Applications can map data on SSDs into virtual memory to transparently scale beyond DRAM capacity, permitting them to leverage high SSD capacities with few code changes. Obtaining good performance for memory-mapped SSD content, however, is hard because the virtual memory layer, the file system and the flash translation layer (FTL) perform address translations, sanity and permission checks independently from each other. We introduce FlashMap, an SSD interface that is
optimized for memory-mapped SSD-files. FlashMap combines all the address translations into page tables that are used to index files and also to store the FTL-level mappings without altering the guarantees of the file system or the FTL. It uses the state in the OS memory manager and the page tables to perform sanity and permission checks respectively. By combining these layers, FlashMap reduces critical-path latency and improves DRAM caching efficiency. We find that this in-
creases performance for applications by up to 3.32x compared to state-of-the-art SSD file-mapping mechanisms. Additionally, latency of SSD accesses reduces by up to 53.2%.
optimized for memory-mapped SSD-files. FlashMap combines all the address translations into page tables that are used to index files and also to store the FTL-level mappings without altering the guarantees of the file system or the FTL. It uses the state in the OS memory manager and the page tables to perform sanity and permission checks respectively. By combining these layers, FlashMap reduces critical-path latency and improves DRAM caching efficiency. We find that this in-
creases performance for applications by up to 3.32x compared to state-of-the-art SSD file-mapping mechanisms. Additionally, latency of SSD accesses reduces by up to 53.2%.
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File Security Definition
Inter-process communication with Memory Mapped Files A library that allows inter-process communication using a shared Memory Mapped File, in which two or more processes can read and write byte arrays. It provides a method to write and an event that is raised every time new data are available. The memory mapped file security allows you to customize who or which process can have access to the resource, this can be quite important when you want to protect sensitive information and you don’t want other processes changing the file map. Fixes an issue that occurs when you run an application that uses the FlushViewOfFile function to clean up memory-mapped files from the paged memory pool. This issue occurs on a computer that is running Windows 7 or Windows Server 2008 R2.