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In computing, unique set size (USS) is the portion of main memory occupied by a process which is guaranteed to be private to that process. The unshared memory of a process is reported as USS. [1] This concept is used for software running under the Linux operating system. [2]
cgroups (abbreviated from control groups) is a Linux kernel feature that limits, accounts for, and isolates the resource usage (CPU, memory, disk I/O, etc. [1]) of a collection of processes. Engineers at Google started the work on this feature in 2006 under the name "process containers". [2]
Process A has 50 KiB of unshared memory; Process B has 300 KiB of unshared memory; Both process A and process B have 100 KiB of the same shared memory region; Since the PSS is defined as the sum of the unshared memory of a process and the proportion of memory shared with other processes, the PSS for these two processes are as follows:
A separate user mode can also be used to build efficient virtual machines – see Popek and Goldberg virtualization requirements. With enough privileges, processes can request the kernel to map part of another process's memory space to its own, as is the case for debuggers .
The "extra memory" can be used in the page cache to cache frequently used files and metadata, such as directory information, from secondary storage. If the processor and operating system support multiple virtual address spaces, the "extra memory" can be used to run more processes.
Apache Ignite is an in-memory computing platform that is durable, strongly consistent, and highly available with powerful SQL, key-value and processing APIs. With full SQL support, one of the main use cases for Apache Ignite is the in-memory database which scales horizontally and provides ACID transactions. ArangoDB: ArangoDB GmbH 2011
In computing, resident set size (RSS) is the portion of memory (measured in kilobytes) occupied by a process that is held in main memory ().The rest of the occupied memory exists in the swap space or file system, either because some parts of the occupied memory were paged out, or because some parts of the executable were never loaded.
SLUB (the unqueued slab allocator [1]) is a memory management mechanism intended for the efficient memory allocation of kernel objects which displays the desirable property of eliminating fragmentation caused by allocations and deallocations. The technique is used to retain allocated memory that contains a data object of a certain type for ...