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- Memory Mapped File Windows 11
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Setting memory mapped file limit for Windows? Ask Question Asked 4 years, 3 months ago. Is it possible to tell Windows cache upto 90GB of mapped files and leave 5GB open? Windows-server-2008 elasticsearch. Windows 2008 Server R2, memory full but process total nowhere near? Nov 14, 2016 Hi, we have a file server with win2k12 r2, today am facing with memory issue. I used ram map tool to identify the high usage as mapped file, how to fix this issue. Hi Dhamodaran, i used ram map tool to identify the high usage as mapped file, how to fix this issue. Please open task manager, and then click Memory on Process panel, you could. The following C# sample shows how to create a memory mapped file and use private namespaces to allow access to specific groups of users: FORM1.CS. Using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms. The classes mappedfilesource, mappedfilesink and mappedfile provide access to memory-mapped files on Windows and POSIX systems. These Devices behave much like the File Wrappers basicfilesource, basicfilesink and basicfile, with the following important differences. Memory mapping of files is a very powerful abstraction that many operating systems support out of the box. Linux does this via the mmap system call.
I need to transfer some data -
char buffer[100000];
- to a child process which is started by me.Mapped files are files in the file system which have been mapped into RAM while a user has the file open. The big user of RAM is something called Metafile. This is typically not a big user of memory on a server or workstation.
Right now I'm using an ordinary file to do so, the parent process writes the data to a file on disk, and the child process reads it from disk and deletes the file. However, that causes unnecessary writes to the disk, so I want to use memory-mapped files instead.
Memory Mapped File Windows 11
How do I create, write to, and then read from a memory-mapped file in such a way that no data is written to disk, except when the pagefile or swap file is used?
Edit: I forgot to specify that I want to use raw WINAPI functions, so the code doesn't have dependencies. I am researching on how to do it and will post an answer myself when ready, but if someone has ready-made code, they're welcome to save me some effort :)
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3 Answers
Pass
INVALID_HANDLE_VALUE
as the file handle when calling CreateFileMapping
:If hFile is INVALID_HANDLE_VALUE, the calling process must also specify a size for the file mapping object in the dwMaximumSizeHigh and dwMaximumSizeLow parameters. In this scenario, CreateFileMapping creates a file mapping object of a specified size that is backed by the system paging file instead of by a file in the file system.
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You can use either an anonymous file mapping object (pass inheritable handle to child process), or use a named file mapping.
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You can use an anonymous file mapping (David Heffernan's answer goes into more detail on this step) with handle inheritance / handle duplication. For example, pass the HANDLE from the parent process on the command-line, then in the child use
DuplicateHandle
to get a valid HANDLE in the child.The CreateFileMapping documentation says that
Multiple processes can share a view of the same file by either using a single shared file mapping object or creating separate file mapping objects backed by the same file. A single file mapping object can be shared by multiple processes through inheriting the handle at process creation, duplicating the handle, or opening the file mapping object by name. For more information, see the CreateProcess, DuplicateHandle and OpenFileMapping functions.
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But it may be easier just to use a ramdisk.
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I just found an excellent MSDN article on how to do it, complete with sample code, which I've pasted below.
First process (sends the data):
Second process (receives the data):
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