[SOLVED] how to get average memory usage, like sar
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Are you sure? Did you really go through sar manual??
As per manual:-
System load average for the past 5 minutes.
System load average for the past 15 minutes.
-r Report memory utilization statistics. The following values are displayed:
Amount of free memory available in kilobytes.
Amount of used memory in kilobytes. This does not take into account memory used by the kernel itself.
Percentage of used memory.
Amount of memory used as buffers by the kernel in kilobytes.
Amount of memory used to cache data by the kernel in kilobytes.
Amount of memory in kilobytes needed for current workload. This is an estimate of how much RAM/swap is needed to guarantee that there never is out of memory.
Percentage of memory needed for current workload in relation to the total amount of memory (RAM+swap). This number may be greater than 100% because the kernel usually overcommits memory.
Report memory statistics. The following values are displayed:
Number of memory pages freed by the system per second. A negative value represents a number of pages allocated by the system. Note that a page has a size of 4 kB or 8 kB according to the machine architecture.
Number of additional memory pages used as buffers by the system per second. A negative value means fewer pages used as buffers by the system.
Number of additional memory pages cached by the system per second. A negative value means fewer pages in the cache.
And memory usage in what sense - can you explain your requirement little more? Memory usage (which memory, physical, swap, virtual?) by any process at some point of time or avg. for whole day or load average for whole day or what...? Explain.