Patent application number | Description | Published |
20130159684 | BATCHED REPLAYS OF DIVERGENT OPERATIONS - One embodiment of the present invention sets forth an optimized way to execute replay operations for divergent operations in a parallel processing subsystem. Specifically, the streaming multiprocessor (SM) includes a multistage pipeline configured to batch two or more replay operations for processing via replay loop. A logic element within the multistage pipeline detects whether the current pipeline stage is accessing a shared resource, such as loading data from a shared memory. If the threads are accessing data which are distributed across multiple cache lines, then the multistage pipeline batches two or more replay operations, where the replay operations are inserted into the pipeline back-to-back. Advantageously, divergent operations requiring two or more replay operations operate with reduced latency. Where memory access operations require transfer of more than two cache lines to service all threads, the number of clock cycles required to complete all replay operations is reduced. | 06-20-2013 |
20130166877 | SHAPED REGISTER FILE READS - One embodiment of the present invention sets forth a technique for performing a shaped access of a register file that includes a set of N registers, wherein N is greater than or equal to two. The technique involves, for at least one thread included in a group of threads, receiving a request to access a first amount of data from each register in the set of N registers, and configuring a crossbar to allow the at least one thread to access the first amount of data from each register in the set of N registers. | 06-27-2013 |
20130166882 | METHODS AND APPARATUS FOR SCHEDULING INSTRUCTIONS WITHOUT INSTRUCTION DECODE - Systems and methods for scheduling instructions without instruction decode. In one embodiment, a multi-core processor includes a scheduling unit in each core for scheduling instructions from two or more threads scheduled for execution on that particular core. As threads are scheduled for execution on the core, instructions from the threads are fetched into a buffer without being decoded. The scheduling unit includes a macro-scheduler unit for performing a priority sort of the two or more threads and a micro-scheduler arbiter for determining the highest order thread that is ready to execute. The macro-scheduler unit and the micro-scheduler arbiter use pre-decode data to implement the scheduling algorithm. The pre-decode data may be generated by decoding only a small portion of the instruction or received along with the instruction. Once the micro-scheduler arbiter has selected an instruction to dispatch to the execution unit, a decode unit fully decodes the instruction. | 06-27-2013 |
20130212364 | PRE-SCHEDULED REPLAYS OF DIVERGENT OPERATIONS - One embodiment of the present disclosure sets forth an optimized way to execute pre-scheduled replay operations for divergent operations in a parallel processing subsystem. Specifically, a streaming multiprocessor (SM) includes a multi-stage pipeline configured to insert pre-scheduled replay operations into a multi-stage pipeline. A pre-scheduled replay unit detects whether the operation associated with the current instruction is accessing a common resource. If the threads are accessing data which are distributed across multiple cache lines, then the pre-scheduled replay unit inserts pre-scheduled replay operations behind the current instruction. The multi-stage pipeline executes the instruction and the associated pre-scheduled replay operations sequentially. If additional threads remain unserviced after execution of the instruction and the pre-scheduled replay operations, then additional replay operations are inserted via the replay loop, until all threads are serviced. One advantage of the disclosed technique is that divergent operations requiring one or more replay operations execute with reduced latency. | 08-15-2013 |
20130232322 | UNIFORM LOAD PROCESSING FOR PARALLEL THREAD SUB-SETS - One embodiment of the present invention sets forth a technique for processing load instructions for parallel threads of a thread group when a sub-set of the parallel threads request the same memory address. The load/store unit determines if the memory addresses for each sub-set of parallel threads match based on one or more uniform patterns. When a match is achieved for at least one of the uniform patterns, the load/store unit transmits a read request to retrieve data for the sub-set of parallel threads. The number of read requests transmitted is reduced compared with performing a separate read request for each thread in the sub-set. A variety of uniform patterns may be defined based on common access patterns present in program instructions. A variety of uniform patterns may also be defined based on interconnect constraints between the load/store unit and the memory when a full crossbar interconnect is not available. | 09-05-2013 |
20130268715 | DYNAMIC BANK MODE ADDRESSING FOR MEMORY ACCESS - One embodiment sets forth a technique for dynamically mapping addresses to banks of a multi-bank memory based on a bank mode. Application programs may be configured to perform read and write a memory accessing different numbers of bits per bank, e.g., 32-bits per bank, 64-bits per bank, or 128-bits per bank. On each clock cycle an access request may be received from one of the application programs and per processing thread addresses of the access request are dynamically mapped based on the bank mode to produce a set of bank addresses. The bank addresses are then used to access the multi-bank memory. Allowing different bank mappings enables each application program to avoid bank conflicts when the memory is accesses compared with using a single bank mapping for all accesses. | 10-10-2013 |
20130311686 | MECHANISM FOR TRACKING AGE OF COMMON RESOURCE REQUESTS WITHIN A RESOURCE MANAGEMENT SUBSYSTEM - One embodiment of the present disclosure sets forth an effective way to maintain fairness and order in the scheduling of common resource access requests related to replay operations. Specifically, a streaming multiprocessor (SM) includes a total order queue (TOQ) configured to schedule the access requests over one or more execution cycles. Access requests are allowed to make forward progress when needed common resources have been allocated to the request. Where multiple access requests require the same common resource, priority is given to the older access request. Access requests may be placed in a sleep state pending availability of certain common resources. Deadlock may be avoided by allowing an older access request to steal resources from a younger resource request. One advantage of the disclosed technique is that older common resource access requests are not repeatedly blocked from making forward progress by newer access requests. | 11-21-2013 |
20130311996 | MECHANISM FOR WAKING COMMON RESOURCE REQUESTS WITHIN A RESOURCE MANAGEMENT SUBSYSTEM - One embodiment of the present disclosure sets forth an effective way to maintain fairness and order in the scheduling of common resource access requests related to replay operations. Specifically, a streaming multiprocessor (SM) includes a total order queue (TOQ) configured to schedule the access requests over one or more execution cycles. Access requests are allowed to make forward progress when needed common resources have been allocated to the request. Where multiple access requests require the same common resource, priority is given to the older access request. Access requests may be placed in a sleep state pending availability of certain common resources. Deadlock may be avoided by allowing an older access request to steal resources from a younger resource request. One advantage of the disclosed technique is that older common resource access requests are not repeatedly blocked from making forward progress by newer access requests. | 11-21-2013 |
20130311999 | RESOURCE MANAGEMENT SUBSYSTEM THAT MAINTAINS FAIRNESS AND ORDER - One embodiment of the present disclosure sets forth an effective way to maintain fairness and order in the scheduling of common resource access requests related to replay operations. Specifically, a streaming multiprocessor (SM) includes a total order queue (TOQ) configured to schedule the access requests over one or more execution cycles. Access requests are allowed to make forward progress when needed common resources have been allocated to the request. Where multiple access requests require the same common resource, priority is given to the older access request. Access requests may be placed in a sleep state pending availability of certain common resources. Deadlock may be avoided by allowing an older access request to steal resources from a younger resource request. One advantage of the disclosed technique is that older common resource access requests are not repeatedly blocked from making forward progress by newer access requests. | 11-21-2013 |