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FileStream & MapViewOfFile comparisonI need to access big data in a readonly fashion.
I was thinking to open a FileStream and seek and read as needed. I was wondering if it was worth doing my own FileStream class which would use internally use MapViewOfFile internally? Or pehaps a purely managed wrapper which, at least, load the bytes in 4k memory buffer (and update the buffer everytime I move)? Lloyd,
>I was wondering if it was worth doing my own FileStream class which would Have you seen the UnmanagedMemoryStream class in .NET 2.0? It may save>use internally use MapViewOfFile internally? you some work. There's also a file map helper class available here http://www.winterdom.com/dev/dotnet/index.html Mattias -- Mattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup. interesting link!
Show quote "Mattias Sjögren" <mattias.dont.want.spam@mvps.org> wrote in message news:eTWeQpGnGHA.4208@TK2MSFTNGP04.phx.gbl... > Lloyd, > >>I was wondering if it was worth doing my own FileStream class which would >>use internally use MapViewOfFile internally? > > Have you seen the UnmanagedMemoryStream class in .NET 2.0? It may save > you some work. > > There's also a file map helper class available here > http://www.winterdom.com/dev/dotnet/index.html > > > Mattias > > -- > Mattias Sjögren [C# MVP] mattias @ mvps.org > http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com > Please reply only to the newsgroup. "Lloyd Dupont" <net.galador@ld> wrote in message Most likely, no. The file system already does read-ahead buffering and news:u8jL1xFnGHA.3640@TK2MSFTNGP02.phx.gbl... >I need to access big data in a readonly fashion. > I was thinking to open a FileStream and seek and read as needed. > I was wondering if it was worth doing my own FileStream class which would > use internally use MapViewOfFile internally? generally will do a better job of managing the memory than you can do in your application. Unless your needs are very unusual, it's best to just use the OS-supplied file buffering - which FileStream will use since it's just a simple wrapper over the Win32 file I/O operations. -cd thanks!
Show quote "Carl Daniel [VC++ MVP]" <cpdaniel_remove_this_and_nospam@mvps.org.nospam> wrote in message news:OX$%23yQInGHA.4604@TK2MSFTNGP02.phx.gbl... > "Lloyd Dupont" <net.galador@ld> wrote in message > news:u8jL1xFnGHA.3640@TK2MSFTNGP02.phx.gbl... >>I need to access big data in a readonly fashion. >> I was thinking to open a FileStream and seek and read as needed. >> I was wondering if it was worth doing my own FileStream class which would >> use internally use MapViewOfFile internally? > > Most likely, no. The file system already does read-ahead buffering and > generally will do a better job of managing the memory than you can do in > your application. Unless your needs are very unusual, it's best to just > use the OS-supplied file buffering - which FileStream will use since it's > just a simple wrapper over the Win32 file I/O operations. > > -cd > > > >  |
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