big-pattern-memory-usage-bench.js

var log = console.log
    , t = require( './tables' )
    // stuff 
    , mb = 20
    , msg = log( '- building and pre-processing a very big pattern.. (%dMB)', mb )
    , smem = process.memoryUsage()
    , bp = new Buffer( 1024 * 1024 * mb )
    , emem0 = process.memoryUsage()
    , bc = t.bcTable( bp )
    , emem1 = process.memoryUsage()
    , suff = t.suffixes( bp )
    , emem2 = process.memoryUsage()
    , gs = t.gsTable( suff )
    , emem3 = process.memoryUsage()
    // output results
    , output = function ( n, e, s, t ) {
        log( '- %s length is %s', n, t );
        log( '- %s mem usage is %d KBytes', n, ( ( e.rss - s.rss ) / 1024 ).toFixed( 1 ) );
        log( '- %s heap usage is %d KBytes', n, ( ( e.heapUsed - s.heapUsed ) / 1024 ).toFixed( 1 ) );
        log( '- %s avg mem usage per element is %d bytes', n, ( ( e.rss - s.rss ) / t ).toFixed( 1 ) );
    }
    ;

output( '[bc]', emem1, emem0, bc.length );
output( '[suff]', emem2, emem1, suff.length );
output( '[gs]', emem3, emem2, gs.length );