Dear list!
I stumbled upon a problem and I was wondering if someone would by so
kind and explain to me what is going on.
The problem is sorting 2 000 000 points by `x` coordinate:
from random import random
from time import time
class point(object):
def __init__(self, x, y):
self.x, self.y = x, y
data = [point(random(), random()) for i in range(2000000)]
t = time()
data.sort(key=lambda p:p.x)
print time() - t
on my machine in runs 8.74s under PyPy 5.4.1 on MacOS. I then try to
sort the points in JavaScript:
var data = [];
for (var i=0; i<2000000; i++) {
data.push({x:Math.random(), y:Math.random()});
}
console.time('sorting');
data.sort(function(a, b) { return a.x - b.x; });
console.timeEnd('sorting');
and it runs in 3.09s under V8 5.3.
I was just wondering, why is it nearly 3x slower under PyPy than it is
under V8? Is there any way I could make the code run faster?
Thank you in advance!
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