Date: Mon, 29 Apr 1996 14:27:38 -0600 From: DARREND@novell.com (Darren Davis) To: freebsd-fs@FreeBSD.ORG, pvh@leftside.its.uct.ac.za, merblich@ossi.com Subject: Re: Compressing filesystem: Technical issues - Reply Message-ID: <s184d060.037@fromGW>
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>>> Mitchell Erblich <merblich@ossi.com> 4/29 12:51pm >>> >Peter and et al, > > I would taker in consideration what is the typical type of > file would be compressed and what is the benefit vs the tradeoffs. Disks > are already too slow, isn't the overhead of just uncompressing the blocks, > on demand in a random access pattern add a delay to the fs object. However, > I will proceed with the assumption that this approach may have some merit. Actually, systems tend to be I/O bound more than compute bound. By compressing a file, you potentially are trading off I/Os for CPU cycles (A good tradeoff I believe). Your I/Os will be smaller, but the CPU must expend cycles to uncompress it. I have seen on some systems with fast CPUs and increase in system performance due to the smaller I/Os involved with compressed files. Darren R. Davis Senior Software Engineer Novell, Inc.
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