Parallel Interface to the Sage interpreter#

This is an expect interface to emph{multiple} copy of the sage interpreter, which can all run simultaneous calculations. A PSage object does not work as well as the usual Sage object, but does have the great property that when you construct an object in a PSage you get back a prompt immediately. All objects constructed for that PSage print <<currently executing code>> until code execution completes, when they print as normal.

note{BUG – currently non-idle PSage subprocesses do not stop when sage exits. I would very much like to fix this but don’t know how.}

EXAMPLES:

We illustrate how to factor 3 integers in parallel. First start up 3 parallel Sage interfaces:

sage: v = [PSage() for _ in range(3)]

>>> from sage.all import *
>>> v = [PSage() for _ in range(Integer(3))]

Next, request factorization of one random integer in each copy.

sage: w = [x('factor(2^%s-1)'% randint(250,310)) for x in v]  # long time (5s on sage.math, 2011)

>>> from sage.all import *
>>> w = [x('factor(2^%s-1)'% randint(Integer(250),Integer(310))) for x in v]  # long time (5s on sage.math, 2011)

Print the status:

sage: w       # long time, random output (depends on timing)
[3 * 11 * 31^2 * 311 * 11161 * 11471 * 73471 * 715827883 * 2147483647 * 4649919401 * 18158209813151 * 5947603221397891 * 29126056043168521,
 <<currently executing code>>,
 9623 * 68492481833 * 23579543011798993222850893929565870383844167873851502677311057483194673]

>>> from sage.all import *
>>> w       # long time, random output (depends on timing)
[3 * 11 * 31^2 * 311 * 11161 * 11471 * 73471 * 715827883 * 2147483647 * 4649919401 * 18158209813151 * 5947603221397891 * 29126056043168521,
 <<currently executing code>>,
 9623 * 68492481833 * 23579543011798993222850893929565870383844167873851502677311057483194673]

Note that at the point when we printed two of the factorizations had finished but a third one hadn’t. A few seconds later all three have finished:

sage: w       # long time, random output
[3 * 11 * 31^2 * 311 * 11161 * 11471 * 73471 * 715827883 * 2147483647 * 4649919401 * 18158209813151 * 5947603221397891 * 29126056043168521,
 23^2 * 47 * 89 * 178481 * 4103188409 * 199957736328435366769577 * 44667711762797798403039426178361,
 9623 * 68492481833 * 23579543011798993222850893929565870383844167873851502677311057483194673]

>>> from sage.all import *
>>> w       # long time, random output
[3 * 11 * 31^2 * 311 * 11161 * 11471 * 73471 * 715827883 * 2147483647 * 4649919401 * 18158209813151 * 5947603221397891 * 29126056043168521,
 23^2 * 47 * 89 * 178481 * 4103188409 * 199957736328435366769577 * 44667711762797798403039426178361,
 9623 * 68492481833 * 23579543011798993222850893929565870383844167873851502677311057483194673]
class sage.interfaces.psage.PSage(**kwds)[source]#

Bases: Sage

eval(x, strip=True, **kwds)[source]#

INPUT:

  • x – code

  • strip –ignored

get(var)[source]#

Get the value of the variable var.

is_locked()[source]#
set(var, value)[source]#

Set the variable var to the given value.

class sage.interfaces.psage.PSageElement(parent, value, is_name=False, name=None)[source]#

Bases: SageElement

is_locked()[source]#