benchmark: add fs warmup to writefile-promises

brunocroh · RafaelGSS · commit 848e49c20b36 · 2025-08-12T09:19:57.000-03:00
PR-URL: #59215 Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
diff --git a/benchmark/fs/writefile-promises.js b/benchmark/fs/writefile-promises.js
@@ -39,8 +39,17 @@ function main({ encodingType, duration, concurrent, size }) {
 let writes = 0;
 let waitConcurrent = 0;
 
- const startedAt = Date.now();
- const endAt = startedAt + (duration * 1000);
+ let startedAt = Date.now();
+ let endAt = startedAt + duration * 1000;
+
+ // fs warmup
+ for (let i = 0; i < concurrent; i++) write();
+
+ writes = 0;
+ waitConcurrent = 0;
+
+ startedAt = Date.now();
+ endAt = startedAt + duration * 1000;
 
 bench.start();
 
@@ -59,7 +68,8 @@ function main({ encodingType, duration, concurrent, size }) {
 }
 
 function write() {
- fs.promises.writeFile(`${filename}-${filesWritten++}`, chunk, encoding)
+ fs.promises
+ .writeFile(`${filename}-${filesWritten++}`, chunk, encoding)
 .then(() => afterWrite())
 .catch((err) => afterWrite(err));
 }
@@ -72,7 +82,7 @@ function main({ encodingType, duration, concurrent, size }) {
 writes++;
 const benchEnded = Date.now() >= endAt;
 
- if (benchEnded && (++waitConcurrent) === concurrent) {
+ if (benchEnded && ++waitConcurrent === concurrent) {
 stop();
 } else if (!benchEnded) {
 write();

-Original file line number
+Diff line change
 letwrites=0;
 letwaitConcurrent=0;
 -conststartedAt=Date.now();
 -constendAt=startedAt+(duration*1000);
 +letstartedAt=Date.now();
 +letendAt=startedAt+duration*1000;
++
 +// fs warmup
 +for(leti=0;i<concurrent;i++)write();
++
 +writes=0;
 +waitConcurrent=0;
++
 +startedAt=Date.now();
 +endAt=startedAt+duration*1000;
 bench.start();
+}
 functionwrite(){
 -fs.promises.writeFile(`${filename}-${filesWritten++}`,chunk,encoding)
 +fs.promises
 +.writeFile(`${filename}-${filesWritten++}`,chunk,encoding)
 .then(()=>afterWrite())
 .catch((err)=>afterWrite(err));
+}
 writes++;
 constbenchEnded=Date.now()>=endAt;
 -if(benchEnded&&(++waitConcurrent)===concurrent){
 +if(benchEnded&&++waitConcurrent===concurrent){
 stop();
 }elseif(!benchEnded){
 write();