vtune中几个参数

L2 Hit Rate : The L2 is the last and longest-latency level in the memory hierarchy before DRAM or MCDRAM. While L2 hits are serviced much more quickly than hits in DRAM or MCDRAM, they can still incur a significant performance penalty. This metric provides a ratio of the demand load requests that hit the L2 to the total number of the demand load requests serviced by the L2. This metric does not include instruction fetches
L2 命中率: L2 是内存层次结构中在 DRAM 或 MCDRAM 之前的最后和最长的延迟级别。虽然 L2 命中的服务速度比 DRAM 或 MCDRAM 中的点击率要快得多, 但它们仍可能招致显著的性能损失。此度量提供了将 L2 到 L2 所服务的需求负载请求的总数量的需求负载请求的比率。此度量不包括指令读取


L2 Hit Bound : The L2 is the last and longest-latency level in the memory hierarchy before the main memory (DRAM) or MCDRAM. While L2 hits are serviced much more quickly than hits in DRAM or MCDRAM, they can still incur a significant performance penalty. This metric also includes coherence penalties for shared data. The L2 Hit Bound metric shows a ratio of cycles spent handling L2 hits to all cycles. The cycles spent handling L2 hits are calculated as L2 CACHE HIT COST * L2 CACHE HIT COUNT where L2 CACHE HIT COST is a constant measured as typical L2 access latency in cycles.
L2 命中绑定: L2 是内存层次结构中在主存 (DRAM) 或 MCDRAM 之前的最后和最长的延迟级别。虽然 L2 命中的服务速度比 DRAM 或 MCDRAM 中的点击率要快得多, 但它们仍可能招致显著的性能损失。此度量还包括对共享数据的一致性惩罚。L2 命中绑定度量显示了处理 L2 命中的周期与所有周期的比率。处理 L2 命中的周期被计算为  L2 CACHE HIT COST * L2 CACHE HIT COUNT , 其中 L2 CACHE HIT COST 是一个常量, 作为典型的 L2 访问延迟在周期中被测量。




L2 Miss Bound : The L2 is the last and longest-latency level in the memory hierarchy before the main memory (DRAM) or MCDRAM. Any memory requests missing here must be serviced by local or remote DRAM or MCDRAM, with significant latency. The L2 Miss Bound metric shows a ratio of cycles spent handling L2 misses to all cycles. The cycles spent handling L2 misses are calculated as L2 CACHE MISS COST * L2 CACHE MISS COUNT where L2 CACHE MISS COST is a constant measured as typical DRAM access latency in cycles
L2 Miss Bound 度量显示了处理 L2 错过的循环的比率。处理 L2 错过的周期被计算为 L2 CACHE MISS COST * L2 CACHE MISS COUNT, 其中 L2 CACHE MISS COST 是一个常数测量为典型的 DRAM 访问滞后周期




MCDRAM Bandwidth Bound : This metric represents percentage of elapsed time the system spent with high MCDRAM bandwidth utilization. Review the Bandwidth Utilization Histogram to estimate the scale of the issue.
此度量表示系统用于高 MCDRAM 带宽利用率的运行时间的百分比。查看带宽利用率直方图以估计问题的规模。


DRAM Bandwidth Bound : This metric represents percentage of elapsed time the system spent with high DRAM bandwidth utilization. Since this metric relies on the accurate peak system DRAM bandwidth measurement, explore the Bandwidth Utilization Histogram and make sure the Low/Medium/High utilization thresholds are correct for your system. You can manually adjust them, if required.
此度量表示系统在高 DRAM 带宽利用率时所用的运行时间的百分比。由于此度量依赖于精确的峰值系统 DRAM 带宽测量, 因此请探索带宽利用率直方图, 并确保系统的低/中/高利用率阈值是正确的。如果需要, 您可以手动调整它们。