http://dev.davidsoergel.com various computing projects Fri, 22 Aug 2008 23:01:29 +0000 http://backend.userland.com/rss092 en An aspect of testing Java programs that seems to me fairly neglected is testing conformance to interfaces, and (nearly identically) testing that functionality of abstract classes works properly in all concrete subclasses. Certainly this has been mentioned before, generally under the name Abstract Tests or Contract Tests. Also, ... http://dev.davidsoergel.com/2008/08/22/contract-tests-with-testng/ The problem In searching for a way to back up one of my Linux boxes to Amazon S3, I was surprised to find that none of the many backup methods and scripts I found on the net did what I wanted, so I wrote yet another one. The design requirements were: Occasional full ... http://dev.davidsoergel.com/2008/05/07/s3napback-cycling-incremental-compressed-encrypted-backups-to-amazon-s3/ The Symptoms I have two 3ware 8506-4 controllers with three disks each connected to them. I've been getting high iowait on my box whenever there's an even slightly disk-intensive task going on. The weird thing is that even processes that don't use the high-usage disk get stalled in iowait. ... http://dev.davidsoergel.com/2006/03/14/high-iowait-high-load-on-a-3ware-8506-4-solved/ My Powerbook G4 has been running way slow lately, and I finally have a little breathing room to address the problem. My impression is that a) my disk is really full, b) my disk is really fragmented, and c) this especially impacts virtual memory. So my solution is: Confirm that my ... http://dev.davidsoergel.com/2006/03/14/powerbook-performance-overhaul/