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more conservative exception watching

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This commit is contained in:
tqchen 2014-11-30 21:39:22 -08:00
parent 8cef2086f5
commit 9355f5faf2
1 changed files with 11 additions and 5 deletions
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16
src/engine_base.cc
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@ -174,8 +174,7 @@ AllReduceBase::TryAllReduce(void *sendrecvbuf_,
// if no childs, no need to reduce
if (nlink == static_cast<int>(parent_index != -1)) {
size_up_reduce = total_size;
}
}
// while we have not passed the messages out
while (true) {
// select helper
@ -184,7 +183,10 @@ AllReduceBase::TryAllReduce(void *sendrecvbuf_,
for (int i = 0; i < nlink; ++i) {
if (i == parent_index) {
if (size_down_in != total_size) {
selecter.WatchRead(links[i].sock); finished = false;
selecter.WatchRead(links[i].sock);
// only watch for exception in live channels
selecter.WatchException(links[i].sock);
finished = false;
}
if (size_up_out != total_size) {
selecter.WatchWrite(links[i].sock);
@ -193,11 +195,15 @@ AllReduceBase::TryAllReduce(void *sendrecvbuf_,
if (links[i].size_read != total_size) {
selecter.WatchRead(links[i].sock);
}
// size_write <= size_read
if (links[i].size_write != total_size) {
selecter.WatchWrite(links[i].sock); finished = false;
selecter.WatchWrite(links[i].sock);
// only watch for exception in live channels
selecter.WatchException(links[i].sock);
finished = false;
}
}
selecter.WatchException(links[i].sock);
}
// finish runing allreduce
if (finished) break;