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//! Like [`std::time::Instant`], but for memory.
//!
//! Measures the total size of all currently allocated objects.
use std::fmt;
use cfg_if::cfg_if;
#[derive(Copy, Clone)]
pub struct MemoryUsage {
pub allocated: Bytes,
}
impl fmt::Display for MemoryUsage {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "{}", self.allocated)
}
}
impl std::ops::Sub for MemoryUsage {
type Output = MemoryUsage;
fn sub(self, rhs: MemoryUsage) -> MemoryUsage {
MemoryUsage { allocated: self.allocated - rhs.allocated }
}
}
impl MemoryUsage {
pub fn now() -> MemoryUsage {
cfg_if! {
if #[cfg(all(feature = "jemalloc", not(target_env = "msvc")))] {
jemalloc_ctl::epoch::advance().unwrap();
MemoryUsage {
allocated: Bytes(jemalloc_ctl::stats::allocated::read().unwrap() as isize),
}
} else if #[cfg(all(target_os = "linux", target_env = "gnu"))] {
// Note: This is incredibly slow.
let alloc = unsafe { libc::mallinfo() }.uordblks as isize;
MemoryUsage { allocated: Bytes(alloc) }
} else if #[cfg(windows)] {
// There doesn't seem to be an API for determining heap usage, so we try to
// approximate that by using the Commit Charge value.
use winapi::um::processthreadsapi::*;
use winapi::um::psapi::*;
use std::mem::{MaybeUninit, size_of};
let proc = unsafe { GetCurrentProcess() };
let mut mem_counters = MaybeUninit::uninit();
let cb = size_of::<PROCESS_MEMORY_COUNTERS>();
let ret = unsafe { GetProcessMemoryInfo(proc, mem_counters.as_mut_ptr(), cb as u32) };
assert!(ret != 0);
let usage = unsafe { mem_counters.assume_init().PagefileUsage };
MemoryUsage { allocated: Bytes(usage as isize) }
} else {
MemoryUsage { allocated: Bytes(0) }
}
}
}
}
#[derive(Default, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
pub struct Bytes(isize);
impl Bytes {
pub fn megabytes(self) -> isize {
self.0 / 1024 / 1024
}
}
impl fmt::Display for Bytes {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let bytes = self.0;
let mut value = bytes;
let mut suffix = "b";
if value.abs() > 4096 {
value /= 1024;
suffix = "kb";
if value.abs() > 4096 {
value /= 1024;
suffix = "mb";
}
}
f.pad(&format!("{}{}", value, suffix))
}
}
impl std::ops::AddAssign<usize> for Bytes {
fn add_assign(&mut self, x: usize) {
self.0 += x as isize;
}
}
impl std::ops::Sub for Bytes {
type Output = Bytes;
fn sub(self, rhs: Bytes) -> Bytes {
Bytes(self.0 - rhs.0)
}
}
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