On my mac I don't see big improvements

```bash
avidela:php-amqplib avidela$ make benchmark
Publishing 4000 msgs with 1KB of content:
php benchmark/producer.php 4000
1.3181440830231
Consuming 4000:
php benchmark/consumer.php
Pid: 99406, Count: 4000, Time: 1.5973
Stream produce 100:
php benchmark/stream_tmp_produce.php 100
1.0506529808044
Socket produce 100:
php benchmark/socket_tmp_produce.php 100
0.98525595664978
avidela:php-amqplib avidela$ make benchmark
Publishing 4000 msgs with 1KB of content:
php benchmark/producer.php 4000
1.3310830593109
Consuming 4000:
php benchmark/consumer.php
Pid: 6562, Count: 4000, Time: 1.5368
Stream produce 100:
php benchmark/stream_tmp_produce.php 100
1.0186810493469
Socket produce 100:
php benchmark/socket_tmp_produce.php 100
1.0140619277954
avidela:php-amqplib avidela$ 
```