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Article #20Re: How to find *real* file sizes in AOS/VS...?
From: The Sixth Replicant
Date: Fri, 22 Sep 1989 14:58
Date: Fri, 22 Sep 1989 14:58
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In article <8416@boring.cwi.nl> dik@cwi.nl (Dik T. Winter) writes: >About getting the disk space used by a specific file. > >I would think that a dumped file might use more space than a file that is >not dumped! The previous poster alluded to compression techniques where >large blocks of 0's were not written to disk. They might very well expand >when dumping in AOS (I do not know). In point of fact, DUMP, DUMP_II and, I believe MOVE, do zero elimination. Whenever there are blocks of zeros, these are not written to the output. There is a system call which has an option to give the next _allocated_ block. I believe it's ?BLKIO, but its been several years. This is used by DUMP_II to avoid spending large quantities of CPU time while scanning zeros from large, unallocated files. ------------------------------------------------------------------------- Marc Neuberger mjn@sbcs.sunysb.edu ----------------------------------------------------------------------------- Marc Neuberger mjn@sbcs.sunysb.edu
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!mailrus!ncar!boulder!sunybcs!sbcs!mjn From: mjn@sbcs.sunysb.edu (The Sixth Replicant) Newsgroups: comp.os.aos Subject: Re: How to find *real* file sizes in AOS/VS...? Message-ID: <3536@sbcs.sunysb.edu> Date: 22 Sep 89 14:58:01 GMT References: <1702@murdu.oz> <116@harald.UUCP> <8416@boring.cwi.nl> Sender: news@sbcs.sunysb.edu Reply-To: mjn@sbstaff2.UUCP (The Sixth Replicant) Organization: Tyrell Corp. Lines: 22