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#[macro_use]
extern crate clap;
extern crate vec_map;
extern crate libc;
#[macro_use]
extern crate log;
extern crate env_logger;
use std::fs::File;
use std::io::{self, BufRead, BufReader};
use std::thread;
use std::time::{Instant, Duration};
use clap::{Arg, App};
use vec_map::VecMap;
const PROC_STAT: &'static str = "/proc/stat";
static FORMAT: [char; 8] = ['▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'];
/// cpu 3357 0 4313 1362393
/// The amount of time, measured in units of USER_HZ (1/100ths of a
/// second on most architectures, use sysconf(_SC_CLK_TCK) to obtain
/// the right value), that the system spent in various states:
///
/// user (1) Time spent in user mode.
///
/// nice (2) Time spent in user mode with low priority (nice).
///
/// system (3) Time spent in system mode.
///
/// idle (4) Time spent in the idle task. This value should be
/// USER_HZ times the second entry in the /proc/uptime pseudo-
/// file.
///
/// iowait (since Linux 2.5.41)
/// (5) Time waiting for I/O to complete.
///
/// irq (since Linux 2.6.0-test4)
/// (6) Time servicing interrupts.
///
/// softirq (since Linux 2.6.0-test4)
/// (7) Time servicing softirqs.
///
/// steal (since Linux 2.6.11)
/// (8) Stolen time, which is the time spent in other operating
/// systems when running in a virtualized environment
///
/// guest (since Linux 2.6.24)
/// (9) Time spent running a virtual CPU for guest operating
/// systems under the control of the Linux kernel.
///
/// guest_nice (since Linux 2.6.33)
/// (10) Time spent running a niced guest (virtual CPU for
/// guest operating systems under the control of the Linux ker‐
/// nel).
#[derive(Debug)]
struct Stat {
time: Instant,
total: Option<CPU>,
cores: VecMap<CPU>
}
impl Stat {
pub fn read() -> io::Result<Stat> {
let file = try!(File::open(PROC_STAT));
let reader = BufReader::new(file);
let mut stat = Stat { time: Instant::now(), total: None, cores: VecMap::new() };
for line in reader.lines() {
let line = try!(line);
const OFFSET: usize = 3; // "cpu".len()
if line.starts_with("cpu ") {
stat.total = Some(CPU::from_line(&line[OFFSET..]));
} else if line.starts_with("cpu") {
let num: u64 = line[OFFSET..].split_whitespace().next().and_then(|s| s.trim().parse().ok()).unwrap();
stat.cores.insert(num as usize, CPU::from_line(&line[OFFSET..]));
}
}
Ok(stat)
}
pub fn load_since(&self, earlier: &Stat) -> Load {
Load {
duration: self.time.duration_since(earlier.time),
total: match (&self.total, &earlier.total) {
(&Some(ref now), &Some(ref old)) => Some(now.diff(old)),
_ => None
},
cores: self.cores.iter()
.flat_map(|(idx, core)| earlier.cores.get(idx).map(|ec| (idx, core.diff(ec))))
.collect()
}
}
}
#[derive(Debug, Clone)]
struct Load {
duration: Duration,
total: Option<CPU>,
cores: VecMap<CPU>
}
#[derive(Debug, Clone)]
struct CPU {
user: u64,
nice: u64,
system: u64,
idle: u64
}
impl CPU {
pub fn from_line(line: &str) -> CPU {
fn parse(s: Option<&str>) -> u64 { s.and_then(|s| s.trim().parse().ok()).expect("Couldn't parse CPU stat") }
let mut tok = line.split_whitespace();
CPU {
user: parse(tok.next()),
nice: parse(tok.next()),
system: parse(tok.next()),
idle: parse(tok.next())
}
}
pub fn diff(&self, other: &CPU) -> CPU {
CPU {
user: self.user - other.user,
nice: self.nice - other.nice,
system: self.system - other.system,
idle: self.idle - other.idle
}
}
}
fn main() {
env_logger::init().unwrap();
let matches = App::new("cpuline")
.version(crate_version!())
.author(crate_authors!())
.arg(Arg::with_name("interval")
.global(true)
.short("i")
.long("interval")
.value_name("MS")
.takes_value(true)
.default_value("1000"))
.get_matches();
let interval = value_t!(matches, "interval", u64).unwrap();
let mut stat = None;
let user_hz: u64 = unsafe { libc::sysconf(libc::_SC_CLK_TCK) as u64 };
debug!("user_hz({})", user_hz);
loop {
let old = stat;
stat = Stat::read().ok();
match (&stat, &old) {
(&Some(ref now), &Some(ref old)) => {
let load = now.load_since(&old);
let duration_ticks = load.duration.as_secs() * user_hz
+ (load.duration.subsec_nanos() as f64 / 1E9 * user_hz as f64) as u64;
for (_, core) in load.cores.iter() {
// How many ticks the core was in use
let used = core.user + core.nice + core.system;
// How long this core was used with 0 (not used) to 1 (fully used)
let used_part = used as f32 / duration_ticks as f32;
let output = FORMAT[((FORMAT.len() - 1) as f32 * used_part) as usize];
debug!("used_part({}) = used({}) / duration_ticks({}) => '{}'", used_part, used, duration_ticks, output);
print!("{}", output);
}
println!("");
},
_ => ()
}
thread::sleep(Duration::from_millis(interval));
}
}
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