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Re: Idea for reducing disk IO on tagging operations
From: |
Dr. David Alan Gilbert |
Subject: |
Re: Idea for reducing disk IO on tagging operations |
Date: |
Wed, 23 Mar 2005 12:37:00 +0000 |
User-agent: |
Mutt/1.5.6+20040907i |
* Jim Hyslop (address@hidden) wrote:
> Dr. David Alan Gilbert wrote:
> > 2) I could do with a better under standing of the directory locks;
> > pointers? I've read the top of lock.c but it still doesn't tell me
> > enough; for example there seem to be multiple lock files used - but
> > then surely the creation of them isn't atomic? Or is there one lock
> > file used for both reading and writing?
> The locking process is explained in the manual, at
> https://www.cvshome.org/docs/manual/cvs-1.11.19/cvs_2.html#SEC17
Thanks Jim for pointing me at that (I'd had a good search through
the FAQ rather than the manual....).
(and to Paul - apologies if I misquoted in that last email)
OK; this convinces me that I don't need to worry about cvs reading
my file while it is being modified. Together with the restriction
of me only performing my trick if the write is entirely within
a block then I feel reasonably safe.
I'm going to have a crack at making this optimisation and will
forward a copy here for discussion when I've done it.
Dave
-----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux on Alpha,68K| Happy \
\ gro.gilbert @ treblig.org | MIPS,x86,ARM,SPARC,PPC & HPPA | In Hex /
\ _________________________|_____ http://www.treblig.org |_______/
- Re: Idea for reducing disk IO on tagging operations, (continued)
- Re: Idea for reducing disk IO on tagging operations, Mark D. Baushke, 2005/03/20
- Re: Idea for reducing disk IO on tagging operations, Dr. David Alan Gilbert, 2005/03/20
- Re: Idea for reducing disk IO on tagging operations, Paul Sander, 2005/03/20
- Re: Idea for reducing disk IO on tagging operations, Mark D. Baushke, 2005/03/21
- Re: Idea for reducing disk IO on tagging operations, Todd Denniston, 2005/03/21
- Re: Idea for reducing disk IO on tagging operations, Mark D. Baushke, 2005/03/21
- Re: Idea for reducing disk IO on tagging operations, Spiro Trikaliotis, 2005/03/30
Re: Idea for reducing disk IO on tagging operations, Tony Aiuto, 2005/03/21
Re: Idea for reducing disk IO on tagging operations, Dr. David Alan Gilbert, 2005/03/22
Re: Idea for reducing disk IO on tagging operations, Paul Sander, 2005/03/22
RE: Idea for reducing disk IO on tagging operations, Jim.Hyslop, 2005/03/28