Cache directory lookup reader set encoding for partial cache line speculation support

Gara, Alan; Ohmacht, Martin

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Title: Cache directory lookup reader set encoding for partial cache line speculation support

Abstract

In a multiprocessor system, with conflict checking implemented in a directory lookup of a shared cache memory, a reader set encoding permits dynamic recordation of read accesses. The reader set encoding includes an indication of a portion of a line read, for instance by indicating boundaries of read accesses. Different encodings may apply to different types of speculative execution.

Inventors:: Gara, Alan; Ohmacht, Martin

Issue Date:: 2014-10-21

Research Org.:: International Business Machines Corp., Armonk, NY (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1160334

Patent Number(s):: 8868837

Application Number:: 13/008,602

Assignee:: International Business Machines Corporation (Armonk, NY)

Patent Classifications (CPCs):: G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING

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G - PHYSICS G06 - COMPUTING G06F - ELECTRIC DIGITAL DATA PROCESSING
G06F12/08 - in hierarchically structured memory systems, e.g. virtual memory systems
G06F12/084 - with a shared cache
G06F12/0842 - for multiprocessing or multitasking
G06F9/524 - {Deadlock detection or avoidance}

Show less

DOE Contract Number:: B554331

Resource Type:: Patent

Resource Relation:: Patent File Date: 2011 Jan 18

Country of Publication:: United States

Language:: English

Subject:: 97 MATHEMATICS AND COMPUTING

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                    Gara, Alan, and Ohmacht, Martin. Cache directory lookup reader set encoding for partial cache line speculation support.  United States: N. p., 2014. 
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                    Gara, Alan, & Ohmacht, Martin. Cache directory lookup reader set encoding for partial cache line speculation support.  United States.

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                    Gara, Alan, and Ohmacht, Martin. Tue .  
        "Cache directory lookup reader set encoding for partial cache line speculation support".  United States.  https://www.osti.gov/servlets/purl/1160334.

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@article{osti_1160334,

  title        = {Cache directory lookup reader set encoding for partial cache line speculation support},

  author       = {Gara, Alan and Ohmacht, Martin},

  abstractNote = {In a multiprocessor system, with conflict checking implemented in a directory lookup of a shared cache memory, a reader set encoding permits dynamic recordation of read accesses. The reader set encoding includes an indication of a portion of a line read, for instance by indicating boundaries of read accesses. Different encodings may apply to different types of speculative execution.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2014},

  month        = {10}

}

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Reader set encoding for directory of shared cache memory in multiprocessor system

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In a parallel processing system with speculative execution, conflict checking occurs in a directory lookup of a cache memory that is shared by all processors. In each case, the same physical memory address will map to the same set of that cache, no matter which processor originated that access. The directory includes a dynamic reader set encoding, indicating what speculative threads have read a particular line. This reader set encoding is used in conflict checking. A bitset encoding is used to specify particular threads that have read the line.
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Cache directory look-up re-use as conflict check mechanism for speculative memory requests

Patent Ohmacht, Martin

In a cache memory, energy and other efficiencies can be realized by saving a result of a cache directory lookup for sequential accesses to a same memory address. Where the cache is a point of coherence for speculative execution in a multiprocessor system, with directory lookups serving as the point of conflict detection, such saving becomes particularly advantageous.
Full Text Available
Checkpointing in speculative versioning caches

Patent Eichenberger, Alexandre E; Gara, Alan; Gschwind, Michael K; ...

Mechanisms for generating checkpoints in a speculative versioning cache of a data processing system are provided. The mechanisms execute code within the data processing system, wherein the code accesses cache lines in the speculative versioning cache. The mechanisms further determine whether a first condition occurs indicating a need to generate a checkpoint in the speculative versioning cache. The checkpoint is a speculative cache line which is made non-speculative in response to a second condition occurring that requires a roll-back of changes to a cache line corresponding to the speculative cache line. The mechanisms also generate the checkpoint in the speculativemore » « less
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Evict on write, a management strategy for a prefetch unit and/or first level cache in a multiprocessor system with speculative execution

Patent Gara, Alan; Ohmacht, Martin

In a multiprocessor system with at least two levels of cache, a speculative thread may run on a core processor in parallel with other threads. When the thread seeks to do a write to main memory, this access is to be written through the first level cache to the second level cache. After the write though, the corresponding line is deleted from the first level cache and/or prefetch unit, so that any further accesses to the same location in main memory have to be retrieved from the second level cache. The second level cache keeps track of multiple versions ofmore » « less
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Version pressure feedback mechanisms for speculative versioning caches

Patent Eichenberger, Alexandre E.; Gara, Alan; O&#x27;Brien, Kathryn M.; ...

Mechanisms are provided for controlling version pressure on a speculative versioning cache. Raw version pressure data is collected based on one or more threads accessing cache lines of the speculative versioning cache. One or more statistical measures of version pressure are generated based on the collected raw version pressure data. A determination is made as to whether one or more modifications to an operation of a data processing system are to be performed based on the one or more statistical measures of version pressure, the one or more modifications affecting version pressure exerted on the speculative versioning cache. An operationmore » « less
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Title: Cache directory lookup reader set encoding for partial cache line speculation support

Abstract

Citation Formats

Odd boundary address aligned direct memory acess device and method patent, December 1992

Processor associated blocking symbol controls for serializing the accessing of data resources in a computer system patent, April 1999

Eviction override for larx-reserved addresses patent, April 2001

Apparatus and method for preventing cache data eviction during an atomic operation patent, February 2002

System and method providing cache coherency and atomic memory operations in a multiprocessor computer architecture patent, March 2002

Detecting full conditions in a queue patent, October 2002

Information processing apparatus with cache coherency patent, May 2003

Architectural support for thread level speculative execution patent, March 2008

Speculative multiaddress atomicity patent, May 2008

Low complexity speculative multithreading system based on unmodified microprocessor core patent, July 2008

Synchronization of parallel processes using speculative execution of synchronization instructions patent, March 2009

Method and apparatus for enforcing memory reference ordering requirements at the L1 cache level patent, April 2009

Safe store for speculative helper threads patent, February 2010

Verification of memory consistency and transactional memory patent, October 2010

Low complexity speculative multithreading system based on unmodified microprocessor core patent, November 2010

Automated partitioning of a computation for parallel or other high capability architecture patent, November 2011

Transactional memory in out-of-order processors patent, May 2012

Enabling speculative state information in a cache coherency protocol patent, May 2012

Context switching and synchronization patent, June 2012

Multi-thread packet processor patent-application, June 2002

Cache way prediction based on instruction base register patent-application, September 2002

System with wide operand architecture, and method patent-application, September 2002

Using an L2 directory to facilitate speculative loads in a multiprocessor system patent-application, December 2002

Fast and accurate cache way selection patent-application, January 2003

Stall technique to facilitate atomicity in processor execution of helper set patent-application, September 2004

Synchronization of parallel processes patent-application, September 2005

System, apparatus and method for performing look-ahead lookup on predictive information in a cache memory patent-application, February 2006

Memory controller and method for optimized read/modify/write performance patent-application, April 2006

Processor with cache way prediction and method thereof patent-application, May 2006

Fair sharing of a cache in a multi-core/multi-threaded processor by dynamically partitioning of the cache patent-application, June 2006

Transaction based shared data operations in a multiprocessor environment patent-application, July 2006

Implementation of load linked and store conditional operations patent-application, July 2006

Apparatus and method for sparse line write transactions patent-application, February 2007

Thread-Shared Software Code Caches patent-application, March 2007

Separate data/coherency caches in a shared memory multiprocessor system patent-application, July 2007

Architectural support for thread level speculative execution patent-application, August 2007

Snoop Filter Directory Mechanism in Coherency Shared Memory System patent-application, December 2007

Prefetch Miss Indicator for Cache Coherence Directory Misses on External Caches patent-application, August 2008

Low Complexity Speculative Multithreading System Based on Unmodified Microprocessor Core patent-application, October 2008

Computing System with Transactional Memory Using Millicode Assists patent-application, November 2008

Method, Apparatus, System and Program Product Supporting Improved Access Latency for a Sectored Directory patent-application, December 2008

Method and Apparatus for Employing Multi-Bit Register File Cells and SMT Thread Groups patent-application, December 2008

Speculative Memory Prefetch patent-application, January 2009

System and Method for Executing Nested Atomic Blocks Using Split Hardware Transactions patent-application, January 2009

Enabling Speculative State Information in a Cache Coherency Protocol patent-application, March 2009

Strand-Based Computing Hardware and Dynamically Optimizing Strandware for a High Performance Microprocessor System patent-application, June 2009

System and Method for Handling Overflow in Hardware Transactional Memory with Locks patent-application, July 2009

Efficient Deterministic Multiprocessing patent-application, September 2009

Early header CRC in data response packets with variable gap count patent-application, October 2009

Method, System and Apparatus for Reducing Memory Traffic in a Distributed Memory System patent-application, November 2009

Methods and apparatuses for improving speculation success in processors patent-application, May 2010

Cache control device and control method patent-application, July 2010

Using Time Stamps to Facilitate Load Reordering patent-application, August 2010

Multi-Domain Management of a Cache in a Processor System patent-application, September 2010

Using Domains for Physical Address Management in a Multiprocessor System patent-application, September 2010

Hierarchical Bloom Filters for Facilitating Concurrency Control patent-application, December 2010

Transactional Conflict Resolution Based on Locality patent-application, January 2011

Detecting Task Complete Dependencies Using Underlying Speculative Multi-Threading Hardware patent-application, March 2011

Store Aware Prefetching for a Datastream patent-application, March 2011

Conditional Load Store in a Shared Cache patent-application, May 2011

Atomic Commit Predicated on Consistency of Watches patent-application, June 2011

Cache Spill Management Techniques patent-application, June 2011

Physical Aliasing for Thread Level Speculation with a Speculation Blind Cache patent-application, August 2011

Pre-Fetching for a Sibling Cache patent-application, September 2011

Scatter-Add in Data Parallel Architectures conference, January 2005

Active memory operations conference, January 2007

Process coordination with fetch-and-increment conference, January 1991

Transactional Memory: An Overview journal, May 2007

On the value locality of store instructions conference, January 2000

A fetch-and-op implementation for parallel computers conference, January 1988

Algorithms for scalable synchronization on shared-memory multiprocessors journal, February 1991

Odd boundary address aligned direct memory acess device and method
patent, December 1992

Processor associated blocking symbol controls for serializing the accessing of data resources in a computer system
patent, April 1999

Eviction override for larx-reserved addresses
patent, April 2001

Apparatus and method for preventing cache data eviction during an atomic operation
patent, February 2002

System and method providing cache coherency and atomic memory operations in a multiprocessor computer architecture
patent, March 2002

Detecting full conditions in a queue
patent, October 2002

Information processing apparatus with cache coherency
patent, May 2003

Architectural support for thread level speculative execution
patent, March 2008

Speculative multiaddress atomicity
patent, May 2008

Low complexity speculative multithreading system based on unmodified microprocessor core
patent, July 2008

Synchronization of parallel processes using speculative execution of synchronization instructions
patent, March 2009

Method and apparatus for enforcing memory reference ordering requirements at the L1 cache level
patent, April 2009

Safe store for speculative helper threads
patent, February 2010

Verification of memory consistency and transactional memory
patent, October 2010

Low complexity speculative multithreading system based on unmodified microprocessor core
patent, November 2010

Automated partitioning of a computation for parallel or other high capability architecture
patent, November 2011

Transactional memory in out-of-order processors
patent, May 2012

Enabling speculative state information in a cache coherency protocol
patent, May 2012

Context switching and synchronization
patent, June 2012

Multi-thread packet processor
patent-application, June 2002

Cache way prediction based on instruction base register
patent-application, September 2002

System with wide operand architecture, and method
patent-application, September 2002

Using an L2 directory to facilitate speculative loads in a multiprocessor system
patent-application, December 2002

Fast and accurate cache way selection
patent-application, January 2003

Stall technique to facilitate atomicity in processor execution of helper set
patent-application, September 2004

Synchronization of parallel processes
patent-application, September 2005

System, apparatus and method for performing look-ahead lookup on predictive information in a cache memory
patent-application, February 2006

Memory controller and method for optimized read/modify/write performance
patent-application, April 2006

Processor with cache way prediction and method thereof
patent-application, May 2006

Fair sharing of a cache in a multi-core/multi-threaded processor by dynamically partitioning of the cache
patent-application, June 2006

Transaction based shared data operations in a multiprocessor environment
patent-application, July 2006

Implementation of load linked and store conditional operations
patent-application, July 2006

Apparatus and method for sparse line write transactions
patent-application, February 2007

Thread-Shared Software Code Caches
patent-application, March 2007

Separate data/coherency caches in a shared memory multiprocessor system
patent-application, July 2007

Architectural support for thread level speculative execution
patent-application, August 2007

Snoop Filter Directory Mechanism in Coherency Shared Memory System
patent-application, December 2007

Prefetch Miss Indicator for Cache Coherence Directory Misses on External Caches
patent-application, August 2008

Low Complexity Speculative Multithreading System Based on Unmodified Microprocessor Core
patent-application, October 2008

Computing System with Transactional Memory Using Millicode Assists
patent-application, November 2008

Method, Apparatus, System and Program Product Supporting Improved Access Latency for a Sectored Directory
patent-application, December 2008

Method and Apparatus for Employing Multi-Bit Register File Cells and SMT Thread Groups
patent-application, December 2008

Speculative Memory Prefetch
patent-application, January 2009

System and Method for Executing Nested Atomic Blocks Using Split Hardware Transactions
patent-application, January 2009

Enabling Speculative State Information in a Cache Coherency Protocol
patent-application, March 2009

Strand-Based Computing Hardware and Dynamically Optimizing Strandware for a High Performance Microprocessor System
patent-application, June 2009

System and Method for Handling Overflow in Hardware Transactional Memory with Locks
patent-application, July 2009

Efficient Deterministic Multiprocessing
patent-application, September 2009

Early header CRC in data response packets with variable gap count
patent-application, October 2009

Method, System and Apparatus for Reducing Memory Traffic in a Distributed Memory System
patent-application, November 2009

Methods and apparatuses for improving speculation success in processors
patent-application, May 2010

Cache control device and control method
patent-application, July 2010

Using Time Stamps to Facilitate Load Reordering
patent-application, August 2010

Multi-Domain Management of a Cache in a Processor System
patent-application, September 2010

Using Domains for Physical Address Management in a Multiprocessor System
patent-application, September 2010

Hierarchical Bloom Filters for Facilitating Concurrency Control
patent-application, December 2010

Transactional Conflict Resolution Based on Locality
patent-application, January 2011

Detecting Task Complete Dependencies Using Underlying Speculative Multi-Threading Hardware
patent-application, March 2011

Store Aware Prefetching for a Datastream
patent-application, March 2011

Conditional Load Store in a Shared Cache
patent-application, May 2011

Atomic Commit Predicated on Consistency of Watches
patent-application, June 2011

Cache Spill Management Techniques
patent-application, June 2011

Physical Aliasing for Thread Level Speculation with a Speculation Blind Cache
patent-application, August 2011

Pre-Fetching for a Sibling Cache
patent-application, September 2011

Scatter-Add in Data Parallel Architectures
conference, January 2005

Active memory operations
conference, January 2007

Process coordination with fetch-and-increment
conference, January 1991

Transactional Memory: An Overview
journal, May 2007

On the value locality of store instructions
conference, January 2000

A fetch-and-op implementation for parallel computers
conference, January 1988

Algorithms for scalable synchronization on shared-memory multiprocessors
journal, February 1991