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Disclosed is a method for guaranteed resources for incoming transactions from a scalable node/switch by aborting its unused speculative memory read transactions. Benefits include improved performance.
English (United States)
This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
81% of the total text.
Method for guaranteed resources for incoming transactions
from a scalable node/switch by aborting its unused speculative memory read
Disclosed is a method for guaranteed resources for incoming
transactions from a scalable node/switch by aborting its unused speculative
memory read transactions. Benefits include improved
� � � � � � The speculative read is a performance
enhancement that can be discarded without affecting computational accuracy.
A confirmation or cancel may be
sent later to terminate the speculative read, but the protocol does not
guarantee that every speculative read is terminated over time. Unterminated
speculative reads can accumulate, consuming resources. No function exists to
determine at the memory controller if a particular speculative read will be
confirmed or cancelled. Performance suffers if confirmed speculative reads are
discarded in favor of speculative reads that will never be cancelled.
� � � � � The resources
consumed by speculative reads are shared with other inbound transactions. Each
resource is assigned an index.
� � � � � The disclosed method is a simple mechanism that discards older
unterminated speculative reads and releases their resources.
� � � � � In a distributed
shared memory system (see Figure 1), multiple memory node controllers (each
controlling their own memory) are connected directly (see Figure 2) or through
a switch (see Figure 3). To reduce the latency of accessing remote me...