Hi there,
as you might know the current NTL spkg doesn't use two possible speed
improvements NTL provides:
* "make setup4" is not called. William probably disabled this, because it
takes some time during compilation. setup4 runs a couple of tests to
choose the correct implementation for a couple of low level stuff to make
NTL faster.
* "-O2" (the recommended optimization level for NTL) is not enforced in the
spkg. This might be a good idea, as the user may do it himself by setting
CFLAGS/CXXFLAGS. However, several spkgs do enforce O3 (e.g. Givaro)
I would like to have them both enabled. But there are problems:
* "make setup4" makes the SAGE compilation time longer, but I think the
juice is worth the squeeze.
* on my P4 Debian Etch system NTL's "make check" doesn't terminate (it's the
LLL code). I don't know if it is related to some funny misconfiguration
on this system (my other systems run fine) or a P4/Linux issue.
Thus, I wondered if anybody would like to try these two options and report
back if "make check" terminates. To do so:
1) wget http://sage.math.washington.edu/home/malb/pkgs/ntl-5.4.1.spkg
2) tar xvfj ntl-5.4.1.spkg
3) export SAGE_ROOT=<YOUR SAGE ROOT>
4) source $SAGE_ROOT/local/bin/sage-env
5) cd ntl-5.4.1
6) export CFLAGS="-O2"; export CXXFLAGS="-O2";
6) ./spkg-install
7) Have a cup of coffee
8) cd src
9) make check
If it passes for you, you may leave this version of NTL installed as it is
likely faster than the version as shipped with SAGE. If it doesn't pass, you
may want to reinstall the original version
1) rm $SAGE_ROOT/spkg/installed/ntl-5.4.1
2) cd $SAGE_ROOT
3) make
should do it.
Thoughts?
Martin
--
name: Martin Albrecht
_pgp: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8EF0DC99
_www: http://www.informatik.uni-bremen.de/~malb
_jab: [EMAIL PROTECTED]
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