All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: diglloyd.com photography and WindInMyFace.com
Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Upgrade the memory of your 2019 iMac up to 128GB
Handpicked deals...
$2499 $1399
SAVE $1100

$400 $280
SAVE $120

$1798 $1598
SAVE $200

$3297 $2797
SAVE $500

$3397 $2797
SAVE $600

$150 $90
SAVE $60

$1398 $898
SAVE $500

$3698 $2998
SAVE $700

$2998 $2498
SAVE $500

$1799 $1329
SAVE $470

$1999 $1199
SAVE $800

$2299 $1599
SAVE $700

$2399 $2049
SAVE $350

$2799 $2399
SAVE $400

$2799 $1899
SAVE $900

$1199 $920
SAVE $279

$997 $897
SAVE $100

$2099 $1699
SAVE $400

$1999 $1369
SAVE $630

$1999 $1599
SAVE $400

$1349 $949
SAVE $400

$4499 $3099
SAVE $1400

$4499 $3999
SAVE $500

$329 $329
SAVE $0

$1499 $1029
SAVE $470

$1499 $1289
SAVE $210

$2199 $1999
SAVE $200

$3399 $2199
SAVE $1200

4-Core CPUs do not Leave Much Grunt for Other Tasks: Cloning Can Use all Available CPUs in a 4-Core Mac

Recently I bought a 2017 iMac 5K for solid reasons and I discussed the switchover and the gear I’m using.

I am generally reluctant to use a 4-core machine, because my work often involves getting work done while other stuff happens, like clone backups—and cloning takes a lot of CPU power—see the rsync processes below. Still, the 4.2 GHz 2017 iMac 5K is really more like a 6-core 2013 Mac Pro, since the iMac’s cores all run at minimum of 4.2 GHz (4.5 GHz turbo boost).

On a 4-core machine, 400% usage is full utilization; virtual CPU cores accomplish nil and can even make some applications run slower if treated like real CPU cores.

When I return from a trip with 232GB of image files, I like to make 3 or 4 backups all at once to be sure it is all squirreled away, complete with IntegrityChecker hashes (already done, the CPUusage below is purely for the cloning activity).

Shown below, about 2.2 CPU cores are in use just for cloning, meaning that besides delays in I/O for other work, there are only about 1.8 CPU cores availabl for doing other stuff.

The foregoing is one reason among several that I might end up with an iMac Pro instead of the 2017 iMac 5K, but given the downclocking of the CPU cores in the iMac Pro, it’s not clear that excepting a few situations, 8 or 10 or 14 or 18 CPU cores might not run any faster, and at far greater expense. The question is on average, does the machine save the user enough time to make the saved time worth the extra cost. Or does it, perhaps, actually end up costing the user more time and more money? That is a distinct possibility for some workloads.

Cloning takes substantial CPU time, disadvantage of a 4-core CPU

CLICK TO VIEW: Configuring my 2017 iMac 5K and Various


Save the tax, we pay you back, instantly!
View all handpicked deals...

Samsung 2TB T5 Portable Solid-State Drive (Black)
$400 $280
SAVE $120

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__