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What is getrusage in c?
The getrusage() function provides measures of the resources used by the current process or its terminated and waited-for-child processes. If the value of the who argument is RUSAGE_SELF, information is returned about resources used by the current process.
What is getrusage?
getrusage() returns current resource usages, for a who of either RUSAGE_SELF or RUSAGE_CHILDREN. The former asks for resources used by the current process, the latter for resources used by those of its children that have terminated and have been waited for.
Is Getrusage a system call?
The getrusage system call retrieves process statistics from the kernel. It can be used to obtain statistics either for the current process by passing RUSAGE_SELF as the first argument, or for all terminated child processes that were forked by this process and its children by passing RUSAGE_CHILDREN.
What does Rusage mean?
resource usage section
rusage is a resource usage section defined as a string after -R flag in bsub. It is the resource usage section specifies the expected resource consumption of the task.
What does Getrusage return?
getrusage() returns resource usage measures for who, which can be one of the following: RUSAGE_SELF Return resource usage statistics for the calling process, which is the sum of resources used by all threads in the process.
What does Maxrss mean?
“maxrss = maximum amount of memory used at any time by any process in that job. This applies directly for serial jobs. For parallel jobs you need to multiply with the number of cores (max 16 or 24 as this is reported only for that node that used the most memory)”
What is Rusage in Linux?
DESCRIPTION top. getrusage() returns resource usage measures for who, which can be one of the following: RUSAGE_SELF Return resource usage statistics for the calling process, which is the sum of resources used by all threads in the process.
What is the difference between getrusage and get resources?
The former asks for resources used by the current process, the latter for resources used by those of its children that have terminated and have been waited for.
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.
What does the are _ usage argument do in getrusage?
The r_usage argument is a pointer to an object of type struct rusage in which the returned information is stored. The members of rusage are as follows: The structure members are interpreted as follows:
Why does getrusage ( 2 ) return zero on error?
The number of times a context switch resulted due to a higher priority process becoming runnable or because the current process exceeded its time slice. On success, zero is returned. On error, -1 is returned, and errno is set appropriately. usage points outside the accessible address space.