Dr. Ian Cutress explains CPU cache hierarchies and how IBM's Telum mainframe processor implements a massive, shared virtual L3 cache.
We've been told by AMD (and @Hardwareunboxed) that cache matters for gaming. So how about giving everyone more cache? Not just L3, but a stonkingly massive L2 cache as well. IBM has the technology, and IBM has a deal with Intel. Coming soon, perhaps?
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Caches are important
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Layout of video
PART 1: WHAT IS A CACHE
Private cache vs Shared Cache
Tradeoff: Space Limits
Tradeoff: Know Your Workload
Tradeoff: Latency vs Capacity
PART 2: IBM's MAGIC CACHE
IBM Z Mainframes
IBM z15
IBM z16, Telum
Where is the L3? It's virtual!
Where is the L4? It's virtual!
Latency vs Capacity redux
How it works: Magic
Benefits for Gaming, for Intel
Lana'i Cat Tax
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Why it's here
1 person recommends this
What people say. Recommended as an explanation of IBM's high-throughput mainframe cache architecture.
Moments people linked to
M
u/MattAlex99in r/programming • Recommends
On “AWS Is Out To Kill Mainframes: "The cloud vendor wants to replace big iron with hyperscale servers, and COBOL – with Java"”
Mainframes are ridicoulus throughput monsters (see link to this video for IBMs new 2nm mainframe cache architecture).
The only question is whether you have a usecase for such high throughput systems if you aren't e.g. VISA or a big bank. But if you do need that, a mainframe is often the most economic method of getting things done.
