Is hosting on 5GHz processors realistic?

Question

System administration

I ordered VDS hosting from timeweb on a tariff with 5GHz + ispmanager, using commands in the console, after connecting via ssh, it shows 3.6 GHz.
I ask those. support, how to achieve a constant frequency of 5GHz, as stated in the tariff? And they answer that these tariffs always have a frequency of 5 GHz.
I wonder where is the truth? Maybe there are commands that will show exactly at what frequency the VDS server is running?
CentOS7+Ispmanger.

Answer 1

For a very long time, the concept of "processor running at a constant frequency" no longer exists. This value is dynamic at the discretion of the processor itself. The maximum that remains available - you can ask for a more or less aggressive energy saving policy. And the frequency will still be controlled by the processor itself.
A CPU with a base frequency of 5 GHz is corny not represented by serial ones, but Turbo Boost or analogues - they do not have a constant frequency. CPU loaded? The CPU resets the frequency to keep within the specified heat dissipation or to avoid overheating. CPU not loaded? We lower the frequency to a minimum until the de-energization of some of the cores. The CPU is moderately loaded - ok, we will increase the frequency beyond as much as the CPU itself wants. The CPU is loaded with short bursts (that is, a typical load from the web, back end, database side) - oh well, increase the frequency, the processor thinks. And it doesn't increase.

Answer 2

Here's the truth.
We are conducting an experiment, an old e3-1265v2 is on the host machine, but it doesn’t matter. We have 4 cores, 8 threads, base frequency 2.5, ceiling 3.5 in turbo boost.

watch grep \"cpu MHz\" /proc/cpuinfo

We get that the values ​​change over time in a wide range.

cpu MHz : 1800.000
cpu MHz : 2100.000
cpu MHz : 1889.419
cpu MHz : 1700.000
cpu MHz : 1800.000
cpu MHz : 1800.000
cpu MHz : 1700.000
cpu MHz : 1700.000

We do the same in the guest and see the base frequency of the CPU.

cpu MHz : 2494.332
cpu MHz : 2494.332

Separately, I want to note, if you naively believe that by choosing a tariff for 350r from this hoster where they promise 2x5GHz, this does not happen. Two honestly sawn cores will cost one zero more. Even worse, this is if the hoster is honest, otherwise you will just get shares higher than on other tariffs, and in fact, as the rest were threshed on your cores, they will continue. They just won't tell you about it.