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0bc34952eb
md5sum calculation has a high CPU overhead, avoid calculating
it repeatedly for similar fanOut calls.
To fix following CPU profiler result
```
(pprof) top10
Showing nodes accounting for 678.68s, 84.67% of 801.54s total
Dropped 1072 nodes (cum <= 4.01s)
Showing top 10 nodes out of 156
flat flat% sum% cum cum%
332.54s 41.49% 41.49% 332.54s 41.49% runtime/internal/syscall.Syscall6
228.39s 28.49% 69.98% 228.39s 28.49% crypto/md5.block
48.07s 6.00% 75.98% 48.07s 6.00% runtime.memmove
28.91s 3.61% 79.59% 28.91s 3.61% github.com/minio/highwayhash.updateAVX2
8.25s 1.03% 80.61% 8.25s 1.03% runtime.futex
8.25s 1.03% 81.64% 10.81s 1.35% runtime.step
6.99s 0.87% 82.52% 22.35s 2.79% runtime.pcvalue
6.67s 0.83% 83.35% 38.90s 4.85% runtime.mallocgc
5.77s 0.72% 84.07% 32.61s 4.07% runtime.gentraceback
4.84s 0.6% 84.67% 10.49s 1.31% runtime.lock2
```
|
||
|---|---|---|
| .. | ||
| sha256 | ||
| checksum.go | ||
| errors.go | ||
| reader_test.go | ||
| reader.go | ||