Hi, I'm adding the LTTng mailing list in CC for the benefit of the community and so people add to or correct my explanation.
The CTF specification describes the meaning of those fields: http://diamon.org/ctf/#spec8 In your case, this means that the timestamps in the trace are expressed relative to an arbitrary time set 1524226572435601778 clock ticks after 00:00:00 on 1 January 1970. To take your specific example: Your clock is running at 1,000,000,000 Hz, meaning the duration of a clock tick (period) is of 1 ns. The event has occurred at 1524226572435601778 (offset) + 00000003827855360941 (event clock value) nanoseconds after UNIX Epoch. That leads us to around Friday, April 20, 2018 1:20:00 PM (GMT). Regards, Jérémie On 20 April 2018 at 11:06, Sai Tujala <sai.tuj...@mathworks.in> wrote: > Hi Jeremie, > > > > In metadata file of LTTng trace session, offset from > Epoch is “1524226572435601778” and time stamp of an event in channel data > files is starting from “00000003827855360941”. Can you brief about > relevance between these two time stamps. > > > > freq = 1000000000; /* Frequency, in Hz */ > > /* clock value offset from Epoch is: offset * (1/freq) */ > > offset = 1524226572435601778; > > > > > > Thanks & Regards, > > T Sai Kiran > > > -- Jérémie Galarneau EfficiOS Inc. http://www.efficios.com
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