Hello everyone, my name is Marios Kogias and I was a Google Summer of Code student working on LTTng this summer under the supervision of Jeremie Galarneau. In my work I created a tracing infrastructure backed by LTTng that implements the Google's Dapper tracing semantics[1] and is specially designed for low-overhead applications. Its purpose is to depict the causal relationships between the different software layers that a distributed application may have.
To do that I had to implement an instrumentation library which which wraps LTTng tracepoints and helps the user to instrument C/C++ applications. This information can be visualized using Twitter's Zipkin[3]. So, I created a pair of Babeltrace plugins to send the aggregated information to a Scribe server[2]. One of my babeltrace plugins sends the tracing data created by applications instrumented with my library to a Zipkin instance. A prototype of this work can be found here: https://github.com/marioskogias/blkin However, one major thing missing from the above repo is the live tracing support, which during the GSOC was implemented in a really hackish way. I plan to extend the project when the new plugins systems is available. Then, I intend to create probably a Python package for the plugins which will have live tracing support as well. Finally, I need to add that I used this infrastructure to trace Ceph RADOS. After this attempt I am in close contact with the Ceph community since they liked my approach and want to merge BlkKin into their master branch for their RADOS tracing support. So, they also expect the next step in this project. I am writing here to make my work public and state my intention to continue working on that until it is something complete and stable. [1] http://research.google.com/pubs/pub36356.html [2]https://github.com/facebookarchive/scribe [3]http://twitter.github.io/zipkin/ _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
