swaits
28097611a7
- eliminated `f64` feature because Cargo doesn’t understand mutually exclusive features. So, we default to `f64`, and leave the `f32` feature there if people want to change to that. - integrated tarpaulin for coverage - added tests to get to 100% coverage - fixed NetworkCoordinate Div impl safety checks (now acts like Add and Sub) - update README to explain cargo feature change - cleanup build script with the new simpler features model Signed-off-by: Stephen Waits <steve@waits.net>
112 lines
3.2 KiB
Rust
112 lines
3.2 KiB
Rust
// this uses a copy of data from https://github.com/uofa-rzhu3/NetLatency-Data
|
|
//
|
|
// for info on the format, see `NetLatency-Data/README.md`
|
|
|
|
//
|
|
// **** Features ****
|
|
//
|
|
|
|
/// `FloatType` is a type alias for either `f32` or `f64` depending on cargo features
|
|
#[cfg(feature = "f32")]
|
|
type FloatType = f32;
|
|
|
|
/// `FloatType` is a type alias for either `f32` or `f64` depending on cargo features
|
|
#[cfg(not(feature = "f32"))]
|
|
type FloatType = f64;
|
|
|
|
use std::{
|
|
fs::File,
|
|
io::{BufReader, Read},
|
|
time::Duration,
|
|
};
|
|
|
|
use rand::Rng;
|
|
use vivaldi_nc::NetworkCoordinate;
|
|
|
|
// this will return a Vec<Vec<Duration>>
|
|
fn load_planetlab_file(filename: &str) -> Vec<Vec<Duration>> {
|
|
// we're expecting 490 lines, each with 490 numbers representing ms
|
|
let f = File::open(filename).expect("unable to open file");
|
|
let mut str = String::new();
|
|
BufReader::new(f)
|
|
.read_to_string(&mut str)
|
|
.expect("unable to read file");
|
|
|
|
str.lines()
|
|
.map(|line| {
|
|
// ...
|
|
line.split_whitespace()
|
|
.map(|token| {
|
|
Duration::from_secs_f32(token.parse::<f32>().expect("parse error") / 1000.0)
|
|
})
|
|
.collect()
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
const NUM_LATENCY_SETS: usize = 18;
|
|
const NUM_NODES: usize = 490;
|
|
|
|
fn load_data() -> Vec<Vec<Vec<Duration>>> {
|
|
// our input filenames (note naming is 1-based, not 0-based)
|
|
(1..=NUM_LATENCY_SETS)
|
|
.map(|i| {
|
|
let filename = format!("examples/NetLatency-Data/PlanetLab/PlanetLabData_{i}");
|
|
load_planetlab_file(&filename)
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
fn main() {
|
|
// fetch all the PlanetLab latency data
|
|
let data = load_data();
|
|
|
|
// make check to see that we got NUM_NODES worth of data
|
|
assert_eq!(data.len(), NUM_LATENCY_SETS);
|
|
assert_eq!(data[0].len(), NUM_NODES);
|
|
assert_eq!(data[0][0].len(), NUM_NODES);
|
|
|
|
// create our network coordinates
|
|
let mut nc: Vec<NetworkCoordinate<3>> = (0..NUM_NODES)
|
|
.map(|_| NetworkCoordinate::<3>::new())
|
|
.collect();
|
|
|
|
// the main loop:
|
|
// 1. choose a local and remote NC
|
|
// 2. choose one of the 18 latency sample sets
|
|
// 3. lookup the latency in our data
|
|
// 4. adjust local NC
|
|
let mut error = 0.0;
|
|
for _ in 0..30_000 {
|
|
let mut rng = rand::thread_rng();
|
|
// 1. choose a local and remote NC
|
|
let i_local = rng.gen_range(0..NUM_NODES);
|
|
let i_remote = rng.gen_range(0..NUM_NODES);
|
|
if i_local == i_remote {
|
|
continue;
|
|
}
|
|
|
|
// 2. choose one of the 18 latency sample sets
|
|
let i_set = 0; //rng.generate::<usize>() % NUM_LATENCY_SETS;
|
|
|
|
// 3. lookup the latency in our data
|
|
let rtt_measured = data[i_set][i_local][i_remote];
|
|
|
|
// 4. adjust local NC
|
|
let nc_remote = nc[i_remote].clone();
|
|
nc[i_local].update(&nc_remote, rtt_measured);
|
|
|
|
// complete, now let's sum up the error
|
|
error = nc.iter().map(|n| n.error()).sum::<FloatType>() / NUM_NODES as FloatType;
|
|
assert!(error.is_finite());
|
|
if error < 5.0 {
|
|
break;
|
|
}
|
|
}
|
|
assert!(error < 5.0);
|
|
|
|
// output the NC array as JSON
|
|
let json = serde_json::to_string_pretty(&nc).expect("JSON serialization error");
|
|
println!("{json}");
|
|
}
|