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Mod: finish homework #11

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LouisYZK
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@LouisYZK LouisYZK commented Jan 23, 2022

Run on (8 X 1400 MHz CPU s) 4核8线程 osx

Before After 加速比
fill: 1.23536s fill: 0.256878s 4.80
fill: 1.25023s fill: 0.264094s 4.80
saxpy: 0.048762s saxpy: 0.03981s 1.22
sqrtdot: 0.086141s sqrtdot: 0.031361s 2.74
5165.4 5792.62 x
minvalue: 0.07746s minvalue: 0.01506s 5.14
-1.11803 -1.11803 -
magicfilter: 0.426949s magicfilter: 0.183792s 2.32
55924034 55924034 -
scanner: 0.080046s scanner: 0.032603s 2.45
5.28566e+07 5.28591e+07 -

sqrtdot 结果有差异,且优化效果不理想。还没想通为啥

想通了,精度问题

tbb::parallel_for(
tbb::blocked_range<size_t>(0, std::min(x.size(), y.size())),
[&] (tbb::blocked_range<size_t> r) {
std::vector<T> tmp_vec;
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加个 tmp_vec.reserve(r.size())?

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2 participants