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What is maximum resident set size in linux?
1 Answer. A process’s resident set size is the amount of memory that belongs to it and is currently present (resident) in RAM (real RAM, not swapped or otherwise not-resident).
What is resident set size linux?
In computing, resident set size (RSS) is the portion of memory occupied by a process that is held in main memory (RAM). 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.
What is Vsize in Linux?
VSIZE (Virtual memory SIZE) – The amount of memory the process is currently using. This includes the amount in RAM and the amount in swap. RSS (Resident Set Size) – The portion of a process that exists in physical memory (RAM). If the computer has not used swap, this number will be equal to VSIZE.
What is the maximum resident set size for RUSAGE?
ru_maxrss (since Linux 2.6.32) This is the maximum resident set size used (in kilobytes). For RUSAGE_CHILDREN, this is the resident set size of the largest child, not the maximum resident set size of the process tree.
What happens to the resident set size in getrusage?
If after the process then stops using (but doesn’t release) that memory for a while, the OS could opt to swap chunks of that memory to swap, to make room for other processes (or cache). The resident set size would then decrease by the amount the kernel swapped out.
What does maximum resident set size ( RSS ) mean?
Resident set size (RSS) means, roughly, the total amount of physical memory assigned to a process at a given point in time. It does not count pages that have been swapped out, or that are mapped from a file but not currently loaded into physical memory.
What does integral mean in getrusage-man pages?
An “integral” value indicating the amount of memory in use by a process while the process is running. This value is the sum of the resident set sizes of the process running when a clock tick occurs. The value is given in pages times clock ticks. It does not take sharing into account. See the NOTES section of this page.