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未验证 提交 8447da90 编写于 作者: Z Zhang Ting 提交者： GitHub
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fix the code example and the output of profile, test=develop (#2129)

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doc/fluid/advanced_guide/performance_improving/device_switching/device_switching.md
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......@@ -59,6 +59,7 @@ result = exe.run(fluid.default_main_program(), fetch_list=[avg_cost])
```python
import paddle.fluid as fluid
import paddle.fluid.compiler as compiler
import paddle.fluid.profiler as profiler
data1 = fluid.layers.fill_constant(shape=[1, 3, 8, 8], value=0.5, dtype='float32')
......@@ -69,9 +70,10 @@ out = fluid.layers.crop_tensor(data1, shape=shape)
place = fluid.CUDAPlace(0)
exe = fluid.Executor(place)
exe.run(fluid.default_startup_program())
compiled_prog = compiler.CompiledProgram(fluid.default_main_program())
with profiler.profiler('All', 'total') as prof:
for i in range(10):
result = exe.run(fetch_list=[out])
result = exe.run(program=compiled_prog, fetch_list=[out])
```
在程序运行结束后，将会自动地打印出profile report。在下面的profile report中，可以看到 `GpuMemCpy Summary`中给出了2项数据传输的调用耗时。在OP执行过程中，如果输入Tensor所在的设备与OP执行的设备不同，就会发生`GpuMemcpySync`，通常我们可以直接优化的就是这一项。进一步分析，可以看到`slice`和`crop_tensor`执行中都发生了`GpuMemcpySync`。尽管我们在程序中设置了GPU模式运行，但是框架中有些OP，例如shape，会将输出结果放在CPU上。
......@@ -82,35 +84,34 @@ with profiler.profiler('All', 'total') as prof:
Note! This Report merge all thread info into one.
Place: All
Time unit: ms
Sorted by event first end time in descending order in the same thread
Sorted by total time in descending order in the same thread
Total time: 24.0922
Computation time Total: 3.60143 Ratio: 14.9485%
Framework overhead Total: 20.4908 Ratio: 85.0515%
Total time: 26.6328
Computation time Total: 13.3133 Ratio: 49.9884%
Framework overhead Total: 13.3195 Ratio: 50.0116%
------------------------- GpuMemCpy Summary -------------------------
GpuMemcpy Calls: 30 Total: 1.44377 Ratio: 5.99267%
GpuMemcpyAsync Calls: 10 Total: 0.459803 Ratio: 1.90851%
GpuMemcpySync Calls: 20 Total: 0.983967 Ratio: 4.08416%
GpuMemcpy Calls: 30 Total: 1.47508 Ratio: 5.5386%
GpuMemcpyAsync Calls: 10 Total: 0.443514 Ratio: 1.66529%
GpuMemcpySync Calls: 20 Total: 1.03157 Ratio: 3.87331%
------------------------- Event Summary -------------------------
Event Calls Total CPU Time (Ratio) GPU Time (Ratio) Min. Max. Ave. Ratio.
fill_constant 20 2.03147 1.995597 (0.982342) 0.035872 (0.017658) 0.064199 0.379822 0.101573 0.0843204
shape 10 0.466503 0.466503 (1.000000) 0.000000 (0.000000) 0.021165 0.207393 0.0466503 0.0193632
eager_deletion 30 0.28398 0.283980 (1.000000) 0.000000 (0.000000) 0.004668 0.028065 0.009466 0.0117872
slice 10 1.53533 1.505664 (0.980679) 0.029664 (0.019321) 0.1312 0.259446 0.153533 0.0637271
GpuMemcpySync:CPU->GPU 10 0.41714 0.408532 (0.979364) 0.008608 (0.020636) 0.038545 0.054022 0.041714 0.0173143
crop_tensor 10 1.49584 1.438558 (0.961707) 0.057280 (0.038293) 0.129106 0.246395 0.149584 0.0620879
GpuMemcpySync:GPU->CPU 10 0.566827 0.543787 (0.959353) 0.023040 (0.040647) 0.047598 0.097705 0.0566827 0.0235274
Fetch 10 0.921333 0.897141 (0.973742) 0.024192 (0.026258) 0.077059 0.177223 0.0921333 0.0382419
GpuMemcpyAsync:GPU->CPU 10 0.459803 0.435611 (0.947386) 0.024192 (0.052614) 0.039321 0.073849 0.0459803 0.0190851
ParallelExecutor::Run 10 17.3578 17.345797 (0.999309) 0.012000 (0.000691) 0.705361 10.3389 1.73578 0.720472
InitLocalVars 1 0.084954 0.084954 (1.000000) 0.000000 (0.000000) 0.084954 0.084954 0.084954 0.0035262
ScopeBufferedMonitor::pre_local_exec_scopes_process 10 0.040771 0.040771 (1.000000) 0.000000 (0.000000) 0.003653 0.00543 0.0040771 0.00169229
FastThreadedSSAGraphExecutorPrepare 10 8.64291 8.630914 (0.998612) 0.012000 (0.001388) 0.033383 8.29818 0.864291 0.358743
ScopeBufferedMonitor::post_local_exec_scopes_process 10 0.252618 0.252618 (1.000000) 0.000000 (0.000000) 0.022696 0.041439 0.0252618 0.0104854
FastThreadedSSAGraphExecutorPrepare 10 9.16493 9.152509 (0.998645) 0.012417 (0.001355) 0.025192 8.85968 0.916493 0.344122
shape 10 8.33057 8.330568 (1.000000) 0.000000 (0.000000) 0.030711 7.99849 0.833057 0.312793
fill_constant 20 4.06097 4.024522 (0.991025) 0.036449 (0.008975) 0.075087 0.888959 0.203049 0.15248
slice 10 1.78033 1.750439 (0.983212) 0.029888 (0.016788) 0.148503 0.290851 0.178033 0.0668471
GpuMemcpySync:CPU->GPU 10 0.45524 0.446312 (0.980388) 0.008928 (0.019612) 0.039089 0.060694 0.045524 0.0170932
crop_tensor 10 1.67658 1.620542 (0.966578) 0.056034 (0.033422) 0.143906 0.258776 0.167658 0.0629515
GpuMemcpySync:GPU->CPU 10 0.57633 0.552906 (0.959357) 0.023424 (0.040643) 0.050657 0.076322 0.057633 0.0216398
Fetch 10 0.919361 0.895201 (0.973721) 0.024160 (0.026279) 0.082935 0.138122 0.0919361 0.0345199
GpuMemcpyAsync:GPU->CPU 10 0.443514 0.419354 (0.945526) 0.024160 (0.054474) 0.040639 0.059673 0.0443514 0.0166529
ScopeBufferedMonitor::post_local_exec_scopes_process 10 0.341999 0.341999 (1.000000) 0.000000 (0.000000) 0.028436 0.057134 0.0341999 0.0128413
eager_deletion 30 0.287236 0.287236 (1.000000) 0.000000 (0.000000) 0.005452 0.022696 0.00957453 0.010785
ScopeBufferedMonitor::pre_local_exec_scopes_process 10 0.047864 0.047864 (1.000000) 0.000000 (0.000000) 0.003668 0.011592 0.0047864 0.00179718
InitLocalVars 1 0.022981 0.022981 (1.000000) 0.000000 (0.000000) 0.022981 0.022981 0.022981 0.000862883
```
### 通过log查看发生数据传输的具体位置
......@@ -138,6 +139,7 @@ I0406 14:56:23.287473 17516 operator.cc:180] CUDAPlace(0) Op(crop_tensor), input
```python
import paddle.fluid as fluid
import paddle.fluid.compiler as compiler
import paddle.fluid.profiler as profiler
data1 = fluid.layers.fill_constant(shape=[1, 3, 8, 8], value=0.5, dtype='float32')
......@@ -146,13 +148,13 @@ shape = fluid.layers.shape(data2)
with fluid.device_guard("cpu"):
shape = fluid.layers.slice(shape, axes=[0], starts=[0], ends=[4])
out = fluid.layers.crop_tensor(data1, shape=shape)
place = fluid.CUDAPlace(0)
exe = fluid.Executor(place)
exe.run(fluid.default_startup_program())
compiled_prog = compiler.CompiledProgram(fluid.default_main_program())
with profiler.profiler('All', 'total') as prof:
for i in range(10):
result = exe.run(fetch_list=[out])
result = exe.run(program=compiled_prog, fetch_list=[out])
```
再次观察profile report中`GpuMemCpy Summary`的内容，可以看到`GpuMemCpySync`已经被消除。在实际的模型中，若`GpuMemCpySync` 调用耗时占比较大，并且可以通过设置`device_guard`避免，那么就能够带来一定的性能提升。
......
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