4 ms·
The Knights Corner (2012-2015) Xeon Phi was based on a modified and scaled down version of the Intel P54C core... the same one used in the original 1995 Pentium
by trsohmers 11y ago
The Knights Corner (2012-2015) Xeon Phi was based on a modified and scaled down version of the Intel P54C core... the same one used in the original 1995 Pentium. On top of that, each core only runs at 1.053 to 1.1GHz. Why would you think that single threaded performance would be any good for an in order superscalar core that is 20 years old?
- rbanffy 11y agoIIRC, it's actually a bit worse: each core could run two threads, but they'd run alternating clock cycles, like the Cell PPUs - unless you have two threads running, each core has half that speed. A normal optimization trick of spreading across as many cores as possible backfires here. But that was integer performance. Each core also had a beefy SIMD unit, twice as wide as the one in then current Xeons.