Which packages optimize performance parameters during build?

asked 2013-12-17 21:14:26 +0200

rickhg12hs
136 ●6 ●8 ●15

updated 2013-12-23 04:31:32 +0200

Which packages use performance testing during the build process to optimize it? For example, I know NTL and Atlas do some testing to pick the best parameters for the platform. What other packages do this?

If I want to rebuild the performance testing packages during system "low-load" times, how should that be done? Like this? [Edited to fix character case]

$ ./sage -f ntl  && ./sage -f atlas ... && ./sage -b

Are there dependencies? In what order should they be rebuilt?

answered 2013-12-23 04:01:08 +0200

ppurka
2111 ●17 ●38

Yes, something close to that command will work. In particular, you need to provide the package name taking care of the upper or lower case. To find the exact package name, you can look at

SAGE_ROOT/spkg/standard directory for sage version up to 5.13.
SAGE_ROOT/upstream directory for sage version from 6.0 onwards.

If you have installed sage earlier, then you don't need to do anything else. The commands you gave (with proper case) are more than enough. They will simply recompile those specific packages. Other packages do not need to be recompiled.

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So it's really only `ntl` and `atlas` that doing any build parameter performance testing?

rickhg12hs ( 2013-12-23 04:32:28 +0200 )edit

You will have to look at the output of the various packages (check `SAGE_ROOT/logs/install.log`). I suspect r might be also doing some tuning. In fact, almost all compiled packages _should_ be doing some tuning, at least for the compilation flags, so that it is specific to your architecture. If you want to force some compile time optimization, you can define the `CFLAGS` before compiling: $ export CFLAGS="-march=native -pipe" $ export CXXFLAGS="${CFLAGS}" You can read up on `-march=native` from your gcc manual. You can check what it enables by comparing the output of the following two commands $ gcc -Q -march=native --help=target $ gcc -Q --help=target

ppurka ( 2013-12-23 09:37:35 +0200 )edit

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