syndicate-lang
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syndicate-rs
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Round-trip and (estimated) one-way latencies in pingpong example

This commit is contained in:
Tony Garnock-Jones 2020-06-12 21:30:15 +02:00
parent a525ce6f4a
commit 14b7aad9c6
1 changed files with 89 additions and 21 deletions
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110
examples/pingpong.rs
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@ -1,28 +1,34 @@
#![recursion_limit = "256"]
#![recursion_limit = "512"]
use core::time::Duration;
use futures::FutureExt;
use futures::SinkExt;
use futures::StreamExt;
use futures::select;
use std::time::{SystemTime, SystemTimeError};
use structopt::StructOpt;
use tokio::net::TcpStream;
use tokio::time::interval;
use tokio_util::codec::Framed;
use syndicate::packets::{ClientCodec, C2S, S2C, Action, Event};
use syndicate::value::Value;
use syndicate::value::{NestedValue, Value, IOValue};
#[derive(Clone, Debug, StructOpt)]
pub struct PingConfig {
#[structopt(short = "t", default_value = "1")]
turn_count: u32,
#[structopt(short = "a", default_value = "1")]
action_count: u32,
#[structopt(short = "l", default_value = "0")]
report_latency_every: usize,
}
#[derive(Clone, Debug, StructOpt)]
pub enum PingPongMode {
Ping {
#[structopt(short = "t", default_value = "1")]
turn_count: u32,
#[structopt(short = "a", default_value = "1")]
action_count: u32,
},
Ping(PingConfig),
Pong,
}
@ -35,40 +41,81 @@ pub struct Config {
dataspace: String,
}
fn now() -> Result<u64, SystemTimeError> {
Ok(SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?.as_nanos() as u64)
}
fn report_latencies(rtt_ns_samples: &Vec<u64>) {
let n = rtt_ns_samples.len();
let rtt_0 = rtt_ns_samples[0];
let rtt_50 = rtt_ns_samples[n * 1 / 2];
let rtt_90 = rtt_ns_samples[n * 90 / 100];
let rtt_95 = rtt_ns_samples[n * 95 / 100];
let rtt_99 = rtt_ns_samples[n * 99 / 100];
let rtt_99_9 = rtt_ns_samples[n * 999 / 1000];
let rtt_99_99 = rtt_ns_samples[n * 9999 / 10000];
let rtt_max = rtt_ns_samples[n - 1];
println!("rtt: 0% {:05.5}ms, 50% {:05.5}ms, 90% {:05.5}ms, 95% {:05.5}ms, 99% {:05.5}ms, 99.9% {:05.5}ms, 99.99% {:05.5}ms, max {:05.5}ms",
rtt_0 as f64 / 1000000.0,
rtt_50 as f64 / 1000000.0,
rtt_90 as f64 / 1000000.0,
rtt_95 as f64 / 1000000.0,
rtt_99 as f64 / 1000000.0,
rtt_99_9 as f64 / 1000000.0,
rtt_99_99 as f64 / 1000000.0,
rtt_max as f64 / 1000000.0);
println!("msg: 0% {:05.5}ms, 50% {:05.5}ms, 90% {:05.5}ms, 95% {:05.5}ms, 99% {:05.5}ms, 99.9% {:05.5}ms, 99.99% {:05.5}ms, max {:05.5}ms",
rtt_0 as f64 / 2000000.0,
rtt_50 as f64 / 2000000.0,
rtt_90 as f64 / 2000000.0,
rtt_95 as f64 / 2000000.0,
rtt_99 as f64 / 2000000.0,
rtt_99_9 as f64 / 2000000.0,
rtt_99_99 as f64 / 2000000.0,
rtt_max as f64 / 2000000.0);
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let config = Config::from_args();
let (send_label, recv_label) = match config.mode {
PingPongMode::Ping { turn_count: _, action_count: _ } => ("Ping", "Pong"),
PingPongMode::Pong => ("Pong", "Ping"),
let (send_label, recv_label, report_latency_every, should_echo) = match config.mode {
PingPongMode::Ping(ref c) => ("Ping", "Pong", c.report_latency_every, false),
PingPongMode::Pong => ("Pong", "Ping", 0, true),
};
let mut frames = Framed::new(TcpStream::connect("127.0.0.1:8001").await?, ClientCodec::new());
frames.send(C2S::Connect(Value::from(config.dataspace).wrap())).await?;
let discard = Value::simple_record("discard", vec![]).wrap();
let capture = Value::simple_record("capture", vec![discard]).wrap();
frames.send(
C2S::Turn(vec![Action::Assert(
Value::from(0).wrap(),
Value::simple_record("observe", vec![
Value::simple_record(recv_label, vec![]).wrap()]).wrap())]))
Value::simple_record(recv_label, vec![capture]).wrap()]).wrap())]))
.await?;
let mut stats_timer = interval(Duration::from_secs(1));
let mut turn_counter = 0;
let mut event_counter = 0;
let mut current_stamp: IOValue = Value::from(0).wrap();
if let PingPongMode::Ping { turn_count, action_count } = config.mode {
for _ in 0..turn_count {
if let PingPongMode::Ping(ref c) = config.mode {
for _ in 0..c.turn_count {
let mut actions = vec![];
for _ in 0..action_count {
current_stamp = Value::from(now()?).wrap();
for _ in 0..c.action_count {
actions.push(Action::Message(
Value::simple_record(send_label, vec![]).wrap()));
Value::simple_record(send_label, vec![current_stamp.clone()]).wrap()));
}
frames.send(C2S::Turn(actions)).await?;
}
}
let mut rtt_ns_samples: Vec<u64> = vec![0; report_latency_every];
let mut rtt_batch_count = 0;
loop {
select! {
_instant = stats_timer.next().boxed().fuse() => {
@ -84,11 +131,32 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
turn_counter = turn_counter + 1;
event_counter = event_counter + events.len();
let mut actions = vec![];
let mut have_sample = false;
for e in events {
match e {
Event::Msg(_, _) =>
actions.push(Action::Message(
Value::simple_record(send_label, vec![]).wrap())),
Event::Msg(_, captures) => {
if should_echo || (report_latency_every == 0) {
actions.push(Action::Message(
Value::simple_record(send_label, vec![captures[0].clone()]).wrap()));
} else {
if !have_sample {
let rtt_ns = now()? - captures[0].value().to_u64()?;
rtt_ns_samples[rtt_batch_count] = rtt_ns;
rtt_batch_count = rtt_batch_count + 1;
if rtt_batch_count == report_latency_every {
rtt_ns_samples.sort();
report_latencies(&rtt_ns_samples);
rtt_batch_count = 0;
}
have_sample = true;
current_stamp = Value::from(now()?).wrap();
}
actions.push(Action::Message(
Value::simple_record(send_label, vec![current_stamp.clone()]).wrap()));
}
}
_ =>
()
}