benchmark: cleanup child_process IPC benchmark

Squashed from: - child_process: fix IPC bench to obey send() ret val - child_process: fix IPC benchmark message has two more bytes - child_process: use setImmediate for IPC bench PR-URL: #10557 Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>

Author: ypresto

benchmark/child_process/child-process-read-ipc.js

@@ -1,14 +1,20 @@
 'use strict';
 if(process.argv[2]==='child'){
 constlen=+process.argv[3];
-constmsg=`"${'.'.repeat(len)}"`;
-while(true){
-process.send(msg);
-}
+constmsg='.'.repeat(len);
+constsend=()=>{
+while(process.send(msg));
+// Wait: backlog of unsent messages exceeds threshold
+setImmediate(send);
+};
+send();
 }else{
 constcommon=require('../common.js');
 constbench=common.createBenchmark(main,{
-len: [64,256,1024,4096,32768],
+len: [
+64,256,1024,4096,16384,65536,
+65536<<4,65536<<8
+],
 dur: [5]
 });
 constspawn=require('child_process').spawn;
@@ -18,7 +24,7 @@ if (process.argv[2] === 'child'){
 constdur=+conf.dur;
 constlen=+conf.len;
 
-constoptions={'stdio': ['ignore','ignore','ignore','ipc']};
+constoptions={'stdio': ['ignore',1,2,'ipc']};
 constchild=spawn(process.argv[0],
 [process.argv[1],'child',len],options);
 
@@ -29,8 +35,7 @@ if (process.argv[2] === 'child'){
 
 setTimeout(function(){
 child.kill();
-constgbits=(bytes*8)/(1024*1024*1024);
-bench.end(gbits);
+bench.end(bytes);
 },dur*1000);
 }
 }