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- c - When should I use mmap for file access? - Stack Overflow
375 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 the same physical memory pages, saving a lot of memory mmap also allows the operating system to optimize paging operations
- linux - How does mmap work? - Stack Overflow
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 page table set up by your kernel
- c++ - mmap () vs. reading blocks - Stack Overflow
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 can just seek to the start of a record and begin reading again, since we're not limited to reading blocks that lie on page sized boundaries
- Linux shared memory: shmget () vs mmap ()? - Stack Overflow
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
- c - When would you use mmap - Stack Overflow
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 you read from (or write to) that memory area, the operations act on the file, transparently Why would you want to do this? It lets you easily process files that are larger than the available
- memory - Understanding mmap - Unix Linux Stack Exchange
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
- c - What does mmap do? - Stack Overflow
13 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 The parameters are: NULL - the kernel will choose an address for the mapping n - length of the mapping (in bytes) PROT_WRITE - pages may be
- Process memory layout - difference between heap, data and mmap areas
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 implemented by mmap, what's the difference between the heap and and the mmap area?
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