Re: [isabelle] Creating ML data is slow. No sharing/caching?

Sorry for the noise, I'm wrong. -cheers chris

On 07/28/2015 08:27 PM, Christian Sternagel wrote:
Dear Cornelius,

isn't the problem merely that the expression

   "fold And (map Prim [1..10]) (Prim 0)"

is evaluated 1000 times? I guess you could speed-up things by using
something like:

   "let e = fold And (map Prim [1..10]) (Prim 0) in add_expr e (map Prim

I did not yet test my intuition though.



On 07/28/2015 08:13 PM, C. Diekmann wrote:

4) Adding bigger expressions to a list of expressions is more than 10
times slower than (2):
value[code] "add_expr (fold And (map Prim [1..10]) (Prim 0)) (map Prim
[1..1000])" (*5.853s elapsed time, 11.495s cpu time, 0.316s GC time*)

Why is (4) so slow, compared to (2)?

How can I speed this up? Currently, this renders my theory unusable.

Doesn't ML use sharing or caching? I always assumed that, if I have
expressions e1 and e2, then constructing "And e1 e2" would reuse the
values e1 and e2 and this operation would be independent of the sizes
of e1 and e2.


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