Working out percentage of memory utilization Post: 303001633

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Top Forums Shell Programming and Scripting Working out percentage of memory utilization Post 303001633 by RudiC on Tuesday 8th of August 2017 08:41:05 AM

08-08-2017

Registered User

In principle, yes. However, inside the ((...)) ("arithmetic expansion") you don't need the $ , see e.g. man bash.

But, you have picked the perfect line to illustrate what I was talking about:
To produce a value to be assigned to mem_utalization, you use (the deprecated `...` version of) "command substitution" which is the standard output of the command. Your command is a variable assignment (sum=...). What is the stdout of a variable assignment? Nothing! So, mem_utalization is empty.
The next one is $mem_total/($mem_total - $mem_available) which will result in a value above 100% given all values used are positive. Is that what you want?

In your above script you're running free, grep, and awk umpteen times, each causing a (costly) process creation - why not do it all in a single pass? Try

Code:

free | awk '/^Mem/ {print "Total:", $2, ", free:", $4, ", used:", $3, ", something:", ($2-$7)/$2*100, "%"}' OFMT="%.2f"
Total: 1918976 , free: 100452 , used: 955060 , something: 63.88 %

without assessing your interpretation of free's numbers / columns. You can even have the distinction between various linux versions done in that one small awk script ...

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memory_pressure

MEMORY_PRESSURE(1)					    BSD General Commands Manual 					MEMORY_PRESSURE(1)

NAME

     memory_pressure -- Tool to apply real or simulate memory pressure on the system.

SYNOPSIS

     memory_pressure [-l level] | [-p percent_free] | [-S -l level]

OPTIONS

     -l <level> Apply real or simulate memory pressure (if specified alongside simulate argument) on the system till low memory notifications cor-
     responding to <level> are generated. Supported values are "warn" and "critical".

     -p <percent_free> Allocate memory till the available memory in the system is <percent_free> of total memory. If the percentage of available
     memory to total memory on the system drops, the tool will free memory till either the desired percentage is achieved or it runs out of memory
     to free.

     -S Simulate memory pressure on the system by placing it artificially for <sleep_seconds> duration at the "warn" or "critical" level.

     -s <sleep_seconds> Duration to wait before allocating or freeing memory if applying real pressure. In case of simulating memory pressure,
     this is the duration the system will be maintained at an artifical memory level.

DESCRIPTION

     A tool to apply real or simulate memory pressure on the system

SEE ALSO

     vm_stat(1)

Mac OS X							    Mar 7, 2013 							  Mac OS X