性能

发射效率issue efficiency

发射效率 (Issue efficiency) 用于衡量 线程束调度器 通过从 就绪线程束 发射指令,使执行流水线保持忙碌状态的效率。

在该示意图的四个时钟周期中,有三个周期发射了指令,因此发射效率为75%。该图灵感来源于GTC 2025上的 *CUDA Techniques to Maximize Compute and Instruction Throughput*演讲。

发射效率为 100% 意味着每个 调度器 在每个周期都发射了一条指令,表明每个周期至少有一个 就绪线程束。低于 100% 的数值表明,在某些周期内,所有 活跃线程束 都处于 停滞状态——正在等待数据、资源或依赖关系——因此 调度器 处于空闲状态,整体指令吞吐量下降。

英文原文(Modal GPU Glossary)

Issue efficiency measures how effectively the warp scheduler keeps execution pipes busy by issuing instructions from eligible warps.

talk at GTC 2025.](themed-image://cycles.svg)

An issue efficiency of 100% means every scheduler issued an instruction on every cycle, indicating at least one eligible warp on each cycle. Values below 100 % signal that, during some cycles, all active warps were stalled - waiting on data, resources, or dependencies - so the scheduler sat idle and overall instruction throughput fell.

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本词条改编自 Modal GPU Glossary(CC BY 4.0)· 中文翻译 miter6/gpu-glossary-zh,MAE 整理排版。