<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Atif,<br>
<br>
I understood it the same way you did, and was saying that serving files
from memcached as opposed to the filesystem has negligible benefits,
and sometimes actually performs worse.<br>
<br>
The reference to error_page (not error_file as I said before - memory
slip) was just as a means to populate memcache when there's no data in
the cache - you could easily use this method to put the file into
memcache from the filesystem. You wouldn't need to use an Nginx module
to put the file into memcache (at least not with the current Perl
module - it's blocking, so would slow everything down too much, though
with a non-blocking version it could be ok) - though I understand that
that's what he's talking about and where he's talking about hooking it
in.<br>
<br>
Another method would be to use the try_files directive.<br>
<br>
Overall, though, I can only see populating memcache with a file to
serve through Nginx as being overall slower than serving the file from
the filesystem. In my tests, memcache vs filesystem is pretty similar,
and adding any kind of overhead to put a file in memcache will mean
just serving the file statically will be more efficient (and won't
waste memory unnecessarily). I could see storing static files in an
internal memory cache being a bit quicker than serving files
statically, but actually not all that much, and would only possibly be
of real benefit for files that are under very high demand (e.g. a
homepage or a logo on a high-traffic site).<br>
<br>
Cheers,<br>
<br>
Marcus.<br>
<br>
<br>
Given that the<br>
<br>
Atif Ghaffar wrote:
<blockquote
cite="mid:f240b640903050751i7b52c787y6926da3cebb45d16@mail.gmail.com"
type="cite"><br>
<br>
<div class="gmail_quote">On Thu, Mar 5, 2009 at 12:34 PM, Marcus
Clyne <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:eugaia@gmail.com">eugaia@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"><br>
For populating the cache, have you looked at the error_file directive.
You can set the error file to script which could be passed to an FCGI
process, so that on a cache-miss the script is called to generate the
page, which could in the process put the file into the memcached
cache. </div>
</blockquote>
<div><br>
Marcus, <br>
<br>
I believe Daniel was talking about the opposite. He want to populate
the cache if nginx hits the file instead of when it does not find it.<br>
<br>
So something like this (this is how nginx would do it<br>
<br>
request comes from /files/1.txt<br>
1. Check if memcache exists and serve from there.<br>
2. Check if file exist and serve from here. <---- This is where he
wants to hook it :-)<br>
3. If file does not exists, handle error.<br>
<br>
What Daniel wants (if I understood correctly)<br>
request comes from /files/1.txt<br>
1. Check if memcache exists and serve from there.<br>
2. if(-f file ) call the perl/fcgi process that populates the memcache
cache and returns the file. (so this would be done only where there is
no cache in memcache)<br>
3. If file does not exists, handle error.<br>
<br>
<br>
Still I dont see whats the point of this but yes it is doable.<br>
<br>
best regards<br>
<br>
<br>
<br>
<br>
<br>
</div>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">This of course only really
makes sense for dynamically-generate
content.<br>
<font color="#888888"><br>
Marcus.</font>
<div>
<div class="h5"><br>
<br>
<br>
Atif Ghaffar wrote:
<blockquote type="cite">Daniel, <br>
<br>
I see now your other posts, <br>
<br>
I do not think that you will get any benifit of using memcached with
static files.<br>
Nginx is already very optimized at serving static files.<br>
<br>
<br>
<div class="gmail_quote">On Wed, Mar 4, 2009 at 11:17 PM, Daniel
Rhoden <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:drhoden@iiwinc.com" target="_blank">drhoden@iiwinc.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">This
is purely speculative, so please don't think I know how to do this.
I'm throwing this out so hopefully, if a good idea, the right people
can create the example.<br>
<br>
Memcached has a good assortment of Perl clients.<br>
<br>
Nginx has a means of embedding Perl into the configuration.<br>
<br>
Couldn't there be a way of combining these to immediately populate the
cache when the cache returns missing?<br>
<br>
By the way, I'm looking at this as a means of improving I/O for static
pages (on SliceHost). Ideally nginx's Memcached Module would have the
ability to do this when the requested filename exists on the hard drive:<br>
(-f $request_filename/index.html)<br>
<font color="#888888"><br>
<br>
Daniel Rhoden<br>
Director of Information Technology<br>
Interactive Internet Websites, Inc.<br>
3854 - 2 Killearn Court<br>
Tallahassee, Florida 32309<br>
Voice: (256) 878-5554<br>
E-Mail: <a moz-do-not-send="true" href="mailto:drhoden@iiwinc.com"
target="_blank">drhoden@iiwinc.com</a><br>
Website: <a moz-do-not-send="true" href="http://iiwinc.com"
target="_blank">iiwinc.com</a><br>
<br>
<br>
</font></blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
best regards<br>
Atif Ghaffar<br>
</blockquote>
<br>
</div>
</div>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
best regards<br>
Atif Ghaffar<br>
</blockquote>
<br>
</body>
</html>