Report duration of each iteration

[joecryptotoo]

docker-compose.yml for testing:

---
version: "2.1"
services:

  gateway-mfr-rs:
    build:
      context: https://github.com/joecryptotoo/gateway-mfr-rs.git#bench
    cap_add:
      - SYS_RAWIO
    devices:
      - /dev/i2c-1:/dev/i2c-1
    command: /usr/src/gateway-mfr-rs/target/debug/gateway_mfr --device ecc://i2c-1:96 bench -i 3

Just run docker compose up and this should build from my bench branch and run.

[madninja]

Just listing out all the timings for each iteration is going to get way too large to work with.

How about using histogram bucketing and reporting that instead? that way you get the median and percentiles reported in a single short list of numbers

[madninja]

hmm.. nope sorry.. I 'd like just the fix.. and then we need to work on the durations output being optional and not forced in by default

[joecryptotoo]

hmm.. nope sorry.. I 'd like just the fix.. and then we need to work on the durations output being optional and not forced in by default

@madninja
durations are now optional with the -d flag

[madninja]

Why not map durations to a Vec of mills and then just insert it into the top level json?
e.g.

let durations: Vec<u128> = durations.map(|d| d.as_millis()).collect();

and in the json construction above:

let json = json!({
    "iterations": self.iterations,
    "avg_ms": round2(avg_ms),
    "rate": round2(rate),
    "durations": durations,
 });