dns-suite.js/node_modules/qap/bench/best-magic-data-rate-bench.js

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2017-01-14 02:04:27 +00:00
var log = console.log
, dlength = 700
, stime = 0
, boundary = new Buffer( 57 )
// build test data to parse
, data = ( function () {
var test = new Buffer( dlength * 1024 * 1024)
, t = 0
, tlen = test.length
;
log( '- now building a %d GB test buffer..', ( dlength / 1024 ).toFixed( 2 ) );
for ( ; ++t < tlen; ) {
test[ t ] = t % 256;
}
log( '- test buffer created..' );
return test;
} )()
// crook parse method
, magicParse = function ( pattern, data ) {
var i = 0
, dlen = data.length
, plen = pattern.length
, pchar = pattern[ plen - 1 ]
;
log( '- now parsing test buffer with magic algorithm..' );
for( stime = Date.now(); i < dlen; i += plen ) {
/*
* access data and compare current byte with the last byte of pattern,
* then skip plen bytes, no other comparison.
* best performance O(n/m)
*/
if( pchar === data[ i ] ) {
// ..
}
}
return [];
}
, results = magicParse( boundary, data )
, duration = ( Date.now() - stime )
, datarate = ( ( dlength / duration ) * ( 7.8125 ) )
;
log( '- elapsed time is; %d millis (I\'m the best!)', duration );
log( '- datarate is: %d Gbit/sec (Magic!)', ( datarate ).toFixed( 2 ) );
log( '- results: 0 found (Sorry, I\'m a crook!)' );