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JBis
JBis
5:32 PM
Just had long chat with Apple and did some of my own testing. It is related to memory. If I drive up memory pressure I get popping sound. They want to do repair.
> Well I'll be completely straight with you haha
This is an issue that engineering is already aware of and if reinstalling macOS doesn't help, then it's immediately service
 
bmike
bmike
Wow - that’s surprising and hopeful and I would trust them. Apple engineers are amazingly good and when they sniff a defect they want those parts back to confirm and fix
 
JBis
JBis
I just don't want to waste time getting a repair if it is purely a software issue. But I understand.
 
bmike
bmike
Did they have you use sudo memory_pressure -l warn or send it critical to trigger the distortion?
you are right, too. Swapping the board for one also potentially needing hardware correction would be a waste short term of your time
55
A: What scale or measure does Mavericks' and Yosemite's "memory pressure" adhere to?

bmikeMemory pressure isn't a simple gauge of percentage of memory free and seems to be a 0 to 100% graph. The sysctl value of vm.memory_pressure is calculated in relation to a computed target that tracks the ratio between free and inactive memory pages to the wired and active pages. The absolute count...

 
JBis
JBis
@bmike I used a third party tool linux.die.net/man/8/memtester (installed with Homebrew) + firefox 100x tabs to stress memory. Wasn't aware of that tool
just tested memory_pressure, doesn't seem to work. It got to 60 GB of allocated memory and activity monitor was still in mid yellow
 
 
1 hour later…
bmike
bmike
6:45 PM
Level warn is yellow, you have to pass crit to the command to go in the red. Thanks for the link - bookmarking!
memory_pressure -l critical
 

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