Date: Wed, 7 Jul 2004 20:48:45 -0700 From: David Schultz <das@FreeBSD.ORG> To: Eitarou Kamo <e-kamo@trio.plala.or.jp> Cc: Daniel Ellard <ellard@eecs.harvard.edu> Subject: Re: Article on Sun's DTrace Message-ID: <20040708034845.GA59801@VARK.homeunix.com> In-Reply-To: <40EB9A46.2050409@trio.plala.or.jp> References: <20040706120130.3DF9816A57D@hub.freebsd.org> <20040706101140.T92636@bowser.eecs.harvard.edu> <40EB9A46.2050409@trio.plala.or.jp>
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On Wed, Jul 07, 2004, Eitarou Kamo wrote: > FreeBSD has good features such as jail, chroot e.t.c. which can controll Solaris 10 has these features, too, but I'm not sure what that has to do with DTrace. > process or resources in parallel. So you need not port DTrace entirely. > You can implement DTrace like one from scratch. Using legacy system > sometimes makes new system feature. I would rather expect new one than > porting. DTrace is one of example, I think. You may be able to fork new > debug > process in parallel in the future. If I dare name it, It's "B(SD)Trace"? > But it's up to > your effort. DTrace is a pioneer work. And for the people like me who > bothers > to put the debug lines in kernel this must be powerful tool. The page referenced earlier in this thread pointed out that 6 staff-years went into DTrace. That's accurate, and we're not talking about part-time employees or people who don't know what they're doing. The D compiler aside, this is not a small matter of programming that can just be ported to a new OS or machine architecture in a few months. That said, there is prior work in this area, such as: http://oss.software.ibm.com/developer/opensource/linux/projects/dprobes/ But these other efforts don't come close to DTrace.
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