[mapguide-users] Two performance questions
Jason.Birch at nanaimo.ca
Fri Feb 20 12:17:38 EST 2009
Are you on Linux or Apache? Windows Server 2008 has the option of
allocating multiple worker processes to a single application pool, but
I'm not sure if this has a performance benefit. It appears to be
recommended against in the Sharepoint best practices anyway...
Zac definitely has more experience with large volume, high-performance
mapping that I do, but I think in this case that the primary performance
problem is not due to the resources being managed or unmanaged, but is
instead due to storing multiple files in the same directory, especially
for formats (like SHP) that enumerate the directory looking for feature
classes. My memory is a bit fuzzy on this though and I think Zac may
have had something else to say about this last time it came up here;
maybe managed resources are cached better?
I personally have not seen any performance difference between Managed
and Unmanaged when dealing with self-contained data files like SDF. The
performance difference between SDF and SQLite is much more noticeable in
my experience; definitely worth looking into. As is the performance
difference between complex geometry (curvepolygons, multicurvepolygons,
etc), compared to simple, generalized geometry, and removing unnecessary
columns can make a difference because MapGuide needs to request all data
for rendering in case it's referenced in symbol definitions. You can
get a LOT of mileage from data prep.
For fast tile seeding, it may make sense to distribute the seeding to a
few dedicated back-end servers, and then copy the cached files up to the
Have you tried the MgCooker tile cache seeder that is built into the
latest Maestro preview? I just blogged about this:
I have no idea how the performance compares to the JS-based seeder
Sent: February-20-09 3:16 AM
Subject: [mapguide-users] Two performance questions
1. Is there anything I can do to tweak ISAPI in the same way as is
for FastCGI? I suppose not because when I run Zac's seeder, Task Manager
showing all eight cores being utilised equally.
2. Is there any advantage in loading our SDFs into a repository? At the
moment they're just external. This page...
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