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List:       fossil-users
Subject:    Re: [fossil-users] FossilFS. Was: libfossil + fuse
From:       Stephan Beal <sgbeal () googlemail ! com>
Date:       2014-04-25 12:35:40
Message-ID: CAKd4nAj4LXZoL=fP8E2jW8f66+LH0r9=+9f5WNb0U=FiP2XXDw () mail ! gmail ! com
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On Fri, Apr 25, 2014 at 12:04 AM, Matt Welland <estiforta@gmail.com> wrote:

> This would be a really sweet addition to fossil. Consider caching under
> /var/tmp or something so that performance is decent.
>

That could be used as an alternative to a db-side blob cache, but caching
of some form will be necessary because of the streaming and random access
read() APIs (we don't need/can't realy use write support). We can't
random-access most blobs because they're compressed and/or deltified, so
they have to be expanded/cached before use (but can be done lazily, and
most reads will be a series over the same object, so caching the last-read
blob in memory should make access pretty fast).

-- 
----- stephan beal
http://wanderinghorse.net/home/stephan/
http://gplus.to/sgbeal
"Freedom is sloppy. But since tyranny's the only guaranteed byproduct of
those who insist on a perfect world, freedom will have to do." -- Bigby Wolf

[Attachment #3 (text/html)]

<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Fri, Apr 25, 2014 \
at 12:04 AM, Matt Welland <span dir="ltr">&lt;<a href="mailto:estiforta@gmail.com" \
target="_blank">estiforta@gmail.com</a>&gt;</span> wrote:<br> <blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr"><div>This would be a really sweet addition to \
fossil. Consider caching under /var/tmp or something so that performance is \
decent.<br> </div></div></blockquote><div><br></div><div>That could be used as an \
alternative to a db-side blob cache, but caching of some form will be necessary \
because of the streaming and random access read() APIs (we don&#39;t need/can&#39;t \
realy use write support). We can&#39;t random-access most blobs because they&#39;re \
compressed and/or deltified, so they have to be expanded/cached before use (but can \
be done lazily, and most reads will be a series over the same object, so caching the \
last-read blob in memory should make access pretty fast).</div> \
<div><br></div></div>-- <br><div dir="ltr">----- stephan beal<br><a \
href="http://wanderinghorse.net/home/stephan/" \
target="_blank">http://wanderinghorse.net/home/stephan/</a><div><a \
href="http://gplus.to/sgbeal" target="_blank">http://gplus.to/sgbeal</a></div> \
<div>&quot;Freedom is sloppy. But since tyranny&#39;s the only guaranteed byproduct \
of those who insist on a perfect world, freedom will have to do.&quot; -- Bigby \
Wolf</div></div> </div></div>



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