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use a statically-allocated stack for Context::new benchmarking 

Now it's an actual context creation benchmark, instead of benchmarking
our stack creation, which is swappable anyway.
This commit is contained in:
edef 2015-04-15 22:01:08 -04:00
parent 7167b0b570
commit c19fc4625a
1 changed files with 17 additions and 3 deletions
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20
benches/context_new.rs
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@ -1,14 +1,15 @@
#![feature(test)] #![feature(test)]
extern crate test; extern crate test;
extern crate lwkt; extern crate lwkt;
use lwkt::{Context, StackSource}; use lwkt::{Context, Stack};
static mut ctx_slot: *mut Context<lwkt::os::Stack> = 0 as *mut Context<_>; static mut ctx_slot: *mut Context<SliceStack<'static>> = 0 as *mut Context<_>;
static mut stack_buf: [u8; 1024] = [0; 1024];
#[bench] #[bench]
fn context_new(b: &mut test::Bencher) { fn context_new(b: &mut test::Bencher) {
b.iter(|| unsafe { b.iter(|| unsafe {
let stack = lwkt::os::StackSource::get_stack(4 << 20); let stack = SliceStack(&mut stack_buf);
let mut ctx = Context::new(stack, move || { let mut ctx = Context::new(stack, move || {
let ctx_ptr = ctx_slot; let ctx_ptr = ctx_slot;
@ -22,3 +23,16 @@ fn context_new(b: &mut test::Bencher) {
ctx.swap(); ctx.swap();
}) })
} }
struct SliceStack<'a>(&'a mut [u8]);
impl<'a> lwkt::Stack for SliceStack<'a> {
fn top(&mut self) -> *mut u8 {
unsafe {
self.0.as_mut_ptr().offset(self.0.len() as isize)
}
}
fn limit(&self) -> *const u8 {
self.0.as_ptr()
}
}