benchmark: split Buffer.byteLength benchmark

PR-URL: #46616
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: joyeecheung

benchmark/buffers/buffer-bytelength-buffer.js

@@ -0,0 +1,22 @@
+'use strict';
+constcommon=require('../common');
+
+constbench=common.createBenchmark(main,{
+len: [2,16,256],// x16
+n: [4e6],
+});
+
+functionmain({ n, len }){
+constdata=Buffer.alloc(len*16,'a');
+constexpected=Buffer.byteLength(data,'buffer');
+letchanged=false;
+bench.start();
+for(leti=0;i<n;i++){
+constactual=Buffer.byteLength(data,'buffer');
+if(expected!==actual){changed=true;}
+}
+bench.end(n);
+if(changed){
+thrownewError('Result changed during iteration');
+}
+}

benchmark/buffers/buffer-bytelength-string.js

@@ -0,0 +1,40 @@
+'use strict';
+constcommon=require('../common');
+
+constbench=common.createBenchmark(main,{
+type: ['one_byte','two_bytes','three_bytes','four_bytes'],
+encoding: ['utf8','base64'],
+repeat: [1,2,16,256],// x16
+n: [4e6],
+});
+
+// 16 chars each
+constchars={
+one_byte: 'hello brendan!!!',
+two_bytes: 'ΰαβγδεζηθικλμνξο',
+three_bytes: '挰挱挲挳挴挵挶挷挸挹挺挻挼挽挾挿',
+four_bytes: '𠜎𠜱𠝹𠱓𠱸𠲖𠳏𠳕𠴕𠵼𠵿𠸎𠸏𠹷𠺝𠺢',
+};
+
+functiongetInput(type,repeat,encoding){
+constoriginal=(repeat===1) ? chars[type] : chars[type].repeat(repeat);
+if(encoding==='base64'){
+Buffer.from(original,'utf8').toString('base64');
+}
+returnoriginal;
+}
+
+functionmain({ n, repeat, encoding, type }){
+constdata=getInput(type,repeat,encoding);
+constexpected=Buffer.byteLength(data,encoding);
+letchanged=false;
+bench.start();
+for(leti=0;i<n;i++){
+constactual=Buffer.byteLength(data,encoding);
+if(expected!==actual){changed=true;}
+}
+bench.end(n);
+if(changed){
+thrownewError('Result changed during iteration');
+}
+}