RDNA2 Counters

General Group

Counter Name

Usage

Brief Description

Wavefronts

Items

Total wavefronts.

VALUInsts

Items

The average number of vector ALU instructions executed per work-item (affected by flow control).

SALUInsts

Items

The average number of scalar ALU instructions executed per work-item (affected by flow control).

VFetchInsts

Items

The average number of vector fetch instructions from the video memory executed per work-item (affected by flow control). Excludes FLAT instructions that fetch from video memory.

SFetchInsts

Items

The average number of scalar fetch instructions from the video memory executed per work-item (affected by flow control).

VWriteInsts

Items

The average number of vector write instructions to the video memory executed per work-item (affected by flow control). Excludes FLAT instructions that write to video memory.

GDSInsts

Items

The average number of GDS read or GDS write instructions executed per work item (affected by flow control).

VALUUtilization

Percentage

The percentage of active vector ALU threads in a wave. A lower number can mean either more thread divergence in a wave or that the work-group size is not a multiple of the wave size. Value range: 0% (bad), 100% (ideal – no thread divergence).

VALUBusy

Percentage

The percentage of GPUTime vector ALU instructions are processed. Value range: 0% (bad) to 100% (optimal).

SALUBusy

Percentage

The percentage of GPUTime scalar ALU instructions are processed. Value range: 0% (bad) to 100% (optimal).

LocalMemory Group

Counter Name

Usage

Brief Description

LDSInsts

Items

The average number of LDS read or LDS write instructions executed per work item (affected by flow control).

LDSBankConflict

Percentage

The percentage of GPUTime LDS is stalled by bank conflicts. Value range: 0% (optimal) to 100% (bad).

GlobalMemory Group

Counter Name

Usage

Brief Description

FetchSize

Kilobytes

The total kilobytes fetched from the video memory. This is measured with all extra fetches and any cache or memory effects taken into account.

WriteSize

Kilobytes

The total kilobytes written to the video memory. This is measured with all extra fetches and any cache or memory effects taken into account.

L0CacheHit

Percentage

The percentage of fetch, write, atomic, and other instructions that hit the data in L0 cache. Value range: 0% (no hit) to 100% (optimal).

L1CacheHit

Percentage

The percentage of fetch, write, atomic, and other instructions that hit the data in L1 cache. Writes and atomics always miss this cache. Value range: 0% (no hit) to 100% (optimal).

L2CacheHit

Percentage

The percentage of fetch, write, atomic, and other instructions that hit the data in L2 cache. Value range: 0% (no hit) to 100% (optimal).

MemUnitBusy

Percentage

The percentage of GPUTime the memory unit is active. The result includes the stall time (MemUnitStalled). This is measured with all extra fetches and writes and any cache or memory effects taken into account. Value range: 0% to 100% (fetch-bound).

MemUnitStalled

Percentage

The percentage of GPUTime the memory unit is stalled. Try reducing the number or size of fetches and writes if possible. Value range: 0% (optimal) to 100% (bad).

WriteUnitStalled

Percentage

The percentage of GPUTime the Write unit is stalled. Value range: 0% to 100% (bad).