Thank you for buying via links and ads on this site,
which earn me advertising fees or commissions.
As an Amazon Associate I earn from qualifying purchases.

Other World Computing...
B&H Photo...
Amazon
As an Amazon Associate I earn from qualifying purchases.
Upgrade the memory of your 2018 Mac mini up to 64GB
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$1100 $880
SAVE $220

$999 $779
SAVE $220

$1299 $949
SAVE $350

$799 $549
SAVE $250

$1499 $999
SAVE $500

$799 $549
SAVE $250

$2797 $2497
SAVE $300

$1997 $1797
SAVE $200

$549 $499
SAVE $50

$1699 $949
SAVE $750

$240 $175
SAVE $65

$3399 $2699
SAVE $700

Monitoring System Activity on the Command Line

Monitoring performance in Terminal can be useful for diagnosing performance issues, using the top and vm_stat tools (and iostat for disk I/O).

These tools are used in a Terminal window. The most useful tool is top, which can be left running continually, refreshing the window at regular intervals.

top

Show top 10 processes by CPU usage every 2 seconds, with data collected every 5 seconds:

top -o cpu -s 2 -i 5
Show top 10 processes by real memory every 2 seconds:

top -o rsize -s 2

'top' display by CPU usage

vm_stat

The vm_stat tool also provides some useful statistics on the use of real memory, compressed memory and virtual memory.

'vm_stat' output

iostat

The iostat tool also provides statistics on disk I/O.

Show up to 16 drives every 2 seconds:

iostat -w 2 -n 16

iostat output at 2-second intervals

Deals Updated Daily at B&H Photo
View all handpicked deals...

Apple 13.3" MacBook Air with Retina Display (Early 2020, Gold)
$999 $779
SAVE $220

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__