test: simplify test-gc-http-client

Instead of sending a fixed number of requests, detect when GC has
started and stop sending requests at that point.

PR-URL: #41620
Refs: 47ecf2060343
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/sequential/test-gc-http-client.js

@@ -5,27 +5,27 @@
 const common = require('../common');
 const onGC = require('../common/ongc');
 
+const cpus = require('os').cpus().length;
+
 function serverHandler(req, res) {
   res.writeHead(200, { 'Content-Type': 'text/plain' });
   res.end('Hello World\n');
 }
 
 const http = require('http');
-const todo = 300;
+let createClients = true;
 let done = 0;
 let count = 0;
 let countGC = 0;
 
-console.log(`We should do ${todo} requests`);
-
 const server = http.createServer(serverHandler);
 server.listen(0, common.mustCall(() => {
-  for (let i = 0; i < 15; i++)
-    getall();
+  for (let i = 0; i < cpus; i++)
+    getAll();
 }));
 
-function getall() {
-  if (count === todo)
+function getAll() {
+  if (!createClients)
     return;
 
   const req = http.get({
@@ -37,7 +37,7 @@ function getall() {
   count++;
   onGC(req, { ongc });
 
-  setImmediate(getall);
+  setImmediate(getAll);
 }
 
 function cb(res) {
@@ -49,11 +49,19 @@ function ongc() {
   countGC++;
 }
 
-setInterval(status, 100).unref();
+setImmediate(status);
 
 function status() {
-  global.gc();
-  console.log('Done: %d/%d', done, todo);
-  console.log('Collected: %d/%d', countGC, count);
-  if (countGC === todo) server.close();
+  if (done > 0) {
+    createClients = false;
+    global.gc();
+    console.log(`done/collected/total: ${done}/${countGC}/${count}`);
+    if (countGC === count) {
+      server.close();
+    } else {
+      setImmediate(status);
+    }
+  } else {
+    setImmediate(status);
+  }
 }