+1 for using standard and efficient libraries instead of slow and buggy sage implementations :-)
Thanks Vincent Le 23/11/2021 à 11:26, Dima Pasechnik a écrit :
primecount is a popular C++ library of efficient procedures to compute prime_pi(x), i.e. π(x), number of prime numbers <=x, and related functions. It's an optional package now. The repo is https://github.com/kimwalisch/primecount The default Sage implementation of prime_pi is buggy, and a very tricky and old Cython code - see https://trac.sagemath.org/ticket/24960 Replacing it with the primecount implementation is the most direct way to fix it, and it also gives huge speedups. For this, primecount should be promoted from optional to standard. Primecount has a (vendored by default) dependency, a C++ library primesieve, even more popular. Many distros have primesieve as a separate package, so we'd like to split primesieve off primecount, see https://trac.sagemath.org/ticket/25009 Any objections to this ? (any objector volunteers to fix Sage's buggy prime_pi :-)) Thanks, Dima PS. in the modularization effort, the Cython interface to primecount will become a separate PyPI package, work in progress on this is on https://github.com/dimpase/primecountpy .
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