GNU Info

(time.info)Memory Resources

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Memory Resources
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`M'
     Maximum resident set size of the process during its lifetime, in
     Kilobytes.

`t'
     Average resident set size of the process, in Kilobytes.

`K'
     Average total (data+stack+text) memory use of the process, in
     Kilobytes.

`D'
     Average size of the process's unshared data area, in Kilobytes.

`p'
     Average size of the process's unshared stack, in Kilobytes.

`X'
     Average size of the process's shared text, in Kilobytes.

`Z'
     System's page size, in bytes.  This is a per-system constant, but
     varies between systems.