PHP vs PHP-CPP vs HHVM-HNI

gistfile1.md

#PHP vs PHP-CPP vs HHVM-HNI This is a small benchmark with the objective of compare the performance of PHP-CPP vs HNI.

Code

$a = [
    'key' => 'foo',
    'foo' => null,
    'a' => 2,
    'b' => 2.2,
    'c' => ['foo' => 2],
    'd' => ['foo']
];

for($i=0;$i<100000;$i++) {
    bson_decode(bson_encode($a));
}

Results

The code was executed in three setups at the same system.

PHP

Under PHP 5.5.10 with 1.5.1 mongo extension, the native extension don't use libbson so the implementation is very different from the other two.

real 0m0.214s

HHVM-HNI

Under HHVM 3.01 with bson-hni extension, basicaly is a wrapper of libbson

real 0m0.504s

PHP-CPP

Under the same PHP version of the native one with the bson-php-cpp extension, the same bson-hni code ported to PHP-CPP

real 0m1.815s

Can you please interpret this real 0m0.214s?