Perhaps the problem is that you used Android, and it is likely that Android's scheduler is optimized for power-saving instead of performance.
I was thinking of rooting the ARM devices and running the benchmarks on something much closer to the mainline kernel, in fact, my plan was to use Debian...
I guess I'm much more interested in single-threaded than in multithreaded results.
If a specific OS is not loading all the cores, well - that is an interesting fact to know, but it is mostly an OS software issue which will likely be fixed in the future.
Well, I never installed Windows on ARM, and I don't have any devices with such combination around me.
Also, I assume that the difference Windows vs. Linux should be minor for the type of benchmark I would like to do. The compiler would have some effect, ISA extensions perhaps even more, but the...
Wait, Geekbench does not have a CLI user inteface. Well, that's a meh. And not open source.
At least, is it any good in comparing different architectures?
Edit:
This state of things is still unsatisfactory to me. I can't find any suitable benchmarks, and the only option I have is to run...
Sorry for the misunderstanding, but such a target is not my requirement (I have just clarified this in the original post). For Windows, the only supported architectures need to be x86 32&64. I don't mind compiling the benchmark.
I can see that there are lot of proposals for Handbrake, 7-zip and...
Hello!
I was trying to find some good multiplatform CPU benchmarking programs. I want to compare some CPUs of widely different architectures.
What are your recommendations?
Obligatory conditions:
- works on Windows (x86 64-bit)
- works on Linuxes (x86 32&64, ARMv6, ARMv7, ARMv8 A32&A64)
-...
I have been programming for 20 years and I'm very well familiarized with the concept of pipeline and it's effects.
You are completely mistaken. Where did I talk about disabling branch prediction? I said: what if speculative execution is disabled. Speculative execution is not branch prediction...
Gaming is mostly bottlenecked by the GPU. Therefore, games should not be substantially affected.
The paper I referenced is apparently from year 2007. I would be surprised if the density of branch instructions changed significantly since then.
I agree that we cannot test the effects of...
As there were no replies in the past 20 hours, I'll start with my estimation.
The performance decrease would be low, about 15% on average. In some specific applications, it might go up to 30%, but that would be uncommon. In pathological cases, it might be up to 50%, but that would be extremely...
In my opinion, you are only partially right. Much of what you say is true.
As you know, this would be practically impossible to test without a special CPU microcode provided by the CPU manufacturer (which was never provided). Therefore, your "only way" is, in fact, a no-way.
But there is a big...
Here is a new topic for this thread:
What would be the average speed decrease of a modern CPU when the speculative execution feature is disabled?
Post your opinions backed up by reasons. That is, don't just say "it would be about XX% decrease", you need to explain why are you estimating approx...
Here is a more precise phrasing of the question:
What would be the average speed decrease of a modern CPU when the speculative execution feature is disabled?
Post your opinions backed up by reasons. That is, don't just say "it would be about XX% decrease", you need to explain why are you...
If you had a game which runs at 30 fps, and then you disable speculative execution and get 1 fps, then I'll agree with you.
The question is then: what's the amount of slowdown that would be caused by disabling speculative execution.
But that is a separate question for a separate thread.
It is indisputable that performance has a huge impact on software.
But, there is a difference between saying that software"doesn't work", "works incorrectly" and "works too slowly". The third case is, in some ways, substantially different than the first two.
So, in the sense of the first two...
Recap.
Apparently, the term "Speculative Execution" isn't precisely defined. In the stricter sense, it refers to the ability of a processor to execute instructions that were not requested to be executed. If the processor later determines that the results of some speculatively executed...
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