Cray T3E Cache Structure
Each CRAY T3E processor contains an 8 KB direct-mapped primary data cache (Dcache), an 8 KB instruction cache, and a 96 KB 3-way associative secondary cache (Scache) which is used for both data and instructions.
The Scache has a random replacement policy and is write-allocate and write-back, meaning that a cacheable store request to an address that is not in the cache causes that address to be loaded into the Scache, then modified and tagged as dirty for write-back later.
Write-back of dirty cache lines occurs only when the line is removed from the Scache, either by the Scache controller to make room for a new cache line, or by the back-map to maintain coherence of the caches with the local memory and/or registers.