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Improve CPU usage efficiency #1448

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merged 4 commits into from
Jan 10, 2025
Merged

Improve CPU usage efficiency #1448

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ea30968
Push CPU usage computation efficiency fix
provrb Jan 4, 2025
d31b8e8
Fix overlook, last update should only be set when actually retrieving…
provrb Jan 4, 2025
127d10a
Return the old calculated cpu usage if the cpu usage hasn't updated, …
provrb Jan 8, 2025
bb47efe
early return
provrb Jan 9, 2025
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17 changes: 15 additions & 2 deletions src/windows/process.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ use std::process::{self, ExitStatus};
use std::ptr::null_mut;
use std::str;
use std::sync::{Arc, OnceLock};
use std::time::Instant;

use libc::c_void;
use ntapi::ntexapi::SYSTEM_PROCESS_INFORMATION;
Expand Down Expand Up @@ -47,6 +48,8 @@ use windows::Win32::System::Threading::{
};
use windows::Win32::UI::Shell::CommandLineToArgvW;

use super::MINIMUM_CPU_UPDATE_INTERVAL;

impl fmt::Display for ProcessStatus {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str(match *self {
Expand Down Expand Up @@ -196,6 +199,7 @@ struct CPUsageCalculationValues {
old_process_user_cpu: u64,
old_system_sys_cpu: u64,
old_system_user_cpu: u64,
last_update: Instant,
}

impl CPUsageCalculationValues {
Expand All @@ -205,6 +209,7 @@ impl CPUsageCalculationValues {
old_process_user_cpu: 0,
old_system_sys_cpu: 0,
old_system_user_cpu: 0,
last_update: Instant::now(),
}
}
}
Expand Down Expand Up @@ -962,14 +967,22 @@ pub(crate) fn compute_cpu_usage(p: &mut ProcessInner, nb_cpus: u64) {
if let Some(handle) = p.get_handle() {
let _err = GetProcessTimes(handle, &mut ftime, &mut ftime, &mut fsys, &mut fuser);
}
// FIXME: should these values be stored in one place to make use of
// `MINIMUM_CPU_UPDATE_INTERVAL`?

if p.cpu_calc_values.last_update.elapsed() <= MINIMUM_CPU_UPDATE_INTERVAL {
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This can be put at the very beginning of this function, no need for all the variable initializations and the GetProcessTimes call.

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Fixed.

// cpu usage hasn't updated. p.cpu_usage remains the same
return;
}

// system times have changed, we need to get most recent system times
// and update the cpu times cache, as well as global_kernel_time and global_user_time
let _err = GetSystemTimes(
Some(&mut fglobal_idle_time),
Some(&mut fglobal_kernel_time),
Some(&mut fglobal_user_time),
);

p.cpu_calc_values.last_update = Instant::now();

let sys = filetime_to_u64(fsys);
let user = filetime_to_u64(fuser);
let global_kernel_time = filetime_to_u64(fglobal_kernel_time);
Expand Down
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