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Evgenii Stratonikov 0272218eb9 [#2184] compression: Properly calculate upper bound 
If the data is not compressible allocating `len(data)` will lead to a
slice reallocation. For a compressible data the results for small size
are flaky and we allocate a bit more. However, it feels right to use a
provided function if we need to pick any size at all.

```
name                                                           old time/op    new time/op    delta
Compression/size=128/zeroed_slice-8                              2.23µs ±12%    2.06µs ± 6%   -7.35%  (p=0.009 n=10+10)
Compression/size=128/not_so_random_slice_(block_=_123)-8         19.0µs ±10%    15.8µs ±16%  -17.09%  (p=0.000 n=9+10)
Compression/size=128/random_slice-8                              17.6µs ±15%    16.1µs ±16%     ~     (p=0.075 n=10+10)
Compression/size=1024/zeroed_slice-8                             3.05µs ±11%    2.84µs ±10%     ~     (p=0.089 n=10+10)
Compression/size=1024/not_so_random_slice_(block_=_123)-8        18.1µs ± 6%    18.2µs ±12%     ~     (p=0.971 n=10+10)
Compression/size=1024/random_slice-8                             48.6µs ± 6%    45.6µs ± 5%   -6.07%  (p=0.006 n=10+9)
Compression/size=32768/zeroed_slice-8                            26.8µs ± 3%    28.7µs ± 8%   +7.23%  (p=0.001 n=10+10)
Compression/size=32768/not_so_random_slice_(block_=_123)-8       44.3µs ± 8%    43.7µs ±13%     ~     (p=0.762 n=8+10)
Compression/size=32768/random_slice-8                            97.3µs ±32%    68.9µs ±15%  -29.13%  (p=0.000 n=10+10)
Compression/size=33554432/zeroed_slice-8                         29.8ms ± 9%    30.3ms ±17%     ~     (p=1.000 n=9+9)
Compression/size=33554432/not_so_random_slice_(block_=_123)-8    33.1ms ±14%    30.3ms ±11%   -8.61%  (p=0.043 n=10+10)
Compression/size=33554432/random_slice-8                         41.7ms ± 3%    30.1ms ± 8%  -27.72%  (p=0.000 n=9+10)

name                                                           old alloc/op   new alloc/op   delta
Compression/size=128/zeroed_slice-8                                128B ± 0%      144B ± 0%  +12.50%  (p=0.000 n=10+10)
Compression/size=128/not_so_random_slice_(block_=_123)-8           384B ± 0%      144B ± 0%  -62.50%  (p=0.000 n=10+10)
Compression/size=128/random_slice-8                                384B ± 0%      144B ± 0%  -62.50%  (p=0.000 n=10+10)
Compression/size=1024/zeroed_slice-8                             1.02kB ± 0%    1.15kB ± 0%  +12.50%  (p=0.000 n=10+10)
Compression/size=1024/not_so_random_slice_(block_=_123)-8        1.02kB ± 0%    1.15kB ± 0%  +12.50%  (p=0.000 n=10+10)
Compression/size=1024/random_slice-8                             2.56kB ± 0%    1.15kB ± 0%  -55.00%  (p=0.000 n=10+10)
Compression/size=32768/zeroed_slice-8                            32.8kB ± 0%    41.0kB ± 0%  +25.00%  (p=0.000 n=10+10)
Compression/size=32768/not_so_random_slice_(block_=_123)-8       32.8kB ± 0%    41.0kB ± 0%  +25.00%  (p=0.000 n=10+10)
Compression/size=32768/random_slice-8                            81.9kB ± 0%    41.0kB ± 0%  -50.00%  (p=0.000 n=10+10)
Compression/size=33554432/zeroed_slice-8                         33.6MB ± 0%    33.6MB ± 0%   +0.02%  (p=0.000 n=9+9)
Compression/size=33554432/not_so_random_slice_(block_=_123)-8    33.6MB ± 0%    33.6MB ± 0%   +0.02%  (p=0.000 n=8+10)
Compression/size=33554432/random_slice-8                         75.5MB ± 0%    33.6MB ± 0%  -55.55%  (p=0.000 n=10+10)

name                                                           old allocs/op  new allocs/op  delta
Compression/size=128/zeroed_slice-8                                1.00 ± 0%      1.00 ± 0%     ~     (all equal)
Compression/size=128/not_so_random_slice_(block_=_123)-8           2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
Compression/size=128/random_slice-8                                2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
Compression/size=1024/zeroed_slice-8                               1.00 ± 0%      1.00 ± 0%     ~     (all equal)
Compression/size=1024/not_so_random_slice_(block_=_123)-8          1.00 ± 0%      1.00 ± 0%     ~     (all equal)
Compression/size=1024/random_slice-8                               2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
Compression/size=32768/zeroed_slice-8                              1.00 ± 0%      1.00 ± 0%     ~     (all equal)
Compression/size=32768/not_so_random_slice_(block_=_123)-8         1.00 ± 0%      1.00 ± 0%     ~     (all equal)
Compression/size=32768/random_slice-8                              2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
Compression/size=33554432/zeroed_slice-8                           1.00 ± 0%      1.00 ± 0%     ~     (all equal)
Compression/size=33554432/not_so_random_slice_(block_=_123)-8      1.00 ± 0%      1.00 ± 0%     ~     (all equal)
Compression/size=33554432/random_slice-8                           2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
```

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
2022-12-30 11:07:35 +03:00
..
blobovniczatree [#2175] blobovniczatree: Close all non-active blobovniczas 2022-12-30 11:07:35 +03:00
common Move to frostfs-node 2022-12-28 15:04:29 +03:00
compression [#2184] compression: Properly calculate upper bound 2022-12-30 11:07:35 +03:00
fstree Move to frostfs-node 2022-12-28 15:04:29 +03:00
internal/blobstortest Move to frostfs-node 2022-12-28 15:04:29 +03:00
blobstor.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
blobstor_test.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
control.go [#1523] blobstor: Rename compression.CConfig to Config 2022-08-22 13:14:19 +03:00
delete.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
exists.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
exists_test.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
generic_test.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
get.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
get_range.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
info.go [#2057] blobstor: Block operations on a mode change 2022-11-19 11:01:04 +03:00
iterate.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
iterate_test.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
logger.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
mode.go Move to frostfs-node 2022-12-28 15:04:29 +03:00
put.go Move to frostfs-node 2022-12-28 15:04:29 +03:00