Sunday, April 22, 2018

The Geometry of Latency

... AKA hyperbolae.

Here's a mnemonic tabulation based on dishes and bowls:

Hopefully this makes amends for the more complicated explanation I wrote for CMG back in 2009 entitled: "Mind Your Knees and Queues: Responding to Hyperbole with Hyperbolæ", which I'm pretty sure almost nobody understood.

Saturday, April 21, 2018

Virtual cloudXchange 2018 Conference

Our abstract has been accepted for presentation at the first CMG cloudXchange Virtual Conference to be held on June 19, 2018.

Exposing the Cost of Performance
Hidden in the Cloud


Neil Gunther
Performance Dynamics, Castro Valley, California

Mohit Chawla
Independent Systems Engineer, Hamburg, Germany

Whilst offering versatile elastic capacity, the cloud also reintroduces an old mainframe concept—chargeback—which rejuvenates the need for performance analysis and capacity planning. Combining production JMX data with an appropriate performance model, we show how to assess fee-based EC2 configurations for a mobile-user application running on a Linux-hosted Tomcat cluster. The performance model also facilitates ongoing cost-benefit analysis of different AWS Auto Scaling policies.