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为什么dispatch_async放在for循环效率会变那么高 #5

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PhilCai1993 opened this issue Apr 25, 2016 · 3 comments
Open

为什么dispatch_async放在for循环效率会变那么高 #5

PhilCai1993 opened this issue Apr 25, 2016 · 3 comments

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@PhilCai1993
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@jasonhotsauce
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因为for循环中所需要执行的任务都dispatch到后台执行了，所以每次循环都是立刻返回。
这里还可以用dispatch_apply来代替，更加明了一些。@ChenYilong

@PhilCai1993
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@jasonhotsauce 做 dispatch_async这个操作不会很耗时咯？

@jasonhotsauce
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jasonhotsauce commented Jun 22, 2016 •
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做 dispatch_async这个操作不会很耗时咯？

这个要相对的来看，一般来说是不太影响performance的，但是如果滥用的话，也会有问题。

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@jasonhotsauce @PhilCai1993