Hi,
I'm currently using xgrid for my computations... Here is the setup:
We have multiple imac OS 10.6, a intel server with mac OS 10.5 and two
G5 mac (10.5). All of them have sage4.3 (or 4.3.1) binary build.
In order for us to make xgrid work with sage, we gave some more rights
for user "nobody". (We copied /usr/share/sandbox/
xgridagentd_task_somebody.sb over xgridagentd_task_nobody.sb. So now
xgrid can execute sage anywhere on the disk)
We created a batch job ( a .plist file) to send to xgrid. The tasks
are .sh files containing the lines:
------------------------------
#!/bin/bash
export HOME=`pwd`
/usr/local/bin/sage Script.sage
------------------------------
and Script.sage contains the line:
------------------------------
load My_module.py
Fonction(int1,int2,int3)
------------------------------
The Script.py generated file (located on the agent's disk) is then:
------------------------------
# This file was *autogenerated* from the file Script.sage.
from sage.all_cmdline import * # import sage library
_sage_const_int1 = Integer(int1); _sage_const_int2 = Integer(int2);
_sage_const_int3 = Integer(int3)
execfile("My_module.py")
Fonction(_sage_const_int1 ,_sage_const_int2 ,_sage_const_int3 )
------------------------------
Now, we send the batch job to xgrid. The intel server does everything
OK, so as the G5. But all the imac give the following error:
WARNING: There is one major unsolved bug in some versions of
Sage on OS X 10.6 that causes an 'Abort trap' crash when
doing certain symbolic computations.
See http://trac.sagemath.org/sage_trac/ticket/7095/.
Setting permissions of DOT_SAGE directory so only you can read and
write it.
Traceback (most recent call last):
File "Script.py", line 2, in <module>
from sage.all_cmdline import * # import sage library
File "/Library/sage/local/lib/python2.6/site-packages/sage/
all_cmdline.py", line 14, in <module>
from sage.all import *
File "/Library/sage/local/lib/python2.6/site-packages/sage/all.py",
line 64, in <module>
from sage.misc.all import * # takes a while
File "/Library/sage/local/lib/python2.6/site-packages/sage/misc/
all.py", line 70, in <module>
from sage_input import sage_input
File "/Library/sage/local/lib/python2.6/site-packages/sage/misc/
sage_input.py", line 163, in <module>
from sage.misc.functional import parent
File "/Library/sage/local/lib/python2.6/site-packages/sage/misc/
functional.py", line 37, in <module>
from sage.rings.complex_double import CDF
File "complex_double.pyx", line 88, in init
sage.rings.complex_double (sage/rings/complex_double.c:13660)
File "/Library/sage/local/lib/python2.6/site-packages/sage/rings/
complex_field.py", line 86, in ComplexField
C = ComplexField_class(prec)
File "/Library/sage/local/lib/python2.6/site-packages/sage/rings/
complex_field.py", line 177, in __init__
self._populate_coercion_lists_(coerce_list=[complex_number.RRtoCC
(self._real_field(), self)])
File "complex_number.pyx", line 2003, in
sage.rings.complex_number.RRtoCC.__init__ (sage/rings/complex_number.c:
12936)
File "map.pyx", line 41, in sage.categories.map.Map.__init__ (sage/
categories/map.c:1962)
File "/Library/sage/local/lib/python2.6/site-packages/sage/
categories/homset.py", line 152, in Hom
H = category.hom_category().parent_class(X, Y, category =
category)
File "/Library/sage/local/lib/python2.6/site-packages/sage/
categories/rings.py", line 117, in __new__
from sage.rings.homset import RingHomset
File "/Library/sage/local/lib/python2.6/site-packages/sage/rings/
homset.py", line 17, in <module>
import quotient_ring
File "/Library/sage/local/lib/python2.6/site-packages/sage/rings/
quotient_ring.py", line 32, in <module>
import sage.rings.polynomial.multi_polynomial_ideal
File "/Library/sage/local/lib/python2.6/site-packages/sage/rings/
polynomial/multi_polynomial_ideal.py", line 229, in <module>
from sage.interfaces.all import (singular as singular_default,
File "/Library/sage/local/lib/python2.6/site-packages/sage/
interfaces/all.py", line 8, in <module>
from gap import gap, gap_reset_workspace, gap_console,
gap_version, is_GapElement, Gap
File "/Library/sage/local/lib/python2.6/site-packages/sage/
interfaces/gap.py", line 987, in <module>
gap_reset_workspace(verbose=False)
File "/Library/sage/local/lib/python2.6/site-packages/sage/
interfaces/gap.py", line 978, in gap_reset_workspace
g.eval('SaveWorkspace("%s");'%WORKSPACE)
File "/Library/sage/local/lib/python2.6/site-packages/sage/
interfaces/gap.py", line 480, in eval
result = Expect.eval(self, input_line, **kwds)
File "/Library/sage/local/lib/python2.6/site-packages/sage/
interfaces/expect.py", line 983, in eval
return '\n'.join([self._eval_line(L, **kwds) for L in code.split
('\n') if L != ''])
File "/Library/sage/local/lib/python2.6/site-packages/sage/
interfaces/gap.py", line 685, in _eval_line
self._start()
File "/Library/sage/local/lib/python2.6/site-packages/sage/
interfaces/gap.py", line 362, in _start
raise RuntimeError, msg
RuntimeError: Unable to start gap because the command 'gap -r -b -p -T
-o 9999G /Library/sage/data//extcode/gap/sage.g' failed.
Moreover, the same machine did give me the same error for the same
computation (for different inputs), but the last line is simply:
RuntimeError: Unable to start gap
As the python command appears to be runned by user "nobody", I guess
the problem is the difference between the rights of nobody in 10.6 and
10.5...
My computation are considerably slowed down by this bug and I would be
very happy to find a solution! Help! If you need more info, let me
know!
Thanks!
J-P Labbé
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