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Re^6: tying a hash from a big dictionary

by Anonymous Monk
on Oct 31, 2011 at 14:54 UTC ( [id://934895]=note: print w/replies, xml ) Need Help??


in reply to Re^5: tying a hash from a big dictionary
in thread tying a hash from a big dictionary

running on a 4 gb machine, it will run out of memory after about 5m entries!
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Re^7: tying a hash from a big dictionary
by BrowserUk (Patriarch) on Oct 31, 2011 at 15:18 UTC

    Ouch. They must be some long phrases. Even if you're on a 32-bit OS whereby only 2GB or 3GB of that memory is available to the process.

    You're definitely going to need to use external storage.

    I used BerkeleyDB with some success for a bit under 32-bit Perl. Though it can take quite a while for the initial building of a large DB, once built the access/retrieval times are about as good as I've ever seen for a disk-based system. You do need to pay some attention to the various configuration parameters to get the best out of it. Look for the BerkeleyDB tuning guide on-line as the module pod is pretty light on tuning.

    If you find yourself up against it performance-wise then the object interface is marginally quicker than the tied interface, but much less nice to use. If it is a reference-only DB, sticking (the pre-built) DB file on a cheap SSD, or even a fast thumbdrive, can do wonders for access times.

    Just wish I could get it to build for my 64-bit system :(


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