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Merge pull request #262 from Eliyahu-Ravuna/patch-10

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Access memory predictably - Revised according to the feedback in #256
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Gabriel Dos Reis
2015-10-02 06:40:59 -07:00
parent 57d06f2138 8050963a06
commit f72217f30c
1 changed files with 13 additions and 1 deletions
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CppCoreGuidelines.md
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@@ -8660,7 +8660,19 @@ make the job of the optimizer much harder. Simple code often optimizes better th
Performance is very sensitive to cache performance and cache algorithms favor simple (usually linear) access to adjacent data. Performance is very sensitive to cache performance and cache algorithms favor simple (usually linear) access to adjacent data.
??? ##### Example
int matrix[rows][cols];
//bad
for(int c=0; c<cols; ++c)
for(int r=0; r<rows; ++r)
sum += matrix[r][c];
//good
for(int r=0; r<rows; ++r)
for(int c=0; c<cols; ++c)
sum += matrix[r][c];
### <a name="Rper-context"></a> PER.30: Avoid context switches on the critical path ### <a name="Rper-context"></a> PER.30: Avoid context switches on the critical path