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use std::sync::atomic::{AtomicUsize, Ordering};
use atomic_refcell::AtomicRefCell;
use mmtk::scheduler::{GCWork, GCWorker, WorkBucketStage};
use sysinfo::System;
use crate::Ruby;
pub struct ChunkedVecCollector<T> {
vecs: Vec<Vec<T>>,
current_vec: Vec<T>,
chunk_size: usize,
}
impl<T> ChunkedVecCollector<T> {
pub fn new(chunk_size: usize) -> Self {
Self {
vecs: vec![],
current_vec: Vec::with_capacity(chunk_size),
chunk_size,
}
}
pub fn add(&mut self, item: T) {
self.current_vec.push(item);
if self.current_vec.len() == self.chunk_size {
self.flush();
}
}
fn flush(&mut self) {
let new_vec = Vec::with_capacity(self.chunk_size);
let old_vec = std::mem::replace(&mut self.current_vec, new_vec);
self.vecs.push(old_vec);
}
pub fn into_vecs(mut self) -> Vec<Vec<T>> {
if !self.current_vec.is_empty() {
self.flush();
}
self.vecs
}
}
impl<A> Extend<A> for ChunkedVecCollector<A> {
fn extend<T: IntoIterator<Item = A>>(&mut self, iter: T) {
for item in iter {
self.add(item);
}
}
}
pub struct AfterAll {
counter: AtomicUsize,
stage: WorkBucketStage,
packets: AtomicRefCell<Vec<Box<dyn GCWork<Ruby>>>>,
}
unsafe impl Sync for AfterAll {}
impl AfterAll {
pub fn new(stage: WorkBucketStage) -> Self {
Self {
counter: AtomicUsize::new(0),
stage,
packets: AtomicRefCell::new(vec![]),
}
}
pub fn add_packets(&self, mut packets: Vec<Box<dyn GCWork<Ruby>>>) {
let mut borrow = self.packets.borrow_mut();
borrow.append(&mut packets);
}
pub fn count_up(&self, n: usize) {
self.counter.fetch_add(n, Ordering::SeqCst);
}
pub fn count_down(&self, worker: &mut GCWorker<Ruby>) {
let old = self.counter.fetch_sub(1, Ordering::SeqCst);
if old == 1 {
let packets = {
let mut borrow = self.packets.borrow_mut();
std::mem::take(borrow.as_mut())
};
worker.scheduler().work_buckets[self.stage].bulk_add(packets);
}
}
}
pub fn default_heap_max() -> usize {
let mut s = System::new();
s.refresh_memory();
s.total_memory()
.checked_mul(80)
.and_then(|v| v.checked_div(100))
.expect("Invalid Memory size") as usize
}
pub fn parse_capacity(input: &String, default: usize) -> usize {
let trimmed = input.trim();
const KIBIBYTE: usize = 1024;
const MEBIBYTE: usize = 1024 * KIBIBYTE;
const GIBIBYTE: usize = 1024 * MEBIBYTE;
let (val, suffix) = if let Some(pos) = trimmed.find(|c: char| !c.is_numeric()) {
(&trimmed[..pos], &trimmed[pos..])
} else {
(trimmed, "")
};
// 1MiB is the default heap size
match (val, suffix) {
(number, "GiB") => number.parse::<usize>()
.and_then(|v| Ok(v * GIBIBYTE))
.unwrap_or(default),
(number, "MiB") => number.parse::<usize>()
.and_then(|v| Ok(v * MEBIBYTE))
.unwrap_or(default),
(number, "KiB") => number.parse::<usize>()
.and_then(|v| Ok(v * KIBIBYTE))
.unwrap_or(default),
(number, suffix) if suffix.is_empty() => number.parse::<usize>().unwrap_or(default),
(_, _) => default
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse_capacity_parses_bare_bytes() {
assert_eq!(1234, parse_capacity(&String::from("1234"), 0));
}
#[test]
fn test_parse_capacity_parses_kibibytes() {
assert_eq!(10240, parse_capacity(&String::from("10KiB"), 0))
}
#[test]
fn test_parse_capacity_parses_mebibytes() {
assert_eq!(10485760, parse_capacity(&String::from("10MiB"), 0))
}
#[test]
fn test_parse_capacity_parses_gibibytes() {
assert_eq!(10737418240, parse_capacity(&String::from("10GiB"), 0))
}
#[test]
fn test_parses_nonsense_value_as_default_max() {
let default = 100;
assert_eq!(default, parse_capacity(&String::from("notanumber"), default));
assert_eq!(default, parse_capacity(&String::from("5tartswithanumber"), default));
assert_eq!(default, parse_capacity(&String::from("number1nthemiddle"), default));
assert_eq!(default, parse_capacity(&String::from("numberattheend111"), default));
assert_eq!(default, parse_capacity(&String::from("mult1pl3numb3r5"), default));
}
}
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