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FAST Protocol
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Re: FAST Complaints
Rolf Andersson / Pantor Engineering
2 Feb 2010 12:20AM ET > - What is the "exact" processing overhead of FAST field and transfer
> encoding respectively?
I may have been somewhat imprecise or implicit when posing the question above. There are several different questions embedded here:
1. What is the processing overhead of the field encoding?
2. What is the processing overhead of the transfer encoding?
3. How does the processing overhead vary depending on the input data?
4. How does the processing overhead of the transfer encoding vary depending on the processing overhead of the field encoding?
A variation of q4 could be: How does the processing overhead of field encoding and transfer encoding respectively correlate for individual messages?
I recall that during testing in June 2005, we found a few cancel messages in the ARCA test data set that ended up being encoded as a pmap only. Every field (incl the tid) was defaulted after field encoding. So, while field encoding took some resources comparing and making the decision to default code each field value, the transfer encoding ended up passing a one-byte pmap. Obviously, this only happened very rarely, I believe we found less than a handful in the 77-million or so real messages used for testing of the ARCA feed.
/Rolf
Re: FAST Complaints
Rolf Andersson / Pantor Engineering 2 Feb 2010 12:20AM ET
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