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体验新版 GitCode,发现更多精彩内容 >>
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64824ac7
编写于
8月 13, 2018
作者:
C
chengduo
提交者:
GitHub
8月 13, 2018
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电子邮件补丁
差异文件
Add write after write dependence (#12632)
* Add write after write * follow comment
上级
29fac3c0
变更
1
隐藏空白更改
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并排
Showing
1 changed file
with
18 addition
and
3 deletion
+18
-3
paddle/fluid/framework/ir/graph.cc
paddle/fluid/framework/ir/graph.cc
+18
-3
未找到文件。
paddle/fluid/framework/ir/graph.cc
浏览文件 @
64824ac7
...
...
@@ -182,9 +182,11 @@ Graph::Graph(const ProgramDesc &program) : program_(program) {
}
/**
* We only handle write after read(WAR), since it should not have a write
* after write in program. If there are write after write operators, we need
* prune them.
* We should handle write after read(WAR) and write after write(WAW) here.
* Because some of the operators of the program can be executed parallelly.
* So, to make the program running in the right order, we should add the
* dependence of WAR and WAW.
*
*
* https://en.wikipedia.org/wiki/Hazard_(computer_architecture)#Write_after_read_(WAR)
*/
...
...
@@ -201,6 +203,19 @@ Graph::Graph(const ProgramDesc &program) : program_(program) {
(
*
it_new
)
->
inputs
.
empty
()
?
nullptr
:
(
*
it_new
)
->
inputs
[
0
];
const
auto
&
read_ops
=
(
*
it_old
)
->
outputs
;
PADDLE_ENFORCE
(
write_op
,
"The write_op should not be empty."
);
// Add write after write dependence
ir
::
Node
*
upstream_op
=
(
*
it_old
)
->
inputs
.
empty
()
?
nullptr
:
(
*
it_old
)
->
inputs
[
0
];
if
(
upstream_op
)
{
ir
::
Node
*
dep_var
=
CreateControlDepVar
();
write_op
->
inputs
.
push_back
(
dep_var
);
upstream_op
->
outputs
.
push_back
(
dep_var
);
dep_var
->
outputs
.
push_back
(
write_op
);
dep_var
->
inputs
.
push_back
(
upstream_op
);
}
for
(
auto
*
read_op
:
read_ops
)
{
// Manually add a dependency var from read_op to write_op;
if
(
read_op
==
write_op
)
{
...
...
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