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Test case for c10d DDP#9670

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Test case for c10d DDP#9670
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goldsborough:c10-ddp-test

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@goldsborough goldsborough commented Jul 21, 2018 •
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Before I can rewrite portions of the c10d DDP in C++ I need proper tests in place to make sure I am not breaking anything as I port code. There were no tests for the c10d DDP in place so I wrote some.

I refactored the c10d tests to derive some tests cases from a general MultiGPUTestCase and followed lots of patterns from test_distributed.py w.r.t. how tests are skipped (such that the main process doesn't initialize CUDA, which I found is a super important detail!!!).

I am largely unfamiliar with this code so feel free to scrutinize. The DDP test code itself is also largely taken from test_distributed.py but more inlined which I find easier to read.

Test Plan:

  1. Ran gloo backend tests successfully on my devgpu
  2. Ran NCCL (and gloo) backend tests on devfair successfully.

@apaszke @pietern @teng-li

ssnl
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soumith commented Jul 21, 2018

@pytorchbot retest this please

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ezyang commented Jul 23, 2018

test failures look real

05:04:25 ======================================================================
05:04:25 FAIL: test_nccl_backend (__main__.DistributedDataParallelTest)
05:04:25 ----------------------------------------------------------------------
05:04:25 Traceback (most recent call last):
05:04:25   File "test_c10d.py", line 190, in wrapper
05:04:25     self._join_processes(fn)
05:04:25   File "test_c10d.py", line 235, in _join_processes
05:04:25     self._check_return_codes()
05:04:25   File "test_c10d.py", line 244, in _check_return_codes
05:04:25     self.assertEqual(p.exitcode, first_process.exitcode)
05:04:25   File "/var/lib/jenkins/workspace/test/common.py", line 364, in assertEqual
05:04:25     super(TestCase, self).assertEqual(x, y, message)
05:04:25 AssertionError: None != 1 :

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goldsborough commented Jul 23, 2018

@teng-li @apaszke looking for quick feedback so that I can post more PRs that need this test

apaszke
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@goldsborough has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

@avmgithub avmgithub mentioned this pull request Jul 26, 2018
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jramseyer pushed a commit to jramseyer/pytorch that referenced this pull request Jul 30, 2018
@goldsborough @jramseyer
Test case for c10d DDP (pytorch#9670)
c411c95 
Summary:
Before I can rewrite portions of the c10d DDP in C++ I need proper tests in place to make sure I am not breaking anything as I port code. There were no tests for the c10d DDP in place so I wrote some.

I refactored the c10d tests to derive some tests cases from a general `MultiGPUTestCase` and followed lots of patterns from `test_distributed.py` w.r.t. how tests are skipped (such that the main process doesn't initialize CUDA, which I found is a super important detail!!!).

I am largely unfamiliar with this code so feel free to scrutinize. The DDP test code itself is also largely taken from `test_distributed.py` but more inlined which I find easier to read.
Pull Request resolved: pytorch#9670

Differential Revision: D8977724

Pulled By: goldsborough

fbshipit-source-id: 186eab38a72384d7992a2ec5c89f304ad42d5944
facebook-github-bot pushed a commit that referenced this pull request Aug 1, 2018
@goldsborough @facebook-github-bot
Move DDP broadcast coalesced to C++ (#9729)
7d2bda7 
Summary:
This PR depends on the tests added in #9670. It moves the first, tiny function from the c10d DDP to C++: `dist_broadcast_coalesced`. Let me know if ` torch/csrc/distributed/c10d/ddp.h` will be a good place to put these rewritten functions.

pietern The controller you requested could not be found. apaszke
Pull Request resolved: #9729

Differential Revision: D8985308

Pulled By: goldsborough

fbshipit-source-id: dc459fe9040273714044152063585e746974752f
goodlux pushed a commit to goodlux/pytorch that referenced this pull request Aug 15, 2018
@goldsborough
Test case for c10d DDP (pytorch#9670)
811d1c4 
Summary:
Before I can rewrite portions of the c10d DDP in C++ I need proper tests in place to make sure I am not breaking anything as I port code. There were no tests for the c10d DDP in place so I wrote some.

I refactored the c10d tests to derive some tests cases from a general `MultiGPUTestCase` and followed lots of patterns from `test_distributed.py` w.r.t. how tests are skipped (such that the main process doesn't initialize CUDA, which I found is a super important detail!!!).

I am largely unfamiliar with this code so feel free to scrutinize. The DDP test code itself is also largely taken from `test_distributed.py` but more inlined which I find easier to read.
Pull Request resolved: pytorch#9670

Differential Revision: D8977724

Pulled By: goldsborough

fbshipit-source-id: 186eab38a72384d7992a2ec5c89f304ad42d5944
goodlux pushed a commit to goodlux/pytorch that referenced this pull request Aug 15, 2018
@goldsborough
Move DDP broadcast coalesced to C++ (pytorch#9729)
838a2ed 
Summary:
This PR depends on the tests added in pytorch#9670. It moves the first, tiny function from the c10d DDP to C++: `dist_broadcast_coalesced`. Let me know if ` torch/csrc/distributed/c10d/ddp.h` will be a good place to put these rewritten functions.

pietern The controller you requested could not be found. apaszke
Pull Request resolved: pytorch#9729

Differential Revision: D8985308

Pulled By: goldsborough

fbshipit-source-id: dc459fe9040273714044152063585e746974752f
@ezyang ezyang added the merged label Jun 26, 2019
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