise
Sensedia
Return on Assests: Bringing Visibility to your SOA Strategy
Symantec
Managing Hybrid Endpoint Environments
VMWare
Game-Changing Technology for Enterprise Clouds and Applications
Click For 2008 West
Event Webcasts

2008 West
PLATINUM SPONSORS:
Appcelerator
Get ‘Rich’ Quick: Rapid Prototyping for RIA with ZERO Server Code
Keynote Systems
Designing for and Managing Performance in the New Frontier of Rich Internet Applications
GOLD SPONSORS:
ICEsoft
How Can AJAX Improve Homeland Security?
Isomorphic
Beyond Widgets: What a RIA Platform Should Offer
Oracle
REAs: Rich Enterprise Applications
Click For 2008 Event Webcasts
WILS: Moore's Law + Application (Un)Scalability = Virtualization
Virtualization was inevitable.

One of the interesting side effects of having been a developer before migrating to a more network-focused view of the world* is it’s easier to understand the limitations and constraints posed on networking-based software, such as web servers.

During the early days of virtualization adoption, particularly related to efforts around architecting more scalable applications, VMware (and others) did a number of performance and capacity-related tests in 2010 that concluded “lots of little web servers” scale and perform better than a few “big” web servers.

Although virtualization overhead varies depending on the workload, the observed 16 percent performance degradation is an expected result when running the highly I/O‐intensive SPECweb2005 workload. But when we added the second processor, the performance difference between the two‐CPU native configuration and the virtual configuration that consisted of two virtual machines running in parallel quickly diminished to 9 percent. As we further increased the number of processors, the configuration using multiple virtual machines did not exhibit the scalability bottlenecks observed on the single native node, and the cumulative performance of the configuration with multiple virtual machines well exceeded the performance of a single native node.

-- “Consolidating Web Applications Using VMware Infrastructure” [PDF, VMware]

The primary reason for this is session management and the corresponding amount of memory required. Capacity is a simple case of being constrained by the size of the data required to store the session. Performance, however, is a matter of computer science (and lots of math). We could go through the Big O math of hash tables versus linked lists versus binary search trees, et al, but suffice to say that in general, most algorithmic performance degrades the larger N is (where N is the number of entries in the data store, regardless of the actual mechanism) with varying performance for inserts and lookups.

Thus, it is no surprise that for most web servers, hard-coded limitations on the maximum number of clients, threads, and connections exist. All these related to session management and have an impact on capacity as well as performance. One assumes the default limitations are those the developers, after extensive experience and testing, have determined provide the optimal amount of capacity without sacrificing performance.

It should be noted that these limitations do not scale along with Moore’s law. The speed of the CPU (or number of CPUs) does impact performance, but not necessarily capacity – because capacity is about sessions and longevity of sessions (which today is very long given our tendency toward Web 2.0 interactive, real-time refreshing applications).

This constraint does not, however, have any impact whatsoever on the growth of computing power and resources. Memory continues to grow as do the number of CPUs, cores, and speed with which instructions can be executed.

What the end result of this is that “scale up” is no longer really an option for increasing capacity of applications. Adding more CPUs or more memory exposes the reality of diminishing returns. The second 4GB of memory does not net you the same capacity in terms of users and/or connections as the first 4GB, because performance degrades in conjunction with increase in memory utilization. Again, we could go into the performance characteristics of the underlying algorithms where resizing and searching of core data structures becomes more and more expensive, but let’s leave that to those so inclined to dig into the math.

The result is it shouldn’t have been a surprise when research showed “lots of little web servers”, i.e. scale out, was better than “a few big web servers”, i.e. scale up.

Virtualization - or some solution similar that enabled operators to partition out the increasing amount of compute resources in such a way as to create “lots of little web servers” – was inevitable because networked applications simply do not scale along with Moore’s Law.

*A Master’s degree in Computer Science doesn’t hurt here, either, at least for understanding the performance of algorithms and their various limitations

Read the original blog entry...

About Lori MacVittie
Lori MacVittie is responsible for education and evangelism of application services available across F5’s entire product suite. Her role includes authorship of technical materials and participation in a number of community-based forums and industry standards organizations, among other efforts. MacVittie has extensive programming experience as an application architect, as well as network and systems development and administration expertise. Prior to joining F5, MacVittie was an award-winning Senior Technology Editor at Network Computing Magazine, where she conducted product research and evaluation focused on integration with application and network architectures, and authored articles on a variety of topics aimed at IT professionals. Her most recent area of focus included SOA-related products and architectures. She holds a B.S. in Information and Computing Science from the University of Wisconsin at Green Bay, and an M.S. in Computer Science from Nova Southeastern University.

Latest AJAXWorld RIA Stories
CloudEXPO | DevOpsSUMMIT | DXWorldEXPO Silicon Valley 2019 will cover all of these tools, with the most comprehensive program and with 222 rockstar speakers throughout our industry presenting 22 Keynotes and General Sessions, 250 Breakout Sessions along 10 Tracks, as well as our ...
Your job is mostly boring. Many of the IT operations tasks you perform on a day-to-day basis are repetitive and dull. Utilizing automation can improve your work life, automating away the drudgery and embracing the passion for technology that got you started in the first place. In...
Technological progress can be expressed as layers of abstraction - higher layers are built on top of lower layers treating them as abstract black boxes with known interfaces. A serverless approach represents an inflection point that entirely separates the runtime layer from the u...
Whenever a new technology hits the high points of hype, everyone starts talking about it like it will solve all their business problems. Blockchain is one of those technologies. According to Gartner's latest report on the hype cycle of emerging technologies, blockchain has just ...
Big Switch's mission is to disrupt the status quo of networking with order of magnitude improvements in network e ciency, intelligence and agility by delivering Next-Generation Data Center Networking. We enable data center transformation and accelerate business velocity by delive...
Subscribe to the World's Most Powerful Newsletters
Subscribe to Our Rss Feeds & Get Your SYS-CON News Live!
Click to Add our RSS Feeds to the Service of Your Choice:
Google Reader or Homepage Add to My Yahoo! Subscribe with Bloglines Subscribe in NewsGator Online
myFeedster Add to My AOL Subscribe in Rojo Add 'Hugg' to Newsburst from CNET News.com Kinja Digest View Additional SYS-CON Feeds
Publish Your Article! Please send it to editorial(at)sys-con.com!

Advertise on this site! Contact advertising(at)sys-con.com! 201 802-3021


SYS-CON Featured Whitepapers
Most Read This Week
ADS BY GOOGLE