dlb

dynamic load balancing library and tools for HPC parallel applications

TLDR

List CPU affinity of all DLB processes

$ dlb_taskset --list

Set CPU affinity for a DLB process

$ dlb_taskset --set [0-3] --pid [pid]

Borrow CPUs for a new application

$ dlb_taskset --borrow --set [0-7] -- [application]

Display help information

$ dlb_taskset --help

SYNOPSIS

dlb_taskset [options] [--] [command]

DLB (Dynamic Load Balancing) is a library that dynamically redistributes computational resources among processes within the same shared memory node. It improves load balance of the outer level of parallelism (e.g., MPI) by adjusting resources at the inner level (e.g., OpenMP).DLB provides three main components: LeWI (Lend When Idle) redistributes unused CPUs between processes, DROM (Dynamic Resource Ownership Manager) manages CPU affinity, and TALP (Tracking Application Live Performance) gathers performance data.The dlb_taskset command-line tool manages CPU affinity of DLB-enabled processes and can launch new applications with specific CPU assignments.

PARAMETERS

--list

List CPU affinity of all DLB processes.

--set MASK

Set CPU affinity mask for a process.

--pid PID

Specify process ID to operate on.

--borrow

Borrow CPUs instead of stealing; CPUs are returned when the application ends.

--color WHEN

Colorize output (yes, auto, no).

--help

Display help information.

CAVEATS

Requires DLB-enabled applications linked against the DLB library. Best suited for iterative HPC applications with varying workloads. Processes must run on the same shared memory node.

HISTORY

DLB was developed at the Barcelona Supercomputing Center (BSC) for high-performance computing applications. It is distributed under the LGPL-3.0 license.

dlb