update to latest master

.github/workflows/parsl+flux.yaml

@@ -31,12 +31,12 @@ jobs:
         run: |
           pytest parsl/tests/ -k "not cleannet and not unix_filesystem_permissions_required" --config parsl/tests/configs/local_threads.py --random-order --durations 10
 
-      - name: Start Flux and Test Parsl with Flux
+      - name: Test Parsl with Flux
         run: |
-          flux start pytest parsl/tests/test_flux.py --config local  --random-order
+          pytest parsl/tests/test_flux.py --config local  --random-order
 
       - name: Test Parsl with Flux Config
         run: |
-          flux start pytest parsl/tests/ -k "not cleannet and not unix_filesystem_permissions_required" --config parsl/tests/configs/flux_local.py --random-order --durations 10
+          pytest parsl/tests/ -k "not cleannet and not unix_filesystem_permissions_required" --config parsl/tests/configs/flux_local.py --random-order --durations 10
 
 

README.rst

@@ -109,7 +109,7 @@ For Developers
 
 3. Install::
 
-    $ cd parsl
+    $ cd parsl # only if you didn't enter the top-level directory in step 2 above
     $ python3 setup.py install
 
 4. Use Parsl!

docs/historical/changelog.rst

@@ -334,7 +334,7 @@ New Functionality
 
 * New launcher: `parsl.launchers.WrappedLauncher` for launching tasks inside containers.
 
-* `parsl.channels.SSHChannel` now supports a ``key_filename`` kwarg `issue#1639 <https://github.com/Parsl/parsl/issues/1639>`_
+* ``parsl.channels.SSHChannel`` now supports a ``key_filename`` kwarg `issue#1639 <https://github.com/Parsl/parsl/issues/1639>`_
 
 * Newly added Makefile wraps several frequent developer operations such as:
 
@@ -442,7 +442,7 @@ New Functionality
   module, parsl.data_provider.globus
 
 * `parsl.executors.WorkQueueExecutor`: a new executor that integrates functionality from `Work Queue <http://ccl.cse.nd.edu/software/workqueue/>`_ is now available.
-* New provider to support for Ad-Hoc clusters `parsl.providers.AdHocProvider`
+* New provider to support for Ad-Hoc clusters ``parsl.providers.AdHocProvider``
 * New provider added to support LSF on Summit `parsl.providers.LSFProvider`
 * Support for CPU and Memory resource hints to providers `(github) <https://github.com/Parsl/parsl/issues/942>`_.
 * The ``logging_level=logging.INFO`` in `parsl.monitoring.MonitoringHub` is replaced with ``monitoring_debug=False``:
@@ -468,7 +468,7 @@ New Functionality
 
 * Several test-suite improvements that have dramatically reduced test duration.
 * Several improvements to the Monitoring interface.
-* Configurable port on `parsl.channels.SSHChannel`.
+* Configurable port on ``parsl.channels.SSHChannel``.
 * ``suppress_failure`` now defaults to True.
 * `parsl.executors.HighThroughputExecutor` is the recommended executor, and ``IPyParallelExecutor`` is deprecated.
 * `parsl.executors.HighThroughputExecutor` will expose worker information via environment variables: ``PARSL_WORKER_RANK`` and ``PARSL_WORKER_COUNT``
@@ -532,7 +532,7 @@ New Functionality
 
 * Cleaner user app file log management.
 * Updated configurations using `parsl.executors.HighThroughputExecutor` in the configuration section of the userguide.
-* Support for OAuth based SSH with `parsl.channels.OAuthSSHChannel`.
+* Support for OAuth based SSH with ``parsl.channels.OAuthSSHChannel``.
 
 Bug Fixes
 ^^^^^^^^^

docs/reference.rst

@@ -38,15 +38,9 @@ Configuration
 Channels
 ========
 
-.. autosummary::
-    :toctree: stubs
-    :nosignatures:
-
-    parsl.channels.base.Channel
-    parsl.channels.LocalChannel
-    parsl.channels.SSHChannel
-    parsl.channels.OAuthSSHChannel
-    parsl.channels.SSHInteractiveLoginChannel
+Channels are deprecated in Parsl. See
+`issue 3515 <https://github.com/Parsl/parsl/issues/3515>`_
+for further discussion.
 
 Data management
 ===============
@@ -109,7 +103,6 @@ Providers
     :toctree: stubs
     :nosignatures:
 
-    parsl.providers.AdHocProvider
     parsl.providers.AWSProvider
     parsl.providers.CobaltProvider
     parsl.providers.CondorProvider

docs/userguide/checkpoints.rst

@@ -49,15 +49,17 @@ during development. Using app caching will ensure that only modified apps are re
 App equivalence 
 ^^^^^^^^^^^^^^^
 
-Parsl determines app equivalence by storing the hash
-of the app function. Thus, any changes to the app code (e.g., 
-its signature, its body, or even the docstring within the body)
-will invalidate cached values. 
+Parsl determines app equivalence using the name of the app function:
+if two apps have the same name, then they are equivalent under this
+relation.
 
-However, Parsl does not traverse the call graph of the app function,
-so changes inside functions called by an app will not invalidate
+Changes inside the app, or by functions called by an app will not invalidate
 cached values.
 
+There are lots of other ways functions might be compared for equivalence,
+and `parsl.dataflow.memoization.id_for_memo` provides a hook to plug in
+alternate application-specific implementations.
+
 
 Invocation equivalence 
 ^^^^^^^^^^^^^^^^^^^^^^
@@ -92,7 +94,7 @@ Attempting to cache apps invoked with other, non-hashable, data types will
 lead to an exception at invocation.
 
 In that case, mechanisms to hash new types can be registered by a program by
-implementing the ``parsl.dataflow.memoization.id_for_memo`` function for
+implementing the `parsl.dataflow.memoization.id_for_memo` function for
 the new type.
 
 Ignoring arguments

docs/userguide/configuring.rst

@@ -15,15 +15,14 @@ queues, durations, and data management options.
 The following example shows a basic configuration object (:class:`~parsl.config.Config`) for the Frontera
 supercomputer at TACC.
 This config uses the `parsl.executors.HighThroughputExecutor` to submit
-tasks from a login node (`parsl.channels.LocalChannel`). It requests an allocation of
+tasks from a login node. It requests an allocation of
 128 nodes, deploying 1 worker for each of the 56 cores per node, from the normal partition.
 To limit network connections to just the internal network the config specifies the address
 used by the infiniband interface with ``address_by_interface('ib0')``
 
 .. code-block:: python
 
     from parsl.config import Config
-    from parsl.channels import LocalChannel
     from parsl.providers import SlurmProvider
     from parsl.executors import HighThroughputExecutor
     from parsl.launchers import SrunLauncher
@@ -36,7 +35,6 @@ used by the infiniband interface with ``address_by_interface('ib0')``
                 address=address_by_interface('ib0'),
                 max_workers_per_node=56,
                 provider=SlurmProvider(
-                    channel=LocalChannel(),
                     nodes_per_block=128,
                     init_blocks=1,
                     partition='normal',                                 
@@ -197,22 +195,6 @@ Stepping through the following question should help formulate a suitable configu
           are on a **native Slurm** system like :ref:`configuring_nersc_cori`
 
 
-4) Where will the main Parsl program run and how will it communicate with the apps?
-
-+------------------------+--------------------------+---------------------------------------------------+
-| Parsl program location | App execution target     | Suitable channel                                  |
-+========================+==========================+===================================================+
-| Laptop/Workstation     | Laptop/Workstation       | `parsl.channels.LocalChannel`                     |
-+------------------------+--------------------------+---------------------------------------------------+
-| Laptop/Workstation     | Cloud Resources          | No channel is needed                              |
-+------------------------+--------------------------+---------------------------------------------------+
-| Laptop/Workstation     | Clusters with no 2FA     | `parsl.channels.SSHChannel`                       |
-+------------------------+--------------------------+---------------------------------------------------+
-| Laptop/Workstation     | Clusters with 2FA        | `parsl.channels.SSHInteractiveLoginChannel`       |
-+------------------------+--------------------------+---------------------------------------------------+
-| Login node             | Cluster/Supercomputer    | `parsl.channels.LocalChannel`                     |
-+------------------------+--------------------------+---------------------------------------------------+
-
 Heterogeneous Resources
 -----------------------
 
@@ -324,9 +306,13 @@ and Work Queue does not require Python to run.
 Accelerators
 ------------
 
-Many modern clusters provide multiple accelerators per compute note, yet many applications are best suited to using a single accelerator per task.
-Parsl supports pinning each worker to difference accelerators using ``available_accelerators`` option of the :class:`~parsl.executors.HighThroughputExecutor`.
-Provide either the number of executors (Parsl will assume they are named in integers starting from zero) or a list of the names of the accelerators available on the node.
+Many modern clusters provide multiple accelerators per compute note, yet many applications are best suited to using a
+single accelerator per task. Parsl supports pinning each worker to different accelerators using
+``available_accelerators`` option of the :class:`~parsl.executors.HighThroughputExecutor`. Provide either the number of
+executors (Parsl will assume they are named in integers starting from zero) or a list of the names of the accelerators
+available on the node. Parsl will limit the number of workers it launches to the number of accelerators specified,
+in other words, you cannot have more workers per node than there are accelerators. By default, Parsl will launch
+as many workers as the accelerators specified via ``available_accelerators``.
 
 .. code-block:: python
 
@@ -337,7 +323,6 @@ Provide either the number of executors (Parsl will assume they are named in inte
                 worker_debug=True,
                 available_accelerators=2,
                 provider=LocalProvider(
-                    channel=LocalChannel(),
                     init_blocks=1,
                     max_blocks=1,
                 ),
@@ -346,7 +331,38 @@ Provide either the number of executors (Parsl will assume they are named in inte
         strategy='none',
     )
 
-For hardware that uses Nvidia devices, Parsl allows for the oversubscription of workers to GPUS.  This is intended to make use of Nvidia's `Multi-Process Service (MPS) <https://docs.nvidia.com/deploy/mps/>`_ available on many of their GPUs that allows users to run multiple concurrent processes on a single GPU.  The user needs to set in the ``worker_init`` commands to start MPS on every node in the block (this is machine dependent).  The ``available_accelerators`` option should then be set to the total number of GPU partitions run on a single node in the block.  For example, for a node with 4 Nvidia GPUs, to create 8 workers per GPU, set ``available_accelerators=32``.  GPUs will be assigned to workers in ascending order in contiguous blocks.  In the example, workers 0-7 will be placed on GPU 0, workers 8-15 on GPU 1, workers 16-23 on GPU 2, and workers 24-31 on GPU 3. 
+It is possible to bind multiple/specific accelerators to each worker by specifying a list of comma separated strings
+each specifying accelerators. In the context of binding to NVIDIA GPUs, this works by setting ``CUDA_VISIBLE_DEVICES``
+on each worker to a specific string in the list supplied to ``available_accelerators``.
+
+Here's an example:
+
+.. code-block:: python
+
+    # The following config is trimmed for clarity
+    local_config = Config(
+        executors=[
+            HighThroughputExecutor(
+                # Starts 2 workers per node, each bound to 2 GPUs
+                available_accelerators=["0,1", "2,3"],
+
+                # Start a single worker bound to all 4 GPUs
+                # available_accelerators=["0,1,2,3"]
+            )
+        ],
+    )
+
+GPU Oversubscription
+""""""""""""""""""""
+
+For hardware that uses Nvidia devices, Parsl allows for the oversubscription of workers to GPUS.  This is intended to
+make use of Nvidia's `Multi-Process Service (MPS) <https://docs.nvidia.com/deploy/mps/>`_ available on many of their
+GPUs that allows users to run multiple concurrent processes on a single GPU.  The user needs to set in the
+``worker_init`` commands to start MPS on every node in the block (this is machine dependent).  The
+``available_accelerators`` option should then be set to the total number of GPU partitions run on a single node in the
+block.  For example, for a node with 4 Nvidia GPUs, to create 8 workers per GPU, set ``available_accelerators=32``.
+GPUs will be assigned to workers in ascending order in contiguous blocks.  In the example, workers 0-7 will be placed
+on GPU 0, workers 8-15 on GPU 1, workers 16-23 on GPU 2, and workers 24-31 on GPU 3.
 
 Multi-Threaded Applications
 ---------------------------
@@ -372,7 +388,6 @@ Select the best blocking strategy for processor's cache hierarchy (choose ``alte
                 worker_debug=True,
                 cpu_affinity='alternating',
                 provider=LocalProvider(
-                    channel=LocalChannel(),
                     init_blocks=1,
                     max_blocks=1,
                 ),
@@ -412,18 +427,12 @@ These include ``OMP_NUM_THREADS``, ``GOMP_COMP_AFFINITY``, and ``KMP_THREAD_AFFI
 Ad-Hoc Clusters
 ---------------
 
-Any collection of compute nodes without a scheduler can be considered an
-ad-hoc cluster. Often these machines have a shared file system such as NFS or Lustre.
-In order to use these resources with Parsl, they need to set-up for password-less SSH access.
-
-To use these ssh-accessible collection of nodes as an ad-hoc cluster, we use
-the `parsl.providers.AdHocProvider` with an `parsl.channels.SSHChannel` to each node. An example
-configuration follows.
+Parsl's support of ad-hoc clusters of compute nodes without a scheduler
+is deprecated.
 
-.. literalinclude:: ../../parsl/configs/ad_hoc.py
-
-.. note::
-   Multiple blocks should not be assigned to each node when using the `parsl.executors.HighThroughputExecutor`
+See
+`issue #3515 <https://github.com/Parsl/parsl/issues/3515>`_
+for further discussion.
 
 Amazon Web Services
 -------------------

docs/userguide/examples/config.py

@@ -1,4 +1,3 @@
-from parsl.channels import LocalChannel
 from parsl.config import Config
 from parsl.executors import HighThroughputExecutor
 from parsl.providers import LocalProvider
@@ -8,9 +7,7 @@
         HighThroughputExecutor(
             label="htex_local",
             cores_per_worker=1,
-            provider=LocalProvider(
-                channel=LocalChannel(),
-            ),
+            provider=LocalProvider(),
         )
     ],
 )

docs/userguide/execution.rst

@@ -47,8 +47,7 @@ Parsl currently supports the following providers:
 7. `parsl.providers.AWSProvider`: This provider allows you to provision and manage cloud nodes from Amazon Web Services.
 8. `parsl.providers.GoogleCloudProvider`: This provider allows you to provision and manage cloud nodes from Google Cloud.
 9. `parsl.providers.KubernetesProvider`: This provider allows you to provision and manage containers on a Kubernetes cluster.
-10. `parsl.providers.AdHocProvider`: This provider allows you manage execution over a collection of nodes to form an ad-hoc cluster.
-11. `parsl.providers.LSFProvider`: This provider allows you to schedule resources via IBM's LSF scheduler.
+10. `parsl.providers.LSFProvider`: This provider allows you to schedule resources via IBM's LSF scheduler.
 
 
 

docs/userguide/mpi_apps.rst

@@ -60,6 +60,13 @@ An example for ALCF's Polaris supercomputer that will run 3 MPI tasks of 2 nodes
     )
 
 
+.. warning::
+   Please note that ``Provider`` options that specify per-task or per-node resources, for example,
+   ``SlurmProvider(cores_per_node=N, ...)`` should not be used with :class:`~parsl.executors.high_throughput.MPIExecutor`.
+   Parsl primarily uses a pilot job model and assumptions from that context do not translate to the MPI context. For
+   more info refer to :
+   `github issue #3006 <https://github.com/Parsl/parsl/issues/3006>`_
+
 Writing an MPI App
 ------------------
 

docs/userguide/plugins.rst

@@ -16,8 +16,8 @@ executor to run code on the local submitting host, while another executor can
 run the same code on a large supercomputer.
 
 
-Providers, Launchers and Channels
----------------------------------
+Providers and Launchers
+-----------------------
 Some executors are based on blocks of workers (for example the
 `parsl.executors.HighThroughputExecutor`: the submit side requires a
 batch system (eg slurm, kubernetes) to start worker processes, which then
@@ -34,10 +34,9 @@ add on any wrappers that are needed to launch the command (eg srun inside
 slurm). Providers and launchers are usually paired together for a particular
 system type.
 
-A `Channel` allows the commands used to interact with an `ExecutionProvider` to be
-executed on a remote system. The default channel executes commands on the
-local system, but a few variants of an `parsl.channels.SSHChannel` are provided.
-
+Parsl also has a deprecated ``Channel`` abstraction.  See
+`issue 3515 <https://github.com/Parsl/parsl/issues/3515>`_
+for further discussion.
 
 File staging
 ------------

parsl/channels/__init__.py

@@ -3,16 +3,10 @@
 if TYPE_CHECKING:
     from parsl.channels.base import Channel
     from parsl.channels.local.local import LocalChannel
-    from parsl.channels.oauth_ssh.oauth_ssh import OAuthSSHChannel
-    from parsl.channels.ssh.ssh import SSHChannel
-    from parsl.channels.ssh_il.ssh_il import SSHInteractiveLoginChannel
 
 lazys = {
         'Channel': 'parsl.channels.base',
-        'SSHChannel': 'parsl.channels.ssh.ssh',
         'LocalChannel': 'parsl.channels.local.local',
-        'SSHInteractiveLoginChannel': 'parsl.channels.ssh_il.ssh_il',
-        'OAuthSSHChannel': 'parsl.channels.oauth_ssh.oauth_ssh',
 }
 
 import parsl.channels as px
@@ -33,4 +27,4 @@ def lazy_loader(name):
 
 px.__getattr__ = lazy_loader  # type: ignore[method-assign]
 
-__all__ = ['Channel', 'SSHChannel', 'LocalChannel', 'SSHInteractiveLoginChannel', 'OAuthSSHChannel']
+__all__ = ['Channel', 'LocalChannel']

parsl/channels/oauth_ssh/oauth_ssh.py

@@ -3,7 +3,7 @@
 
 import paramiko
 
-from parsl.channels.ssh.ssh import SSHChannel
+from parsl.channels.ssh.ssh import DeprecatedSSHChannel
 from parsl.errors import OptionalModuleMissing
 
 try:
@@ -17,7 +17,7 @@
 logger = logging.getLogger(__name__)
 
 
-class OAuthSSHChannel(SSHChannel):
+class DeprecatedOAuthSSHChannel(DeprecatedSSHChannel):
     """SSH persistent channel. This enables remote execution on sites
     accessible via ssh. This channel uses Globus based OAuth tokens for authentication.
     """

parsl/channels/ssh/ssh.py

@@ -24,7 +24,7 @@ def _auth(self, username, *args):
         return
 
 
-class SSHChannel(Channel, RepresentationMixin):
+class DeprecatedSSHChannel(Channel, RepresentationMixin):
     ''' SSH persistent channel. This enables remote execution on sites
     accessible via ssh. It is assumed that the user has setup host keys
     so as to ssh to the remote host. Which goes to say that the following

parsl/channels/ssh_il/ssh_il.py

@@ -3,12 +3,12 @@
 
 import paramiko
 
-from parsl.channels.ssh.ssh import SSHChannel
+from parsl.channels.ssh.ssh import DeprecatedSSHChannel
 
 logger = logging.getLogger(__name__)
 
 
-class SSHInteractiveLoginChannel(SSHChannel):
+class DeprecatedSSHInteractiveLoginChannel(DeprecatedSSHChannel):
     """SSH persistent channel. This enables remote execution on sites
     accessible via ssh. This channel supports interactive login and is appropriate when
     keys are not set up.