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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"))] {
memusage_linux()
} 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) }
}
}
}
}
#[cfg(all(target_os = "linux", target_env = "gnu"))]
fn memusage_linux() -> MemoryUsage {
// Linux/glibc has 2 APIs for allocator introspection that we can use: mallinfo and mallinfo2.
// mallinfo uses `int` fields and cannot handle memory usage exceeding 2 GB.
// mallinfo2 is very recent, so its presence needs to be detected at runtime.
// Both are abysmally slow.
use std::ffi::CStr;
use std::sync::atomic::{AtomicUsize, Ordering};
static MALLINFO2: AtomicUsize = AtomicUsize::new(1);
let mut mallinfo2 = MALLINFO2.load(Ordering::Relaxed);
if mallinfo2 == 1 {
let cstr = CStr::from_bytes_with_nul(b"mallinfo2\0").unwrap();
mallinfo2 = unsafe { libc::dlsym(libc::RTLD_DEFAULT, cstr.as_ptr()) } as usize;
// NB: races don't matter here, since they'll always store the same value
MALLINFO2.store(mallinfo2, Ordering::Relaxed);
}
if mallinfo2 == 0 {
// mallinfo2 does not exist, use mallinfo.
let alloc = unsafe { libc::mallinfo() }.uordblks as isize;
MemoryUsage { allocated: Bytes(alloc) }
} else {
let mallinfo2: fn() -> libc::mallinfo2 = unsafe { std::mem::transmute(mallinfo2) };
let alloc = mallinfo2().uordblks as isize;
MemoryUsage { allocated: Bytes(alloc) }
}
}
#[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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