Excellent. Thanks for releasing this code. Stef
> I announce the first availability of the Jejak trace framework at > > http://ss3.gemstone.com/ss/Jejak.html > > During the VALMADEO project (a PRIR/Région Bretagne funded project directed > by C. Dezan, <de...@univ-brest.fr>), we needed a tool to study in detail how > some algorithms (error correcting codes) could work without errors, but with > degraded performance. Execution and compilation would report no errors, but > the performance of the error correcting coding and decoding would be several > dB below the target. The error correcting code was looping hundreds of times > over each block of data, making step by step debugging unusable. Profiling, > message tallies were too coarse to tell us anything. We needed a different > tool. > > The answer was this trace tool : a framework for injecting probes into > methods, and record their execution. It can record an execution to the > smallest detail (all calls, all values, all assignments), that over a long > sequence (hundreds or thousands of calls), and let one navigate freely > through the recorded trace along with the traced source code. It is capable > of tracing system, startup or display methods, without interruption or > blocking the overall image, allowing for very fine non-intrusive system > analysis. > > It has been used for debugging turbo codes implementations, algorithm > understanding on turbo codes, and memory behaviour analysis for embedded > systems design space exploration. > > It requires The Opal compiler and is integrated with OmniBrowser, and is > tested in a Pharo 1.4 image. Instructions for loading are : > > Gofer it > squeaksource: 'MetacelloRepository'; > package: 'ConfigurationOfOmniBrowser'; > load. > > (ConfigurationOfOmniBrowser > project version: #stable) load: #( 'Dev' 'Dev Tests'). > > Gofer new > url: 'http://smalltalkhub.com/mc/MarcusDenker/Opal/main'; > package:'ConfigurationOfOpalCompiler'; > load. > > (Smalltalk at: #ConfigurationOfOpalCompiler) load. > > Gofer new > repository: 'http://ss3.gemstone.com/ss/Jejak'; > load > > There is a lot left to be done (better event logging, out of image logging, > performance issues), but, as it is, it can be used for tracing almost any > code in the image, even ones which may lock-up the image when halted (beware > : bugs in the tracer may still lock or crash the image). It is also a very > pedagogic way of seeing a full execution through a set of methods. > > Thierry > -- > Thierry Goubier > CEA list > Laboratoire des Fondations des Systèmes Temps Réel Embarqués > 91191 Gif sur Yvette Cedex > France > Phone/Fax: +33 (0) 1 69 08 32 92 / 83 95 > >
