supafly is a synthetic application for "proving" the point that evaluating
apps/protocols that use X cpu on PlanetLab can also add network artifacts. sfmiddleman sits in the middle as a compute-intensive proxy. sfsender sends the middleman n "messages" each composed of m "blocks", and can pause for t1 and t2 times at microsecond granularity after each block send and msg send. sfmiddleman reads blocks and does operations on them (default is decrypt/encrypt, can also do only encrypt), then forwards them to all connected receivers. You guessed it, sfreceiver connects to sfmiddleman and reads blocks and prints timestamps. For each op on a block, sfmiddleman notes the number of microseconds taken by the crypto ops, and the timestamp when it/they finished, and prints those. There is one known bug. I'll fix it in the morning. If there are others, I'll get them then too.
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