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Merge pull request #8844 from jacquesqiao/add-timeling-profile-howto
add timeline profile howto
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## how to use timeline tool to do profile | ||
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1. Add `with profiler.profiler(...)` to the main training loop. After run, the code will generate a profile record file `/tmp/profile`. **Warning**: Please do not run too many batches when use profiler to record timeline information, for the profile record will grow with the batch number. | ||
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```python | ||
with profiler.profiler('All', 'total', '/tmp/profile') as prof: | ||
for pass_id in range(pass_num): | ||
for batch_id, data in enumerate(train_reader()): | ||
exe.run(fluid.default_main_program(), | ||
feed=feeder.feed(data), | ||
fetch_list=[], | ||
use_program_cache=True) | ||
... | ||
``` | ||
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1. Run `python paddle/tools/timeline.py` to process `/tmp/profile`, it will generate another | ||
file `/tmp/timeline` by default. You can change the path by cmd parameter, please take a look at | ||
[timeline.py](https://github.com/PaddlePaddle/Paddle/blob/develop/tools/timeline.py) for details. | ||
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1. Open chrome and visit <chrome://tracing/>, use `load` button to load the generated `timeline` file. | ||
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![chrome tracing](./tracing.jpeg) | ||
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1. The resulting timeline should be like: | ||
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![chrome timeline](./timeline.jpeg) |
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