Memory consumption on fileread

[Iczer]

I have some memory-consumption issues on fileread operation (or maybe lack understanding of process)

i read some 116Mb RSS file in to memory. Before reading script uses 20/46 Mb, after - 266/631 Mb

Why memory consumption about 2 times of original filesize and peak memory consumption about 6 times of original filesize? Isn't it too mach? How i can reduce it?

 

_____MEMWrite(@ScriptLineNumber)

        $hXMLsource =   FileOpen($sXMLsourcePath,128)
        $sXMLsource =   FileRead($hXMLsource)
                        FileSetPos($hXMLsource,0,0)
        $RSS_FeedHead = FileRead($hXMLsource,4096)
                        FileClose($hXMLsource)

        $RSS_FeedBottom = "</rss>"

        _____MEMWrite(@ScriptLineNumber)

$RSS_FeedHead = StringLeft($RSS_FeedHead, StringInStr($RSS_FeedHead, "<Items>", 0, 1, 1) - 3)
$RSS_FeedBody = StringRegExp($sXMLsource, '(?s)(\h+\x3cItems\x3e.*?\x3c\x2fItems\x3e)', 3)

 

 

Func _____MEMWrite($iLN)
    $m = ProcessGetStats()
    ConsoleWrite("------------> Line "&$iLN&" memory = "&Round($m[0]/1000000,0)&"/"&Round($m[1]/1000000,0)&@crlf)
EndFunc

 

[jchd]

Don't forget that AutoIt strings are UTF16 Unicode. This implies that reading, say 10 bytes of ASCII file produces a 10-character (20 bytes) string.

Edited June 25, 2015 by jchd

[kylomas]

Free memory by setting variables that you don't need to 0 or blank ("") after you have your results.

[jchd]

Reassigning a string to the empty string doesn't free the storage previously used: that only reset the string length. Rassigning to a different type (e.g. integer 0) will free the old storage.