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tracy/server/TracyFileRead.hpp
Bartosz Taudul eb79507501 Read files using mmap.
2020-02-12 19:43:05 +01:00

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#ifndef __TRACYFILEREAD_HPP__
#define __TRACYFILEREAD_HPP__
#include <assert.h>
#include <atomic>
#include <algorithm>
#include <stdexcept>
#include <stdio.h>
#include <string.h>
#include <string>
#include <thread>
#include <utility>
#include <sys/stat.h>
#ifdef _MSC_VER
# define stat64 _stat64
#endif
#ifdef __CYGWIN__
# define stat64 stat
#endif
#include "TracyFileHeader.hpp"
#include "TracyMmap.hpp"
#include "TracyYield.hpp"
#include "../common/tracy_lz4.hpp"
#include "../common/TracyForceInline.hpp"
#include "../zstd/zstd.h"
namespace tracy
{
struct NotTracyDump : public std::exception {};
struct FileReadError : public std::exception {};
class FileRead
{
public:
static FileRead* Open( const char* fn )
{
auto f = fopen( fn, "rb" );
return f ? new FileRead( f, fn ) : nullptr;
}
~FileRead()
{
m_exit.store( true, std::memory_order_relaxed );
m_decThread.join();
if( m_data ) munmap( m_data, m_dataSize );
if( m_stream ) LZ4_freeStreamDecode( m_stream );
if( m_streamZstd ) ZSTD_freeDStream( m_streamZstd );
}
tracy_force_inline void Read( void* ptr, size_t size )
{
if( size <= BufSize - m_offset )
{
ReadSmall( ptr, size );
}
else
{
ReadBig( ptr, size );
}
}
tracy_force_inline void Skip( size_t size )
{
if( size <= BufSize - m_offset )
{
m_offset += size;
}
else
{
SkipBig( size );
}
}
template<class T>
tracy_force_inline void Read( T& v )
{
if( sizeof( T ) < BufSize - m_offset )
{
memcpy( &v, m_buf + m_offset, sizeof( T ) );
m_offset += sizeof( T );
}
else
{
T tmp;
ReadBig( &tmp, sizeof( T ) );
memcpy( &v, &tmp, sizeof( T ) );
}
}
template<class T, class U>
tracy_force_inline void Read2( T& v0, U& v1 )
{
if( sizeof( T ) + sizeof( U ) < BufSize - m_offset )
{
memcpy( &v0, m_buf + m_offset, sizeof( T ) );
memcpy( &v1, m_buf + m_offset + sizeof( T ), sizeof( U ) );
m_offset += sizeof( T ) + sizeof( U );
}
else
{
char tmp[sizeof( T ) + sizeof( U )];
ReadBig( tmp, sizeof( T ) + sizeof( U ) );
memcpy( &v0, tmp, sizeof( T ) );
memcpy( &v1, tmp + sizeof( T ), sizeof( U ) );
}
}
template<class T, class U, class V>
tracy_force_inline void Read3( T& v0, U& v1, V& v2 )
{
if( sizeof( T ) + sizeof( U ) + sizeof( V ) < BufSize - m_offset )
{
memcpy( &v0, m_buf + m_offset, sizeof( T ) );
memcpy( &v1, m_buf + m_offset + sizeof( T ), sizeof( U ) );
memcpy( &v2, m_buf + m_offset + sizeof( T ) + sizeof( U ), sizeof( V ) );
m_offset += sizeof( T ) + sizeof( U ) + sizeof( V );
}
else
{
char tmp[sizeof( T ) + sizeof( U ) + sizeof( V )];
ReadBig( tmp, sizeof( T ) + sizeof( U ) + sizeof( V ) );
memcpy( &v0, tmp, sizeof( T ) );
memcpy( &v1, tmp + sizeof( T ), sizeof( U ) );
memcpy( &v2, tmp + sizeof( T ) + sizeof( U ), sizeof( V ) );
}
}
template<class T, class U, class V, class W>
tracy_force_inline void Read4( T& v0, U& v1, V& v2, W& v3 )
{
if( sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) < BufSize - m_offset )
{
memcpy( &v0, m_buf + m_offset, sizeof( T ) );
memcpy( &v1, m_buf + m_offset + sizeof( T ), sizeof( U ) );
memcpy( &v2, m_buf + m_offset + sizeof( T ) + sizeof( U ), sizeof( V ) );
memcpy( &v3, m_buf + m_offset + sizeof( T ) + sizeof( U ) + sizeof( V ), sizeof( W ) );
m_offset += sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W );
}
else
{
char tmp[sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W )];
ReadBig( tmp, sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) );
memcpy( &v0, tmp, sizeof( T ) );
memcpy( &v1, tmp + sizeof( T ), sizeof( U ) );
memcpy( &v2, tmp + sizeof( T ) + sizeof( U ), sizeof( V ) );
memcpy( &v3, tmp + sizeof( T ) + sizeof( U ) + sizeof( V ), sizeof( W ) );
}
}
template<class T, class U, class V, class W, class X>
tracy_force_inline void Read5( T& v0, U& v1, V& v2, W& v3, X& v4 )
{
if( sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ) < BufSize - m_offset )
{
memcpy( &v0, m_buf + m_offset, sizeof( T ) );
memcpy( &v1, m_buf + m_offset + sizeof( T ), sizeof( U ) );
memcpy( &v2, m_buf + m_offset + sizeof( T ) + sizeof( U ), sizeof( V ) );
memcpy( &v3, m_buf + m_offset + sizeof( T ) + sizeof( U ) + sizeof( V ), sizeof( W ) );
memcpy( &v4, m_buf + m_offset + sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ), sizeof( X ) );
m_offset += sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X );
}
else
{
char tmp[sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X )];
ReadBig( tmp, sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ) );
memcpy( &v0, tmp, sizeof( T ) );
memcpy( &v1, tmp + sizeof( T ), sizeof( U ) );
memcpy( &v2, tmp + sizeof( T ) + sizeof( U ), sizeof( V ) );
memcpy( &v3, tmp + sizeof( T ) + sizeof( U ) + sizeof( V ), sizeof( W ) );
memcpy( &v4, tmp + sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ), sizeof( X ) );
}
}
template<class T, class U, class V, class W, class X, class Y>
tracy_force_inline void Read6( T& v0, U& v1, V& v2, W& v3, X& v4, Y& v5 )
{
if( sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ) + sizeof( Y ) < BufSize - m_offset )
{
memcpy( &v0, m_buf + m_offset, sizeof( T ) );
memcpy( &v1, m_buf + m_offset + sizeof( T ), sizeof( U ) );
memcpy( &v2, m_buf + m_offset + sizeof( T ) + sizeof( U ), sizeof( V ) );
memcpy( &v3, m_buf + m_offset + sizeof( T ) + sizeof( U ) + sizeof( V ), sizeof( W ) );
memcpy( &v4, m_buf + m_offset + sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ), sizeof( X ) );
memcpy( &v5, m_buf + m_offset + sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ), sizeof( Y ) );
m_offset += sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ) + sizeof( Y );
}
else
{
char tmp[sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ) + sizeof( Y )];
ReadBig( tmp, sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ) + sizeof( Y ) );
memcpy( &v0, tmp, sizeof( T ) );
memcpy( &v1, tmp + sizeof( T ), sizeof( U ) );
memcpy( &v2, tmp + sizeof( T ) + sizeof( U ), sizeof( V ) );
memcpy( &v3, tmp + sizeof( T ) + sizeof( U ) + sizeof( V ), sizeof( W ) );
memcpy( &v4, tmp + sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ), sizeof( X ) );
memcpy( &v5, tmp + sizeof( T ) + sizeof( U ) + sizeof( V ) + sizeof( W ) + sizeof( X ), sizeof( Y ) );
}
}
const std::string& GetFilename() const { return m_filename; }
private:
FileRead( FILE* f, const char* fn )
: m_stream( nullptr )
, m_streamZstd( nullptr )
, m_data( nullptr )
, m_buf( m_bufData[1] )
, m_second( m_bufData[0] )
, m_offset( 0 )
, m_lastBlock( 0 )
, m_signalSwitch( false )
, m_signalAvailable( false )
, m_exit( false )
, m_filename( fn )
{
char hdr[4];
if( fread( hdr, 1, sizeof( hdr ), f ) != sizeof( hdr ) )
{
fclose( f );
throw NotTracyDump();
}
if( memcmp( hdr, Lz4Header, sizeof( hdr ) ) == 0 )
{
m_stream = LZ4_createStreamDecode();
}
else if( memcmp( hdr, ZstdHeader, sizeof( hdr ) ) == 0 )
{
m_streamZstd = ZSTD_createDStream();
}
else
{
fclose( f );
throw NotTracyDump();
}
struct stat64 buf;
if( stat64( fn, &buf ) == 0 )
{
m_dataSize = buf.st_size;
}
else
{
fclose( f );
throw FileReadError();
}
m_data = (char*)mmap( nullptr, m_dataSize, PROT_READ, MAP_SHARED, fileno( f ), 0 );
fclose( f );
if( !m_data )
{
throw FileReadError();
}
m_dataOffset = sizeof( hdr );
ReadBlock();
std::swap( m_buf, m_second );
m_decThread = std::thread( [this] { Worker(); } );
}
void Worker()
{
for(;;)
{
ReadBlock();
for(;;)
{
if( m_exit.load( std::memory_order_relaxed ) == true ) return;
if( m_signalSwitch.load( std::memory_order_relaxed ) == true ) break;
YieldThread();
}
m_signalSwitch.store( false, std::memory_order_relaxed );
std::swap( m_buf, m_second );
m_offset = 0;
m_signalAvailable.store( true, std::memory_order_release );
if( m_lastBlock != BufSize ) return;
}
}
tracy_force_inline void ReadSmall( void* ptr, size_t size )
{
memcpy( ptr, m_buf + m_offset, size );
m_offset += size;
}
void ReadBig( void* ptr, size_t size )
{
auto dst = (char*)ptr;
while( size > 0 )
{
if( m_offset == BufSize )
{
m_signalSwitch.store( true, std::memory_order_relaxed );
while( m_signalAvailable.load( std::memory_order_acquire ) == false ) { YieldThread(); }
m_signalAvailable.store( false, std::memory_order_relaxed );
}
const auto sz = std::min( size, BufSize - m_offset );
memcpy( dst, m_buf + m_offset, sz );
m_offset += sz;
dst += sz;
size -= sz;
}
}
void SkipBig( size_t size )
{
while( size > 0 )
{
if( m_offset == BufSize )
{
m_signalSwitch.store( true, std::memory_order_relaxed );
while( m_signalAvailable.load( std::memory_order_acquire ) == false ) { YieldThread(); }
m_signalAvailable.store( false, std::memory_order_relaxed );
}
const auto sz = std::min( size, BufSize - m_offset );
m_offset += sz;
size -= sz;
}
}
void ReadBlock()
{
if( m_dataOffset < m_dataSize )
{
uint32_t sz;
memcpy( &sz, m_data + m_dataOffset, sizeof( sz ) );
m_dataOffset += sizeof( sz );
if( m_stream )
{
m_lastBlock = (size_t)LZ4_decompress_safe_continue( m_stream, m_data + m_dataOffset, m_second, sz, BufSize );
m_dataOffset += sz;
}
else
{
ZSTD_outBuffer out = { m_second, BufSize, 0 };
ZSTD_inBuffer in = { m_data + m_dataOffset, sz, 0 };
m_dataOffset += sz;
const auto ret = ZSTD_decompressStream( m_streamZstd, &out, &in );
assert( ret > 0 );
m_lastBlock = out.pos;
}
}
else
{
m_lastBlock = 0;
}
}
enum { BufSize = 64 * 1024 };
enum { LZ4Size = std::max( LZ4_COMPRESSBOUND( BufSize ), ZSTD_COMPRESSBOUND( BufSize ) ) };
LZ4_streamDecode_t* m_stream;
ZSTD_DStream* m_streamZstd;
char* m_data;
uint64_t m_dataSize;
uint64_t m_dataOffset;
char* m_buf;
char* m_second;
size_t m_offset;
size_t m_lastBlock;
alignas(64) std::atomic<bool> m_signalSwitch;
alignas(64) std::atomic<bool> m_signalAvailable;
alignas(64) std::atomic<bool> m_exit;
std::thread m_decThread;
std::string m_filename;
char m_bufData[2][BufSize];
};
}
#endif
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