Fill CPU cache with NOPs
Hello!
For benchmarking purposes, I would like to fulfull the CPU's cache with nops, before executing the actual code.The solution I've implemented uses macroses: https://ideone.com/2f3sIq
It should work, but the problem, that it takes ~1200ms for a compiler to compile it. Isn't there any better way?
For benchmarking purposes, I would like to fulfull the CPU's cache with nops, before executing the actual code.The solution I've implemented uses macroses: https://ideone.com/2f3sIq
It should work, but the problem, that it takes ~1200ms for a compiler to compile it. Isn't there any better way?
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I see the dissambly here and in Visual Studio. Looks to be pretty fair:
https://godbolt.org/z/hEO6Ug
Also, I measure the run-time and see, that it's increasing proportionally to the amount of nops I'm adding. Even in the release mode.
https://godbolt.org/z/hEO6Ug
Also, I measure the run-time and see, that it's increasing proportionally to the amount of nops I'm adding. Even in the release mode.
So what is a cache full of NOPs as opposed to say your usual run of the mill arithmetic and logical operations supposed to prove to you?
| It should work, but the problem, that it takes ~1200ms for a compiler to compile it. Isn't there any better way? |
Make sure it's in a file by itself so you only have to compile it once.
It takes less than a second to compile for me, but may I ask what is wrong with taking 1.2s to compile something?
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