memory-mapped-files Questions
5
Solved
I'm trying to find out how to remap memory-mapped files on a Mac (when I want to expand the available space).
I see our friends in the Linux world have mremap but I can find no such function in t...
Plumose asked 19/8, 2010 at 11:34
3
I have a program which uses mmap() and shared memory to efficiently access a large database file. I would like to experiment with huge pages to see if it speeds things up.
I thought that a quick an...
Tillandsia asked 27/4, 2012 at 0:16
1
Using .NET (dotnet 5.0) on Linux, MemoryMappedFile.CreateFromFile() works (but does not support mapName), but CreateNew() and CreateOrOpen() and OpenExisting() throw System.PlatformNotSupportedExce...
Upend asked 21/2, 2021 at 23:40
1
Solved
I want to implement the fastest possible Inter-Process Communication (IPC) (least CPU bound) between 2 .NET Core (or even mono possible) applications on Linux (SBC).
I tried TPC (socket, loopbacks)...
Supportable asked 18/12, 2022 at 10:53
5
Solved
In some situations the MemoryMappedViewAccessor class just doesn't cut it for reading bytes efficiently; the best we get is the generic ReadArray<byte> which it the route for all structs and ...
Munn asked 31/10, 2011 at 15:55
3
Solved
I have a client/server app. The server component runs, uses WCF in a 'remoting' fashion (binary formatter, session objects).
If I start the server component and launch the client, the first task t...
Chavannes asked 19/10, 2011 at 20:58
5
Solved
I need to read (scan) a file sequentially and process its content.
File size can be anything from very small (some KB) to very large (some GB).
I tried two techniques using VC10/VS2010 on Windows ...
Distributive asked 20/10, 2010 at 16:17
6
Solved
I wish to implement IPC using Named Shared Memory.
To do this, one of the steps is getting a handle to a Mapping Memory Object, using CreateFileMapping().
I do it exactly as MSDN website reccom...
Paralysis asked 22/10, 2010 at 17:0
3
Solved
I saved a couple of numpy arrays with np.save(), and put together they're quite huge.
Is it possible to load them all as memory-mapped files, and then concatenate and slice through all of them wit...
Kremer asked 8/12, 2012 at 19:11
1
Solved
as you can see in the code below, I'm having troubles adding new rows to a Table saved in a memory mapped file.
I just want to write the file again with the new rows.
import pyarrow as pa
source =...
Vitovitoria asked 12/3, 2021 at 7:46
7
Solved
I need something similar to ReadToEnd or ReadAllBytes to read all of the contents of the MemoryMappedFile using the MappedViewAccessor if I don't know the size of it, how can I do it?
I have searc...
Discordancy asked 19/2, 2013 at 8:56
2
I'm trying to parse a binary file integer-wise in order to check whether the integer value fulfills a certain condition but the loop is very slow.
Furthermore, I found that memory-mapped files are ...
Shanta asked 20/12, 2020 at 10:24
1
Solved
I'm looking for, essentially, the ext4 equivalent of mremap().
I have a big mmap()'d file that I'm allocating arrays in, and the arrays need to grow. So I want to make the first array larger at its...
Onshore asked 8/12, 2020 at 19:41
2
I'm facing a new problem, that occured while coding my IPC for my app.
Before UWP I was able to use the directive using System.IO.MemoryMappedFiles; sucessfully. Now I can't use using System.IO.Me...
Oddfellow asked 21/9, 2015 at 8:34
12
Solved
I am mapping a file("sample.txt") to memory using FileChannel.map() and then closing the channel using fc.close(). After this when I write to the file using FileOutputStream, I am getting...
Zoology asked 4/6, 2010 at 9:47
6
Solved
What limits the size of a memory-mapped file? I know it can't be bigger than the largest continuous chunk of unallocated address space, and that there should be enough free disk space. But are ther...
Tartlet asked 7/4, 2009 at 16:1
3
Solved
In my application, there is one process which writes data to a file, and then, in response to receiving a request, will send (some) of that data via the network to the requesting process. The basis...
Bear asked 22/5, 2020 at 19:20
1
This question is not a duplicate of any of these existing questions:
How can I store an object File that only exists in memory as a file inside of my storage system? - This question is not about ...
Surgeon asked 9/5, 2020 at 3:16
1
Solved
I built an application that can also be ran as a service (using a -service) switch. This works perfectly with no issues when I'm running the service from a command prompt (I have something set up t...
Burden asked 30/1, 2020 at 0:38
3
Solved
I'm trying to implement custom allocator for storing memory mapped files in the std::vector. Files mapping performed by boost::iostreams::mapped_file
Allocator type for file memory mapping:
templ...
Beastings asked 23/7, 2014 at 2:59
3
Solved
This is the code I am using to test this:
#include <iostream>
#include <boost/interprocess/managed_mapped_file.hpp>
#include <boost/container/map.hpp>
#include <boost/interpro...
Instead asked 31/10, 2019 at 16:5
3
Solved
Is it possible to use a structure with a pointer to another structure inside a memory mapped file instead of storing the offset in some integral type and calculate the pointer?
e.g. given followin...
Kovach asked 12/6, 2014 at 10:8
2
We create a file for use as memorymappedfile.
we open with GENERIC_READ | GENERIC_WRITE
we use share with FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE
we use file attributes FILE_ATTRIBU...
Scroggins asked 13/4, 2015 at 21:33
0
We are trying to port the following code from .Net Framework to .Net Core. The code creates an in-memory memory mapped file that is accessible by applications running under different logged in acco...
Hadik asked 17/7, 2019 at 23:59
3
Solved
Is it possible to load a numpy.memmap without knowing the shape and still recover the shape of the data?
data = np.arange(12, dtype='float32')
data.resize((3,4))
fp = np.memmap(filename, dtype='fl...
Seaboard asked 20/4, 2016 at 15:51
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