Python Driver for GGNFS and MSIEVE

[Brian Gladman]

Hi Everyone,

I have now published my initial version of a Python driver for GGNFS and MSIEVE. It is available here:

http://gladman.plushost.co.uk/oldsit.../factoring.php

It has been developed on Windows and will probably need a bit of work to get it working on Linux. Also, while the main operation has been tested by myself and Jeff Gilchrist, some of the less used features still need testing.

Jeff has kindly modified his guide here:

http://gilchrist.ca/jeff/factoring/n...ers_guide.html

to describe how factmsieve.py can be used.

Bear in mind that it is new and will contain bugs. I would be most grateful for feedback on bugs and suggestions for improvement.

In broad terms it duplicates the functions of factmsieve.pl but can also use MSIEVE for polynomial selection.

I would like to thank Jeff Gilchrist for the extensive help he has given during its development.

best regards,

Brian Gladman

[Jeff Gilchrist]

A couple of nice features that this python driver has over the
factmsieve.pl perl script besides a lot of the bugs that Brian fixed
is: clean stopping and re-starting, plus it supports doing polynomial
selection with msieve (default) and pol51 whichever you prefer. It
also accepts reading in msieve polynomial files (.fb) so you don't
need to worry about converting them from msieve to ggnfs format to use
with the script. So now you can easily do an msieve -> ggnfs ->
msieve factoring.

Great work Brian!

Jeff.

[dekcarki]

'SAVEPAIRS = True'

compressing spairs.out to spairs.save.gz
Traceback (most recent call last):
File "../factmsieve.py", line 1928, in <module>
run_siever(CLIENT_ID, NUM_THREADS, fact_p, lats_p)
File "../factmsieve.py", line 1659, in run_siever
gzip_f('spairs.out', 'spairs.save.gz')
File "../factmsieve.py", line 214, in gzip_f
with gzip.open(to, 'wb') as out_file:
AttributeError: GzipFile instance has no attribute '__exit__'

'SAVEPAIRS = False' runs without problems
system: Debian/sid - sidux, python2.6 from experimental

[mdettweiler]

When I try to run this on Windows XP/cygwin with python 2.5.2, I get:

factmsieve.py:188: Warning: 'with' will become a reserved keyword in Python 2.6
  File "factmsieve.py", line 188
    with open(file_path, 'r') as in_file:
            ^
SyntaxError: invalid syntax

[dekcarki]

Originally Posted by mdettweiler

When I try to run this on Windows XP/cygwin with python 2.5.2

from http://gladman.plushost.co.uk/oldsit...factoring.php:

This program, which needs either Python 2.6 or 3.1 ...

[Brian Gladman]

Originally Posted by dekcarki

'SAVEPAIRS = True'
'SAVEPAIRS = False' runs without problems
system: Debian/sid - sidux, python2.6 from experimental

Hi

It looks like your distribution's gzip module can't handle the 'with' contexts that I use in the gzip subroutine:

    with open(fr, 'rb') as in_file:
      with gzip.open(to, 'wb') as out_file:
        out_file.writelines(in_file)

You could try:

    with open(fr, 'rb') as in_file:
      out_file = gzip.open(to, 'wb')
      out_file.writelines(in_file)
      out_file.close()

Python uses indentation for defining blocks - the last three lines need to be indented when compared with the first (forum posting didn't preserve my indents :-()
code tags added in moderation

Thanks for trying the program and reporting this.

Brian Gladman

[mataje]

It works great.
Thank you Brian and Jeff.

[Brian Gladman]

Originally Posted by mataje

It works great.
Thank you Brian and Jeff.

Hi Guys,

Thanks for the feedback.

If it works (or fails) it would help if you could specify the environment in which you have tested it.

Brian

[smh]

Originally Posted by Brian Gladman

Python uses indentation for defining blocks - the last three lines need to be indented when compared with the first (forum posting didn't preserve my indents :-()

Thats what the [ CODE] tags are for.

[mataje]

Originally Posted by Brian Gladman

Hi Guys,

Thanks for the feedback.

If it works (or fails) it would help if you could specify the environment in which you have tested it.

Brian

Windows Vista 32 bits. Tomorrow I will try on Windows 7 64 bits.

[Brian Gladman]

Originally Posted by mataje

Windows Vista 32 bits. Tomorrow I will try on Windows 7 64 bits.

Thanks - it should work on Windows 7 x64 as that is what I am using for its development.

I can also confirm that the modification I gave above for the gzip issue is generally necessary.

Brian