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stream: improve write performance #30736

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stream: improve write performance #30736

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32 changes: 16 additions & 16 deletions lib/_stream_writable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -493,30 +493,30 @@ function onwrite(stream, er) {
onwriteError(stream, state, er, cb);
}
} else {
// Check if we're actually ready to finish, but don't emit yet
var finished = needFinish(state) || stream.destroyed;

if (!finished &&
!state.corked &&
if (!state.corked &&
!state.bufferProcessing &&
state.bufferedRequest) {
clearBuffer(stream, state);
}

if (sync) {
// It is a common case that the callback passed to .write() is always
// the same. In that case, we do not schedule a new nextTick(), but rather
// just increase a counter, to improve performance and avoid memory
// allocations.
if (state.afterWriteTickInfo !== null &&
state.afterWriteTickInfo.cb === cb) {
state.afterWriteTickInfo.count++;
if (state.ending || state.needDrain || cb !== nop) {
if (sync) {
// It is a common case that the callback passed to .write() is always
// the same. In that case, we do not schedule a new nextTick(), but
// rather just increase a counter, to improve performance and avoid
// memory allocations.
if (state.afterWriteTickInfo !== null &&
state.afterWriteTickInfo.cb === cb) {
state.afterWriteTickInfo.count++;
} else {
state.afterWriteTickInfo = { count: 1, cb, stream, state };
process.nextTick(afterWriteTick, state.afterWriteTickInfo);
}
} else {
state.afterWriteTickInfo = { count: 1, cb, stream, state };
process.nextTick(afterWriteTick, state.afterWriteTickInfo);
afterWrite(stream, state, 1, cb);
}
} else {
afterWrite(stream, state, 1, cb);
state.pendingcb--;
}
}
}
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