test: deflake gc-http-client tests by restricting number of requests

sequential/test-gc-http-client tests were sometimes failing due to
a non-deterministic number of requests being created, causing the
test to fail on some systems with a "ECONNRESET" error cause by
too many concurrent connections

Fixes: nodejs#43638

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

@@ -15,6 +15,7 @@ function serverHandler(req, res) {
 }
 
 const http = require('http');
+let callsPerCPU = 36;
 let createClients = true;
 let done = 0;
 let count = 0;
@@ -23,22 +24,26 @@ let countGC = 0;
 const server = http.createServer(serverHandler);
 server.listen(0, common.mustCall(() => {
   for (let i = 0; i < cpus; i++)
-    getAll();
+    getAll(callsPerCPU);
 }));
 
-function getAll() {
-  if (createClients) {
-    const req = http.get({
-      hostname: 'localhost',
-      pathname: '/',
-      port: server.address().port
-    }, cb).on('error', onerror);
+function getAll(remainingCalls) {
+  if (!createClients)
+    return;
 
-    count++;
-    onGC(req, { ongc });
+  if (remainingCalls <= 0)
+    return;
 
-    setImmediate(getAll);
-  }
+  const req = http.get({
+    hostname: 'localhost',
+    pathname: '/',
+    port: server.address().port
+  }, cb).on('error', onerror);
+
+  count++;
+  onGC(req, { ongc });
+
+  setImmediate(() => getAll(remainingCalls - 1));
 }
 
 function cb(res) {

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

@@ -17,6 +17,7 @@ function serverHandler(req, res) {
 }
 
 const cpus = os.cpus().length;
+let callsPerCPU = 36;
 let createClients = true;
 let done = 0;
 let count = 0;
@@ -25,10 +26,13 @@ let countGC = 0;
 const server = http.createServer(serverHandler);
 server.listen(0, common.mustCall(getAll));
 
-function getAll() {
+function getAll(remainingCalls) {
   if (!createClients)
     return;
 
+  if (remainingCalls <= 0)
+    return;
+
   const req = http.get({
     hostname: 'localhost',
     pathname: '/',
@@ -40,11 +44,11 @@ function getAll() {
   count++;
   onGC(req, { ongc });
 
-  setImmediate(getAll);
+  setImmediate(() => getAll(remainingCalls - 1));
 }
 
 for (let i = 0; i < cpus; i++)
-  getAll();
+  getAll(callsPerCPU);
 
 function cb(res) {
   res.resume();

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

@@ -13,6 +13,7 @@ function serverHandler(req, res) {
 }
 
 const http = require('http');
+let callsPerCPU = 36;
 let createClients = true;
 let done = 0;
 let count = 0;
@@ -21,13 +22,16 @@ let countGC = 0;
 const server = http.createServer(serverHandler);
 server.listen(0, common.mustCall(() => {
   for (let i = 0; i < cpus; i++)
-    getAll();
+    getAll(callsPerCPU);
 }));
 
-function getAll() {
+function getAll(remainingCalls) {
   if (!createClients)
     return;
 
+  if (remainingCalls <= 0)
+    return;
+
   const req = http.get({
     hostname: 'localhost',
     pathname: '/',
@@ -37,7 +41,7 @@ function getAll() {
   count++;
   onGC(req, { ongc });
 
-  setImmediate(getAll);
+  setImmediate(() => getAll(remainingCalls - 1));
 }
 
 function cb(res) {