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性能数据中如果Bad_Speculation占比超过20%，超过TMA 1%-5%较多，是否定义为性能瓶颈？Bad_Speculation占比较高一般是什么导致的呢，求解答 #15

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hayyaw opened this issue Sep 20, 2023 · 1 comment
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性能数据中如果Bad_Speculation占比超过20%，超过TMA 1%-5%较多，是否定义为性能瓶颈？Bad_Speculation占比较高一般是什么导致的呢，求解答 #15

hayyaw opened this issue Sep 20, 2023 · 1 comment

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@hayyaw
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hayyaw commented Sep 20, 2023

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@youzhedian
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一般只认为当前性能数据中TMA占比最高的为性能瓶颈，贪心地降低占比最高的那一项。
如果是Bad_Speculation占比高，可以考虑减少分支判断，减少分支预测失败，过程中可以观察Metric_BR_Mispred_Ratio的数值是否能按预期下降

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@youzhedian @hayyaw