Using parfor
4 次查看(过去 30 天)
显示 更早的评论
Hi I successfully implemented a parfor loop in Matlab. However on my computer which has 4 cores I am not getting the improvement in computation time I expected to get. When I go to the task manager and check the CPU usage it rarely goes over 25% which is the same as before the parfor loop What could be the problem?
0 个评论
采纳的回答
Thomas
2012-4-27
What kind of problem have you set up using parfor.. a general fact about the Parallel Computing Toolbox is that the parallel tasks have to be pretty intensive/expensive in order for parallelization be effective..
If your computation is trivial then you might not get the speedup you expect.. Not a lot more can be said without looking at what code you have parallelized.
Also, is your machine quad core or a two core hyperthreaded which would show up as 4 virtual cores?
更多回答(1 个)
Edric Ellis
2012-5-2
One thing to check - have you opened MATLABPOOL before issuing PARFOR? You need to do this in each MATLAB session to make the extra workers available. I.e.
matlabpool open local 4
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Parallel for-Loops (parfor) 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!