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@jinjiwu jinjiwu commented Jan 22, 2022

提示:请在 PR 描述中说明使用的 CPU 有多少核、多少线程哦 :)
如果不希望写 PR 描述,也可以直接在代码注释里写,没问题的~

内核数:4
逻辑核心:8
线程数:默认创建,应该是8?

实验结果

除了saxpy和scanner之外,其余函数都有明显的速度提升,原因未找到

fill: 0.59706s
fill: 0.607065s
fill_parallel: 0.134176s
fill_parallel: 0.13482s
saxpy: 0.0321525s
saxpy_parallel: 0.031659s
sqrtdot: 0.0801601s
5165.4
sqrtdot_parallel: 0.0160526s
5792.62
minvalue: 0.0724999s
-1.11803
minvalue_parallel: 0.0109034s
-1.11803
magicfilter: 0.272147s
55924034
magicfilter_parallel: 0.164996s
55924034
scanner: 0.0879465s
6.18926e+07
scanner_patallel: 0.132198s
6.18926e+07

完成情况

  • fill :使用tbb parallel for
  • saxpy:依旧使用tbb parallel for
  • sqrtdot:使用tbb parallel reduce
  • minvalue:使用tbb parallel reuce
  • magicfilter: 使用tbb parallel for 和 锁实现
  • scanner:使用tbb parallel scan实现

@jinjiwu jinjiwu marked this pull request as ready for review January 22, 2022 06:29
@jinjiwu jinjiwu changed the title tbb ray6899 tbb Jan 22, 2022
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做的好!saxpy和magicfilter没有提升的主要原因是memory-bound了,第七课也提到了。

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2 participants