| 8.11. False Sharing | ||
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 | Chapter 8. Issue Reference |  |
| 8.11. False Sharing | ||
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| | Chapter 8. Issue Reference | |
A false sharing issue is reported when Freja finds two locations in different threads, or rather in threads bound to different caches, that access unrelated data in the same cache line. This causes coherence misses, coherence write-backs or upgrades, which could be avoided with different placement of the data. See Section 5.4.1, “False Sharing” for a more thorough description of false sharing.
The false sharing issue has these sections:
Instructions causing false sharing of the cache line. There are always pairs of instructions involved in a false sharing situation. This section lists the other instructions. Focus on separating the data accessed by the different threads, or arrange to divide data between the two threads along a cache line.
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| 8.10. Non-Temporal Data |  | 8.12. Communication Hot-Spot |
