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|
use anyhow::Result;
use criterion::*;
use wasmtime::*;
criterion_main!(benches);
criterion_group!(benches, bench_traps);
fn bench_traps(c: &mut Criterion) {
bench_multi_threaded_traps(c);
bench_many_modules_registered_traps(c);
bench_many_stack_frames_traps(c);
bench_host_wasm_frames_traps(c);
}
fn bench_multi_threaded_traps(c: &mut Criterion) {
let mut group = c.benchmark_group("multi-threaded-traps");
for num_bg_threads in vec![0, 1, 2, 4, 8, 16] {
group.throughput(Throughput::Elements(num_bg_threads));
group.bench_with_input(
BenchmarkId::from_parameter(num_bg_threads),
&num_bg_threads,
|b, &num_bg_threads| {
let engine = Engine::default();
let module = module(&engine, 10).unwrap();
b.iter_custom(|iters| {
let (started_sender, started_receiver) = std::sync::mpsc::channel();
// Spawn threads in the background doing infinite work.
let threads = (0..num_bg_threads)
.map(|_| {
let (done_sender, done_receiver) = std::sync::mpsc::channel();
let handle = std::thread::spawn({
let engine = engine.clone();
let module = module.clone();
let started_sender = started_sender.clone();
move || {
let mut store = Store::new(&engine, ());
let instance = Instance::new(&mut store, &module, &[]).unwrap();
let f =
instance.get_typed_func::<(), ()>(&mut store, "").unwrap();
// Notify the parent thread that we are
// doing background work now.
started_sender.send(()).unwrap();
// Keep doing background work until the
// parent tells us to stop.
loop {
if let Ok(()) = done_receiver.try_recv() {
return;
}
assert!(f.call(&mut store, ()).is_err());
}
}
});
(handle, done_sender)
})
.collect::<Vec<_>>();
// Wait on all the threads to start up.
for _ in 0..num_bg_threads {
let _ = started_receiver.recv().unwrap();
}
let mut store = Store::new(&engine, ());
let instance = Instance::new(&mut store, &module, &[]).unwrap();
let f = instance.get_typed_func::<(), ()>(&mut store, "").unwrap();
// Measure how long it takes to do `iters` worth of traps
// while there is a bunch of background work going on.
let start = std::time::Instant::now();
for _ in 0..iters {
assert!(f.call(&mut store, ()).is_err());
}
let elapsed = start.elapsed();
// Clean up all of our background threads.
threads.into_iter().for_each(|(handle, done_sender)| {
done_sender.send(()).unwrap();
handle.join().unwrap();
});
elapsed
});
},
);
}
group.finish();
}
fn bench_many_modules_registered_traps(c: &mut Criterion) {
let mut group = c.benchmark_group("many-modules-registered-traps");
for num_modules in vec![1, 8, 64, 512, 4096] {
group.throughput(Throughput::Elements(num_modules));
group.bench_with_input(
BenchmarkId::from_parameter(num_modules),
&num_modules,
|b, &num_modules| {
let engine = Engine::default();
let modules = (0..num_modules)
.map(|_| module(&engine, 10).unwrap())
.collect::<Vec<_>>();
b.iter_custom(|iters| {
let mut store = Store::new(&engine, ());
let instance = Instance::new(&mut store, modules.last().unwrap(), &[]).unwrap();
let f = instance.get_typed_func::<(), ()>(&mut store, "").unwrap();
let start = std::time::Instant::now();
for _ in 0..iters {
assert!(f.call(&mut store, ()).is_err());
}
start.elapsed()
});
},
);
}
group.finish()
}
fn bench_many_stack_frames_traps(c: &mut Criterion) {
let mut group = c.benchmark_group("many-stack-frames-traps");
for num_stack_frames in vec![1, 8, 64, 512] {
group.throughput(Throughput::Elements(num_stack_frames));
group.bench_with_input(
BenchmarkId::from_parameter(num_stack_frames),
&num_stack_frames,
|b, &num_stack_frames| {
let engine = Engine::default();
let module = module(&engine, num_stack_frames).unwrap();
b.iter_custom(|iters| {
let mut store = Store::new(&engine, ());
let instance = Instance::new(&mut store, &module, &[]).unwrap();
let f = instance.get_typed_func::<(), ()>(&mut store, "").unwrap();
let start = std::time::Instant::now();
for _ in 0..iters {
assert!(f.call(&mut store, ()).is_err());
}
start.elapsed()
});
},
);
}
group.finish()
}
fn bench_host_wasm_frames_traps(c: &mut Criterion) {
let mut group = c.benchmark_group("host-wasm-frames-traps");
let wat = r#"
(module
(import "" "" (func $host_func (param i32)))
(func (export "f") (param i32)
local.get 0
i32.eqz
if
unreachable
end
local.get 0
i32.const 1
i32.sub
call $host_func
)
)
"#;
let engine = Engine::default();
let module = Module::new(&engine, wat).unwrap();
for num_stack_frames in vec![20, 40, 60, 80, 100, 120, 140, 160, 180, 200] {
group.throughput(Throughput::Elements(num_stack_frames));
group.bench_with_input(
BenchmarkId::from_parameter(num_stack_frames),
&num_stack_frames,
|b, &num_stack_frames| {
b.iter_custom(|iters| {
let mut store = Store::new(&engine, ());
let host_func = Func::new(
&mut store,
FuncType::new(&engine, vec![ValType::I32], vec![]),
|mut caller, args, _results| {
let f = caller.get_export("f").unwrap();
let f = f.into_func().unwrap();
f.call(caller, args, &mut [])?;
Ok(())
},
);
let instance = Instance::new(&mut store, &module, &[host_func.into()]).unwrap();
let f = instance
.get_typed_func::<(i32,), ()>(&mut store, "f")
.unwrap();
let start = std::time::Instant::now();
for _ in 0..iters {
assert!(f.call(&mut store, (num_stack_frames as i32,)).is_err());
}
start.elapsed()
});
},
);
}
group.finish()
}
fn module(engine: &Engine, num_funcs: u64) -> Result<Module> {
let mut wat = String::new();
wat.push_str("(module\n");
for i in 0..num_funcs {
let j = i + 1;
wat.push_str(&format!("(func $f{i} call $f{j})\n"));
}
wat.push_str(&format!("(func $f{num_funcs} unreachable)\n"));
wat.push_str(&format!("(export \"\" (func $f0))\n"));
wat.push_str(")\n");
Module::new(engine, &wat)
}
|
