The first part of the collection process - 
$balances{$cust} += $bal * $fx_rates->{$ccy};

[download]
calculates the total balance for each customer, where each customer can have transactions in multiple currencies. I have thought about applying certain heuristic, unfortunately I can't make assumptions about customer behaviours (not to mention the consequence of producing an approximate report).

I am stuck with storing balances in memory. I don't want to export these balances into temporary files, because that will introduce significant penalties on storing 10+ million individual accounts to disk and reading them back in again. I will get rid of the memory hungary Schwartzian transform and use a sorting technique that will be balanced on memory usage and speed.

At the end of the selection process, I will have a list of top 30 customers. Come to think about it, I will probably join the 30 customer info in a string of comma separated values, and restart the perl script again with the exec { $^X, $0, @ARGV } technique.

I will go to sleep tonight with these ideas in my mind, I will probably get enlightened in my dreams. :-)

And thanks again for your suggestions.

In reply to Re: Re: Force perl to release memory back to the operating system by Roger
in thread Force perl to release memory back to the operating system by Roger

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