What is Store buffer?
A small buffer in which a core holds writes temporarily. The core can move on without waiting for writes to complete, but other cores see the writes later.
Field: Multicore & Synchronization
Store buffer in the explanations
For performance, CPUs may reorder memory operations, for example by holding writes in a store buffer or performing reads early.
What does a memory consistency model define?On real CPUs, however, x = 1 first enters the core's store buffer, and before it becomes visible to other cores the later read r1 = y can fetch its value from cache or memory.
The two threads above run simultaneously on different cores…This model directly reflects the presence of a store buffer.
What is a characteristic of the x86 memory consistency mode…
Questions that mention Store buffer (3)
- What does a memory consistency model define?
- The two threads above run simultaneously on different cores (assume no compiler reordering). Which outcome cannot occur under sequential consistency but can occur on real CPUs such as x86?
- What is a characteristic of the x86 memory consistency model (TSO, total store order)?
Related terms
Memory consistency model Sequential consistency Memory barrier Total store order (TSO) ABA problem Acquire-release semantics Atomic instruction Barrier synchronization Bus snooping Compare-and-swap