mirror of
https://github.com/ClickHouse/ClickHouse.git
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248 lines
8.7 KiB
C++
248 lines
8.7 KiB
C++
#include <lz4.h>
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#include <string.h>
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#include <optional>
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#include <base/types.h>
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#include <IO/ReadBuffer.h>
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#include <IO/ReadBufferFromFileDescriptor.h>
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#include <IO/WriteBufferFromFileDescriptor.h>
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#include <IO/MMapReadBufferFromFileDescriptor.h>
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#include <IO/HashingWriteBuffer.h>
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#include <IO/BufferWithOwnMemory.h>
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#include <Compression/CompressionInfo.h>
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#include <IO/WriteHelpers.h>
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#include <Compression/LZ4_decompress_faster.h>
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#include <IO/copyData.h>
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#include <Common/PODArray.h>
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#include <Common/Stopwatch.h>
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#include <Common/formatReadable.h>
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#include <Common/memcpySmall.h>
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#include <base/unaligned.h>
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/** for i in *.bin; do ./decompress_perf < $i > /dev/null; done
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*/
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int UNKNOWN_COMPRESSION_METHOD;
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extern const int TOO_LARGE_SIZE_COMPRESSED;
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extern const int CANNOT_DECOMPRESS;
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}
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class FasterCompressedReadBufferBase
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{
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protected:
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ReadBuffer * compressed_in;
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/// If 'compressed_in' buffer has whole compressed block - then use it. Otherwise copy parts of data to 'own_compressed_buffer'.
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PODArray<char> own_compressed_buffer;
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/// Points to memory, holding compressed block.
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char * compressed_buffer = nullptr;
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ssize_t variant;
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/// Variant for reference implementation of LZ4.
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static constexpr ssize_t LZ4_REFERENCE = -3;
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LZ4::StreamStatistics stream_stat;
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LZ4::PerformanceStatistics perf_stat;
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size_t readCompressedData(size_t & size_decompressed, size_t & size_compressed_without_checksum)
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{
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if (compressed_in->eof())
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return 0;
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CityHash_v1_0_2::uint128 checksum;
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compressed_in->readStrict(reinterpret_cast<char *>(&checksum), sizeof(checksum));
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own_compressed_buffer.resize(COMPRESSED_BLOCK_HEADER_SIZE);
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compressed_in->readStrict(&own_compressed_buffer[0], COMPRESSED_BLOCK_HEADER_SIZE);
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UInt8 method = own_compressed_buffer[0]; /// See CompressedWriteBuffer.h
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size_t & size_compressed = size_compressed_without_checksum;
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if (method == static_cast<UInt8>(CompressionMethodByte::LZ4) ||
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method == static_cast<UInt8>(CompressionMethodByte::ZSTD) ||
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method == static_cast<UInt8>(CompressionMethodByte::NONE))
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{
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size_compressed = unalignedLoad<UInt32>(&own_compressed_buffer[1]);
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size_decompressed = unalignedLoad<UInt32>(&own_compressed_buffer[5]);
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}
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else
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throw Exception("Unknown compression method: " + toString(method), ErrorCodes::UNKNOWN_COMPRESSION_METHOD);
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if (size_compressed > DBMS_MAX_COMPRESSED_SIZE)
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throw Exception("Too large size_compressed. Most likely corrupted data.", ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
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/// Is whole compressed block located in 'compressed_in' buffer?
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if (compressed_in->offset() >= COMPRESSED_BLOCK_HEADER_SIZE &&
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compressed_in->position() + size_compressed - COMPRESSED_BLOCK_HEADER_SIZE <= compressed_in->buffer().end())
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{
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compressed_in->position() -= COMPRESSED_BLOCK_HEADER_SIZE;
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compressed_buffer = compressed_in->position();
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compressed_in->position() += size_compressed;
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}
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else
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{
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own_compressed_buffer.resize(size_compressed + (variant == LZ4_REFERENCE ? 0 : LZ4::ADDITIONAL_BYTES_AT_END_OF_BUFFER));
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compressed_buffer = &own_compressed_buffer[0];
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compressed_in->readStrict(compressed_buffer + COMPRESSED_BLOCK_HEADER_SIZE, size_compressed - COMPRESSED_BLOCK_HEADER_SIZE);
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}
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return size_compressed + sizeof(checksum);
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}
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void decompress(char * to, size_t size_decompressed, size_t size_compressed_without_checksum)
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{
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UInt8 method = compressed_buffer[0]; /// See CompressedWriteBuffer.h
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if (method == static_cast<UInt8>(CompressionMethodByte::LZ4))
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{
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//LZ4::statistics(compressed_buffer + COMPRESSED_BLOCK_HEADER_SIZE, to, size_decompressed, stat);
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if (variant == LZ4_REFERENCE)
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{
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if (LZ4_decompress_fast(compressed_buffer + COMPRESSED_BLOCK_HEADER_SIZE, to, size_decompressed) < 0)
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throw Exception("Cannot LZ4_decompress_fast", ErrorCodes::CANNOT_DECOMPRESS);
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}
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else
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LZ4::decompress(compressed_buffer + COMPRESSED_BLOCK_HEADER_SIZE, to, size_compressed_without_checksum, size_decompressed, perf_stat);
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}
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else
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throw Exception("Unknown compression method: " + toString(method), ErrorCodes::UNKNOWN_COMPRESSION_METHOD);
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}
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public:
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/// 'compressed_in' could be initialized lazily, but before first call of 'readCompressedData'.
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FasterCompressedReadBufferBase(ReadBuffer * in, ssize_t variant_)
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: compressed_in(in), own_compressed_buffer(COMPRESSED_BLOCK_HEADER_SIZE), variant(variant_), perf_stat(variant)
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{
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}
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LZ4::StreamStatistics getStreamStatistics() const { return stream_stat; }
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LZ4::PerformanceStatistics getPerformanceStatistics() const { return perf_stat; }
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};
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class FasterCompressedReadBuffer : public FasterCompressedReadBufferBase, public BufferWithOwnMemory<ReadBuffer>
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{
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private:
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size_t size_compressed = 0;
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bool nextImpl() override
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{
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size_t size_decompressed;
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size_t size_compressed_without_checksum;
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size_compressed = readCompressedData(size_decompressed, size_compressed_without_checksum);
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if (!size_compressed)
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return false;
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memory.resize(size_decompressed + LZ4::ADDITIONAL_BYTES_AT_END_OF_BUFFER);
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working_buffer = Buffer(&memory[0], &memory[size_decompressed]);
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decompress(working_buffer.begin(), size_decompressed, size_compressed_without_checksum);
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return true;
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}
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public:
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FasterCompressedReadBuffer(ReadBuffer & in_, ssize_t method)
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: FasterCompressedReadBufferBase(&in_, method), BufferWithOwnMemory<ReadBuffer>(0)
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{
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}
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};
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}
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int main(int argc, char ** argv)
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try
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{
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using namespace DB;
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/** -3 - use reference implementation of LZ4
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* -2 - run all algorithms in round robin fashion
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* -1 - automatically detect best algorithm based on statistics
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* 0..3 - run specified algorithm
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*/
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ssize_t variant = argc < 2 ? -1 : parse<ssize_t>(argv[1]);
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MMapReadBufferFromFileDescriptor in(STDIN_FILENO, 0);
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// ReadBufferFromFileDescriptor in(STDIN_FILENO);
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FasterCompressedReadBuffer decompressing_in(in, variant);
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// WriteBufferFromFileDescriptor out(STDOUT_FILENO);
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// HashingWriteBuffer hashing_out(out);
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Stopwatch watch;
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// copyData(decompressing_in, /*hashing_*/out);
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while (!decompressing_in.eof())
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{
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decompressing_in.position() = decompressing_in.buffer().end();
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decompressing_in.next();
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}
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watch.stop();
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std::cout << std::fixed << std::setprecision(3)
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<< watch.elapsed() * 1000 / decompressing_in.count()
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<< '\n';
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/*
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// auto hash = hashing_out.getHash();
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double seconds = watch.elapsedSeconds();
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std::cerr << std::fixed << std::setprecision(3)
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<< "Elapsed: " << seconds
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<< ", " << formatReadableSizeWithBinarySuffix(in.count()) << " compressed"
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<< ", " << formatReadableSizeWithBinarySuffix(decompressing_in.count()) << " decompressed"
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<< ", ratio: " << static_cast<double>(decompressing_in.count()) / in.count()
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<< ", " << formatReadableSizeWithBinarySuffix(in.count() / seconds) << "/sec. compressed"
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<< ", " << formatReadableSizeWithBinarySuffix(decompressing_in.count() / seconds) << "/sec. decompressed"
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// << ", checksum: " << hash.first << "_" << hash.second
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<< "\n";
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// decompressing_in.getStatistics().print();
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LZ4::PerformanceStatistics perf_stat = decompressing_in.getPerformanceStatistics();
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std::optional<size_t> best_variant;
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double best_variant_mean = 0;
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for (size_t i = 0; i < LZ4::PerformanceStatistics::NUM_ELEMENTS; ++i)
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{
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const LZ4::PerformanceStatistics::Element & elem = perf_stat.data[i];
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if (elem.count)
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{
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double mean = elem.mean();
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std::cerr << "Variant " << i << ": "
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<< "count: " << elem.count
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<< ", mean ns/b: " << 1000000000.0 * mean << " (" << formatReadableSizeWithBinarySuffix(1 / mean) << "/sec.)"
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<< ", sigma ns/b: " << 1000000000.0 * elem.sigma()
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<< "\n";
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if (!best_variant || mean < best_variant_mean)
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{
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best_variant_mean = mean;
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best_variant = i;
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}
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}
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}
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if (best_variant)
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std::cerr << "Best variant: " << *best_variant << "\n";
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*/
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return 0;
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}
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catch (...)
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{
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std::cerr << DB::getCurrentExceptionMessage(true);
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return DB::getCurrentExceptionCode();
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}
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