Which is generally more efficient between locking a mutex and doing disk reads in C++?
如果它取决于Im的运行系统,那么检查这一系统会有什么好办法? 做100万个锁点和100万个磁盘读成吗?
Generally, the mutex operations would be far faster than disk reads. That s because their intended purpose requires maximum speed. In fact, I would hazard to suggest that any memory operation is likely to be faster than a disk one.
Of course, there may be bizarre edge cases where the disk information is cached in memory and you read the same byte over and over but that s not really doing a disk read, is it?
If you find yourself with a desire to check this (and I would suggest it s not really necessary), simply code up a couple of programs, the first which locks and unlocks a mutex a million times, the second which reads a million different pieces of information off the disk.
追踪和比较。 如果按一些荒谬因素,磁盘能够更快地回来,显示你的代码,我们解释你错了什么。
见far。 RAM+CPU比最快的SSD更快。
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