I've recently posted a Judy array (http://judy.sourceforge.net) wrapper to CPAN at Judy which has a sparse bit vector implementation, Judy1(3) which is available in Perl at Judy::1.

Updated: I've posted Compact and sparse bit vector which is an example of a perl vs Judy bit vector.

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In reply to Re^2: Netflix (or on handling large amounts of data efficiently in perl) by diotalevi
in thread Netflix (or on handling large amounts of data efficiently in perl) by Garp

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