GWC specifc:
- What is the unit of "default gutter size" (property
GWCSettingsPage.gutter)
pixels
can we make this more explicit? Is this a
overlapping area of X tiles or the space between? Where can I find an
english description, properly with an example image?
The gutter is a buffer in pixels around the metatile image that is
sliced away when saving the tiles to disk. It only applies to
metatiles and is not applied if the resulting request would exceed the
layer bounds.
- For quota size units are used the followings: MiB, GiB and TiB. I'm
wondering why we do not use the international (standardized?) symbols
like MB, GB and TB (see http://en.wikipedia.org/wiki/Megabyte) see
DiskQuotaConfigPanel
"The computer industry uses terms such as kilobyte, megabyte, and
gigabyte, and corresponding symbols KB, MB, and GB, in two different
ways. For example, in citations of main memory or RAM capacity,
gigabyte customarily means 1073741824 bytes. This is a power of 2,
specifically 230, therefore this usage is referred to as a binary unit
or binary prefix.
In most other contexts, the industry uses kilo, mega, giga, etc., in a
manner consistent with their meaning in the International System of
Units (SI): as powers of 1000. For example, a 500 gigabyte hard drive
holds 500000000000 bytes, and a 100 megabit per second Ethernet
connection transfers data at 100000000 bit/s."
<http://en.wikipedia.org/wiki/Binary_prefix>
- I'm a bit confused abut the cleaning options for quotas : "least
frequently vs. least recently" Does the later one means, that the
tiles, that were created recently will be deleted primarily?
Neiher option is based on tile creation time, but on stats about its usage.
So the same tile may have been created a bunch of times (due to
multiple seed runs over a period of time), but the disk quota module
doesn't care about it, but about how often they're requested by client
code (for LFU) or how long is it since they're not requested (for LRU)
As Dave mentioned on his reply <http://en.wikipedia.org/wiki/Cache_algorithm>
LFU: remove the tiles that are less frequently used
LRU: remove the tiles that are less recently used
Hope that helps and thanks for caring about this.
Gabriel
Cheers,
- Frank
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Gabriel Roldan
OpenGeo - http://opengeo.org
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