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Update parallel_executor.md (#9959)

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dzhwinter 7 years ago committed by GitHub
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doc/fluid/design/concepts/parallel_executor.md
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@ -84,7 +84,7 @@ Running an operator can be asynchronized. There is a thread pool to execute an `
## Synchronize GPU Kernels
The GPU is a non-blocking device. The different streams need be synchronized when switing streams. In current implementation, the synchronization based on the following algorithm:
The GPU is a non-blocking device. The different streams need be synchronized when switching streams. In current implementation, the synchronization based on the following algorithm:
1. `OpHandle` will record `DeviceContext` that it is used.
2. In `OpHandle::Run`, if the `DeviceContext` of current operator is different from `DeviceContext` of any input variable, just wait the generate operator of this input variable.

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