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use std::time::{Duration};
use std::collections::hash_map::Iter;
use {Pid, Meter, Report, Snapshot, ThreadReport};
pub struct ThreadReportIter<'a> {
threads: Iter<'a,Pid, String>,
last: &'a Snapshot,
prev: &'a Snapshot,
centisecs: f32,
}
fn duration_from_ms(ms: u64) -> Duration {
Duration::new(ms / 1000, ((ms % 1000) * 1000_000) as u32)
}
impl Meter {
pub fn report(&self) -> Option<Report> {
if self.snapshots.len() < 2 {
return None;
}
let n = self.snapshots.len();
let last = &self.snapshots[n-1];
let prev = &self.snapshots[n-2];
let lpro = &last.process;
let ppro = &prev.process;
let centisecs = (last.uptime - prev.uptime) as f32;
let secs = centisecs / 100.0;
let mut cpu_usage = 100.0 * (1.0 -
(last.idle_time - prev.idle_time) as f32 /
(centisecs * self.num_cpus as f32));
if cpu_usage < 0. {
cpu_usage = 0.;
}
Some(Report {
timestamp: last.timestamp,
duration: last.instant - prev.instant,
start_time: self.start_time,
system_uptime: duration_from_ms(last.uptime * 10),
global_cpu_usage: cpu_usage,
process_cpu_usage: 100.0 *
(lpro.user_time + lpro.system_time -
(ppro.user_time + ppro.system_time)) as f32 / centisecs,
gross_cpu_usage: 100.0 *
((lpro.user_time + lpro.system_time +
lpro.child_user_time + lpro.child_system_time) -
(ppro.user_time + ppro.system_time +
ppro.child_user_time + ppro.child_system_time)) as f32 /
centisecs,
memory_rss: last.memory_rss,
memory_virtual: last.memory_virtual,
memory_swap: last.memory_swap,
memory_rss_peak: self.memory_rss_peak,
memory_virtual_peak: last.memory_virtual_peak,
memory_swap_peak: self.memory_swap_peak,
disk_read: (last.read_disk_bytes - prev.read_disk_bytes) as f32
/ secs,
disk_write: (last.write_disk_bytes - prev.write_disk_bytes) as f32
/ secs,
disk_cancelled: (last.write_cancelled_bytes -
prev.write_cancelled_bytes) as f32 / secs,
io_read: (last.read_bytes - prev.read_bytes) as f32 / secs,
io_write: (last.write_bytes - prev.write_bytes) as f32 / secs,
io_read_ops: (last.read_ops - prev.read_ops) as f32 / secs,
io_write_ops: (last.write_ops - prev.write_ops) as f32 / secs,
})
}
pub fn thread_report(&self) -> Option<ThreadReportIter> {
if self.snapshots.len() < 2 {
return None;
}
let n = self.snapshots.len();
let last = &self.snapshots[n-1];
let prev = &self.snapshots[n-2];
let centisecs = (last.uptime - prev.uptime) as f32;
Some(ThreadReportIter {
threads: self.thread_names.iter(),
last: last,
prev: prev,
centisecs: centisecs,
})
}
}
impl<'a> Iterator for ThreadReportIter<'a> {
type Item = (&'a str, ThreadReport);
fn next(&mut self) -> Option<(&'a str, ThreadReport)> {
while let Some((&pid, name)) = self.threads.next() {
let lth = if let Some(thread) = self.last.threads.get(&pid) {
thread
} else {
continue;
};
let pth = if let Some(thread) = self.prev.threads.get(&pid) {
thread
} else {
continue;
};
let udelta = lth.user_time - pth.user_time;
let sdelta = lth.system_time - pth.system_time;
return Some((&name[..], ThreadReport {
cpu_usage: 100.0 * (udelta + sdelta) as f32 / self.centisecs,
system_cpu: 100.0 * sdelta as f32 / self.centisecs,
user_cpu: 100.0 * udelta as f32 / self.centisecs,
}))
}
None
}
fn size_hint(&self) -> (usize, Option<usize>) {
let (_min, max) = self.threads.size_hint();
return (0, max);
}
}