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denoland-deno/cli/bench/encode_into.js
Divy Srivastava 9b2b8df927
feat(ops): Fast zero copy string arguments (#16777)
Uses SeqOneByteString optimization to do zero-copy `&str` arguments in
fast calls.

- [x] Depends on https://github.com/denoland/rusty_v8/pull/1129
- [x] Depends on
https://chromium-review.googlesource.com/c/v8/v8/+/4036884
- [x] Disable in async ops
- [x] Make it work with owned `String` with an extra alloc in fast path.
- [x] Support `Cow<'_, str>`. Owned for slow case, Borrowed for fast
case

```rust
#[op]
fn op_string_len(s: &str) -> u32 { 
  str.len() as u32 
}
```
2022-12-02 05:29:15 +00:00

22 lines
672 B
JavaScript

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
let [total, count] = typeof Deno !== "undefined"
? Deno.args
: [process.argv[2], process.argv[3]];
total = total ? parseInt(total, 0) : 50;
count = count ? parseInt(count, 10) : 10000000;
function bench(fun) {
const start = Date.now();
for (let i = 0; i < count; i++) fun();
const elapsed = Date.now() - start;
const rate = Math.floor(count / (elapsed / 1000));
console.log(`time ${elapsed} ms rate ${rate}`);
if (--total) bench(fun);
}
const encoder = new TextEncoder();
const data = "hello world";
const out = new Uint8Array(100);
bench(() => encoder.encodeInto(data, out));