Incremental reporters

[tsenart]

With the previous work on making most of the data pipeline stream results as they come, it would be great to have a some new reporters which incrementally reflect new incoming data.

[mickey]

TLDR; https://asciinema.org/a/16198

Hey @tsenart here is a basic prototype for an incremental reporter that prints the latency of every requests to stdout.
In my video I pipe this to feedgnuplot to have a real time plot :D

Looking at only the first 4 characters of the reporter name might be a problem if adding more.

If you're interested I'd happily submit a pull request. Otherwise, what kind of reporter do you have in mind?

[tsenart]

Hey @mickey,

Thanks for your interest in this issue and for showing me feedgnuplot! I didn't know about it.
Since we now have a dump command which can be used in a pipeline with tools like feedgnuplot, I believe this issue can be closed. With that said, I don't think your change set is required to achieve what you want. Mind, though, that the latency is in nanoseconds so you'd have to convert it to milliseconds first. Anyways, here's an example (beware the possible output buffering done by awk which is platform dependent).

echo "GET http://:6060/" | vegeta attack -duration=60s -rate=200 | tee results.bin \
| vegeta dump -dumper="json" | jq '.latency' | awk '{print $1/1e6}' | feedgnuplot

[mickey]

Hey @tsenart thanks for your feedback!
I agree it doesn't make sense with the use of the dump command.
This is perfect, thanks!