Posts Tagged ‘ Capacity Planning ’

Significant Figures in R and Rounding

April 16, 2010
By
Significant Figures in R and Rounding

This is a follow-on to my previous post about determining significant digits, or sigdigs, in performance and capacity planning calculations. Once we know how to do that, inevitably we will be faced with rounding the result of a calculation to the least...

Read more »

Significant Figures in R and Info Zeros

April 11, 2010
By
Significant Figures in R and Info Zeros

The other day, I stumbled upon the signif function in R, so I thought I'd take a look at what it does and compare it with some results discussed in Chap. 3 "Damaging Digits in Capacity Calculations" of my GCaP book, viz., Example 3.5 on page 31. The m...

Read more »

Linux Server Profiling: Using Open Source Tools For Bottleneck Analysis

February 9, 2010
By

This tutorial covers profiling of Linux servers using open-source tools such as "iostat", "oprofile" and "blktrace". Both processor-bound and I/O-bound cases are covered, and the emphasis is on tools that provide visual displays of relevant metrics. Li...

Read more »

M. Edward (Ed) Borasky

January 21, 2010
By

Download "Getting Started with the Social Media Analytics Research Toolkit" (pdf, 1.25 megabytes) Download the Social Media Analytics Research Toolkit Media Inactivist, Thought Follower, Sit-Down Comic, Social Media Analytics Researcher, Former Boy Gen...

Read more »

Negative Scalability Coefficients in Excel

May 12, 2009
By
Negative Scalability Coefficients in Excel

Recently, several performance engineers, who have been applying my universal scalability law (USL) to their throughput measurements, reported a problem whereby their Excel spreadsheet calculations produced a negative value for the coherency parameter (...

Read more »

Rails, Scalability and Sexism

April 29, 2009
By

It’s been a long time since I posted here, for a number of reasons: Change of focus from Ruby programming to Linux capacity planning, especially in the realm of I/O subsystems. You’ll find more about that at http://linuxcapacityplanning.com...

Read more »

PDQ 5.0 is on the Launch Pad

April 4, 2009
By
PDQ 5.0 is on the Launch Pad

PDQ (Pretty Damn Quick) major release 5.0 is on the launch pad at Cape SourceForge. Because of a potential collision with the North Korean ICBM/satellite launch, we won't be filling the main liquid-hydrogen tank until next week (we don't want PDQ blame...

Read more »