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syncthing/lib/db
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Gusted 356c5055ad
lib/sha256: Remove it (#9643) 
### Purpose

Remove the `lib/sha256` package, because it's no longer necessary. Go's
standard library now has the same performance and is on par with
`sha256-simd` since [Since Go
1.21](1a64574f42).
Therefore using `sha256-simd` has no benefits anymore.

ARM already has optimized sha256 assembly code since
7b8a7f8272,
`sha256-simd` published their results before that optimized assembly was
implemented,
f941fedda8.
The assembly looks very similar and the benchmarks in the Go commit
match that of `sha256-simd`.

This patch removes all of the related code of `lib/sha256` and makes
`crypto/sha256` the 'default'.

Benchmark of `sha256-simd` and `crypto/sha256`:
<details>

```
cpu: AMD Ryzen 5 3600X 6-Core Processor
                │  simd.txt   │               go.txt                │
                │   sec/op    │    sec/op     vs base               │
Hash/8Bytes-12    63.25n ± 1%    73.38n ± 1%  +16.02% (p=0.002 n=6)
Hash/64Bytes-12   98.73n ± 1%   105.30n ± 1%   +6.65% (p=0.002 n=6)
Hash/1K-12        567.2n ± 1%    572.8n ± 1%   +0.99% (p=0.002 n=6)
Hash/8K-12        4.062µ ± 1%    4.062µ ± 1%        ~ (p=0.396 n=6)
Hash/1M-12        512.1µ ± 0%    510.6µ ± 1%        ~ (p=0.485 n=6)
Hash/5M-12        2.556m ± 1%    2.564m ± 0%        ~ (p=0.093 n=6)
Hash/10M-12       5.112m ± 0%    5.127m ± 0%        ~ (p=0.093 n=6)
geomean           13.82µ         14.27µ        +3.28%

                │   simd.txt   │               go.txt                │
                │     B/s      │     B/s       vs base               │
Hash/8Bytes-12    120.6Mi ± 1%   104.0Mi ± 1%  -13.81% (p=0.002 n=6)
Hash/64Bytes-12   618.2Mi ± 1%   579.8Mi ± 1%   -6.22% (p=0.002 n=6)
Hash/1K-12        1.682Gi ± 1%   1.665Gi ± 1%   -0.98% (p=0.002 n=6)
Hash/8K-12        1.878Gi ± 1%   1.878Gi ± 1%        ~ (p=0.310 n=6)
Hash/1M-12        1.907Gi ± 0%   1.913Gi ± 1%        ~ (p=0.485 n=6)
Hash/5M-12        1.911Gi ± 1%   1.904Gi ± 0%        ~ (p=0.093 n=6)
Hash/10M-12       1.910Gi ± 0%   1.905Gi ± 0%        ~ (p=0.093 n=6)
geomean           1.066Gi        1.032Gi        -3.18%
```

</details>


### Testing

Compiled and tested on Linux.

### Documentation

https://github.com/syncthing/docs/pull/874
2024-08-10 12:58:20 +01:00
..
backend lib/db: Correct function name in comments (#9520) 2024-05-16 07:02:57 +00:00
testdata lib/db, lib/model: Keep need stats in metadata (ref #5899) (#6413) 2020-05-11 15:07:06 +02:00
.gitignore Change DB label format (index folders, devices) 2016-01-03 19:32:40 +01:00
benchmark_test.go lib/db, lib/model: Remove filesystem state from FileSet (fixes #7850) (#8151) 2022-01-31 10:12:52 +01:00
blockmap_test.go all: Handle errors opening db/creating file-set (ref #5907) (#7150) 2020-12-21 12:59:22 +01:00
blockmap.go lib/db: Remove unused blockFinder global (#6534) 2020-04-14 17:09:59 +02:00
db_test.go all: Fix various user-facing and non-user-facing typos (#8509) 2022-08-23 15:44:11 +02:00
debug.go all, lib/logger: Refactor SetDebug calls (#6054) 2019-10-04 13:03:34 +02:00
keyer_test.go all: Handle errors opening db/creating file-set (ref #5907) (#7150) 2020-12-21 12:59:22 +01:00
keyer.go lib/db: Drop indexes for outgoing data to force refresh (ref #9496) (#9502) 2024-04-08 11:14:27 +02:00
lowlevel.go lib/sha256: Remove it (#9643) 2024-08-10 12:58:20 +01:00
meta_test.go lib/db, lib/model: Remove filesystem state from FileSet (fixes #7850) (#8151) 2022-01-31 10:12:52 +01:00
meta.go all: Minor staticcheck fixes (#8939) 2023-06-19 06:50:53 +00:00
namespaced_test.go all: Handle errors opening db/creating file-set (ref #5907) (#7150) 2020-12-21 12:59:22 +01:00
namespaced.go lib/db: Correct function name in comments (#9520) 2024-05-16 07:02:57 +00:00
observed.go lib/db, lib/model: Improve error handling on pending items (#7754) 2021-06-09 13:35:17 +02:00
schemaupdater.go lib/db: Drop indexes for outgoing data to force refresh (ref #9496) (#9502) 2024-04-08 11:14:27 +02:00
set_test.go all: Fix various user-facing and non-user-facing typos (#8509) 2022-08-23 15:44:11 +02:00
set.go lib/db: Hold update lock while taking snapshot (#9496) 2024-04-05 21:32:43 +02:00
smallindex_test.go all: Handle errors opening db/creating file-set (ref #5907) (#7150) 2020-12-21 12:59:22 +01:00
smallindex.go Implement database abstraction, error checking (ref #5907) (#6107) 2019-11-29 09:11:52 +01:00
structs.go lib/db: Correct function name in comments (#9520) 2024-05-16 07:02:57 +00:00
structs.pb.go all: Support syncing extended attributes (fixes #2698) (#8513) 2022-09-14 09:50:55 +02:00
transactions.go lib/db: Constant/unused args and return values, double it.Release (#8259) 2022-04-27 20:32:44 +02:00
util_test.go lib/db, lib/model: Remove filesystem state from FileSet (fixes #7850) (#8151) 2022-01-31 10:12:52 +01:00
util.go lib/model, lib/protocol: Remove FileInfoBatch reuse behavior (#9399) 2024-02-10 19:16:27 +01:00