# US 2013/0159575 A1 · Adaptive recovery for parallel reactive power throttling

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- Number: US 2013/0159575 A1
- Document ID: US20130159575A1
- Status: Published application
- Kind: A1
- Application number: 13/327,100
- Filed: 2011-12-15
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: International Business Machines Corporation
- Inventors: Thomas M. Gooding; Brant L. Knudson; Cory Lappi; Ruth J. Poole; Andrew T. Tauferner
- Web page: https://patentgrep.com/patent/US20130159575A1

## CPC

- G06F 1/3234: Power saving characterised by the action undertaken
- G06F 1/206: {comprising thermal management}
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

Power throttling may be used to conserve power and reduce heat in a parallel computing environment. Compute nodes in the parallel computing environment may be organized into groups based on, for example, whether they execute tasks of the same job or receive power from the same converter. Once one of compute nodes in the group detects that a parameter (i.e., temperature, current, power consumption, etc.) has exceeded a first threshold, power throttling on all the nodes in the group may be activated. However, before deactivating power throttling, a plurality of parameters associated with the group of compute nodes may be monitored to ensure they are all below a second threshold. If so, the power throttling for all of the compute nodes is deactivated.

## Claims

### Claim at position 1

-8. (canceled)

### Claim 9

A computer program product of managing a parallel computing system that comprises a plurality of compute nodes, the computer program product comprising:
a computer-readable storage medium having computer-readable program code embodied therewith, the computer-readable program code configured to:
monitor a first parameter associated with at least one of the plurality of compute nodes, wherein the first parameter comprises at least one of: a measured temperature, a measured current, and a measured power consumption, and wherein the plurality of compute nodes in the parallel computing system are coupled for data communications;
upon determining that the first parameter reaches or exceeds a first threshold for the first parameter, transmit a global interrupt to at least two of the plurality of compute nodes that are configured to reduce power consumption upon receiving the global interrupt, wherein the at least two compute nodes form an operational group that is a subset of the plurality of compute nodes;
after transmitting the global interrupt, determine whether second parameters respectively associated with each of the at least two compute nodes in the operational group reach or fall below a second threshold for the second parameters, wherein the second parameters comprise at least one of: a measured temperature, a measured current, and a measured power consumption; and
after all the second parameters reach or fall below the second threshold, cancel the global interrupt for the at least two compute nodes in the operational group.

### Claim 10 (depends on 9)

The computer program product of claim 9, wherein each of the at least two compute nodes in the operational group execute a task associated with the same job that is performed by the parallel computing system, wherein a job comprises a plurality of tasks.

### Claim 11 (depends on 9)

The computer program product of claim 9, wherein the first parameter is one of the second parameters.

### Claim 12 (depends on 11)

The computer program product of claim 11, wherein the first threshold is a maximum desired value of the first parameter and wherein the second threshold corresponds to a value that is less than the maximum desired value.

### Claim 13 (depends on 9)

The computer program product of claim 9, wherein the global interrupt is synchronized across the at least two compute nodes via a global clock signal shared between the compute nodes in the operational group such that a hardware element on each of the at least two compute nodes in the operational group idle simultaneously.

### Claim 14 (depends on 13)

The computer program product of claim 13, wherein the hardware element is one of a processor and a memory controller.

### Claim 15 (depends on 9)

The computer program product of claim 9 further comprising computer-readable program code configured to:
before transmitting the signal that cancels the global interrupt, determine that all the second parameters reach or fall below the second threshold for a plurality of readings measured at sequential times.

### Claim 16

A system, comprising:
a computer processor; and
a memory containing a program that, when executed on the computer processor, performs an operation for managing a parallel computing system that comprises a plurality of compute nodes, comprising:
monitoring a first parameter associated with at least one of the plurality of compute nodes, wherein the first parameter comprises at least one of: a measured temperature, a measured current, and a measured power consumption;
upon determining that the first parameter reaches or exceeds a first threshold for the first parameter, transmitting a global interrupt to at least two of the plurality of compute nodes that are configured to reduce power consumption upon receiving the global interrupt;
after transmitting the global interrupt, determining whether second parameters respectively associated with each of the at least two compute nodes reach or fall below a second threshold for the second parameters, wherein the second parameters comprise at least one of: a measured temperature, a measured current, and a measured power consumption; and
after all the second parameters reach or fall below the second threshold, cancelling the global interrupt for the compute nodes in the operational group.

### Claim 17 (depends on 16)

The system of claim 16, wherein each of the at least two compute nodes in the operational group execute a task associated with the same job that is performed by the parallel computing system, wherein a job comprises a plurality of tasks.

### Claim 18 (depends on 16)

The system of claim 16, wherein the first parameter is one of the second parameters.

### Claim 19 (depends on 18)

The system of claim 18, wherein the first threshold is a maximum desired value of the first parameter and wherein the second threshold corresponds to a value that is less than the maximum desired value.

### Claim 20 (depends on 16)

The system of claim 16, wherein the global interrupt is synchronized across the at least two compute nodes via a global clock signal shared between the compute nodes in the operational group such that a hardware element on each of the at least two compute nodes in the operational group idle simultaneously.