initial

node_modules/onoff/test/performance-async.js

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+"use strict";
+
+const Gpio = require('../onoff').Gpio;
+
+const pulseLed = (led, pulseCount, cb) => {
+  let time = process.hrtime();
+
+  const loop = (count) => {
+    if (count === 0) {
+      time = process.hrtime(time);
+      const writesPerSecond = pulseCount * 2 / (time[0] + time[1] / 1E9);
+      return cb(null, writesPerSecond);
+    }
+
+    led.write(1, (err) => {
+      if (err) {
+        return cb(err);
+      }
+
+      led.write(0, (err) => {
+        if (err) {
+          return cb(err);
+        }
+
+        loop(count - 1);
+      });
+    });
+  };
+
+  loop(pulseCount);
+};
+
+const asyncWritesPerSecond = (cb) => {
+  const led = new Gpio(17, 'out');
+  let writes = 0;
+
+  const loop = (count) => {
+    if (count === 0) {
+      led.unexport();
+      return cb(null, writes / 10);
+    }
+
+    pulseLed(led, 10000, (err, writesPerSecond) => {
+      if (err) {
+        return cb(err);
+      }
+
+      writes += writesPerSecond;
+
+      loop(count - 1);
+    });
+  };
+
+  // Do a dry run first to get the runtime primed
+  pulseLed(led, 5000, (err, writesPerSecond) => {
+    if (err) {
+      return cb(err);
+    }
+    loop(10);
+  });
+};
+
+asyncWritesPerSecond((err, averageWritesPerSecond) => {
+  if (err) {
+    throw err;
+  }
+
+  console.log('ok - ' + __filename);
+  console.log(
+    '     ' + Math.floor(averageWritesPerSecond) + ' async writes per second'
+  );
+});
+