镜像站点 · 本页由第三方 GitHub 只读镜像提供，非 GitHub 官方站点，不接受任何登录或凭据输入。前往 github.com
Skip to content

stream: avoid tick in writable hot path #49966

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
nodejs-github-bot merged 1 commit into from
Oct 1, 2023
Merged

stream: avoid tick in writable hot path #49966

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
28 changes: 19 additions & 9 deletions lib/internal/streams/writable.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -612,24 +612,31 @@ function onwrite(stream, er) {
}

if (sync) {
const needDrain = state.length === 0 && (state.state & kNeedDrain) !== 0;
const needTick = needDrain || (state.state & kDestroyed !== 0) || cb !== nop;

// 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 (cb === nop) {
if ((state.state & kAfterWritePending) === 0) {
if ((state.state & kAfterWritePending) === 0 && needTick) {
process.nextTick(afterWrite, stream, state, 1, cb);
state.state |= kAfterWritePending;
} else {
state.pendingcb -= 1;
state.pendingcb--;
finishMaybe(stream, state, true);
}
} else if (state.afterWriteTickInfo !== null &&
state.afterWriteTickInfo.cb === cb) {
state.afterWriteTickInfo.count++;
} else if ((state.state & kAfterWriteTickInfo) !== 0 &&
state[kAfterWriteTickInfoValue].cb === cb) {
state[kAfterWriteTickInfoValue].count++;
} else if (needTick) {
state[kAfterWriteTickInfoValue] = { count: 1, cb, stream, state };
process.nextTick(afterWriteTick, state[kAfterWriteTickInfoValue]);
state.state |= (kAfterWritePending | kAfterWriteTickInfo);
} else {
state.afterWriteTickInfo = { count: 1, cb, stream, state };
process.nextTick(afterWriteTick, state.afterWriteTickInfo);
state.state |= kAfterWritePending;
state.pendingcb--;
finishMaybe(stream, state, true);
}
} else {
afterWrite(stream, state, 1, cb);
Expand All @@ -638,7 +645,8 @@ function onwrite(stream, er) {
}

function afterWriteTick({ stream, state, count, cb }) {
state.afterWriteTickInfo = null;
Comment thread
ronag marked this conversation as resolved.
Outdated
state.state &= ~kAfterWriteTickInfo;
state[kAfterWriteTickInfoValue] = null;
return afterWrite(stream, state, count, cb);
}

Expand Down Expand Up @@ -795,6 +803,8 @@ Writable.prototype.end = function(chunk, encoding, cb) {
if (typeof cb === 'function') {
if (err) {
process.nextTick(cb, err);
} else if ((state.state & kErrored) !== 0) {
process.nextTick(cb, state[kErroredValue]);
} else if ((state.state & kFinished) !== 0) {
process.nextTick(cb, null);
} else {
Expand Down