On Jan 15, 2009, at 4:39 PM, William Stein wrote:
> On Thu, Jan 15, 2009 at 4:21 PM, Robert Bradshaw
> <[email protected]> wrote:
>>
>> On Jan 15, 2009, at 4:10 PM, [email protected] wrote:
>>
>>> That's interesting because I calculated M37 = 2^3021377-1 (909526
>>> digits) on a 2.6 GHz pentium 4 using my own C++ class to represent
>>> large ints and it about 2 hours.
>>>
>>> I calculated the same thing on www.sagenb.org and it took about 6
>>> minutes!
>>
>> Yeah, sagenb.org can get pretty loaded down some times.
>
> He was saying that "6 minutes" was very very fast, not slow.
I was comparing it to what times I would have expected to see based
on my local timings. The online notebook sometimes felt sluggish to
me, but I do almost everything locally so it's not a fair comparison
(and I only occasionally use it, probably less than a dozen times
since we moved it off the old hardware).
> [[his
> timing turns
> out to really have been of printing out the answer via the notebook.
> better would be to do
> sage: time s = 2^3021377-1
> CPU time: 0.00 s, Wall time: 0.00 s
> sage: time open('output.txt','w').write(str(s))
> CPU time: 0.70 s, Wall time: 0.70 s
>
> which gives a link to a file that you can download that contains
> the answer.]]
Yep, that was my diagnosis of the 6 minutes too. Or perhaps as
mentioned it was a different Mersenne prime that we're talking about,
but in any case it's a big answer to try and display in a browser.
- Robert
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