Hi William,
Thank you for all the information. I have spent time this morning
going through it all, the alarm thing is really useful ~ I also
discovered Ctl-C, which seems to be quite handy! (I am REALLY new to
this! John had shown me, but I forgot.)
> * check out the @parallel decorator (note that you can't pickle and
> send elliptic curves with @parallel due to some unresolved issue
> involving forking an pari, so just send their Cremona label instead).
I've had a look at this, I'm not very sure of what it's doing; is it
just allowing one to apply a function repetitively to all the elements
of a list?
The thing I thought I could try is:
from sage.databases.cremona import LargeCremonaDatabase
database = CremonaDatabase().list(range(1, N))
# This list function returns all the elliptic curves in the database
with conductors in the list given. I'd like to have N = 130001 in
order to do it all at once, but it might be better to do it in stages.
old = [E.isogeny_class()[0] for E in database] # takes 14 seconds
for N=50
new = [E.isogeny_class_new()[0] for E in database]
# "old" and "new" are both lists of lists
i = 0
while i<len(database): # or, better, give a number
old = old[i]
old.sort()
new = new[i]
new.sort()
try:
new == old
except Exception, msg:
record_failure(msg)
i = i+1
Is this a horrendously convoluted way of doing it?
My other remaining problem is how to run the test on another core(s)
while I get on with other things. I found a thing called dsage; would
that be the thing to use?
Many thanks once again,
Jenny
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