Greg is the co-founder and CTO of Undo. He is a coder at heart, but likes to bridge the gap between the business and software worlds. (Sadly, these days most of Greg’s coding is done on aeroplanes.)
Greg has 20 years’ experience in the software industry and has held development and management roles at companies including the pioneering British computer firm Acorn, as well as fast-growing start ups, NexWave and Solarflare. It was at Acorn that Greg met Julian and on evenings and weekends, they invented the core technology that would eventually become Live Recorder.
Greg holds a PhD from City University, London and was nominated for the 2001 British Computer Society Distinguished Dissertation Award. He lives in Cambridge, UK with his wife and two children and in his spare time, catches up on email.
Testing and debugging using record & replay technology
How do you go about testing a complex feature-rich multi-threaded application of highly optimised C/C++ code that is SAP HANA? A huge code base, non-deterministic factors, continuous integration and more advanced testing methodologies lead to a growing number of intermittent test failures which are often difficult to reproduce and investigate. Worryingly, these sporadic failures are building up over time, like a pile of dirty laundry nobody wants to talk about…
The SAP HANA engineering team spent months analysing logs from failed tests – often with no success. Eventually, they tried a new method: recording test failures and replaying the recording files in a reversible debugger in order to see exactly what the HANA software did.
This short talk will explore how the SAP HANA engineering team managed to catch and fix sporadic memory leaks and race conditions … before they reached customers. Their true commitment to software quality is a big part of why they are leading the field in the in-memory revolution.