Add parallel test target, using pytest-xdist

[wiredfool]

Changes proposed in this pull request:

• Added parallel test target in the make file.

This seems to be running 4 runners on an 8 core machine, for about a 2.5x speedup. Note that this is on the standard with GIL python, but I'm seeing 1.5x the user time. -n 8 on this machine doesn't speed up the wall clock time much (2-4%, but does significantly add to user time.

(note, these numbers are a 8 core intel server in the cloud, probably 5 years old at this point)

$ time make test
....
real	2m8.944s
user	2m1.800s
sys	0m8.598s

$ time make test-p
...
real	0m47.244s
user	3m3.306s
sys	0m10.233s

On an M4 Air

$ time make test 
...
real    0m38.527s
user    0m32.428s
sys     0m5.074s

$ time make test-p
real    0m12.731s
user    0m59.613s
sys     0m8.361s

[hugovk]

That's a huge improvement!

Shall we just make it the default? Then it'll be used through make, tox, and direct pytest.

--- a/pyproject.toml
+++ b/pyproject.toml
 [tool.pytest.ini_options]
-addopts = "-ra --color=yes"
+addopts = "-ra --color=yes --numprocesses=auto"

Although it does change the (pytest and tox) output from:

Tests/oss-fuzz/test_fuzzers.py ................................................................... [  1%]
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Tests/test_000_sanity.py .                                                                         [ 23%]
Tests/test_arrow.py ......................                                                         [ 23%]
Tests/test_binary.py ...                                                                           [ 23%]
Tests/test_bmp_reference.py ...                                                                    [ 23%]
Tests/test_box_blur.py ................                                                            [ 24%]
Tests/test_color_lut.py .......................ss.............                                     [ 24%]
Tests/test_core_resources.py ................                                                      [ 25%]
Tests/test_decompression_bomb.py ...........                                                       [ 25%]
Tests/test_deprecate.py ..........                                                                 [ 25%]
Tests/test_features.py ......s................                                                     [ 25%]
Tests/test_file_apng.py ............................................                               [ 26%]
Tests/test_file_avif.py ..................................................................s....... [ 28%]
s...s....s......s...........                                                                       [ 28%]
Tests/test_file_blp.py .............                                                               [ 29%]
Tests/test_file_bmp.py .............................                                               [ 29%]
Tests/test_file_bufrstub.py .....                                                                  [ 29%]
Tests/test_file_container.py ........................                                              [ 30%]
Tests/test_file_cur.py ..                                                                          [ 30%]
Tests/test_file_dcx.py .........                                                                   [ 30%]
Tests/test_file_dds.py ................................................                            [ 31%]
Tests/test_file_eps.py ..........................................................                  [ 32%]
Tests/test_file_fits.py ......                                                                     [ 32%]
Tests/test_file_fli.py .................                                                           [ 33%]
Tests/test_file_fpx.py ....                                                                        [ 33%]
Tests/test_file_ftex.py ....                                                                       [ 33%]
Tests/test_file_gbr.py ....                                                                        [ 33%]
Tests/test_file_gd.py ...                                                                          [ 33%]
Tests/test_file_gif.py ........................................................................... [ 34%]
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Tests/test_file_gimpgradient.py ..........                                                         [ 35%]
Tests/test_file_gimppalette.py ....                                                                [ 35%]
Tests/test_file_gribstub.py .....                                                                  [ 35%]
Tests/test_file_hdf5stub.py .....                                                                  [ 35%]
Tests/test_file_icns.py ...........                                                                [ 36%]
Tests/test_file_ico.py ......................                                                      [ 36%]
Tests/test_file_im.py ...............                                                              [ 36%]
Tests/test_file_imt.py ....                                                                        [ 37%]
Tests/test_file_iptc.py ..........                                                                 [ 37%]
Tests/test_file_jpeg.py .......................................................................... [ 38%]
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Tests/test_file_jpeg2k.py .....................s................ss..........sssss........          [ 40%]
Tests/test_file_libtiff.py ...........................................................s........... [ 41%]
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Tests/test_file_libtiff_small.py ...                                                               [ 42%]
Tests/test_file_mcidas.py ..                                                                       [ 42%]
Tests/test_file_mic.py .......                                                                     [ 42%]
Tests/test_file_mpeg.py ...                                                                        [ 42%]
Tests/test_file_mpo.py ................................                                            [ 43%]
Tests/test_file_msp.py .......                                                                     [ 43%]
Tests/test_file_palm.py ....                                                                       [ 43%]
Tests/test_file_pcd.py .                                                                           [ 43%]
Tests/test_file_pcx.py ..................                                                          [ 44%]
Tests/test_file_pdf.py .....................                                                       [ 44%]
Tests/test_file_pixar.py ..                                                                        [ 44%]
Tests/test_file_png.py .............................................................               [ 45%]
Tests/test_file_ppm.py ..............................................                              [ 46%]
Tests/test_file_psd.py ....................                                                        [ 47%]
Tests/test_file_qoi.py ..                                                                          [ 47%]
Tests/test_file_sgi.py .............                                                               [ 47%]
Tests/test_file_spider.py ................                                                         [ 47%]
Tests/test_file_sun.py ........                                                                    [ 47%]
Tests/test_file_tar.py .......                                                                     [ 47%]
Tests/test_file_tga.py ........................................                                    [ 48%]
Tests/test_file_tiff.py .......................................................................... [ 50%]
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Tests/test_file_tiff_metadata.py ............................                                      [ 51%]
Tests/test_file_wal.py ..                                                                          [ 51%]
Tests/test_file_webp.py .......................                                                    [ 51%]
Tests/test_file_webp_alpha.py ......                                                               [ 51%]
Tests/test_file_webp_animated.py ........                                                          [ 51%]
Tests/test_file_webp_lossless.py .                                                                 [ 51%]
Tests/test_file_webp_metadata.py ........                                                          [ 52%]
Tests/test_file_wmf.py .........                                                                   [ 52%]
Tests/test_file_xbm.py ......                                                                      [ 52%]
Tests/test_file_xpm.py ...                                                                         [ 52%]
Tests/test_file_xvthumb.py ...                                                                     [ 52%]
Tests/test_font_bdf.py ...                                                                         [ 52%]
Tests/test_font_crash.py .                                                                         [ 52%]
Tests/test_font_leaks.py ..                                                                        [ 52%]
Tests/test_font_pcf.py ......                                                                      [ 52%]
Tests/test_font_pcf_charsets.py .........                                                          [ 52%]
Tests/test_fontfile.py ..                                                                          [ 52%]
Tests/test_format_hsv.py ....                                                                      [ 52%]
Tests/test_format_lab.py ...                                                                       [ 53%]
Tests/test_image.py .............................................................................. [ 54%]
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Tests/test_image_access.py ..s......................................................s              [ 58%]
Tests/test_image_convert.py ...........................                                            [ 58%]
Tests/test_image_copy.py ........                                                                  [ 58%]
Tests/test_image_crop.py .............                                                             [ 59%]
Tests/test_image_draft.py ...                                                                      [ 59%]
Tests/test_image_entropy.py .                                                                      [ 59%]
Tests/test_image_filter.py ....................................................................... [ 60%]
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Tests/test_image_frombytes.py ..                                                                   [ 63%]
Tests/test_image_fromqimage.py sssss                                                               [ 63%]
Tests/test_image_getbands.py .                                                                     [ 63%]
Tests/test_image_getbbox.py .......                                                                [ 64%]
Tests/test_image_getcolors.py ..                                                                   [ 64%]
Tests/test_image_getdata.py ..                                                                     [ 64%]
Tests/test_image_getextrema.py ..                                                                  [ 64%]
Tests/test_image_getim.py .                                                                        [ 64%]
Tests/test_image_getpalette.py ..                                                                  [ 64%]
Tests/test_image_getprojection.py .                                                                [ 64%]
Tests/test_image_histogram.py .                                                                    [ 64%]
Tests/test_image_load.py .....                                                                     [ 64%]
Tests/test_image_mode.py ...........                                                               [ 64%]
Tests/test_image_paste.py ...................................                                      [ 65%]
Tests/test_image_point.py ....                                                                     [ 65%]
Tests/test_image_putalpha.py ...                                                                   [ 65%]
Tests/test_image_putdata.py ...............                                                        [ 65%]
Tests/test_image_putpalette.py ........                                                            [ 65%]
Tests/test_image_quantize.py .s...............                                                     [ 66%]
Tests/test_image_reduce.py ....................................................................... [ 67%]
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Tests/test_image_resample.py ...............................................xx.................... [ 71%]
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Tests/test_image_resize.py ....................................................................... [ 73%]
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Tests/test_image_rotate.py ..........................                                              [ 74%]
Tests/test_image_split.py ...........                                                              [ 74%]
Tests/test_image_thumbnail.py ..........                                                           [ 74%]
Tests/test_image_tobitmap.py .                                                                     [ 74%]
Tests/test_image_tobytes.py .                                                                      [ 74%]
Tests/test_image_transform.py .................................................................... [ 75%]
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Tests/test_image_transpose.py ........................................                             [ 76%]
Tests/test_imagechops.py ..............................                                            [ 77%]
Tests/test_imagecms.py ......................................                                      [ 78%]
Tests/test_imagecolor.py ......                                                                    [ 78%]
Tests/test_imagedraw.py .......................................................................... [ 79%]
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Tests/test_imagedraw2.py ................................................                          [ 84%]
Tests/test_imageenhance.py ......                                                                  [ 84%]
Tests/test_imagefile.py ...........................                                                [ 85%]
Tests/test_imagefont.py .......................................................................... [ 86%]
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Tests/test_imagefontctl.py ......................................ss............................... [ 90%]
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Tests/test_imagefontpil.py ......                                                                  [ 91%]
Tests/test_imagegrab.py .ss.s.sssssss                                                              [ 91%]
Tests/test_imagemath_lambda_eval.py .......................                                        [ 92%]
Tests/test_imagemath_unsafe_eval.py .............................                                  [ 92%]
Tests/test_imagemorph.py .......................                                                   [ 93%]
Tests/test_imageops.py ...................................                                         [ 93%]
Tests/test_imageops_usm.py .....                                                                   [ 93%]
Tests/test_imagepalette.py ...............                                                         [ 94%]
Tests/test_imagepath.py ............................                                               [ 94%]
Tests/test_imageqt.py ssssssss                                                                     [ 94%]
Tests/test_imagesequence.py ........                                                               [ 95%]
Tests/test_imageshow.py ....sssss..............                                                    [ 95%]
Tests/test_imagestat.py ...                                                                        [ 95%]
Tests/test_imagetk.py .............                                                                [ 95%]
Tests/test_imagewin.py ...ssssss                                                                   [ 95%]
Tests/test_lib_image.py .                                                                          [ 95%]
Tests/test_lib_pack.py ......................................                                      [ 96%]
Tests/test_locale.py s                                                                             [ 96%]
Tests/test_main.py ...                                                                             [ 96%]
Tests/test_map.py ..s                                                                              [ 96%]
Tests/test_mode_i16.py .......                                                                     [ 97%]
Tests/test_pdfparser.py .....                                                                      [ 97%]
Tests/test_pickle.py ............................................................................. [ 98%]
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Tests/test_psdraw.py ..                                                                            [ 99%]
Tests/test_pyroma.py .                                                                             [ 99%]
Tests/test_qt_image_qapplication.py s                                                              [ 99%]
Tests/test_qt_image_toqimage.py sssss                                                              [ 99%]
Tests/test_sgi_crash.py ...........                                                                [ 99%]
Tests/test_shell_injection.py ....                                                                 [ 99%]
Tests/test_tiff_crashes.py ...............                                                         [ 99%]
Tests/test_tiff_ifdrational.py .....                                                               [ 99%]
Tests/test_util.py .....                                                                           [ 99%]
Tests/test_webp_leaks.py .                                                                         [100%]

To:

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One option is to add pytest-sugar to optional-dependencies.tests (see https://blog.trailofbits.com/2025/05/01/making-pypis-test-suite-81-faster/ for sample video):

 Tests/oss-fuzz/test_fuzzers.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓  1% ▎
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 Tests/test_000_sanity.py ✓                                                                           3% ▍
 Tests/test_arrow.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                                                           5% ▌
 Tests/oss-fuzz/test_fuzzers.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓  6% ▋
 Tests/test_binary.py ✓✓✓                                                                             5% ▌
 Tests/test_bmp_reference.py ✓✓✓                                                                      7% ▋
 Tests/oss-fuzz/test_fuzzers.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓  8% ▊
 Tests/test_box_blur.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                                                              7% ▊
 Tests/test_color_lut.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                                       9% ▉
 Tests/oss-fuzz/test_fuzzers.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓ 10% █
 Tests/test_core_resources.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                                                       10% ▉
 Tests/test_decompression_bomb.py ✓✓✓✓✓✓✓✓✓✓✓                                                        14% █▌
 Tests/test_file_avif.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                          35% ███▌
 Tests/oss-fuzz/test_fuzzers.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓ 12% █▎
 Tests/test_file_avif.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                         36% ███▋
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 Tests/test_deprecate.py ✓✓✓✓✓✓✓✓✓✓                                                                  15% █▌
 Tests/test_file_avif.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                       36% ███▋
 Tests/test_features.py ✓✓✓✓✓✓s✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                                                      15% █▌
 Tests/test_file_avif.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                      37% ███▋
 Tests/test_file_avif.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓s                  38% ███▉
                                ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓ 18% █▉
 Tests/test_file_avif.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓s✓✓                39% ███▉
 Tests/test_file_avif.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓s✓✓✓✓✓✓✓s✓✓✓s✓✓✓✓s 40% ████
 Tests/test_file_dds.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓                             38% ███▊
 Tests/oss-fuzz/test_fuzzers.py ✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓✓ 23% ██▍
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[wiredfool]

I think the format change is the -qq in the make test that isn't the same as the standard tests we're running in CI. The output is (mostly, barring some threading issues) the same between make test and make test-p.

One interesting thing -- if we do this, we're going to be running parallel tests on freethread python, which would definitely be a good thing.

Edit -- looks like #8492 is actually referring to pytest-run-parallel, which is threads.

[wiredfool]

The only thing that we'd have to be careful of is the valgrind tests can only run in one process thread. Something is off between pytest-valgrind and pytest-xdist that doesn't play nicely with the multiple runners, even when valgrind is tracing subprocesses.

[hugovk]

The formatting change also happens when running plain pytest, so it's not only -qq in the Makefile.

[wiredfool]

I don't care that much about what the format is, other than I want fast tests when I'm iterating. Shorter CI logs aren't a bad thing, but there's a lot less context when you're tailing them.

[radarhere]

If the Makefile is going to install pytest-xdist by itself, and we're not using it anywhere else, I don't think this needs to be in pyproject.toml?

[wiredfool]

Depends on if we decide to make it the default or not, really.

[wiredfool]

Looking at the parallel by default issue --

1. we'd need to add it to all of the docker images
2. It's going to fail on valgrind without rewriting those test invocations.

[wiredfool]

Since this is basically makefile only, merging now. We can look at setting this as default in another PR