Commit graph

745 commits

Author SHA1 Message Date
Matthew Bauer d0677e6d45 treewide: add warning comment to “boot” packages
This adds a warning to the top of each “boot” package that reads:

  Note: this package is used for bootstrapping fetchurl, and thus cannot
  use fetchpatch! All mutable patches (generated by GitHub or cgit) that
  are needed here should be included directly in Nixpkgs as files.

This makes it clear to maintainer that they may need to treat this
package a little differently than others. Importantly, we can’t use
fetchpatch here due to using <nix/fetchurl.nix>. To avoid having stale
hashes, we need to include patches that are subject to changing
overtime (for instance, gitweb’s patches contain a version number at
the bottom).
2020-07-31 08:56:53 +02:00
Mario Rodas ced8ec8488 python39: 3.9.0a4 -> 3.9.0b5 2020-07-26 18:45:54 +02:00
Mario Rodas 79590e27d4 python38: 3.8.3 -> 3.8.5 2020-07-26 18:45:54 +02:00
Frederik Rietdijk 7935bf793e python37: 3.7.7 -> 3.7.8 2020-07-04 18:13:44 +02:00
Frederik Rietdijk 60fb772ae2 python36: 3.6.10 -> 3.6.11 2020-07-04 18:13:44 +02:00
misuzu aedbade43e python3Packages.pip: allow setting reproducible temporary directory via NIX_PIP_INSTALL_TMPDIR 2020-07-02 17:27:13 +02:00
Frederik Rietdijk f03734efa0 python3: improve cross-compilation of extension modules, fixes #91171 2020-06-21 16:29:57 +02:00
Frederik Rietdijk b7aec77a7b buildPythonPackage: don't recompile bytecode
There are too many regressions. Instead of reverting all the work that has been
done on this so far, let's just disable it Python-wide. That way we can
investigate and fix it easier.
2020-06-17 14:54:03 +02:00
Jonathan Ringer b6654d9d6c python2Packages: default to dontUsePythonRecompileBytecode = true; 2020-06-16 13:02:50 -07:00
Frederik Rietdijk 2e4b4e3300 Merge staging-next into staging 2020-06-13 11:03:26 +02:00
Frederik Rietdijk 818cf7827b buildPythonPackage: recompile bytecode for reproducibility
Due to a change in pip the unpacked wheels are no longer reproducible.
We recompile the bytecode to cleanup this error.
https://github.com/NixOS/nixpkgs/issues/81441
2020-06-13 10:36:28 +02:00
Frederik Rietdijk a7ea828f09 pythonRemoveBinBytecodeHook: fix explanation 2020-06-13 10:20:14 +02:00
Frederik Rietdijk 4087d3fe41 python: don't use optimizations on Darwin
Also, don't use autoreconfHook on Darwin with Python 3.
Darwin builds are still impure and fail with

    ld: warning: directory not found for option '-L/nix/store/6yhj9djska835wb6ylg46d2yw9dl0sjb-configd-osx-10.8.5/lib'
    ld: warning: directory not found for option '-L/nix/store/6yhj9djska835wb6ylg46d2yw9dl0sjb-configd-osx-10.8.5/lib'
    ld: warning: object file (/nix/store/0lsij4jl35bnhqhdzla8md6xiswgig5q-Libsystem-osx-10.12.6/lib/crt1.10.6.o) was built for newer OSX version (10.12) than being linked (10.6)
    DYLD_LIBRARY_PATH=/private/tmp/nix-build-python3-3.8.3.drv-0/Python-3.8.3 ./python.exe -E -S -m sysconfig --generate-posix-vars ;\
    if test $? -ne 0 ; then \
            echo "generate-posix-vars failed" ; \
            rm -f ./pybuilddir.txt ; \
            exit 1 ; \
    fi
    /nix/store/dsb7d4dwxk6bzlm845z2zx6wp9a8bqc1-bash-4.4-p23/bin/bash: line 5: 72015 Killed: 9               DYLD_LIBRARY_PATH=/private/tmp/nix-build-python3-3.8.3.drv-0/Python-3.8.3 ./python.exe -E -S -m sysconfig --generate-posix-vars
    generate-posix-vars failed
    make: *** [Makefile:592: pybuilddir.txt] Error 1
2020-06-12 18:29:08 +02:00
Daniël de Kok 1e2b6695cf pythonPackages.setuptoolsBuildHook: do not build in an isolated environment
When a PEP 517 project file is present, pip will not install
prerequisites in `site-packages`:

https://pip.pypa.io/en/stable/reference/pip/#pep-517-and-518-support

For the shell hook, this has the consequence that the generated
temporary directory that is added to PYTHONPATH does not contain
`site.py`. As a result, Python does not discover the Python
module. Thus when a user executes nix-shell in a project, they cannot
import the project's Python module.

This change adds the `--no-build-isolation` option to pip when
creating the editable environment, to correctly generate `site.py`,
even when a `pyproject.toml` is present.
2020-06-06 10:05:26 +02:00
Daniël de Kok e2309df85e pythonPackages.pipBuildHook: do not build in an isolated environment
When a PEP 517 project file is present, pip will not install
prerequisites in `site-packages`:

https://pip.pypa.io/en/stable/reference/pip/#pep-517-and-518-support

For the shell hook, this has the consequence that the generated
temporary directory that is added to PYTHONPATH does not contain
`site.py`. As a result, Python does not discover the Python
module. Thus when a user executes nix-shell in a project, they cannot
import the project's Python module.

This change adds the `--no-build-isolation` option to pip when
creating the editable environment, to correctly generate `site.py`,
even when a `pyproject.toml` is present.
2020-06-06 10:05:26 +02:00
Frederik Rietdijk 1c68570ab2 Merge staging-next into staging 2020-06-05 19:42:16 +02:00
Frederik Rietdijk 43f71029cc Merge master into staging-next 2020-06-05 19:40:53 +02:00
Frederik Rietdijk 913bee36ed python3Minimal: override python38, not python3
This avoids an infinite recursion, accidentally introduced in b7ff746540.
2020-06-05 16:46:40 +02:00
Frederik Rietdijk a337c44db6 python3Minimal: disable optimizations
No point for the bootstrapping.
2020-06-04 20:53:31 +02:00
Frederik Rietdijk bcf03e8cd2 Revert "cpython: Optimize dynamic symbol tables, for a 6% speedup."
ofborg does not like fetching patches when the derivation is used during bootstrapping.

This reverts commit 480c8d1991.
2020-06-04 20:36:31 +02:00
Frederik Rietdijk a2be64bf13
Merge pull request #84072 from gnprice/python-build
cpython: Use optimizations, for a 25% speedup.
2020-06-04 18:31:07 +02:00
Frederik Rietdijk b7ff746540 python3: now points to python38
Note this also means python3Minimal is now also Python 3.8.

This reverts commit eb1369670b and adds more.
2020-06-04 18:08:29 +02:00
Luflosi 2379e36124 python39: fix build on macOS
Basically the same changes as in 81d15948cc but for python3.9 instead of python3.8.
2020-06-04 17:11:29 +02:00
Frederik Rietdijk 0367fa630d python38: 3.8.2 -> 3.8.3 2020-05-27 12:10:25 +02:00
Frederik Rietdijk f17001afd8 Python: fix virtualenv with Python 2 2020-05-24 10:43:24 +02:00
Frederik Rietdijk 98bcf5d8da Python tests: fix use of is_virtualenv
Too many tests set it.
2020-05-24 10:43:24 +02:00
Frederik Rietdijk c778596f56 Merge master into staging-next 2020-05-24 10:03:22 +02:00
Frederik Rietdijk 2de446e0b8 python.tests: also test virtualenv
Test whether creating a virtualenv functions.
2020-05-23 18:15:45 +02:00
adisbladis 203f382a4a
pypy: Remove bootstrap python from closure 2020-05-23 11:47:11 +01:00
Jan Tojnar 7f40cfd97b
Merge branch 'master' into staging-next 2020-05-18 21:09:27 +02:00
Jon 15b3d9d277
python3Packages.venvShellHook: add postVenvCreation (#87850)
* python3Packages.venvShellHook: add postVenvCreation

* python: docs: add postVenvCreation explaination
2020-05-16 09:34:11 +02:00
Greg Price 480c8d1991 cpython: Optimize dynamic symbol tables, for a 6% speedup.
I took a close look at how Debian builds the Python interpreter,
because I noticed it ran substantially faster than the one in nixpkgs
and I was curious why.

One thing that I found made a material difference in performance was
this pair of linker flags (passed to the compiler):

    -Wl,-O1 -Wl,-Bsymbolic-functions

In other words, effectively the linker gets passed the flags:

    -O1 -Bsymbolic-functions

Doing the same thing in nixpkgs turns out to make the interpreter
run about 6% faster, which is quite a big win for such an easy
change.  So, let's apply it.

---

I had not known there was a `-O1` flag for the *linker*!
But indeed there is.

These flags are unrelated to "link-time optimization" (LTO), despite
the latter's name.  LTO means doing classic compiler optimizations
on the actual code, at the linking step when it becomes possible to
do them with cross-object-file information.  These two flags, by
contrast, cause the linker to make certain optimizations within the
scope of its job as the linker.

Documentation is here, though sparse:
  https://sourceware.org/binutils/docs-2.31/ld/Options.html

The meaning of -O1 was explained in more detail in this LWN article:
  https://lwn.net/Articles/192624/
Apparently it makes the resulting symbol table use a bigger hash
table, so the load factor is smaller and lookups are faster.  Cool.

As for -Bsymbolic-functions, the documentation indicates that it's a
way of saving lookups through the symbol table entirely.  There can
apparently be situations where it changes the behavior of a program,
specifically if the program relies on linker tricks to provide
customization features:
  https://bugs.launchpad.net/ubuntu/+source/xfe/+bug/644645
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637184#35
But I'm pretty sure CPython doesn't permit that kind of trick: you
don't load a shared object that tries to redefine some symbol found
in the interpreter core.

The stronger reason I'm confident using -Bsymbolic-functions is
safe, though, is empirical.  Both Debian and Ubuntu have been
shipping a Python built this way since forever -- it was introduced
for the Python 2.4 and 2.5 in Ubuntu "hardy", and Debian "lenny",
released in 2008 and 2009.  In those 12 years they haven't seen a
need to drop this flag; and I've been unable to locate any reports
of trouble related to it, either on the Web in general or on the
Debian bug tracker.  (There are reports of a handful of other
programs breaking with it, but not Python/CPython.)  So that seems
like about as thorough testing as one could hope for.

---

As for the performance impact: I ran CPython upstream's preferred
benchmark suite, "pyperformance", in the same way as described in
the previous commit.  On top of that commit's change, the results
across the 60 benchmarks in the suite are:

The median is 6% faster.

The middle half (aka interquartile range) is from 4% to 8% faster.

Out of 60 benchmarks, 3 come out slower, by 1-4%.  At the other end,
5 are at least 10% faster, and one is 17% faster.

So, that's quite a material speedup!  I don't know how big the
effect of these flags is for other software; but certainly CPython
tends to do plenty of dynamic linking, as that's how it loads
extension modules, which are ubiquitous in the stdlib as well as
popular third-party libraries.  So perhaps that helps explain why
optimizing the dynamic linker has such an impact.
2020-05-13 21:24:30 -07:00
Greg Price 52c04b0347 cpython: Use autoreconfHook to rebuild configure script.
In particular this will let us use patches that apply to configure.ac.
2020-05-13 21:23:48 -07:00
Greg Price f8a8243bd3 cpython: Use --enable-optimizations, for a 16% speedup.
Without this flag, the configure script prints a warning at the end,
like this (reformatted):

  If you want a release build with all stable optimizations active
  (PGO, etc), please run ./configure --enable-optimizations

We're doing a build to distribute to people for day-to-day use,
doing things other than developing the Python interpreter.  So
that's certainly a release build -- we're the target audience for
this recommendation.

---

And, trying it out, upstream isn't kidding!  I ran the standard
benchmark suite that the CPython developers use for performance
work, "pyperformance".  Following its usage instructions:
  https://pyperformance.readthedocs.io/usage.html
I ran the whole suite, like so:

  $ nix-shell -p ./result."$variant" --run '
      cd $(mktemp -d); python -m venv venv; . venv/bin/activate
      pip install pyperformance
      pyperformance run -o ~/tmp/result.'"$variant"'.json
    '

and then examined the results with commands like:

  $ python -m pyperf compare_to --table -G \
      ~/tmp/result.{$before,$after}.json

Across all the benchmarks in the suite, the median speedup was 16%.
(Meaning 1.16x faster; 14% less time).

The middle half of them ranged from a 13% to a 22% speedup.

Each of the 60 benchmarks in the suite got faster, by speedups
ranging from 3% to 53%.

---

One reason this isn't just the default to begin with is that, until
recently, it made the build a lot slower.  What it does is turn on
profile-guided optimization, which means first build for profiling,
then run some task to get a profile, then build again using the
profile.  And, short of further customization, the task it would use
would be nearly the full test suite, which includes a lot of
expensive and slow tests, and can easily take half an hour to run.

Happily, in 2019 an upstream developer did the work to carefully
select a more appropriate set of tests to use for the profile:
  https://github.com/python/cpython/commit/4e16a4a31
  https://bugs.python.org/issue36044
This suite takes just 2 minutes to run.  And the resulting final
build is actually slightly faster than with the much longer suite,
at least as measured by those standard "pyperformance" benchmarks.
That work went into the 3.8 release, but the same list works great
if used on older releases too.

So, start passing that --enable-optimizations flag; and backport
that good-for-PGO set of tests, so that we use it on all releases.
2020-05-11 23:37:04 -07:00
Jonathan Ringer 884436b254 pythonPackages.pytestCheckHook: disable setuptoolsCheckPhase 2020-05-11 22:12:08 +02:00
Josef Kemetmüller 3818cd9049 python: Fix creating RPMs from Python packages
This should enable (manual) building of RPMs from python projects using
the `python setup.py bdist_rpm` command on systems where `rpmbuild` is
not located in `/usr/bin/`. (e.g. NixOS)
The discovery of the rpmbuild command was fixed upstream in Python 3.8,
so this commit backports the relevant patch to our currently supported
Python 3 versions.

Fixes: #85204
2020-05-09 11:15:28 +02:00
Pavol Rusnak 420124adf8 python: remove isPy33, isPy34 2020-05-04 18:49:45 -07:00
Frederik Rietdijk 6f873e98f4 Python integration tests: disable for older python 3 versions
because the package that is used as part of the test does not support
older versions.
2020-04-25 07:59:37 +02:00
Frederik Rietdijk 71171b3225 Python tests: test venv from a nix env with Python 3.8
This test was disabled because it did not function yet, however,
apparently it does with 3.8.
2020-04-25 07:59:37 +02:00
Frederik Rietdijk cf1a68360e python2: 2.7.17 -> 2.7.18 2020-04-21 11:21:39 +02:00
Michael Reilly 84cf00f980
treewide: Per RFC45, remove all unquoted URLs 2020-04-10 17:54:53 +01:00
Jan Tojnar 3e0f4e202f
Merge branch 'master' into staging-next 2020-03-31 21:32:15 +02:00
Greg Price 9d8831c8fe cpython: Drop unrecognized --with-threads configure flag.
The ./configure script prints a warning when passed this flag,
starting with 3.7:

  configure: WARNING: unrecognized options: --with-threads

The reason is that there's no longer such a thing as a build
without threads.

Eliminate the warning, by only passing the flag on the older releases
that accept it.

Upstream change and discussion:
  https://github.com/python/cpython/commit/a6a4dc816
  https://bugs.python.org/issue31370
2020-03-30 22:56:48 -07:00
Frederik Rietdijk c392d70518 pkgsStatic.python3: fix build 2020-03-30 17:06:38 +02:00
Frederik Rietdijk a36be028f5 Merge staging-next into staging 2020-03-28 21:15:15 +01:00
Jonathan Ringer 279438e7f8 python: add use-pkgs-prefix option to update script 2020-03-27 01:47:30 -07:00
Jonathan Ringer a9c994ad0b python: add pythonNamespacesHook 2020-03-18 12:20:51 -07:00
Frederik Rietdijk 7447fff95a
Fix sys.prefix in case of a Nix env
The prefix will now be correct in case of Nix env.

Note, however, that creating a venv from a Nix env still does not function. This does not seem to be possible
with the current approach either, because venv will copy or symlink our Python wrapper. In case it symlinks
(the default) it won't see a pyvenv.cfg. If it is copied I think it should function but it does not...
2020-03-14 21:39:32 +00:00
adisbladis 753122388d
Python: Add integration test verifying NIX_PYTHONPATH with Mypy 2020-03-14 21:39:32 +00:00
adisbladis 05571d3059
Python Add test for NIX_PYTHONPREFIX 2020-03-14 21:39:31 +00:00