Memory Mapped Files .NET
I know this is a bit late, but the .NET 4.0 framework now supports memory-mapped files out of the box: http://blogs.msdn.com/salvapatuel/archive/2009/06/08/working-with-memory-mapped-files-in-net-4.aspx
memory-mapped-files
Using boost::iostreams::mapped_file_source with std::multimap
Multi maps aren’t laid out sequentially in memory. (They’re node-based containers, but I digress). In fact, even if they were, chances would be slim that the layout would match that of the text input. There’s basically two ways you can make this work: Keep using the multimap but use a custom allocator (so that all … Read more
Inno Setup Get progress from .NET Framework 4.5 (or higher) installer to update progress bar position
The following shows Pascal Script implementation of the code from How to: Get Progress from the .NET Framework 4.5 Installer [Files] Source: “NDP462-KB3151800-x86-x64-AllOS-ENU.exe”; Flags: dontcopy [Code] // Change to unique names const SectionName=”MyProgSetup”; EventName=”MyProgSetupEvent”; const INFINITE = 65535; WAIT_OBJECT_0 = 0; WAIT_TIMEOUT = $00000102; FILE_MAP_WRITE = $0002; E_PENDING = $8000000A; S_OK = 0; MMIO_V45 = … Read more
How big can a memory-mapped file be?
You’re being too conservative: A memory-mapped file can be larger than the address space. The view of the memory-mapped file is limited by OS memory constraints, but that’s only the part of the file you’re looking at at one time. (And I guess technically you could map multiple views of discontinuous parts of the file … Read more
How does mmap improve file reading speed?
mmap works differently. It is anticipatory and adapts to the program’s access pattern. Also, specific policies can be set via madvise to further fine tune usage. For a much more thorough discussion of how mmap works in a demand paging environment, see my answer here: Which segments are affected by a copy-on-write? as it also … Read more
How to unmap a file from memory mapped using FileChannel in java?
Following static method could be used: public static void unmap(MappedByteBuffer buffer) { sun.misc.Cleaner cleaner = ((DirectBuffer) buffer).cleaner(); cleaner.clean(); } But this is unsafe solution because of following: 1) Lead to failures if someone use MappedByteBuffer after unmap 2) It relies on MappedByteBuffer implementation details