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Nov 3, 2008 · 377 mmap is great if you have multiple processes accessing data in a read only fashion from the same file, which is common in the kind of server systems I write. mmap allows all those processes to share ...
Jun 12, 2018 · mmap works by manipulating your process's page table, a data structure your CPU uses to map address spaces. The CPU will translate "virtual" addresses to "physical" ones, and does so according to the pa...
Sep 5, 2008 · The mmap() code could potentially get very messy since mmap 'd blocks need to lie on page sized boundaries (my understanding) and records could potentially lie across page boundaries. With fstream s, I c...
Feb 13, 2024 · When allocating blocks of memory larger than MMAP_THRESHOLD bytes, the glibc malloc() implementation allocates the memory as a private anonymous mapping using mmap(2). So if malloc in many cases in impl...
Jan 11, 2019 · In this thread the OP is suggested to use mmap() instead of shmget() to get shared memory in Linux. I visited this page and this page to get some documentation, but the second one gives an obscure examp...
Aug 30, 2017 · I was going through documentation regarding mmap here and tried to implement it using this video. I have a few questions regarding its implementation. Does mmap provide a mapping of a file and ret...
Aug 23, 2012 · mmap can be used for a few things. First, a file-backed mapping. Instead of allocating memory with malloc and reading the file, you map the whole file into memory without explicitly reading it. Now when...
Sep 4, 2010 · man mmap will help you here. It creates a memory mapping in the virtual address space of the process. It's creating an anonymous mapping, which is rather like using malloc to allocate n bytes of memory. ...
May 26, 2012 · Not sure if this helps but as far as I know, Perf subsystem in the kernel provides a set of pages from the kernel memory (a ring buffer, actually) that can be mmap'ed by user-space applications. Its imp...
Oct 12, 2018 · Using mmap() maps the file to process' address space, so the process can address the file directly and no copies are required. There is also no system call overhead when accessing memory mapped file aft...
