drahnr
November 17, 2017, 12:01pm
1
I am trying to use UnorderedMap to simulate IoT devices on a large scale (>20k).
Unfortunately, UnorderedMap spawns a lot of threads and I am quickly running into OS limitations where the actual work is actually miniscule and could be done by very few threads - if not a single one.
#[macro_use]
extern crate error_chain;
extern crate futures;
extern crate tokio_core;
extern crate tokio_io;
extern crate tokio_periodic;
extern crate tokio_timer;
use futures::stream::Stream;
use tokio_core::reactor::Core;
use tokio_core::net::TcpListener;
use futures::future::{Future, BoxFuture};
use futures::{Async,Poll};
use std::vec::Vec;
mod error {
error_chain! {
foreign_links {
Fmt(::std::fmt::Error);
Io(::std::io::Error) #[cfg(unix)];
Timer(::tokio_timer::TimerError);
}
errors {
Stuff(t: String) {
description("invalid stuff")
display("invalid stuff: '{}'", t)
}
Things(v: String) {
description("unknown thing"), // note the ,
display("unknown thing: '{}'", v), // trailing comma is allowed
}
}
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
enum Action {
WorkWork,
DillyDally,
YodaYada,
}
use std::collections::VecDeque;
struct Squeeze {
actions : Vec<Action>,
current : Option<Action>,
}
impl Squeeze {
pub fn new() -> Self {
let mut x = Self {
actions : vec![],
current : None,
};
x.actions.push(Action::WorkWork);
x.actions.push(Action::DillyDally);
x.actions.push(Action::YodaYada);
x
}
pub fn next(&mut self) -> Option<Action> {
self.current = self.actions.pop();
self.current.clone()
}
}
impl Stream for Squeeze {
type Item = Action;
type Error = error::Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
// lazy_static!{
// let TIMER = Timer::default();
// }
if let Some(action) = self.next() {
println!("Action {:?}", &action);
Ok(Async::Ready(Some(action)))
} else {
println!("No Actions left");
//Ok(Async::NotReady) // still some actions to run
Ok(Async::Ready(None))
}
}
}
type MyFut = BoxFuture<(), error::Error>;
fn main() {
let mut core = tokio_core::reactor::Core::new().unwrap();
let handle = core.handle();
let mut fmap = futures::stream::FuturesUnordered::new();
for i in 0..4000 { // this can't go much higher without fiddling with OS limits, though not actually necessary
let work_stream = Squeeze::new();
let work_fut = work_stream.for_each(|action| {
println!("Action by Future {:?}", action);
let timer = tokio_timer::Timer::default();
let sleep = timer.sleep(std::time::Duration::from_millis(500)).map_err(|e| error::ErrorKind::Stuff("Happy".into()).into());
sleep
//futures::future::result::<(),error::Error>(Ok(()))
} );
fmap.push(Box::new(work_fut));
}
let _ = core.run(fmap.into_future());//.unwrap();
println!("All work is done!");
}
1 Like
vitalyd
November 17, 2017, 12:33pm
2
You’re running on a single Core which is a single thread internally. Where are you seeing many threads starting?
drahnr
November 17, 2017, 12:35pm
3
// let timer = tokio_timer::Timer::default();
// let sleep = timer.sleep(std::time::Duration::from_millis(500)).map_err(|e| error::ErrorKind::Stuff("Happy".into()).into());
// sleep
// futures::future::result::<(),error::Error>(Ok(()))
use tokio_core::reactor::{Handle, Timeout};
let timeout = Timeout::new(
std::time::Duration::from_secs(3),
&handle,
).unwrap();
timeout.map(|_| {()} ).map_err(|_| { error::ErrorKind::Things("Test".into()).into()})
Using the Timeout from tokio_core seems to work way better, ps -eLF then only shows one process and at least up to 100_000 it works just fine.
drahnr
November 17, 2017, 12:37pm
4
ps -eLF just because the tokio core runs on a single core does not imply anything for the other crates/tokio extensions.
Output procuded utilizing tokio_timer
...
bernhard 27698 27692 30352 0 2987 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30353 0 2987 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30573 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30574 0 3000 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30577 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30578 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30579 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30580 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30581 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30582 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30583 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30584 0 3000 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30585 0 3001 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30586 0 3001 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30588 0 3001 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30589 0 3001 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30592 0 3001 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30600 0 3002 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30643 0 3004 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30660 0 3006 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30710 0 3009 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30711 0 3010 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30712 0 3010 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30766 0 3013 12:56 pts/4 00:00:00 target/debug/x
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bernhard 27698 27692 30768 0 3013 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30769 0 3013 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30770 0 3013 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30771 0 3013 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30772 0 3013 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30773 0 3013 12:56 pts/4 00:00:00 target/debug/x
bernhard 27698 27692 30774 0 3013 12:56 pts/4 00:00:00 target/debug/x
...
Just an excerpt from what it actually shows, ran via cargo r.
vitalyd
November 17, 2017, 12:43pm
5
Yeah, I missed that you were using tokio_timer::Timer - that spawns a thread for each instance (and that's mentioned in its documentation). If you're working with Core and using components that don't take a Handle in their setup, you can be pretty certain they're not using the Core to drive themselves
1 Like
drahnr
November 17, 2017, 12:51pm
6
I must have missed that part of the documentation, I actually double checked but I guess I did not put enough attention to it.
vitalyd
November 17, 2017, 1:10pm
7
For anyone reading this later, it's in the first sentence of this section (granted, this probably should be further up in the docs): tokio_timer - Rust
.