Wednesday Aug 22, 2012

Active File Sparsing

core files are often sparse files.  This article demonstrates a core file written by HP-UX consumes filesystem space equivalent to the physical size of the core file.   'pax' and 'gzip' demonstrate the core file is highly compressible.

pax actively sparses a file extracted from an archive.  This (mostly zeros) core file appears to be 7200 times smaller with respect to the amount of filesystem space used.

A small demonstration program shows how to write sparse files from an application.

Two additional uses for the pax utility.

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About

Dick Dunbar
is an escalation engineer working in the Customer Engineering & Advocacy Lab (CEAL team)
for Oracle Analytics and Performance Management.
I live and work in Santa Cruz, California.
I'll share the techniques I use to detect, avoid and repair problems.

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