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further optimize uptime retrival

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Try and minimize expensive operations (e.g., divisions and allocations) to hopefully get a
*consistent* measurable performance improvement. In my testing this brings the get_current
function duration from > 1.2600 µs to < 1.2400 µs.
This commit is contained in:
raf 2025-01-26 01:06:02 +03:00
parent 592fb58474
commit d0f88b179c
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1 changed files with 23 additions and 10 deletions
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33
src/uptime.rs
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@ -5,16 +5,29 @@ pub fn get_current() -> Result<String, io::Error> {
let info = sysinfo().map_err(|e| io::Error::new(io::ErrorKind::Other, e))?; let info = sysinfo().map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
let uptime_seconds = info.uptime().as_secs(); let uptime_seconds = info.uptime().as_secs();
let total_minutes = uptime_seconds / 60; let days = uptime_seconds / (60 * 60 * 24);
let days = total_minutes / (60 * 24); let hours = (uptime_seconds / 3600) % 24;
let hours = (total_minutes % (60 * 24)) / 60; let minutes = (uptime_seconds / 60) % 60;
let minutes = total_minutes % 60;
let parts = [(days, "day"), (hours, "hour"), (minutes, "minute")] let mut result = String::new();
.iter() if days > 0 {
.filter(|&&(value, _)| value > 0) result.push_str(&format!("{days} day{}", if days > 1 { "s" } else { "" }));
.map(|&(value, label)| format!("{value} {label}{}", if value > 1 { "s" } else { "" })) }
.collect::<Vec<_>>(); if hours > 0 {
if !result.is_empty() {
result.push_str(", ");
}
result.push_str(&format!("{hours} hour{}", if hours > 1 { "s" } else { "" }));
}
if minutes > 0 {
if !result.is_empty() {
result.push_str(", ");
}
result.push_str(&format!(
"{minutes} minute{}",
if minutes > 1 { "s" } else { "" }
));
}
Ok(parts.join(", ")) Ok(result)
} }