mirror of
https://github.com/minio/minio.git
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c0721164be
Update reedsolomon library to enable feature to automatically set number of go-routines based on the input shard size, since shard size is sort of a constant in Minio for objects > 10MiB (default blocksize) klauspost reported around 15-20% improvement in performance numbers on older systems such as AVX and SSE3 ``` name old speed new speed delta Encode10x2x10000-8 5.45GB/s ± 1% 6.22GB/s ± 1% +14.20% (p=0.000 n=9+9) Encode100x20x10000-8 1.44GB/s ± 1% 1.64GB/s ± 1% +13.77% (p=0.000 n=10+10) Encode17x3x1M-8 10.0GB/s ± 5% 12.0GB/s ± 1% +19.88% (p=0.000 n=10+10) Encode10x4x16M-8 7.81GB/s ± 5% 8.56GB/s ± 5% +9.58% (p=0.000 n=10+9) Encode5x2x1M-8 15.3GB/s ± 2% 19.6GB/s ± 2% +28.57% (p=0.000 n=9+10) Encode10x2x1M-8 12.2GB/s ± 5% 15.0GB/s ± 5% +22.45% (p=0.000 n=10+10) Encode10x4x1M-8 7.84GB/s ± 1% 9.03GB/s ± 1% +15.19% (p=0.000 n=9+9) Encode50x20x1M-8 1.73GB/s ± 4% 2.09GB/s ± 4% +20.59% (p=0.000 n=10+9) Encode17x3x16M-8 10.6GB/s ± 1% 11.7GB/s ± 4% +10.12% (p=0.000 n=8+10) ```
314 lines
20 KiB
Go
314 lines
20 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"bytes"
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crand "crypto/rand"
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"io"
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"math/rand"
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"testing"
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humanize "github.com/dustin/go-humanize"
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)
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func (d badDisk) ReadFile(volume string, path string, offset int64, buf []byte, verifier *BitrotVerifier) (n int64, err error) {
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return 0, errFaultyDisk
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}
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var erasureReadFileTests = []struct {
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dataBlocks int
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onDisks, offDisks int
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blocksize, data int64
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offset int64
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length int64
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algorithm BitrotAlgorithm
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shouldFail, shouldFailQuorum bool
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}{
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{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 0
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{dataBlocks: 3, onDisks: 6, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: SHA256, shouldFail: false, shouldFailQuorum: false}, // 1
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{dataBlocks: 4, onDisks: 8, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 2
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{dataBlocks: 5, onDisks: 10, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 1, length: oneMiByte - 1, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 3
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{dataBlocks: 6, onDisks: 12, offDisks: 0, blocksize: int64(oneMiByte), data: oneMiByte, offset: oneMiByte, length: 0, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 4
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{dataBlocks: 7, onDisks: 14, offDisks: 0, blocksize: int64(oneMiByte), data: oneMiByte, offset: 3, length: 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 5
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{dataBlocks: 8, onDisks: 16, offDisks: 0, blocksize: int64(oneMiByte), data: oneMiByte, offset: 4, length: 8 * 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 6
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{dataBlocks: 7, onDisks: 14, offDisks: 7, blocksize: int64(blockSizeV1), data: oneMiByte, offset: oneMiByte, length: 1, algorithm: DefaultBitrotAlgorithm, shouldFail: true, shouldFailQuorum: false}, // 7
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{dataBlocks: 6, onDisks: 12, offDisks: 6, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 8
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{dataBlocks: 5, onDisks: 10, offDisks: 5, blocksize: int64(oneMiByte), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 9
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{dataBlocks: 4, onDisks: 8, offDisks: 4, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: SHA256, shouldFail: false, shouldFailQuorum: false}, // 10
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{dataBlocks: 3, onDisks: 6, offDisks: 3, blocksize: int64(oneMiByte), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 11
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{dataBlocks: 2, onDisks: 4, offDisks: 2, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 12
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{dataBlocks: 2, onDisks: 4, offDisks: 1, blocksize: int64(oneMiByte), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 13
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{dataBlocks: 3, onDisks: 6, offDisks: 2, blocksize: int64(oneMiByte), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 14
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{dataBlocks: 4, onDisks: 8, offDisks: 3, blocksize: int64(2 * oneMiByte), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 15
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{dataBlocks: 5, onDisks: 10, offDisks: 6, blocksize: int64(oneMiByte), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true}, // 16
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{dataBlocks: 5, onDisks: 10, offDisks: 2, blocksize: int64(blockSizeV1), data: 2 * oneMiByte, offset: oneMiByte, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 17
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{dataBlocks: 5, onDisks: 10, offDisks: 1, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 18
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{dataBlocks: 6, onDisks: 12, offDisks: 3, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: SHA256, shouldFail: false, shouldFailQuorum: false}, // 19
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{dataBlocks: 6, onDisks: 12, offDisks: 7, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true}, // 20
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{dataBlocks: 8, onDisks: 16, offDisks: 8, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 21
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{dataBlocks: 8, onDisks: 16, offDisks: 9, blocksize: int64(oneMiByte), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true}, // 22
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{dataBlocks: 8, onDisks: 16, offDisks: 7, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 23
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{dataBlocks: 2, onDisks: 4, offDisks: 1, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 24
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{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 25
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{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: 0, shouldFail: true, shouldFailQuorum: false}, // 26
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{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(blockSizeV1) + 1, offset: 0, length: int64(blockSizeV1) + 1, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 27
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{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 12, length: int64(blockSizeV1) + 17, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 28
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{dataBlocks: 3, onDisks: 6, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 1023, length: int64(blockSizeV1) + 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 29
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{dataBlocks: 4, onDisks: 8, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 11, length: int64(blockSizeV1) + 2*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 30
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{dataBlocks: 6, onDisks: 12, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 512, length: int64(blockSizeV1) + 8*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 31
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{dataBlocks: 8, onDisks: 16, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: int64(blockSizeV1), length: int64(blockSizeV1) - 1, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 32
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{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(oneMiByte), offset: -1, length: 3, algorithm: DefaultBitrotAlgorithm, shouldFail: true, shouldFailQuorum: false}, // 33
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{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(oneMiByte), offset: 1024, length: -1, algorithm: DefaultBitrotAlgorithm, shouldFail: true, shouldFailQuorum: false}, // 34
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{dataBlocks: 4, onDisks: 6, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(blockSizeV1), offset: 0, length: int64(blockSizeV1), algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 35
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{dataBlocks: 4, onDisks: 6, offDisks: 1, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 12, length: int64(blockSizeV1) + 17, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false}, // 36
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{dataBlocks: 4, onDisks: 6, offDisks: 3, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 1023, length: int64(blockSizeV1) + 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true}, // 37
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{dataBlocks: 8, onDisks: 12, offDisks: 4, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 11, length: int64(blockSizeV1) + 2*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 38
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}
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func TestErasureReadFile(t *testing.T) {
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for i, test := range erasureReadFileTests {
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setup, err := newErasureTestSetup(test.dataBlocks, test.onDisks-test.dataBlocks, test.blocksize)
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if err != nil {
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t.Fatalf("Test %d: failed to create test setup: %v", i, err)
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}
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storage, err := NewErasureStorage(setup.disks, test.dataBlocks, test.onDisks-test.dataBlocks, test.blocksize)
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if err != nil {
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setup.Remove()
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t.Fatalf("Test %d: failed to create ErasureStorage: %v", i, err)
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}
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data := make([]byte, test.data)
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if _, err = io.ReadFull(crand.Reader, data); err != nil {
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setup.Remove()
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t.Fatalf("Test %d: failed to generate random test data: %v", i, err)
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}
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writeAlgorithm := test.algorithm
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if !test.algorithm.Available() {
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writeAlgorithm = DefaultBitrotAlgorithm
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}
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buffer := make([]byte, test.blocksize, 2*test.blocksize)
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file, err := storage.CreateFile(bytes.NewReader(data[:]), "testbucket", "object", buffer, writeAlgorithm, test.dataBlocks+1)
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if err != nil {
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setup.Remove()
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t.Fatalf("Test %d: failed to create erasure test file: %v", i, err)
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}
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writer := bytes.NewBuffer(nil)
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readInfo, err := storage.ReadFile(writer, "testbucket", "object", test.offset, test.length, test.data, file.Checksums, test.algorithm, test.blocksize)
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if err != nil && !test.shouldFail {
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t.Errorf("Test %d: should pass but failed with: %v", i, err)
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}
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if err == nil && test.shouldFail {
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t.Errorf("Test %d: should fail but it passed", i)
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}
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if err == nil {
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if readInfo.Size != test.length {
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t.Errorf("Test %d: read returns wrong number of bytes: got: #%d want: #%d", i, readInfo.Size, test.length)
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}
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if readInfo.Algorithm != test.algorithm {
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t.Errorf("Test %d: read returns wrong algorithm: got: %v want: %v", i, readInfo.Algorithm, test.algorithm)
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}
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if content := writer.Bytes(); !bytes.Equal(content, data[test.offset:test.offset+test.length]) {
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t.Errorf("Test %d: read retruns wrong file content", i)
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}
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}
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if err == nil && !test.shouldFail {
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writer.Reset()
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for j := range storage.disks[:test.offDisks] {
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storage.disks[j] = badDisk{nil}
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}
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if test.offDisks > 0 {
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storage.disks[0] = OfflineDisk
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}
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readInfo, err = storage.ReadFile(writer, "testbucket", "object", test.offset, test.length, test.data, file.Checksums, test.algorithm, test.blocksize)
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if err != nil && !test.shouldFailQuorum {
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t.Errorf("Test %d: should pass but failed with: %v", i, err)
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}
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if err == nil && test.shouldFailQuorum {
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t.Errorf("Test %d: should fail but it passed", i)
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}
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if !test.shouldFailQuorum {
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if readInfo.Size != test.length {
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t.Errorf("Test %d: read returns wrong number of bytes: got: #%d want: #%d", i, readInfo.Size, test.length)
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}
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if readInfo.Algorithm != test.algorithm {
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t.Errorf("Test %d: read returns wrong algorithm: got: %v want: %v", i, readInfo.Algorithm, test.algorithm)
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}
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if content := writer.Bytes(); !bytes.Equal(content, data[test.offset:test.offset+test.length]) {
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t.Errorf("Test %d: read retruns wrong file content", i)
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}
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}
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}
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setup.Remove()
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}
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}
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// Test erasureReadFile with random offset and lengths.
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// This test is t.Skip()ed as it a long time to run, hence should be run
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// explicitly after commenting out t.Skip()
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func TestErasureReadFileRandomOffsetLength(t *testing.T) {
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// Comment the following line to run this test.
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t.SkipNow()
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// Initialize environment needed for the test.
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dataBlocks := 7
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parityBlocks := 7
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blockSize := int64(1 * humanize.MiByte)
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setup, err := newErasureTestSetup(dataBlocks, parityBlocks, blockSize)
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if err != nil {
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t.Error(err)
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return
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}
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defer setup.Remove()
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storage, err := NewErasureStorage(setup.disks, dataBlocks, parityBlocks, blockSize)
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if err != nil {
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t.Fatalf("failed to create ErasureStorage: %v", err)
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}
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// Prepare a slice of 5MiB with random data.
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data := make([]byte, 5*humanize.MiByte)
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length := int64(len(data))
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_, err = rand.Read(data)
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if err != nil {
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t.Fatal(err)
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}
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// 10000 iterations with random offsets and lengths.
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iterations := 10000
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// Create a test file to read from.
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buffer := make([]byte, blockSize, 2*blockSize)
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file, err := storage.CreateFile(bytes.NewReader(data), "testbucket", "testobject", buffer, DefaultBitrotAlgorithm, dataBlocks+1)
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if err != nil {
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t.Fatal(err)
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}
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if file.Size != length {
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t.Errorf("erasureCreateFile returned %d, expected %d", file.Size, length)
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}
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// To generate random offset/length.
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r := rand.New(rand.NewSource(UTCNow().UnixNano()))
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buf := &bytes.Buffer{}
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// Verify erasureReadFile() for random offsets and lengths.
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for i := 0; i < iterations; i++ {
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offset := r.Int63n(length)
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readLen := r.Int63n(length - offset)
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expected := data[offset : offset+readLen]
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_, err = storage.ReadFile(buf, "testbucket", "testobject", offset, readLen, length, file.Checksums, DefaultBitrotAlgorithm, blockSize)
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if err != nil {
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t.Fatal(err, offset, readLen)
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}
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got := buf.Bytes()
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if !bytes.Equal(expected, got) {
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t.Fatalf("read data is different from what was expected, offset=%d length=%d", offset, readLen)
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}
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buf.Reset()
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}
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}
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// Benchmarks
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func benchmarkErasureRead(data, parity, dataDown, parityDown int, size int64, b *testing.B) {
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setup, err := newErasureTestSetup(data, parity, blockSizeV1)
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if err != nil {
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b.Fatalf("failed to create test setup: %v", err)
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}
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defer setup.Remove()
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storage, err := NewErasureStorage(setup.disks, data, parity, blockSizeV1)
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if err != nil {
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b.Fatalf("failed to create ErasureStorage: %v", err)
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}
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content := make([]byte, size)
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buffer := make([]byte, blockSizeV1, 2*blockSizeV1)
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file, err := storage.CreateFile(bytes.NewReader(content), "testbucket", "object", buffer, DefaultBitrotAlgorithm, data+1)
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if err != nil {
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b.Fatalf("failed to create erasure test file: %v", err)
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}
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checksums := file.Checksums
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for i := 0; i < dataDown; i++ {
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storage.disks[i] = OfflineDisk
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}
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for i := data; i < data+parityDown; i++ {
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storage.disks[i] = OfflineDisk
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}
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b.ResetTimer()
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b.SetBytes(size)
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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if file, err = storage.ReadFile(bytes.NewBuffer(content[:0]), "testbucket", "object", 0, size, size, checksums, DefaultBitrotAlgorithm, blockSizeV1); err != nil {
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panic(err)
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}
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}
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}
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func BenchmarkErasureReadQuick(b *testing.B) {
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const size = 12 * 1024 * 1024
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b.Run(" 00|00 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 0, 0, size, b) })
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b.Run(" 00|X0 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 0, 1, size, b) })
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b.Run(" X0|00 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 1, 0, size, b) })
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b.Run(" X0|X0 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 1, 1, size, b) })
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}
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func BenchmarkErasureRead_4_64KB(b *testing.B) {
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const size = 64 * 1024
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b.Run(" 00|00 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 0, 0, size, b) })
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b.Run(" 00|X0 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 0, 1, size, b) })
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b.Run(" X0|00 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 1, 0, size, b) })
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b.Run(" X0|X0 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 1, 1, size, b) })
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b.Run(" 00|XX ", func(b *testing.B) { benchmarkErasureRead(2, 2, 0, 2, size, b) })
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b.Run(" XX|00 ", func(b *testing.B) { benchmarkErasureRead(2, 2, 2, 0, size, b) })
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}
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func BenchmarkErasureRead_8_20MB(b *testing.B) {
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const size = 20 * 1024 * 1024
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b.Run(" 0000|0000 ", func(b *testing.B) { benchmarkErasureRead(4, 4, 0, 0, size, b) })
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b.Run(" 0000|X000 ", func(b *testing.B) { benchmarkErasureRead(4, 4, 0, 1, size, b) })
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b.Run(" X000|0000 ", func(b *testing.B) { benchmarkErasureRead(4, 4, 1, 0, size, b) })
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b.Run(" X000|X000 ", func(b *testing.B) { benchmarkErasureRead(4, 4, 1, 1, size, b) })
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b.Run(" 0000|XXXX ", func(b *testing.B) { benchmarkErasureRead(4, 4, 0, 4, size, b) })
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b.Run(" XX00|XX00 ", func(b *testing.B) { benchmarkErasureRead(4, 4, 2, 2, size, b) })
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b.Run(" XXXX|0000 ", func(b *testing.B) { benchmarkErasureRead(4, 4, 4, 0, size, b) })
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}
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func BenchmarkErasureRead_12_30MB(b *testing.B) {
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const size = 30 * 1024 * 1024
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b.Run(" 000000|000000 ", func(b *testing.B) { benchmarkErasureRead(6, 6, 0, 0, size, b) })
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b.Run(" 000000|X00000 ", func(b *testing.B) { benchmarkErasureRead(6, 6, 0, 1, size, b) })
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b.Run(" X00000|000000 ", func(b *testing.B) { benchmarkErasureRead(6, 6, 1, 0, size, b) })
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b.Run(" X00000|X00000 ", func(b *testing.B) { benchmarkErasureRead(6, 6, 1, 1, size, b) })
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b.Run(" 000000|XXXXXX ", func(b *testing.B) { benchmarkErasureRead(6, 6, 0, 6, size, b) })
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b.Run(" XXX000|XXX000 ", func(b *testing.B) { benchmarkErasureRead(6, 6, 3, 3, size, b) })
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b.Run(" XXXXXX|000000 ", func(b *testing.B) { benchmarkErasureRead(6, 6, 6, 0, size, b) })
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}
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func BenchmarkErasureRead_16_40MB(b *testing.B) {
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const size = 40 * 1024 * 1024
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b.Run(" 00000000|00000000 ", func(b *testing.B) { benchmarkErasureRead(8, 8, 0, 0, size, b) })
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b.Run(" 00000000|X0000000 ", func(b *testing.B) { benchmarkErasureRead(8, 8, 0, 1, size, b) })
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b.Run(" X0000000|00000000 ", func(b *testing.B) { benchmarkErasureRead(8, 8, 1, 0, size, b) })
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b.Run(" X0000000|X0000000 ", func(b *testing.B) { benchmarkErasureRead(8, 8, 1, 1, size, b) })
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b.Run(" 00000000|XXXXXXXX ", func(b *testing.B) { benchmarkErasureRead(8, 8, 0, 8, size, b) })
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b.Run(" XXXX0000|XXXX0000 ", func(b *testing.B) { benchmarkErasureRead(8, 8, 4, 4, size, b) })
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b.Run(" XXXXXXXX|00000000 ", func(b *testing.B) { benchmarkErasureRead(8, 8, 8, 0, size, b) })
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}
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