Memory Consumption to Read XMLs in PowerShell

Background

PowerShell has an useful function to read and parse XML files: [XML]. But reading XML files and (especially) building DOMs are memory consuming function.

Question

How much memory do you need to read XML files with [XML]?

Methods

See http://d.hatena.ne.jp/N_Nao/20111226/1324926173 for mem.sh.

$ cat xml.ps1
$XML = [XML](Get-Content "./test.xml")
$ ls -l test.xml; ./mem.sh pwsh xml.ps1
-rw-rw-r-- 1 satob satob 7756  4月 20 01:04 test.xml
'pwsh xml.ps1' -> Max RSS = 84172 KB.
$ ls -l test.xml; ./mem.sh pwsh xml.ps1
-rw-rw-r-- 1 satob satob 84556  4月 20 01:04 test.xml
'pwsh xml.ps1' -> Max RSS = 85500 KB.
$ ls -l test.xml; ./mem.sh pwsh xml.ps1
-rw-rw-r-- 1 satob satob 929356  4月 20 01:05 test.xml
'pwsh xml.ps1' -> Max RSS = 118520 KB.
$ ls -l test.xml; ./mem.sh pwsh xml.ps1
-rw-rw-r-- 1 satob satob 6395116  4月 20 01:06 test.xml
'pwsh xml.ps1' -> Max RSS = 368376 KB.

Result

#	(A) XML Size[KB]	(B) Memory Consumption [KB]	(C) Delta from #1-(B)	(C)/(A)
1	8	84,172	-	-
2	85	85,500	1,328	15.6
3	930	118,520	34,348	36.9
4	6,400	118,520	284,204	44.4

Consideration

• Memory consumption of [XML] is 20~40x as large as the target XML file.
• Memory/XML size ratio (C)/(A) can be larger when the XML size is larget.