US 10,241,834 B2Granted

Bandwidth aware resource optimization

AssigneeInternational Business Machines Corporation

InventorsSangram Alapati, Hima B. Nimmagadda, Satish K. Sadasivam

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Abstract

An application workload is scheduled for execution by each of one or more processing cores operating in a first mode. Performance metrics for the each of the one or more processing cores and a memory component are monitored, wherein the memory component stores data necessary for the one or more processing cores to carry out instructions to complete the scheduled workload. If performance metrics are greater than a specified threshold, a number of the one or more processing cores handling the scheduled workload is reduced. If the performance metrics are not greater than the specified threshold, whether each of the processing cores of the processor is currently handling a scheduled workload is determined. If each of the processing cores of the processor is currently handling the scheduled workload, the processor is configured to operate in a second mode.

Claims17

Dependent claims

A method comprising:

scheduling, by a scheduler, an application workload for execution by each of one or more processing cores operating in a first mode, wherein a number of threads in each of the one or more processing cores executes the scheduled workload in accordance with the first mode;
monitoring, by the scheduler, performance metrics for the each of the one or more processing cores and a memory component, wherein the memory component stores data for the one or more processing cores to carry out instructions to complete the scheduled workload, wherein the monitored performance metrics includes a first number of instructions per cycle (IPCs) performed by the processor operating in a simultaneous multithreading (SMT) mode and a second number of IPCs performed by the processor operating in a single thread (ST) mode;
comparing the first number of IPCs performed by the processor operating in the SMT mode to a second number of IPCs performed by the processor operating in the ST mode;
responsive to determining that the first number of IPCs performed is not greater than a second number of IPCs performed, monitoring, by the scheduler, the performance metrics for the processor and the memory component while handling the scheduled workload in the SMT mode;
responsive to determining that the first number of IPCs performed is not greater than the second number of IPCs performed, maintaining, by the scheduler, that a number of processing cores handling the scheduled workload is to remain constant;
responsive to determining that the performance metrics are greater than a specified threshold, reducing, by the scheduler, a number of the one or more processing cores handling the scheduled workload;
responsive to determining that the performance metrics are not greater than the specified threshold, determining, by the scheduler, whether each of the processing cores of the processor is currently handling a scheduled workload;
and
responsive to determining that each of the processing cores of the processor is currently handling the scheduled workload, configuring, by the scheduler, the processor to operate in a second mode, wherein the number of threads in each of the one or more processing cores executes the scheduled workload in accordance with the second mode.

6 more elements

A computer program product comprising:

one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising:
program instructions to schedule an application workload for execution by each of one or more processing cores operating in a first mode, wherein a number of threads in each of the one or more processing cores executes the scheduled workload in accordance with the first mode;
program instructions to monitor performance metrics for the each of the one or more processing cores and a memory component, wherein the memory component stores data for the one or more processing cores to carry out instructions to complete the scheduled workload, wherein the monitored performance metrics includes a first number of instructions per cycle (IPCs) performed by the processor operating in a simultaneous multithreading (SMT) mode and a second number of IPCs performed by the processor operating in a single thread (ST) mode;
program instructions to compare the first number of IPCs performed by the processor operating in the SMT mode to a second number of IPCs performed by the processor operating in the ST mode;
program instructions to, responsive to determining that the first number of IPCs performed is not greater than a second number of IPCs performed, monitor, by the scheduler, the performance metrics for the processor and the memory component while handling the scheduled workload in the SMT mode;
program instructions to, responsive to determining that the first number of IPCs performed is not greater than the second number of IPCs performed, maintain, by the scheduler, that a number of processing cores handling the scheduled workload is to remain constant;
program instructions to, responsive to determining that the performance metrics are greater than a specified threshold, reduce a number of the one or more processing cores handling the scheduled workload;
program instructions to, responsive to determining that the performance metrics are not greater than the specified threshold, determine whether each of the processing cores of the processor is currently handling a scheduled workload;
and
program instructions to, responsive to determining that each of the processing cores of the processor is currently handling the scheduled workload, configure the processor to operate in a second mode, wherein the number of threads in each of the one or more processing cores executes the scheduled workload in accordance with the second mode.

7 more elements

A computer system comprising:

one or more computer processors;
one or more computer readable storage media;
program instructions stored on the one or more computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising:
program instructions to schedule an application workload for execution by each of one or more processing cores operating in a first mode, wherein a number of threads in each of the one or more processing cores executes the scheduled workload in accordance with the first mode;
program instructions to monitor performance metrics for the each of the one or more processing cores and a memory component, wherein the memory component stores data for the one or more processing cores to carry out instructions to complete the scheduled workload, wherein the monitored performance metrics includes a first number of instructions per cycle (IPCs) performed by the processor operating in a simultaneous multithreading (SMT) mode and a second number of IPCs performed by the processor operating in a single thread (ST) mode;
program instructions to compare the first number of IPCs performed by the processor operating in the SMT mode to a second number of IPCs performed by the processor operating in the ST mode;
program instructions to, responsive to determining that the first number of IPCs performed is not greater than a second number of IPCs performed, monitor, by the scheduler, the performance metrics for the processor and the memory component while handling the scheduled workload in the SMT mode;
program instructions to, responsive to determining that the first number of IPCs performed is not greater than the second number of IPCs performed, maintain, by the scheduler, that a number of processing cores handling the scheduled workload is to remain constant;
program instructions to, responsive to determining that the performance metrics are greater than a specified threshold, reduce a number of the one or more processing cores handling the scheduled workload;
program instructions to, responsive to determining that the performance metrics are not greater than the specified threshold, determine whether each of the processing cores of the processor is currently handling a scheduled workload;
and
program instructions to, responsive to determining that each of the processing cores of the processor is currently handling the scheduled workload, configure the processor to operate in a second mode, wherein the number of threads in each of the one or more processing cores executes the scheduled workload in accordance with the second mode.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/362,878Filed 29 Nov 2016
Published: US 2018/0150333 A131 May 2018
Granted: 26 Mar 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

G06F 9/50
Multiprogramming arrangements: allocation of resources, e.g. of the central processing unit [CPU]
G06F 9/48
Multiprogramming arrangements: program initiating; Program switching, e.g. by interrupt
G06F 9/4843
Task transfer initiation or dispatching: by program, e.g. task dispatcher, supervisor, operating system
G06F 9/485
By program, e.g. task dispatcher, supervisor, operating system: task life-cycle, e.g. stopping, restarting, resuming execution