Melanie,
If I understand you correctly, sharing the cache between the three servers
that are on OSgrid does not present any issue. I could contaminate the
cache if I copy it from my standalone grid back into the shared cache of the
three OSgrid servers. Do I understand that correctly?
Tom
-----Original Message-----
From: Melanie
Sent: Friday, August 22, 2014 7:57 PM
To: [email protected]
Subject: Re: [Opensim-users] Urban legends (Was :Configuring a multi-hosted
grid)
You can share cache between simulators that use the same central
services, for instance any simulators you use that are on OSGrid.
Don't share caches between services, as the asset ids are not valid
between services and you may wind up creating items that work only
on your own sims and from users' caches, but fail visually in
mysterious ways when taken off-sim.
There is some (yellow) spew occasionally, it's trivial to catch and
prevent in code, if you're so inclined. We have been ignoring it
ever since the cache was written, with no ill effects.
Melanie
On 23/08/2014 01:51, Thomas Ringate wrote:
I've been running a shared cache now for a couple of years. I even copy
them in a round robin fashion between my four servers so they are nearly
identical. I turned off the clean up so anything that has been put in
them
for about the last 10 months is still there.
As you can tell I do not have a clue how the cache is used or how it
really
works. Since every item in is it indexed using the UUID and the first
three
digits of the UUID place them in individual folders, I have not noticed
any
folder being all that large.
The reason I do this is because three of my servers are on OSgrid, the
fourth is where I do my scripting using two standalones which are mirror
images of the 64 regions I host on OSgrid. One standalone is a normal set
of regions and the other is a single varregion.
I found I had much better success of having things appear on my
standalones
once I consolidated all of the caches, but it is still far from being
optimal.
Now I am wondering if doing this is causing a performance hit on the three
servers that host regions for OSgrid???
What do the experts think?
I could merge those cache into the one on the standalone server and have
one
master region clean each servers cache to some appropriate level. I like
the idea of a shared cache on each server. It eliminates redundancy and
eliminates requests by different regions for the same object.
I was surprised to hear it is not used for assets. Why is it named
"asset-cache"?
-----Original Message-----
From: Justin Clark-Casey
Sent: Friday, August 22, 2014 6:54 PM
To: [email protected]
Subject: Re: [Opensim-users] Urban legends (Was :Configuring a
multi-hosted
grid)
Yeah, I've tried a shared cache before and it seems to be okay. It's a
bit
messy because multiple simulators may
attempt to clean up the cache at the same time, which results in quite a
few
seeing messy "file not found" warnings,
though these should not be harmful.
It's hard to know how to get around this problem without making the cache
yet another process or doing messy things like
designating only one simulator to actually clean up files. I also think
the
cache needs a facility to limit by size
(like every other cache in the known universe :).
On 22/08/14 15:28, Jeff Kelley wrote:
At 8:09 AM -0500 22/8/14, Marcus Llewellyn wrote:
You can indeed give each instance its own asset cache directory. My
rationale for not doing so is that where simulators
share content, this should reduce requests to the asset service,
resulting
in less network traffic, and also a modest
speed up when regions are first started in some circumstances.
Because an asset may have been cached already by another simulator.
My only concern has been that a single asset cache that has multiple
copies of Flotsam managing it might at some point
encounter some sort of conflict or collision. So far, I've noticed
nothing
of the sort, though. In practice, a single
asset cache has been working fine for me.
So shared cache is a better option, until we discover a drawback.
-- Jeff
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