Date: Thu, 8 Jul 2004 01:23:04 -0700 From: Avleen Vig <lists-freebsd@silverwraith.com> To: Daniel Ellard <ellard@eecs.harvard.edu> Cc: David Schultz <das@FreeBSD.ORG> Subject: Re: Article on Sun's DTrace Message-ID: <20040708082304.GE5238@silverwraith.com> In-Reply-To: <20040708033741.E28518@bowser.eecs.harvard.edu> References: <20040706120130.3DF9816A57D@hub.freebsd.org> <40EB9A46.2050409@trio.plala.or.jp> <20040708034845.GA59801@VARK.homeunix.com> <20040708033741.E28518@bowser.eecs.harvard.edu>
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On Thu, Jul 08, 2004 at 03:46:24AM -0400, Daniel Ellard wrote: > I don't doubt that DTrace took a long time to do. However, in most > projects the design phase consumes a lot of time, and it is often the > case that unforeseen problems or changes in the feature set cost the > developers a lot of time. So while it might have taken six years to > write DTrace the first time, I suspect it would take a fraction of > that time to re-implement. (It certainly might be longer than "a few > months" and I'm not going to quibble. We won't know the precise > number until someone does the port.) They said "6 staff-years". This means if they have 6 people working on it full time, it took 1 year to complete. If they had 60 people full time, it took just over 5 weeks (technically, i doubt that would work practically). >From speaking to a friend at sun, I do know it took a long time and a lot of effort, and was *not* a simple thing to implement.
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