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#[macro_use]
extern crate clap;
extern crate num;
use std::path::{Path, PathBuf};
use std::fs::File;
use std::io::{self, Read};
use std::{iter, thread, ops};
use std::time::Duration;
use clap::{Arg, App, AppSettings, SubCommand};
use num::NumCast;
const SYS_PRESENT: &'static str = "/sys/devices/system/cpu/present";
static FORMAT: [char; 9] = [' ', '▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'];
const WINDOW_SIZE: usize = 32;
#[derive(Debug, Default)]
struct Window<T> {
data: Vec<T>,
idx: usize,
size: usize
}
impl<T> Window<T> where T: for<'a> iter::Sum<&'a T> + ops::Div<Output=T> + NumCast {
fn new(size: usize) -> Window<T> {
Window { data: Vec::with_capacity(size), idx: 0, size: size }
}
fn sample(&mut self, value: T) {
if self.data.len() < self.size { self.data.push(value) }
else { self.data[self.idx] = value; }
self.idx = (self.idx + 1) % self.size;
}
fn elements(&self) -> (&[T], &[T]) { (&self.data[self.idx..], &self.data[..self.idx]) }
fn average(&self) -> T { self.data.iter().sum::<T>() / T::from(self.data.len()).unwrap() }
}
#[derive(Debug, Default)]
struct Core {
index: u32,
min_freq: u32,
max_freq: u32,
cur_freq: Window<u32>
}
#[derive(Debug)]
struct System {
cores: Vec<Core>,
load: Window<f32>
}
impl System {
fn new() -> System {
System {
cores: init_cores(),
load: Window::new(8)
}
}
// Direct printing to avoid allocation
fn print_cores(&self) {
for c in &self.cores {
let load = (c.cur_freq.average() - c.min_freq) as f32 / (c.max_freq - c.min_freq) as f32;
print!("{}", FORMAT[(FORMAT.len() as f32 * load) as usize]);
}
println!("");
}
fn print_system(&self) {
let (first, last) = self.load.elements();
for load in first.iter().chain(last.iter()) {
print!("{}", FORMAT[(FORMAT.len() as f32 * load) as usize]);
}
println!("");
}
}
fn read_into_string<P: AsRef<Path>>(path: P) -> io::Result<String> {
let mut output = String::new();
try!(try!(File::open(path)).read_to_string(&mut output));
Ok(output)
}
fn init_cores() -> Vec<Core> {
let present = read_into_string(SYS_PRESENT).expect("Can't read kernel interface to query present cores");
// a-b
let mut parts = present.split('-').flat_map(|s| s.trim().parse::<u32>().ok());
let (a, b) = (parts.next().unwrap(), parts.next().unwrap());
(a..b + 1).map(|idx| {
let cpu_path: PathBuf = format!("/sys/devices/system/cpu/cpu{}/cpufreq", idx).into();
Core {
index: idx,
min_freq: read_into_string(cpu_path.join("scaling_min_freq")).ok()
.and_then(|s| s.trim().parse().ok()).expect("Can't read min freq"),
max_freq: read_into_string(cpu_path.join("scaling_max_freq")).ok()
.and_then(|s| s.trim().parse().ok()).expect("Can't read max frequency"),
cur_freq: Window::new(WINDOW_SIZE)
}
}).collect()
}
fn update(system: &mut System) {
let mut frame_average = 0.;
for c in &mut system.cores {
let cpu_path: PathBuf = format!("/sys/devices/system/cpu/cpu{}/cpufreq/scaling_cur_freq", c.index).into();
let cur_freq = read_into_string(cpu_path).ok()
.and_then(|s| s.trim().parse().ok()).expect("Can't read current frequency");
c.cur_freq.sample(cur_freq);
frame_average += (cur_freq - c.min_freq) as f32 / (c.max_freq - c.min_freq) as f32;
}
system.load.sample(frame_average / system.cores.len() as f32);
}
fn main() {
let matches = App::new("cpuline")
.version(crate_version!())
.author(crate_authors!())
.about("Display CPU usage per-core or over time (Linux-only)")
.setting(AppSettings::SubcommandRequired)
.arg(Arg::with_name("interval")
.global(true)
.short("i")
.long("interval")
.value_name("MS")
.takes_value(true)
.default_value("1000"))
.subcommand(SubCommand::with_name("cores"))
.subcommand(SubCommand::with_name("time"))
.get_matches();
let action = match matches.subcommand_name() {
Some("cores") => System::print_cores,
Some("time") => System::print_system,
_ => unreachable!()
};
let interval = value_t!(matches, "interval", u64).unwrap();
let mut system = System::new();
loop {
update(&mut system);
action(&system);
thread::sleep(Duration::from_millis(interval));
}
}
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