benchmark: add bench for zlib gzip + gunzip cycle

Originally wrote this for some work that is going to take a while
longer before it’s ready to be PR’ed, so it seems fine to start
with this on its own.
PR-URL: #20034
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: addaleax

benchmark/zlib/pipe.js

@@ -0,0 +1,39 @@
+'use strict';
+constcommon=require('../common.js');
+constfs=require('fs');
+constzlib=require('zlib');
+
+constbench=common.createBenchmark(main,{
+inputLen: [1024],
+duration: [5],
+type: ['string','buffer']
+});
+
+functionmain({ inputLen, duration, type }){
+constbuffer=Buffer.alloc(inputLen,fs.readFileSync(__filename));
+constchunk=type==='buffer' ? buffer : buffer.toString('utf8');
+
+constinput=zlib.createGzip();
+constoutput=zlib.createGunzip();
+
+letreadFromOutput=0;
+input.pipe(output);
+if(type==='string')
+output.setEncoding('utf8');
+output.on('data',(chunk)=>readFromOutput+=chunk.length);
+
+functionwrite(){
+input.write(chunk,write);
+}
+
+bench.start();
+write();
+
+setTimeout(()=>{
+// Give result in GBit/s, like the net benchmarks do
+bench.end(readFromOutput*8/(1024**3));
+
+// Cut off writing the easy way.
+input.write=()=>{};
+},duration*1000);
+}

test/parallel/test-benchmark-zlib.js

@@ -9,5 +9,10 @@ runBenchmark('zlib',
 'method=deflate',
 'n=1',
 'options=true',
-'type=Deflate'
-]);
+'type=Deflate',
+'inputLen=1024',
+'duration=0.001'
+],
+{
+'NODEJS_BENCHMARK_ZERO_ALLOWED': 1
+});