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authorAlex <alex@adnab.me>2022-09-12 16:38:43 +0200
committerAlex <alex@adnab.me>2022-09-12 16:38:43 +0200
commit309d7aef3f05657e2b969ab72442b2f2c350da03 (patch)
tree448704ae3f07a10f86fcb5d40347ad70cdd81498 /doc/book/design/_index.md
parent03c40a0b24dd5bd2a51d3cd3df0ca1a42fb2d328 (diff)
parentf91fab8582728f176f446a4a2e039d22f752167b (diff)
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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
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