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Hello, I was wondering if anyone has run across a means consolidating or
clustering their cache? Currently we have 20 nodes that only serve up
static content. Each node is configured with a 6G ramdisk
(mod_disk_cache). This works *ok* except for a couple issues. 1) We
experience intermittent performance issues (it seems to happen when
htcacheclean kicks off), and 2) the cache varies from machine to machine.

I was digging around with mod_memcache - I really like the idea but 1) it
doesn't look like it's actively developed, and 2) I can't seem to get the
caching to do what I want. I was also briefly looking at JCS - but that
maybe a little overkill?

I could have the content stored on a shared NFS mount but I wanted to stay
away from disk-based caching if I could.

If anyone has any suggestions or ideas I'd appreciate it greatly.

Matt

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Hello, I was wondering if anyone has run across a means consolidating or cl=
ustering their cache?=A0 Currently we have 20 nodes that only serve up stat=
ic content.=A0 Each node is configured with a 6G ramdisk (mod_disk_cache).=
=A0 This works *ok* except for a couple issues.=A0 1) We experience intermi=
ttent performance issues (it seems to happen when htcacheclean kicks off), =
and 2) the cache varies from machine to machine.<br>
<br>I was digging around with mod_memcache - I really like the idea but 1) =
it doesn't look like it's actively developed, and 2) I can't se=
em to get the caching to do what I want.=A0 I was also briefly looking at J=
CS - but that maybe a little overkill?<br>
<br>I could have the content stored on a shared NFS mount but I wanted to s=
tay away from disk-based caching if I could.<br><br>If anyone has any sugge=
stions or ideas I'd appreciate it greatly.<br><br>Matt<br>

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Matthew Tice <mjtice [at] gmail.com> writes:

> I was digging around with mod_memcache - I really like the idea but 1) it
> doesn't look like it's actively developed, and 2) I can't seem to get the
> caching to do what I want.

Yes, mod_mem_cache development is pretty much stopped, and it's been
dropped from the next release of Apache. Also consider that mem_cache
would have an independent cache per process, which would be the reverse
of the consolidation you're looking for.


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On Mon, Dec 7, 2009 at 20:08, Matthew Tice <mjtice [at] gmail.com> wrote:
> Hello, I was wondering if anyone has run across a means consolidating or
> clustering their cache?=C2=A0 Currently we have 20 nodes that only serve =
up
> static content.=C2=A0 Each node is configured with a 6G ramdisk
> (mod_disk_cache).=C2=A0 This works *ok* except for a couple issues.=C2=A0=
1) We
> experience intermittent performance issues (it seems to happen when
> htcacheclean kicks off), and 2) the cache varies from machine to machine.
>
> I was digging around with mod_memcache - I really like the idea but 1) it
> doesn't look like it's actively developed, and 2) I can't seem to get the
> caching to do what I want.=C2=A0 I was also briefly looking at JCS - but =
that
> maybe a little overkill?
>
> I could have the content stored on a shared NFS mount but I wanted to sta=
y
> away from disk-based caching if I could.
>
> If anyone has any suggestions or ideas I'd appreciate it greatly.
>

Since it is only really static content, and provided that when a given
element changes, its URI changes, you should definitely look at
mod_expires:

ExpiresActive On

<Location /some/static/URI/base>
ExpiresDefault "access plus 1 month" # or more
Header append Cache-Control "private" # this tells that the proxy
won't cache, but the final client will
</Location>

You don't even need disk-based caching. The OS' pagecache will largely
fill the "need for speed".

--

Francis Galiegue
ONE2TEAM
Ing=C3=A9nieur syst=C3=A8me
Mob : +33 (0) 683 877 875
Tel : +33 (0) 178 945 552
fge [at] one2team.com
40 avenue Raymond Poincar=C3=A9
75116 Paris

------------------------------------------------------------ ---------
The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:http://httpd.apache.org/userslist.html> for more info.
To unsubscribe, e-mail: users-unsubscribe [at] httpd.apache.org
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For additional commands, e-mail: users-help [at] httpd.apache.org

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On Mon, Dec 7, 2009 at 12:23 PM, Dan Poirier <poirier [at] pobox.com> wrote:

> Matthew Tice <mjtice [at] gmail.com> writes:
>
> > I was digging around with mod_memcache - I really like the idea but 1) it
> > doesn't look like it's actively developed, and 2) I can't seem to get the
> > caching to do what I want.
>
> Yes, mod_mem_cache development is pretty much stopped, and it's been
> dropped from the next release of Apache. Also consider that mem_cache
> would have an independent cache per process, which would be the reverse
> of the consolidation you're looking for.
>
>
Well, I was talking about mod_memcache (
http://code.google.com/p/modmemcache/) which seems to sort of be an
Apache-frontend for memcached servers. To get around using mod_mem_cache I
use mod_disk_cache on a ramdisk. It does great except for some reason I
can't get it to scale over 4G very well.

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<br><br><div class=3D"gmail_quote">On Mon, Dec 7, 2009 at 12:23 PM, Dan Poi=
rier <span dir=3D"ltr"><<a href=3D"mailto:poirier [at] pobox.com">poirier [at] pob=
ox.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"=
border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; paddi=
ng-left: 1ex;">
<div class=3D"im">Matthew Tice <<a href=3D"mailto:mjtice [at] gmail.com">mjti=
ce [at] gmail.com</a>> writes:<br>
<br>
> I was digging around with mod_memcache - I really like the idea but 1)=
it<br>
> doesn't look like it's actively developed, and 2) I can't =
seem to get the<br>
> caching to do what I want.<br>
<br>
</div>Yes, mod_mem_cache development is pretty much stopped, and it's b=
een<br>
dropped from the next release of Apache. =A0Also consider that mem_cache<br=
>
would have an independent cache per process, which would be the reverse<br>
of the consolidation you're looking for.<br>
<div><div></div><div class=3D"h5"><br></div></div></blockquote></div><br>We=
ll, I was talking about mod_memcache (<a href=3D"http://code.google.com/p/m=
odmemcache/">http://code.google.com/p/modmemcache/</a>) which seems to sort=
of be an Apache-frontend for memcached servers.=A0 To get around using mod=
_mem_cache I use mod_disk_cache on a ramdisk.=A0 It does great except for s=
ome reason I can't get it to scale over 4G very well.<br>

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On Mon, Dec 7, 2009 at 4:04 PM, Francis GALIEGUE <fge [at] one2team.com> wrote:

> On Mon, Dec 7, 2009 at 20:08, Matthew Tice <mjtice [at] gmail.com> wrote:
> > Hello, I was wondering if anyone has run across a means consolidating or
> > clustering their cache? Currently we have 20 nodes that only serve up
> > static content. Each node is configured with a 6G ramdisk
> > (mod_disk_cache). This works *ok* except for a couple issues. 1) We
> > experience intermittent performance issues (it seems to happen when
> > htcacheclean kicks off), and 2) the cache varies from machine to machine.
> >
> > I was digging around with mod_memcache - I really like the idea but 1) it
> > doesn't look like it's actively developed, and 2) I can't seem to get the
> > caching to do what I want. I was also briefly looking at JCS - but that
> > maybe a little overkill?
> >
> > I could have the content stored on a shared NFS mount but I wanted to
> stay
> > away from disk-based caching if I could.
> >
> > If anyone has any suggestions or ideas I'd appreciate it greatly.
> >
>
> Since it is only really static content, and provided that when a given
> element changes, its URI changes, you should definitely look at
> mod_expires:
>
> ExpiresActive On
>
> <Location /some/static/URI/base>
> ExpiresDefault "access plus 1 month" # or more
> Header append Cache-Control "private" # this tells that the proxy
> won't cache, but the final client will
> </Location>
>
> You don't even need disk-based caching. The OS' pagecache will largely
> fill the "need for speed".
>
> --
>

Thanks Francis, I'm a little confused about a couple things. 1) Is the
ExpiresDefault in mod_expires similar to CacheDefaultExpire in mod_cache?
2) This wouldn't address the need for a backend global cache? Also I
wanted to limit/reduce any kind of paging and it seems that with 9+G of
cache I would be swapping all over the place.

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<br><br><div class=3D"gmail_quote">On Mon, Dec 7, 2009 at 4:04 PM, Francis =
GALIEGUE <span dir=3D"ltr"><<a href=3D"mailto:fge [at] one2team.com">fge [at] one2=
team.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; p=
adding-left: 1ex;">
<div><div></div><div class=3D"h5">On Mon, Dec 7, 2009 at 20:08, Matthew Tic=
e <<a href=3D"mailto:mjtice [at] gmail.com">mjtice [at] gmail.com</a>> wrote:<b=
r>
> Hello, I was wondering if anyone has run across a means consolidating =
or<br>
> clustering their cache?=A0 Currently we have 20 nodes that only serve =
up<br>
> static content.=A0 Each node is configured with a 6G ramdisk<br>
> (mod_disk_cache).=A0 This works *ok* except for a couple issues.=A0 1)=
We<br>
> experience intermittent performance issues (it seems to happen when<br=
>
> htcacheclean kicks off), and 2) the cache varies from machine to machi=
ne.<br>
><br>
> I was digging around with mod_memcache - I really like the idea but 1)=
it<br>
> doesn't look like it's actively developed, and 2) I can't =
seem to get the<br>
> caching to do what I want.=A0 I was also briefly looking at JCS - but =
that<br>
> maybe a little overkill?<br>
><br>
> I could have the content stored on a shared NFS mount but I wanted to =
stay<br>
> away from disk-based caching if I could.<br>
><br>
> If anyone has any suggestions or ideas I'd appreciate it greatly.<=
br>
><br>
<br>
</div></div>Since it is only really static content, and provided that when =
a given<br>
element changes, its URI changes, you should definitely look at<br>
mod_expires:<br>
<br>
ExpiresActive On<br>
<br>
<Location /some/static/URI/base><br>
=A0 =A0ExpiresDefault "access plus 1 month" # or more<br>
=A0 =A0Header append Cache-Control "private" # this tells that t=
he proxy<br>
won't cache, but the final client will<br>
</Location><br>
<br>
You don't even need disk-based caching. The OS' pagecache will larg=
ely<br>
fill the "need for speed".<br>
<div class=3D"im"><br>
--<br></div></blockquote></div><br>Thanks Francis, I'm a little confuse=
d about a couple things.=A0 1) Is the ExpiresDefault in mod_expires similar=
to CacheDefaultExpire in mod_cache?=A0 2) This wouldn't address the ne=
ed for a backend global cache?=A0=A0 Also I wanted to limit/reduce any kind=
of paging and it seems that with 9+G of cache I would be swapping all over=
the place. <br>

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