Hi,
I tried the latest Sage virtualbox appliance, it works on ubuntu 9.04, 64bit.
I then used this simple script (in a terminal) to get some idea how fast it is:
from timeit import default_timer as clock
def test1():
a = 0
t = clock()
for i in range(1, 10**6):
a += 1/i**2
t = clock() - t
print t
return a
print test1()
and then test it on my system:
$ python2.5 t.py
0.198249101639
1
and in the virtualbox:
# python a.py
2.60369110107
E.g. it's about 13x slower.
For comparison, in the virtual machine at linode.com, I get:
$ python t.py
0.25862288475
1
Then it occured to me that maybe just floating point stuff is slow, or
maybe i**2 is too big. So I modified the script:
from timeit import default_timer as clock
def test1():
a = 0
t = clock()
for i in range(1, 10**6):
if i % 2 == 0:
a += i
else:
a -= i
t = clock() - t
print t
return a
print test1()
which runs on ubuntu:
$ python2.5 t.py
0.212127923965
-500000
and in the virtualbox on the same machine:
# python a.py
0.267327070236
-500000
Which is only about 1.2x slower. So apparently virtualbox is very fast
for some things.
Ondrej
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