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build: avoid fat LTO in local Cargo profiles (#3996)

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Local benchmarks currently inherit the release profile's fat LTO and
single codegen unit, making local iteration pay release-artifact build
costs.

Provide repository-defined profiles for no-LTO local work and cheaper
benchmark builds, and document when each profile is appropriate. Release
artifacts continue to use fat LTO.
This commit is contained in:
Xuanwo
2026-08-21 16:42:59 +08:00
committed by GitHub
parent 7adcffc2b4
commit 09843410ec
4 changed files with 19 additions and 4 deletions
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rust/lancedb/examples/bench_open_missing_table.rs
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@@ -1,14 +1,14 @@
// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright The LanceDB Authors
// Release benchmark for opening a missing table as sibling-table cardinality grows.
// Benchmark for opening a missing table as sibling-table cardinality grows.
//
// The fixture uses real `.lance` directories and marker files. Fixture creation is
// outside the timed section. Defaults intentionally cover 1k, 10k, and 100k siblings
// with 10 warmups and 100 distinct missing-table opens per scale:
//
// ```text
// cargo run --release -p lancedb --example bench_open_missing_table
// cargo run --profile release-no-lto -p lancedb --example bench_open_missing_table
// ```
//
// `BENCH_SIBLINGS`, `BENCH_WARMUPS`, and `BENCH_TRIALS` override those defaults.
rust/lancedb/examples/bench_streaming_dataloader.rs
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@@ -5,10 +5,10 @@
//! streaming dataloader.
//!
//! Normal sweep:
//! cargo run --release --example bench_streaming_dataloader
//! cargo run --profile release-with-debug --example bench_streaming_dataloader
//!
//! Flamegraph (self-contained, no perf/dtrace needed):
//! BENCH_PROFILE=1 BENCH_CHUNK=64 cargo run --release \
//! BENCH_PROFILE=1 BENCH_CHUNK=64 cargo run --profile release-with-debug \
//! --example bench_streaming_dataloader
//! # writes flamegraph.svg in the current directory
//!