3 ms·

From the Twitter thread: > The performance drop on a system with PCID is minimal. Most Macs have PCID. https://twitter.com/aionescu/status/948613035861553152

• Matt3o12_ 9y ago
  Could you eleblrate what PCID is and which models (CPUs) Support that?
  • tadfisher 9y ago
    Process context identifiers, which are basically tags for regions of cache/TLB, allowing for fast context switching on multi-CPU systems. Introduced in Haswell I believe.
    • jorvi 9y ago
      Reading the Twitter responses PCID was introduced with Westmere and INVPCID with Haswell.