I mean in multithreaded environment, do people share same cache (and same
symbols)
If person1 created x=Symbol('x') and this is cached, and person2 created
x=Symbol('x', positive=True), do they have separate x's or they mixed, so
person1 can get positive x if it was overwritten in cache by person 2?
Reproduction.
from sympy import *
x = Symbol('x')
f = log(x)
a=Wild('a')
symbols = f.free_symbols
for symbol in symbols:
f = f.subs(symbol, sympy.Symbol(symbol.name, positive=True))
print f.replace(log(a),log(Abs(a))) # prints log(x) as expected
# clear_cache() solves the problem
symbols = f.free_symbols
for symbol in symbols:
f = f.subs(symbol, sympy.Symbol(symbol.name))
print f.replace(log(a),log(Abs(a))) # OOPS! prints log(x) instead of
log(|x|)
On Wednesday, February 25, 2015 at 6:38:12 PM UTC+2, Joachim Durchholz
wrote:
>
> Am 25.02.2015 um 17:04 schrieb Paul Royik:
> > It appeared, that problem is with cache.
> > Clearing cache solves the problem.
> >
> > Now, I want to ask, how cache is working in multithreaded environment?
> > Do all people share same cache?
>
> Actually I wouldn't expect caching to affect the outcome: at worst, the
> same cache entry is computed twice, with the second entry overwriting
> the first, identical entry.
>
> Can you reproduce the problem in a single-threaded environment, with
> caching enabled?
>
--
You received this message because you are subscribed to the Google Groups
"sympy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sympy.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sympy/513c22d4-d835-403e-9b2a-e9a1ec640f82%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
