Abstract: Processing of a storage operand request identified as restrained is selectively, temporarily suppressed. The processing includes identifying a storage operand request as restrained, where the identifying includes obtaining, by a processing unit, an access intent instruction indicating an access intent associated with an operand of a next sequential instruction. The access intent indicates usage of the storage operand request is restrained. Further, the method includes determining whether a storage operand request is to a common storage location shared by multiple processing units of a computing environment and is identified restrained, and based on determining that the storage operand request is restrained, then temporarily suppressing requesting access to the common storage location pursuant to the storage operand request.

Abstract: Processing of a storage operand request identified as restrained is selectively, temporarily suppressed. The processing includes identifying a storage operand request as restrained, where the identifying includes obtaining, by a processing unit, an access intent instruction indicating an access intent associated with an operand of a next sequential instruction. The access intent indicates usage of the storage operand request is restrained. Further, the method includes determining whether a storage operand request is to a common storage location shared by multiple processing units of a computing environment and is identified restrained, and based on determining that the storage operand request is restrained, then temporarily suppressing requesting access to the common storage location pursuant to the storage operand request.

Abstract: Processing of a storage operand request identified as restrained is selectively, temporarily suppressed. The processing includes determining whether a storage operand request to a common storage location shared by multiple processing units of a computing environment is restrained, and based on determining that the storage operand request is restrained, then temporarily suppressing requesting access to the common storage location pursuant to the storage operand request. The processing unit performing the processing may proceed with processing of the restrained storage operand request, without performing the suppressing, where the processing can be accomplished using cache private to the processing unit. Otherwise the suppressing may continue until an instruction, or operation of an instruction, associated with the storage operand request is next to complete.

Abstract: A computing environment facility is provided to extend a hold of a cache line in private (or local) cache exclusively after processing a storage operand request. The facility includes determining whether a storage operand request to a storage location shared by multiple processing units of the computing environment is designated hold. In addition, a determination is made whether a state of the corresponding cache line in private cache used for processing the storage operand request is owned exclusively. Based on determining that the storage operand request is designated hold, and that the state of the corresponding cache line in private cache used for processing the storage operand request is owned exclusively, continuing to hold the corresponding cache line in the private cache exclusively after completing processing of the storage operand request. The continuing to hold may include initiating a counter to facilitate the continuing hold for a desired, set interval.

Abstract: A system and method for implementing a servicing instruction for a plurality of counters that includes determining a counter set based on the servicing instruction, whether access is authorized to the counter set, and a block of storage in a memory based on the service instruction. In response to the determining that the access is authorized, the system and method extracts the plurality of counters within the counter set in response to the determining that the access is authorized and storing the plurality of counters in the block of storage.

Abstract: Processing of a storage operand request identified as restrained is selectively, temporarily suppressed. The processing includes determining whether a storage operand request to a common storage location shared by multiple processing units of a computing environment is restrained, and based on determining that the storage operand request is restrained, then temporarily suppressing requesting access to the common storage location pursuant to the storage operand request. The processing unit performing the processing may proceed with processing of the restrained storage operand request, without performing the suppressing, where the processing can be accomplished using cache private to the processing unit. Otherwise the suppressing may continue until an instruction, or operation of an instruction, associated with the storage operand request is next to complete.

Abstract: Processing of a storage operand request identified as restrained is selectively, temporarily suppressed. The processing includes determining whether a storage operand request to a common storage location shared by multiple processing units of a computing environment is restrained, and based on determining that the storage operand request is restrained, then temporarily suppressing requesting access to the common storage location pursuant to the storage operand request. The processing unit performing the processing may proceed with processing of the restrained storage operand request, without performing the suppressing, where the processing can be accomplished using cache private to the processing unit. Otherwise the suppressing may continue until an instruction, or operation of an instruction, associated with the storage operand request is next to complete.

Abstract: A facility is provided for collecting time-slice-instrumentation information during processing unit execution. The facility counts, at least in part, occurrence of a specified processing unit event during a time-slice of processing unit execution. The counted events occurring during a first interval of execution and a second interval of execution of the time-slice are retained. The first interval of execution is earlier in the time-slice than the second interval of execution, and the counted events facilitate adjusting performance of the processing unit. In an embodiment, the time-slice is a contiguous period of time of processing unit execution, and the specified processing unit event includes a cache event. The processing unit may interleave processing of multiple different units of work across multiple contiguous time-slices, and during a single time-slice, a single unit of work of the multiple different units of work is processed by the processing unit.

Abstract: Embodiments relate tracking utilization in a multithreading (MT) computer system. According to one aspect, a computer system includes a configuration with a core configured to operate in a MT that supports multiple threads on shared resources of the core. The core is configured to perform a method that includes resetting a plurality of utilization counters. The utilization counters include a plurality of sets of counters. During each clock cycle on the core, a set of counters is selected from the plurality of sets of counters. The selecting is based on a number of currently active threads on the core. In addition, during each clock cycle a counter in the selected set of counters is incremented based on an aggregation of one or more execution events at the multiple threads of the core. Values of the utilization counters are provided to a software program.

Abstract: Embodiments relate tracking utilization in a multithreading (MT) computer system. According to one aspect, a computer system includes a configuration with a core configured to operate in a MT that supports multiple threads on shared resources of the core. The core is configured to perform a method that includes resetting a plurality of utilization counters. The utilization counters include a plurality of sets of counters. During each clock cycle on the core, a set of counters is selected from the plurality of sets of counters. The selecting is based on a number of currently active threads on the core. In addition, during each clock cycle a counter in the selected set of counters is incremented based on an aggregation of one or more execution events at the multiple threads of the core. Values of the utilization counters are provided to a software program.

Abstract: A computing environment facility is provided to extend a hold of a cache line in private (or local) cache exclusively after processing a storage operand request. The facility includes determining whether a storage operand request to a storage location shared by multiple processing units of the computing environment is designated hold. In addition, a determination is made whether a state of the corresponding cache line in private cache used for processing the storage operand request is owned exclusively. Based on determining that the storage operand request is designated hold, and that the state of the corresponding cache line in private cache used for processing the storage operand request is owned exclusively, continuing to hold the corresponding cache line in the private cache exclusively after completing processing of the storage operand request. The continuing to hold may include initiating a counter to facilitate the continuing hold for a desired, set interval.

Abstract: Processing of a storage operand request identified as restrained is selectively, temporarily suppressed. The processing includes determining whether a storage operand request to a common storage location shared by multiple processing units of a computing environment is restrained, and based on determining that the storage operand request is restrained, then temporarily suppressing requesting access to the common storage location pursuant to the storage operand request. The processing unit performing the processing may proceed with processing of the restrained storage operand request, without performing the suppressing, where the processing can be accomplished using cache private to the processing unit. Otherwise the suppressing may continue until an instruction, or operation of an instruction, associated with the storage operand request is next to complete.

Abstract: A facility is provided for collecting time-slice-instrumentation information during processing unit execution. The facility counts, at least in part, occurrence of a specified processing unit event during a time-slice of processing unit execution. The counted events occurring during a first interval of execution and a second interval of execution of the time-slice are retained. The first interval of execution is earlier in the time-slice than the second interval of execution, and the counted events facilitate adjusting performance of the processing unit. In an embodiment, the time-slice is a contiguous period of time of processing unit execution, and the specified processing unit event includes a cache event. The processing unit may interleave processing of multiple different units of work across multiple contiguous time-slices, and during a single time-slice, a single unit of work of the multiple different units of work is processed by the processing unit.

Abstract: A system and method for implementing a servicing instruction for a plurality of counters that includes determining a counter set based on the servicing instruction, whether access is authorized to the counter set, and a block of storage in a memory based on the service instruction. In response to the determining that the access is authorized, the system and method extracts the plurality of counters within the counter set in response to the determining that the access is authorized and storing the plurality of counters in the block of storage.

Abstract: A system and method for implementing a servicing instruction for a plurality of counters that includes determining a counter set based on the servicing instruction, whether access is authorized to the counter set, and a block of storage in a memory based on the service instruction. In response to the determining that the access is authorized, the system and method extracts the plurality of counters within the counter set in response to the determining that the access is authorized and storing the plurality of counters in the block of storage.

Abstract: Embodiments of the disclosure relate to optimizing a memory nest for a workload. Aspects include an operating system determining the cache/memory footprint of each work unit of the workload and assigning a time slice to each work unit of the workload based on the cache/memory footprint of each work unit. Aspects further include executing the workload on a processor by providing each work unit access to the processor for the time slice assigned to each work unit.

Abstract: A system and method for implementing a servicing instruction for a plurality of counters that includes determining a counter set based on the servicing instruction, whether access is authorized to the counter set, and a block of storage in a memory based on the service instruction. In response to the determining that the access is authorized, the system and method extracts the plurality of counters within the counter set in response to the determining that the access is authorized and storing the plurality of counters in the block of storage.

Abstract: Embodiments of the disclosure relate to optimizing a memory nest for a workload. Aspects include an operating system determining the cache/memory footprint of each work unit of the workload and assigning a time slice to each work unit of the workload based on the cache/memory footprint of each work unit. Aspects further include executing the workload on a processor by providing each work unit access to the processor for the time slice assigned to each work unit.

Abstract: Embodiments of the disclosure relate to optimizing a memory nest for a workload. Aspects include an operating system determining the cache/memory footprint of each work unit of the workload and assigning a time slice to each work unit of the workload based on the cache/memory footprint of each work unit. Aspects further include executing the workload on a processor by providing each work unit access to the processor for the time slice assigned to each work unit.

Abstract: Embodiments of the disclosure relate to optimizing a memory nest for a workload. Aspects include an operating system determining the cache/memory footprint of each work unit of the workload and assigning a time slice to each work unit of the workload based on the cache/memory footprint of each work unit. Aspects further include executing the workload on a processor by providing each work unit access to the processor for the time slice assigned to each work unit.