Python Speed
04-21-2021, 07:34 AM (This post was last modified: 04-21-2021 07:39 AM by toml_12953.)
Post: #1
 toml_12953 Senior Member Posts: 1,949 Joined: Dec 2013
Python Speed
The new Python interpreter graphics are fast!

I ran three programs to draw a green hat, Here are the runtimes:

HPPL: 7.793 sec
CAS with Python syntax: 25.436 sec
Python (Apr 16 Beta): 0.926 sec

Here's the Python version:
Code:
#PYTHON EXPORT pyhat from hpprime import * from math import * t0 = eval("ticks()") # Save the current clock count for timing program # Clear screen fillrect(0,0,0,320,240,0,0) # Start program proper p=160; q=120 xp=144; xr=1.5*3.1415927 yp=56; yr=1; zp=64 xf=xr/xp; yf=yp/yr; zf=xr/zp for zi in range(-q,q+1):   if zi>=-zp and zi<=zp:     zt=zi*xp/zp; zz=zi     xl=int(.5+sqrt(xp*xp-zt*zt))     # Draw one cross-section of figure     for xi in range(-xl,xl+1):       xt=sqrt(xi*xi+zt*zt)*xf; xx=xi       yy=(sin(xt)+.4*sin(3*xt))*yf       x1=xx+zz+p       y1=yy-zz+q       pixon(0,x1,230-y1,65280)       if y1!=0:         line(0,x1,230-y1+1,x1,230,0) # Erase points below current point t = eval("ticks()")-t0 # Wait for key and print elapsed time eval("wait()") t = t/1000 print(t," seconds") #end

Tom L
Cui bono?
04-21-2021, 12:05 PM
Post: #2
 robmio Member Posts: 164 Joined: Jan 2020
RE: Python Speed
Incredible! How was this speed test done? Did you use the emulator? Have you used the HP PRIME G2?
04-21-2021, 01:46 PM
Post: #3
 toml_12953 Senior Member Posts: 1,949 Joined: Dec 2013
RE: Python Speed
(04-21-2021 12:05 PM)robmio Wrote:  Incredible! How was this speed test done? Did you use the emulator? Have you used the HP PRIME G2?

All times were measured on a G2.

Tom L
Cui bono?
04-21-2021, 03:14 PM
Post: #4
 robve Senior Member Posts: 360 Joined: Sep 2020
RE: Python Speed
(04-21-2021 07:34 AM)toml_12953 Wrote:  The new Python interpreter graphics are fast!

I ran three programs to draw a green hat, Here are the runtimes:

HPPL: 7.793 sec
CAS with Python syntax: 25.436 sec
Python (Apr 16 Beta): 0.926 sec

Very nice. My PRIME G2 takes even a bit longer, about 8.2 seconds to run the HPPL program.

I've used the following code, which I've translated to HPPL from the CAS Python code:

Code:
EXPORT pyhat() BEGIN   LOCAL XP,XR,YP,YR,ZP,XI;   LOCAL XF,YF,ZF,ZI,ZT,ZZ;   LOCAL XL,XT,XX,YY,X1,Y1;   T:=TICKS; // Save the current clock count for timing program   // Black out background   rect_p(0,0,320,240,rgb(0,0,0));   // Start program proper   P:=160; Q:=120;   XP:=144; XR:=1.5*3.1415927;   YP:=56; YR:=1; ZP:=64;   XF:=XR/XP; YF:=YP/YR; ZF:=XR/ZP;   FOR ZI FROM -Q TO Q DO     IF ZI>=-ZP AND ZI<=ZP THEN       ZT:=ZI*XP/ZP; ZZ:=ZI;       XL:=int(.5+sqrt(XP*XP-ZT*ZT));       // Draw one cross-section of figure       FOR XI FROM -XL TO XL DO         XT:=sqrt(XI*XI+ZT*ZT)*XF; XX=XI;         YY:=(sin(XT)+.4*sin(3*XT))*YF;         X1:=XX+ZZ+P;         Y1:=YY-ZZ+Q;         pixon_p(X1,230-Y1,rgb(0,255,0));         IF Y1!=0 THEN           Line_p(X1,230-Y1+1,X1,230); // Erase points below current point         END;       END;     END;   END;   T:=TICKS-T;   // Wait for key and print elapsed time   FREEZE;   PRINT((T/1000)+" seconds"); END;

Not sure if the PRIME Python graphics library internals are any different. The Python interpreter presumably uses the hardware floating point support of the Cortex-A7. The fp performance of Python on the HP PRIME is incredibly good: https://tiplanet.org/forum/viewtopic.php...518#HPPPY5 (translated in English with Google translate):

"The HP Prime are really extraordinary in floating point calculation Python and the HP Prime G2 even crushes all competition with its omnipotence, even by doping the latter with overclocking! Both among the solutionsPython official and solutions Python compatible with exam mode, HP Prime G2 is clearly the most powerful either in integer or in floating point calculus, and by far, congratulations!"

Even faster than "doping the competition with overclocking"...

- Rob

"I count on old friends" -- HP 71B,Prime|Ti VOY200,Nspire CXII CAS|Casio fx-CG50...|Sharp PC-G850,E500,2500,1500,14xx,13xx,12xx...
04-21-2021, 05:10 PM
Post: #5
 Xorand Member Posts: 76 Joined: Feb 2015
RE: Python Speed
That's blindingly fast.

As a point of comparison, I adapted your python program to run on my TI Nspire CX II CAS under its native python.

The program took 215.98 seconds (yes, 3.5 minutes) to draw the hat.

I optimized it slightly by doing all the drawing in a buffer and displaying the final product when done. That reduced time to 82.25 seconds.

Looks like the HP Prime python is very well optimized.
04-22-2021, 06:26 PM
Post: #6
 toml_12953 Senior Member Posts: 1,949 Joined: Dec 2013
RE: Python Speed
Changing

Code:
pixon(0,x1,230-y1,65280)

to

Code:
pixon(0,x1,230-y1,eval("rgb(0,255,0)"))

made the runtime go from 0.92 seconds to 4.37 seconds!

Tom L
Cui bono?
04-22-2021, 06:41 PM
Post: #7
 Guenter Schink Senior Member Posts: 486 Joined: Dec 2013
RE: Python Speed
Although I think that the "Summation based benchmark for calculators " is of limited value, I thought I give it a try. Look here for the results - impressive.

Günter
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