Date: Tue, 10 Oct 2006 15:59:46 -0400 From: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org> To: freebsd-hackers@FreeBSD.ORG Subject: Re: "tar -c|gzip" faster than "tar -cz"?!? Message-ID: <17707.64434.913943.549852@bhuda.mired.org> In-Reply-To: <200610101727.k9AHRrYo039774@lurza.secnetix.de> References: <200610101727.k9AHRrYo039774@lurza.secnetix.de>
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In <200610101727.k9AHRrYo039774@lurza.secnetix.de>, Oliver Fromme <olli@lurza.secnetix.de> typed: > Is that a known problem? Is someone working on it? Not necessarily a known problem, but not a surprise. I'm not sure about the size issue - it's not clear what compression level it's running at. The real time difference is expected. tar uses libarchive, which does the compression in the process. So while piping tar's output to gzip will let gzip compress data while tar is waiting on disk I/O, having tar compress things for you means that doesn't happen. Fixing that is a non-trivial task. Since they use different code - with different licenses - some difference is expected. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information.
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