Merge pull request 'performance improvements' (#342) from lx-perf-improvements into main

Performance improvements included in this PR:

- [x] Use `Bytes` at a few places where appropriate, instead of `Vec<u8>`, to reduce the number of copies
  - [x] StreamChunker now accumulates incoming slices in a `Vec<Bytes>` instead of a `VecDeque<u8>`. Replaces calls to `.extend()` and `.drain()` that were quite costly by a simple `concat()` on a vec of slices which is much more optimized
- [x] Hashing (b2, sha256, md5) is now done on a Tokio thread dedicated to cpu-intensive tasks, using `spawn_blocking`
- [x] Block manager now uses 256 independant locks instead of one big lock for writing, reduces contention when writing several/many objects in parallel
- [x] Better LMDB defaults: we now put flags `NoSync` and `NoMetaSync` to avoid `fsync` at each transaction (extremely slow). Also increased number of LMDB readers to accomodate more intensive workloads

Other changes included in this PR:

- [x] Update to hashing and MAC crates: md5 and sha2 from 0.9 to 0.10, hmac from 0.10 to 0.12
- [x] switch to `tracing_subscriber` for logs, which allows to have timing of each event

Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/342

1 files changed, 3 insertions, 1 deletions

diff --git a/src/util/Cargo.toml b/src/util/Cargo.toml
index 163c1b77..d5c194e8 100644
--- a/src/util/Cargo.toml
+++ b/src/util/Cargo.toml
@@ -19,6 +19,8 @@ garage_db = { version = "0.8.0", path = "../db" }
 arc-swap = "1.0"
 async-trait = "0.1"
 blake2 = "0.9"
+bytes = "1.0"
+digest = "0.10"
 err-derive = "0.3"
 git-version = "0.3.4"
 xxhash-rust = { version = "0.8", default-features = false, features = ["xxh3"] }
@@ -26,7 +28,7 @@ hex = "0.4"
 lazy_static = "1.4"
 tracing = "0.1.30"
 rand = "0.8"
-sha2 = "0.9"
+sha2 = "0.10"
 
 chrono = "0.4"
 rmp-serde = "0.15"