I did this:

C:\test>p1
$h{ $_ } = 'x'x50 for 1 .. 10e6;;

print total_size( \%h );;
1583106697

print 1583106697 * 35;;
55408734395

[download]

Which looking back at the OP means I calculated the size of a 350 million record file instead of a 350MB file. My mistake.

A more appropriate figure for the OPs 350MB file is 3.8GB:

C:\test>dir file2x
10/04/2012  17:27       369,499,228 file2x

C:\test>perl -nle"($k,$v)=split '\*'; $h{$k}=$v }{ print 'Check mem'; 
+<>" file2x
Check mem
3.8GB

[download]

I did try to use the latest Devel::Size to do the measurement, but it pushed the memory usage over 8GB before crashing. Looks like it is time for a new release of my unauthorised version.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re^6: Indexing two large text files by BrowserUk
in thread Indexing two large text files by never_more

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