[linuxtools-dev] RE: [dsdp-tcf-dev] Standard protocols/interfaces/format

["Spear, Aaron" <aaron_spear@xxxxxxxxxx>]

Hi Michel,

Thanks for the reply.  Is there anywhere that I can find any details of
using the TCF extensions for binary data?  I am very interested to
understand how it works and how efficient it is for streaming large
amounts of binary data.  I am also interested to understand the LTTng
specific usage of the binary protocol.  I saw the git repo with the
Linux agent side code to support this, but I could not seem to find a
java host side implementation of the binary TCF support, but I may not
have been looking in the right place.

Thanks!
Aaron  

> -----Original Message-----
> From: dsdp-tcf-dev-bounces@xxxxxxxxxxx 
> [mailto:dsdp-tcf-dev-bounces@xxxxxxxxxxx] On Behalf Of Michel Dagenais
> Sent: Tuesday, February 23, 2010 3:04 PM
> To: DSDP TCF dev list
> Cc: linuxtools-dev@xxxxxxxxxxx
> Subject: Re: [dsdp-tcf-dev] Standard 
> protocols/interfaces/formatsfor performance tools (TCF, LTTng, ...)
> 
> 
>  > The focus currently
> > is using real-time trace data as the event source for analysis.  In 
> > the future this will expand as we desire to be able to correlate 
> > analysis of heterogeneous systems, e.g. embedded Linux + 
> LTTng events 
> > on one machine, correlated with real-time trace data 
> collected from a 
> > bunch of DSP's.
> 
> A posteriori traces synchronization is an important problem 
> in such a setup. Benjamin Poirier contributed a very nice 
> procedure to synchronize traces in the latest LTTV.
> 
> > -What protocols are currently in use that we might consider as a 
> > starting point?  I see that the linuxtools project 
> apparently has one 
> > for transferring LTTng event data.  Are there any docs for this 
> > protocol?
> 
> We extended TCF (Michael Sills-Lavoie) to handle raw binary 
> data, offer zero copy transfer and accept plugin modules, and 
> we built a module to list and activate tracepoints. This has 
> been contributed and integrated into TCF and should be the 
> base for LTTng and Eclipse Linux Tools
> 
> > -file formats: event log file formats is another obvious 
> candidate for 
> > standardization.  Mentor has a file format we use that was 
> inspired by 
> > LTTng's format but is optimized for extremely large real-time trace 
> > logs.  I intend to throw this into the mix.  Any others we should 
> > think about? (The LTTng format obviously...)
> 
> A number of formats are optimized for system independance, 
> ease of parsing and other such considerations. However, for 
> something like extremely large traces, an XML type format is 
> obviously unsuitable. You want to minimize the overhead at 
> trace creation time and have something very compact. If you 
> have improvements over LTTng's format for very large traces, 
> we could look and take the best of both!
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