On 6/2/23 12:19, Stefan Monnier wrote:
The most recent general-purpose Intel CPU without VT-X is from 2012.
*everything* on processors that old is slow.

Actually, for many (most?) single-threaded applications, I wouldn't be
surprised if some 2010 CPUs end up within a factor 3 of the most badass
desktop you can find today.

I do Perl development and like to run my module test suites in parallel to shorten the develop-test cycle. Tuned correctly, I can keep all 8 threads busy on my quad-core Hyper-Threading processors for the majority of the run time.

These are the test platforms (all have SATA 6 Gbps SSD's and enough memory to avoid swapping):

* Dell Latitude E6520 laptop with Core i7-2720QM (Q1'11)

* Homebrew Antec tower with Intel DQ67SW desktop board and Core i7-2600S processor (Q1'11)

* Dell Precision 3630 with Xeon E-2174G (Q3'18)

I will look up the PassMark CPU Mark scores for the various processors, gather Perl module test suite run time data, and do a Power Regression analysis with LibreOffice Calc:



Here is the data table for the regression analysis:

                x               y
                CPU Mark        Test Time
                (dim)           (seconds)
Core i7-2720QM  4068            24.033
Core i7-2600S   4594            22.985
Xeon E-2174G    9712            16.544

Here is the resulting equation:

y = exp(6.779011065)*(x^-0.43266897)

Here are the predicted Test Time values for a Core i7-2600 (Q1'11) and a Core i7-13700 (Q1'23):

                x               y
                CPU Mark        Test Time
                (dim)           (seconds)
i7-2600         5330            21.461
i7-13700        38995            9.072

So, the Core i7-13700 is predicted to be faster than the Core i7-2600 by a factor of 21.461 / 9.072 = 2.366.


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