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macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

developer.apple.com

11–20 of 304 posts

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#11
post #9

It would be incredibly ironic if, with Apple's relatively stable supply chain relative to the chaos of the RAM market these days (projected to last for years), Apple compute became known as a cost-effective way to build medium-sized clusters for inference.

It’s gonna suck if all the good Macs get gobbled up by commercial users.

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#12
post #6

Can we get proper HDR support first in macOS? If I enable HDR on my LG OLED monitor it looks completely washed out and blacks are grey. Windows 11 HDR works fine.

Really? I thought it's always been that HDR was notorious on Windows, hopeless on Linux, and only really worked in a plug-and-play manner on Mac, unless your display has an incorrect profile or something/ https://www.youtube.com/shorts/sx9TUNv80RE

Works well on Linux, just toggle a checkmark in the settings.

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#13
post #6

Can we get proper HDR support first in macOS? If I enable HDR on my LG OLED monitor it looks completely washed out and blacks are grey. Windows 11 HDR works fine.

Really? I thought it's always been that HDR was notorious on Windows, hopeless on Linux, and only really worked in a plug-and-play manner on Mac, unless your display has an incorrect profile or something/ https://www.youtube.com/shorts/sx9TUNv80RE

MacOS does wash out SDR content in HDR mode specifically on non-Apple monitors. An HDR video playing in windowed mode will look fine but all the UI around it has black and white levels very close to grey.

Edit: to be clear, macOS itself (Cocoa elements) is all SDR content and thus washed out.

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#14

Can we get proper HDR support first in macOS? If I enable HDR on my LG OLED monitor it looks completely washed out and blacks are grey. Windows 11 HDR works fine.

AI is arguably more important than whatever gaming gimmick you're talking about.

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#15
post #4

I imagine that M5 Ultra with Thunderbolt 5 could be a decent contender for building plug and play AI clusters. Not cheap, but neither is Nvidia.

nvidia is absolutely cheaper per flop

To acquire, maybe, but to power?

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#16
post #8

Now we need some hardware that is rackmount friendly, an OS that is not fidly as hell to manage in a data center or headless server and we are off to the races! And no, custom racks are not 'rackmount friendly'.

So, the Powerbook Duo Dock?

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#17
post #4

I imagine that M5 Ultra with Thunderbolt 5 could be a decent contender for building plug and play AI clusters. Not cheap, but neither is Nvidia.

at current memory prices today's cheap is yesterday's obscenely expensive - Apple's current RAM upgrade prices are cheap

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#18
post #13
post #6

Earlier quoted context omitted.

Really? I thought it's always been that HDR was notorious on Windows, hopeless on Linux, and only really worked in a plug-and-play manner on Mac, unless your display has an incorrect profile or something/ https://www.youtube.com/shorts/sx9TUNv80RE

MacOS does wash out SDR content in HDR mode specifically on non-Apple monitors. An HDR video playing in windowed mode will look fine but all the UI around it has black and white levels very close to grey. Edit: to be clear, macOS itself (Cocoa elements) is all SDR content and thus washed out.

That's intended behavior for monitor limited in peak brightness

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#19
post #7

Very cool. It requires a fully-connected mesh so the scaling limit here would seem to be 6 Mac Studio M3 Ultra, up to 3TB of unified memory to work with.

I'm sure someone will figure out how to make thunderbolt switch/router

Re: macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt

#20
post #4

I imagine that M5 Ultra with Thunderbolt 5 could be a decent contender for building plug and play AI clusters. Not cheap, but neither is Nvidia.

nvidia is absolutely cheaper per flop

FLOPS are not what matters here.
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