06-25-2012
from the Sample attached you are using computational (for real work) approx 29 GB of your memory - you have about 44 GB. Anything above the computational memory up to 97% may be needed for caching and buffering.
I am with Bakunin, you might have an IO issue as your number of blocked IOs is pretty high. Maybe you do not have enough filesystem buffers, maybe your runqueues on the disks are too low.
Regards
zxmaus
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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