Post your result for this prime python script.

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#2648903 7-Feb-2021 11:16

zenourn:

I suspect this isn't the best of benchmarks.

Nar its just a bit of fun mucking around.

Interesting to see your results guys thanks for trying it out 😀

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SirHumphreyAppleby

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#2648908 7-Feb-2021 11:30

I was interested in seeing how fast this was on an APU2, but I don't have Python installed on those. Here's a Raspberry Pi 3 Model B Plus Rev 1.3 instead...

Find all primes up to: 200000 using 16 processes.
Time elapsed: 517.57 seconds
Number of primes found 17984

JaseNZ

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#2648915 7-Feb-2021 11:47

I actually wanted to try this after watching this. Was an interesting watch.

https://www.youtube.com/watch?v=hGyJTcdfR1E&t

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Gordy7

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#2648920 7-Feb-2021 12:22

i7 7700K (CPU running at 4.49 GHz during Prime test)

Loaded Python 3.9 and ran script.

Find all primes up to: 200000 using 32 processes.
Time elapsed: 23.83 seconds
Number of primes found 17984

After a reboot

Find all primes up to: 200000 using 32 processes.
Time elapsed: 15.74 seconds
Number of primes found 17984

Gordy

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maslink

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#2648978 7-Feb-2021 14:15

MacBook Pro (2016) - i7-6700HQ @ 2.6 GHz

Find all primes up to: 200000 using 32 processes.
Time elapsed: 37.9 seconds
Number of primes found 17984

Raspberry Pi400 @ 2GHz

Find all primes up to: 200000 using 16 processes.
Time elapsed: 164.48 seconds
Number of primes found 17984

Mehrts

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#2648982 7-Feb-2021 14:37

Since results for a RPi 3B+ have been posted, I thought I'd dig out a RPi 4B (4GB RAM) running a fresh install of RaspPiOS & stock CPU speeds.

Find all primes up to: 20000 using 16 processes.
Time elapsed: 183.29 seconds
Number of primes found 17984

Not a bad performance boost from the previous gen RPi. These wee things are really packing a punch now.

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#2649043 7-Feb-2021 18:09

Comparing an 8700k PC with Apples new M1 Macbook Pro:

Both running Python 3.91

8700k 16gb 256gb EVO SSD:

Find all primes up to: 200000 using 24 processes.
Time elapsed: 11.6 seconds
Number of primes found 17984

M1 Macbook Pro 16gb:

Find all primes up to: 200000 using 32 processes
Time elapsed: 12.23 seconds
Number of primes found 17984

Paul (1st post)

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#2649129 7-Feb-2021 19:13

This was my 2018 Macbook pro core i7

Jasons-MacBook-Pro:Documents jason$ python3 prime2.py

Find all primes up to: 200000 using 48 processes.

Time elapsed: 22.41 seconds

Number of primes found 17984

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nzkc

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#2649191 7-Feb-2021 19:58

My Ryzen 5 1600 rig built some time ago and running a bunch of VMs:

Find all primes up to: 200000 using 48 processes.
Time elapsed: 12.79 seconds
Number of primes found 17984

Edit:

And a Huawei Matebook D15 with a Ryzen 3500U:

Find all primes up to: 200000 using 32 processes.
Time elapsed: 22.26 seconds
Number of primes found 17984

I expected those to be closer TBH. The first one runs Linux, the second Windows. Guess thats the difference between a desktop and mobile CPU!

sJBs

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#2649199 7-Feb-2021 20:13

python test.py
Find all primes up to: 200000 using 32 processes.
Time elapsed: 75.0 seconds
Number of primes found 17984

Python 2.7.17 (default, Sep 30 2020, 13:38:04)
[GCC 7.5.0] on linux2

Intel i7-3820 from 2012.

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TheoM

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#2649207 7-Feb-2021 20:40

% python3 prime2.py
Find all primes up to: 200000 using 96 processes.
Time elapsed: 5.65 seconds
Number of primes found 17984

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SirHumphreyAppleby

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#2649210 7-Feb-2021 20:48

I was curious to see how Python compared to C. I used TinyCC as a comparison, including the compile and execution time. The C programme ran for 2.38 seconds, versus 21.59 seconds for the Python. Adding what appears to be deliberate inefficiencies in the Python code to the C version (checking all candidate numbers, not just odd numbers, and all lower numbers as divisors), the run time for the C version is 5.15 seconds. Python is only three times slower (although the C code is single threaded). I'd consider that pretty good.

#define max_number 200000

int is_prime(int candidate_number)
{
       int divisor;
       int divisor_end;
       int found_prime;

       found_prime = 1;
       for(divisor = 2, divisor_end = candidate_number / 2; found_prime && divisor <= divisor_end; divisor++) {
               if(candidate_number % divisor == 0) found_prime = 0;
       }
       return found_prime;
}

int main()
{
       int num_primes;
       int candidate_number;

       for(num_primes = 1, candidate_number = 3; candidate_number < max_number; candidate_number += 2) {
               if(is_prime(candidate_number)) num_primes++;
       }
       printf("Number of primes found %d\n", num_primes);
       return 0;
}

ANglEAUT

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#2649257 7-Feb-2021 23:46

sJBs: ... Time elapsed: 75.0 seconds
...
Intel i7-3820 from 2012.

Interesting. My 8 core i7-3770 CPU @ 3.40GHz did

$ python find-prime_multicore.py (fixed script)
Find all primes up to: 200000 using 32 processes.
Time elapsed: 121.91 seconds
Number of primes found 17984

$ python find-prime_singlecore.py (original script)
Find all primes up to: 200000 using 32 processes.
Time elapsed: 202.8 seconds
Number of primes found 17984

I wonder how much closer I could get with a clean reboot?

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ANglEAUT

altered-ego
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#2649259 7-Feb-2021 23:56

SirHumphreyAppleby:

Here's a Raspberry Pi 3 Model B Plus Rev 1.3 instead...
Time elapsed: 517.57 seconds

Mehrts:

I thought I'd dig out a RPi 4B (4GB RAM)
Time elapsed: 183.29 seconds

Raspberry Pi 4 Model B Rev 1.4 (4 core Cortex-A72 / 8GB RAM)

$ python3 find-prime_multicore.py
Find all primes up to: 200000 using 16 processes.
Time elapsed: 82.66 seconds
Number of primes found 17984

$ python3 find-prime_singlecore.py
Find all primes up to: 200000 using 16 processes.
Time elapsed: 298.08 seconds
Number of primes found 17984

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zenourn

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#2649367 8-Feb-2021 11:05

I usually run number crunching Python code these days with pypy, and it does give a reasonable improvement:

$python3 prime.py
Find all primes up to: 200000 using 256 processes.
Time elapsed: 3.01 seconds
Number of primes found 17984

$ pypy prime.py
Find all primes up to: 200000 using 256 processes.
Time elapsed: 1.21 seconds
Number of primes found 17984

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