Remove --sequential

docs/advanced.rst

@@ -12,7 +12,7 @@ This document covers some of Pipenv's more glorious and advanced features.
 
 - Dependencies of wheels provided in a ``Pipfile`` will not be captured by ``$ pipenv lock``.
 - There are some known issues with using private indexes, related to hashing. We're actively working to solve this problem. You may have great luck with this, however.
-- Installation is intended to be as deterministic as possible — use the ``--sequential`` flag to increase this, if experiencing issues.
+- Installation is intended to be as deterministic as possible.
 
 ☤ Specifying Package Indexes
 ----------------------------

pipenv/cli/command.py

@@ -244,7 +244,6 @@ def install(state, **kwargs):
         ignore_pipfile=state.installstate.ignore_pipfile,
         skip_lock=state.installstate.skip_lock,
         requirementstxt=state.installstate.requirementstxt,
-        sequential=state.installstate.sequential,
         pre=state.installstate.pre,
         deploy=state.installstate.deploy,
         keep_outdated=state.installstate.keep_outdated,
@@ -562,7 +561,6 @@ def update(ctx, state, bare=False, dry_run=None, outdated=False, **kwargs):
         user=False,
         clear=state.clear,
         unused=False,
-        sequential=state.installstate.sequential,
         pypi_mirror=state.pypi_mirror,
         extra_pip_args=state.installstate.extra_pip_args,
     )
@@ -653,7 +651,6 @@ def sync(ctx, state, bare=False, user=False, unused=False, **kwargs):
         user=user,
         clear=state.clear,
         unused=unused,
-        sequential=state.installstate.sequential,
         pypi_mirror=state.pypi_mirror,
         system=state.system,
         extra_pip_args=state.installstate.extra_pip_args,

pipenv/cli/options.py

@@ -82,7 +82,6 @@ def __init__(self):
         self.keep_outdated = False
         self.skip_lock = False
         self.ignore_pipfile = False
-        self.sequential = False
         self.code = False
         self.requirementstxt = None
         self.deploy = False
@@ -133,24 +132,6 @@ def callback(ctx, param, value):
     )(f)
 
 
-def sequential_option(f):
-    def callback(ctx, param, value):
-        state = ctx.ensure_object(State)
-        state.installstate.sequential = value
-        return value
-
-    return option(
-        "--sequential",
-        is_flag=True,
-        default=False,
-        expose_value=False,
-        help="Install dependencies one-at-a-time, instead of concurrently.",
-        callback=callback,
-        type=click_types.BOOL,
-        show_envvar=True,
-    )(f)
-
-
 def skip_lock_option(f):
     def callback(ctx, param, value):
         state = ctx.ensure_object(State)
@@ -583,7 +564,6 @@ def lock_options(f):
 def sync_options(f):
     f = install_base_options(f)
     f = install_dev_option(f)
-    f = sequential_option(f)
     return f
 
 

pipenv/core.py

@@ -755,7 +755,6 @@ def do_install_dependencies(
     allow_global=False,
     ignore_hashes=False,
     skip_lock=False,
-    concurrent=True,
     requirements_dir=None,
     pypi_mirror=None,
     extra_pip_args=None,
@@ -792,10 +791,7 @@ def do_install_dependencies(
             )
     dev = dev or dev_only
     deps_list = list(lockfile.get_requirements(dev=dev, only=dev_only))
-    if concurrent:
-        nprocs = project.s.PIPENV_MAX_SUBPROCESS
-    else:
-        nprocs = 1
+    nprocs = 2
     procs = queue.Queue(maxsize=nprocs)
     failed_deps_queue = queue.Queue()
     if skip_lock:
@@ -1190,7 +1186,6 @@ def do_init(
     ignore_pipfile=False,
     skip_lock=False,
     system=False,
-    concurrent=True,
     deploy=False,
     pre=False,
     keep_outdated=False,
@@ -1293,7 +1288,6 @@ def do_init(
         dev_only=dev_only,
         allow_global=allow_global,
         skip_lock=skip_lock,
-        concurrent=concurrent,
         requirements_dir=requirements_dir,
         pypi_mirror=pypi_mirror,
         extra_pip_args=extra_pip_args,
@@ -2030,7 +2024,6 @@ def do_install(
     ignore_pipfile=False,
     skip_lock=False,
     requirementstxt=False,
-    sequential=False,
     pre=False,
     deploy=False,
     keep_outdated=False,
@@ -2051,7 +2044,6 @@ def do_install(
     # Don't search for requirements.txt files if the user provides one
     if requirementstxt or package_args or project.pipfile_exists:
         skip_requirements = True
-    concurrent = not sequential
     # Ensure that virtualenv is available and pipfile are available
     ensure_project(
         project,
@@ -2186,7 +2178,6 @@ def do_install(
             ignore_pipfile=ignore_pipfile,
             system=system,
             skip_lock=skip_lock,
-            concurrent=concurrent,
             deploy=deploy,
             pre=pre,
             requirements_dir=requirements_directory,
@@ -2207,7 +2198,6 @@ def do_install(
                 dev=dev,
                 system=system,
                 allow_global=system,
-                concurrent=concurrent,
                 keep_outdated=keep_outdated,
                 requirements_dir=requirements_directory,
                 deploy=deploy,
@@ -2357,7 +2347,6 @@ def do_install(
             dev=dev,
             system=system,
             allow_global=system,
-            concurrent=concurrent,
             keep_outdated=keep_outdated,
             requirements_dir=requirements_directory,
             deploy=deploy,
@@ -3032,7 +3021,6 @@ def do_sync(
     user=False,
     clear=False,
     unused=False,
-    sequential=False,
     pypi_mirror=None,
     system=False,
     deploy=False,
@@ -3065,7 +3053,6 @@ def do_sync(
         project,
         dev=dev,
         allow_global=system,
-        concurrent=(not sequential),
         requirements_dir=requirements_dir,
         ignore_pipfile=True,  # Don't check if Pipfile and lock match.
         pypi_mirror=pypi_mirror,

pipenv/environments.py

@@ -196,12 +196,6 @@ def __init__(self) -> None:
         Default is 0. Automatically set to 1 on CI environments for robust testing.
         """
 
-        self.PIPENV_MAX_SUBPROCESS = int(os.environ.get("PIPENV_MAX_SUBPROCESS", "8"))
-        """How many subprocesses should Pipenv use when installing.
-
-        Default is 16, an arbitrary number that seems to work.
-        """
-
         self.PIPENV_NO_INHERIT = "PIPENV_NO_INHERIT" in os.environ
         """Tell Pipenv not to inherit parent directories.
 

tests/integration/test_install_twists.py

@@ -103,58 +103,6 @@ def test_https_dependency_links_install(self, pipenv_instance_pypi):
             )
 
 
-@pytest.mark.install
-@pytest.mark.multiprocessing
-def test_multiprocess_bug_and_install(pipenv_instance_pypi):
-    with temp_environ():
-        os.environ["PIPENV_MAX_SUBPROCESS"] = "2"
-
-        with pipenv_instance_pypi(chdir=True) as p:
-            with open(p.pipfile_path, "w") as f:
-                contents = """
-[packages]
-pytz = "*"
-six = "*"
-dataclasses-json = "*"
-                """.strip()
-                f.write(contents)
-
-            c = p.pipenv("install")
-            assert c.returncode == 0
-
-            assert "pytz" in p.lockfile["default"]
-            assert "six" in p.lockfile["default"]
-            assert "dataclasses-json" in p.lockfile["default"]
-
-            c = p.pipenv('run python -c "import six; import pytz; import dataclasses_json;"')
-            assert c.returncode == 0
-
-
-@pytest.mark.install
-@pytest.mark.sequential
-def test_sequential_mode(pipenv_instance_pypi):
-
-    with pipenv_instance_pypi(chdir=True) as p:
-        with open(p.pipfile_path, "w") as f:
-            contents = """
-[packages]
-six = "*"
-urllib3 = "*"
-pytz = "*"
-            """.strip()
-            f.write(contents)
-
-        c = p.pipenv("install --sequential")
-        assert c.returncode == 0
-
-        assert "six" in p.lockfile["default"]
-        assert "pytz" in p.lockfile["default"]
-        assert "urllib3" in p.lockfile["default"]
-
-        c = p.pipenv('run python -c "import six; import urllib3; import pytz;"')
-        assert c.returncode == 0
-
-
 @pytest.mark.run
 @pytest.mark.install
 def test_normalize_name_install(pipenv_instance_private_pypi):

tests/integration/test_sync.py

@@ -70,30 +70,6 @@ def test_sync_should_not_lock(pipenv_instance_pypi):
         assert lockfile_content == p.lockfile
 
 
-@pytest.mark.sync
-@pytest.mark.lock
-def test_sync_sequential_detect_errors(pipenv_instance_private_pypi):
-    with pipenv_instance_private_pypi() as p:
-        with open(p.pipfile_path, 'w') as f:
-            contents = """
-[packages]
-requests = "*"
-        """.strip()
-            f.write(contents)
-
-        c = p.pipenv('lock')
-        assert c.returncode == 0
-
-        # Force hash mismatch when installing `requests`
-        lock = p.lockfile
-        lock['default']['requests']['hashes'] = ['sha256:' + '0' * 64]
-        with open(p.lockfile_path, 'w') as f:
-            json.dump(lock, f)
-
-        c = p.pipenv('sync --sequential')
-        assert c.returncode != 0
-
-
 @pytest.mark.sync
 def test_sync_consider_pip_target(pipenv_instance_pypi):
     """