zlib: improve performance

PR-URL: nodejs#13322
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

benchmark/zlib/creation.js

@@ -0,0 +1,32 @@
+'use strict';
+var common = require('../common.js');
+var zlib = require('zlib');
+
+var bench = common.createBenchmark(main, {
+  type: [
+    'Deflate', 'DeflateRaw', 'Inflate', 'InflateRaw', 'Gzip', 'Gunzip', 'Unzip'
+  ],
+  options: ['true', 'false'],
+  n: [5e5]
+});
+
+function main(conf) {
+  var n = +conf.n;
+  var fn = zlib['create' + conf.type];
+  if (typeof fn !== 'function')
+    throw new Error('Invalid zlib type');
+  var i = 0;
+
+  if (conf.options === 'true') {
+    var opts = {};
+    bench.start();
+    for (; i < n; ++i)
+      fn(opts);
+    bench.end(n);
+  } else {
+    bench.start();
+    for (; i < n; ++i)
+      fn();
+    bench.end(n);
+  }
+}

benchmark/zlib/deflate.js

@@ -0,0 +1,54 @@
+'use strict';
+var common = require('../common.js');
+var zlib = require('zlib');
+
+var bench = common.createBenchmark(main, {
+  method: ['createDeflate', 'deflate', 'deflateSync'],
+  inputLen: [1024],
+  n: [4e5]
+});
+
+function main(conf) {
+  var n = +conf.n;
+  var method = conf.method;
+  var chunk = Buffer.alloc(+conf.inputLen, 'a');
+
+  var i = 0;
+  switch (method) {
+    // Performs `n` writes for a single deflate stream
+    case 'createDeflate':
+      var deflater = zlib.createDeflate();
+      deflater.resume();
+      deflater.on('finish', () => {
+        bench.end(n);
+      });
+
+      bench.start();
+      (function next() {
+        if (i++ === n)
+          return deflater.end();
+        deflater.write(chunk, next);
+      })();
+      break;
+    // Performs `n` single deflate operations
+    case 'deflate':
+      var deflate = zlib.deflate;
+      bench.start();
+      (function next(err, result) {
+        if (i++ === n)
+          return bench.end(n);
+        deflate(chunk, next);
+      })();
+      break;
+    // Performs `n` single deflateSync operations
+    case 'deflateSync':
+      var deflateSync = zlib.deflateSync;
+      bench.start();
+      for (; i < n; ++i)
+        deflateSync(chunk);
+      bench.end(n);
+      break;
+    default:
+      throw new Error('Unsupported deflate method');
+  }
+}