Properly cleanup processes and queues for MPRS and Fix pause for prefetch (#1075)
#1096
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…efetch (pytorch#1075) Summary: Fixes issue about `MPRS.finalize` when `dataloader2.shutdown()` is called ### Changes - DataLoader2 should always clean up `datapipe_iter` at shutdown - Guard `MPRS` to finalize once - Fix the problem of `ConnectionError` when DataLoader early exits - This is caused by `queue` is joined when main/worker/dispatching process exits. No more request/response can be passed across processes. - Consumer process shouldn't join the `req_queue` at exit to make sure producer process can still access the remaining request. And, consumer will close `req_queue` after clean up to prevent any further request sent to queue. - Produce process shouldn't join the `res_queue` at exit to make sure consumer process can still access response. And, producer will close `res_queue` after clean up to prevent any further response sent to queue. - Main (Consumer) <-> Worker (Producer) - Worker (Consumer) -> Dispatching (Producer) - Fix `pause` API for DataLoader2 - Invoke `pause` lazily until the `limit+1` iteration is reached to align with python's iterator behavior. - Make `prefetch.pause` blocking unless there might be potential racing issue. Main thread is paused but prefetch worker is still trying to fetch data from `iter`. - Add tests to validate Pull Request resolved: pytorch#1075 Differential Revision: D44168655 Pulled By: ejguan fbshipit-source-id: 4fa8c34438414cad7f46527355eb0d51866e6b15
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This pull request was exported from Phabricator. Differential Revision: D44168655 |
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This is the reland of #1075. To fix the internal test failures, I have to remove the optional |
NivekT
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Mar 17, 2023
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…efetch (#1096) Summary: Pull Request resolved: #1096 Fixes issue about `MPRS.finalize` when `dataloader2.shutdown()` is called ### Changes - DataLoader2 should always clean up `datapipe_iter` at shutdown - Guard `MPRS` to finalize once - Fix the problem of `ConnectionError` when DataLoader early exits - This is caused by `queue` is joined when main/worker/dispatching process exits. No more request/response can be passed across processes. - Consumer process shouldn't join the `req_queue` at exit to make sure producer process can still access the remaining request. And, consumer will close `req_queue` after clean up to prevent any further request sent to queue. - Produce process shouldn't join the `res_queue` at exit to make sure consumer process can still access response. And, producer will close `res_queue` after clean up to prevent any further response sent to queue. - Main (Consumer) <-> Worker (Producer) - Worker (Consumer) -> Dispatching (Producer) - Fix `pause` API for DataLoader2 - Invoke `pause` lazily until the `limit+1` iteration is reached to align with python's iterator behavior. - Make `prefetch.pause` blocking unless there might be potential racing issue. Main thread is paused but prefetch worker is still trying to fetch data from `iter`. - Add tests to validate Pull Request resolved: #1075 Reviewed By: NivekT Differential Revision: D44168655 Pulled By: ejguan fbshipit-source-id: fdfee5c27b512b5c0d5308e53a81b1cb2db70a43
ejguan
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Apr 20, 2023
…efetch (#1096) Summary: Pull Request resolved: #1096 Fixes issue about `MPRS.finalize` when `dataloader2.shutdown()` is called ### Changes - DataLoader2 should always clean up `datapipe_iter` at shutdown - Guard `MPRS` to finalize once - Fix the problem of `ConnectionError` when DataLoader early exits - This is caused by `queue` is joined when main/worker/dispatching process exits. No more request/response can be passed across processes. - Consumer process shouldn't join the `req_queue` at exit to make sure producer process can still access the remaining request. And, consumer will close `req_queue` after clean up to prevent any further request sent to queue. - Produce process shouldn't join the `res_queue` at exit to make sure consumer process can still access response. And, producer will close `res_queue` after clean up to prevent any further response sent to queue. - Main (Consumer) <-> Worker (Producer) - Worker (Consumer) -> Dispatching (Producer) - Fix `pause` API for DataLoader2 - Invoke `pause` lazily until the `limit+1` iteration is reached to align with python's iterator behavior. - Make `prefetch.pause` blocking unless there might be potential racing issue. Main thread is paused but prefetch worker is still trying to fetch data from `iter`. - Add tests to validate Pull Request resolved: #1075 Reviewed By: NivekT Differential Revision: D44168655 Pulled By: ejguan fbshipit-source-id: fdfee5c27b512b5c0d5308e53a81b1cb2db70a43
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Summary:
Fixes issue about
MPRS.finalizewhendataloader2.shutdown()is calledChanges
datapipe_iterat shutdownMPRSto finalize onceConnectionErrorwhen DataLoader early exitsqueueis joined when main/worker/dispatching process exits. No more request/response can be passed across processes.req_queueat exit to make sure producer process can still access the remaining request. And, consumer will closereq_queueafter clean up to prevent any further request sent to queue.res_queueat exit to make sure consumer process can still access response. And, producer will closeres_queueafter clean up to prevent any further response sent to queue.pauseAPI for DataLoader2Invoke(Breaking internal tests)pauselazily until thelimit+1iteration is reached to align with python's iterator behavior.prefetch.pauseblocking unless there might be potential racing issue. Main thread is paused but prefetch worker is still trying to fetch data fromiter.Pull Request resolved: #1075
Differential Revision: D44168655
Pulled By: ejguan