4 files changed, 62 insertions, 9 deletions
diff --git a/cli/bench/stdio/README.md b/cli/bench/stdio/README.md
new file mode 100644
index 000000000..b2d4875ac
--- /dev/null
+++ b/cli/bench/stdio/README.md
@@ -0,0 +1,9 @@
+## `stdio` benchmarks
+
+Compile the C baseline and run the benchmark:
+
+```bash
+cc stdio.c -o stdio -O3
+time dd if=/dev/zero bs=65536 count=500000 | ./stdio
+time dd if=/dev/zero bs=65536 count=500000 | deno run stdio.js
+```
diff --git a/cli/bench/stdio/stdio.c b/cli/bench/stdio/stdio.c
new file mode 100644
index 000000000..8125a0d00
--- /dev/null
+++ b/cli/bench/stdio/stdio.c
@@ -0,0 +1,29 @@
+// From https://github.com/just-js/benchmarks/tree/main/01-stdio
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+int main(int argc, char *argv[]) {
+  unsigned int blocksize = 65536;
+  if (argc == 2) {
+    blocksize = atoi(argv[1]);
+  }
+  char buf[blocksize];
+  unsigned long size = 0;
+  unsigned int reads = 0;
+  int n = read(STDIN_FILENO, buf, blocksize);
+  while (n > 0) {
+    reads++;
+    size += n;
+    n = read(STDIN_FILENO, buf, blocksize);
+  }
+  if (n < 0) {
+    fprintf(stderr, "read: %s (%i)\n", strerror(errno), errno);
+    exit(1);
+  }
+  fprintf(stdout, "size %lu reads %u blocksize %u\n", size, reads, blocksize);
+}
+\ No newline at end of file
diff --git a/cli/bench/stdio/stdio.js b/cli/bench/stdio/stdio.js
new file mode 100644
index 000000000..0663d6fd7
--- /dev/null
+++ b/cli/bench/stdio/stdio.js
@@ -0,0 +1,16 @@
+// From https://github.com/just-js/benchmarks/tree/main/01-stdio
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+const blocksize = parseInt(Deno.args[0] || 65536);
+const buf = new Uint8Array(blocksize);
+let size = 0;
+let reads = 0;
+
+let n = Deno.stdin.readSync(buf);
+while (n > 0) {
+  reads++;
+  size += n;
+  n = Deno.stdin.readSync(buf);
+}
+if (n < 0) throw new Error("Bad Read");
+console.log(`size ${size} reads ${reads} blocksize ${blocksize}`);
diff --git a/runtime/ops/io.rs b/runtime/ops/io.rs
index fd5b8a962..186052afe 100644
--- a/runtime/ops/io.rs
+++ b/runtime/ops/io.rs
@@ -16,7 +16,6 @@ use deno_core::OpState;
 use deno_core::RcRef;
 use deno_core::Resource;
 use deno_core::ResourceId;
-use deno_core::ZeroCopyBuf;
 use once_cell::sync::Lazy;
 use std::borrow::Cow;
 use std::cell::RefCell;
@@ -683,32 +682,32 @@ pub fn op_print(
   })
 }
 
-#[op]
+#[op(fast)]
 fn op_read_sync(
   state: &mut OpState,
-  rid: ResourceId,
-  mut buf: ZeroCopyBuf,
+  rid: u32,
+  buf: &mut [u8],
 ) -> Result<u32, AnyError> {
   StdFileResource::with_resource(state, rid, move |resource| {
     resource.with_inner_and_metadata(|inner, _| {
       inner
-        .read(&mut buf)
+        .read(buf)
         .map(|n: usize| n as u32)
         .map_err(AnyError::from)
     })
   })
 }
 
-#[op]
+#[op(fast)]
 fn op_write_sync(
   state: &mut OpState,
-  rid: ResourceId,
-  buf: ZeroCopyBuf,
+  rid: u32,
+  buf: &mut [u8],
 ) -> Result<u32, AnyError> {
   StdFileResource::with_resource(state, rid, move |resource| {
     resource.with_inner_and_metadata(|inner, _| {
       inner
-        .write_and_maybe_flush(&buf)
+        .write_and_maybe_flush(buf)
         .map(|nwritten: usize| nwritten as u32)
         .map_err(AnyError::from)
     })