This is my cache setup
<cache name="cache_sqlite" type="sqlite3">
<dbfile>/var/www/path..../maps/cache/{tileset}/{grid}/{z}/{x}-{y}.sqlite3</dbfile>
<xcount>10000</xcount>
<ycount>10000</ycount>
<pragma name="max_page_count">1573741823</pragma>
</cache>
<grid name="bcgrid">
<metadata>
<title>this is a custom grid I made up for an
example</title>
</metadata>
<srs>EPSG:27700</srs>
<size>128 128</size>
<extent>0 0 700000 1250000</extent>
<resolutions>70 28 14 7 6.16 2.8 1.4 0.7 0.28 0.14 0.07</resolutions>
</grid>
<tileset name="bccache">
<source>bcmaps</source>
<cache>cache_sqlite</cache>
<grid>bcgrid</grid>
<format>JPEG</format>
<metatile>4 4</metatile>
<metabuffer>0</metabuffer>
<expires>31536000</expires>
</tileset>
Sebastiano Laini
Web Developer
Buchanan Computing
227 Shepherds Bush Road London W6 7AS
020 8846 3220
Web: http://www.BuchananComputing.co.uk<http://www.buchanancomputing.co.uk/>
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From: Sebastiano Laini
Sent: 17 October 2018 13:39
To: 'mapserver-users@lists.osgeo.org' <mapserver-users@lists.osgeo.org>
Cc: 'Rahkonen Jukka (MML)' <jukka.rahko...@maanmittauslaitos.fi>
Subject: RE: mapcache fastcgi
Hi,
It appears in both ways, when I'm seeding and when is requested from a
pre-seeded cache, today I can't because I need to move the dev domain in
another server but tomorrow I will pass you the link to the 2 cache so you can
see the difference.
Tonight I will let it seed the whole area.
The cache is on a normal HDD, I think all out servers are 10000 RPM, and the
test was done on a brand new server so the disk is new.
Sebastiano Laini
Web Developer
Buchanan Computing
From: Rahkonen Jukka (MML) [mailto:jukka.rahko...@maanmittauslaitos.fi]
Sent: 17 October 2018 13:35
To: Sebastiano Laini
<sebastiano.la...@buchanancomputing.co.uk<mailto:sebastiano.la...@buchanancomputing.co.uk>>;
'mapserver-users@lists.osgeo.org'
<mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>>
Subject: RE: mapcache fastcgi
Hi,
In which way does the slowness appear? Is it when seeding or when serving from
a pre-seeded cache? Can you give metrics about the difference in speed?
In this comparison the differences were rather small
http://blog.sogeo.services/blog/2016/07/01/mapcache-disk-vs-sqlite.html
Also by the documentation the speed should be only "a bit slower"
The SQLite based caches are a bit slower than the disk based caches, and may
have write-locking issues at seed time if a high number of threads all try to
insert new tiles concurrently.
You wrote that SQLite cache is very slow for you which makes me think that
there is something sub-optimal in your installation. First thing to check is if
the SQLite database is on a fast disk.
If SQLite cache is slow then MBTiles cache should be slow as well but I would
make a test to be sure.
-Jukka Rahkonen-
Lähettäjä: Sebastiano Laini [mailto:sebastiano.la...@buchanancomputing.co.uk]
Lähetetty: 17. lokakuuta 2018 15:00
Vastaanottaja: 'mapserver-users@lists.osgeo.org'
<mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>>
Kopio: Rahkonen Jukka (MML)
<jukka.rahko...@maanmittauslaitos.fi<mailto:jukka.rahko...@maanmittauslaitos.fi>>
Aihe: RE: mapcache fastcgi
Is there a way to improve the speed and match the speed of the sqLite3 cache
with the disk one?
We have 80 websites connected to MapCache and when I tried the sqLite3 I was
testing it just on one website and on a complete different server with nothing
in it.
Sebastiano Laini
Web Developer
Buchanan Computing
From: Sebastiano Laini
Sent: 17 October 2018 12:43
To: 'mapserver-users@lists.osgeo.org'
<mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>>
Cc: 'Rahkonen Jukka (MML)'
<jukka.rahko...@maanmittauslaitos.fi<mailto:jukka.rahko...@maanmittauslaitos.fi>>
Subject: RE: mapcache fastcgi
Still it redirect you to that link, and btw it seems that mapcache can be used
also as a fastCGI.
https://mapserver.org/mapcache/install.html#cgi-fastcgi-specific-instructions
Though is true that I'm reading now in the CMaker Builder section
MapCache can run as a FastCGI executable. Note that the overhead of FastCGI is
non-negligible with respect to the throughput you may obtain with a native
Apache module. The FastCGI build is less tested, and may lag behind the Apache
module version on some minor details. YMMV.
Sebastiano Laini
Web Developer
Buchanan Computing
From: Rahkonen Jukka (MML) [mailto:jukka.rahko...@maanmittauslaitos.fi]
Sent: 17 October 2018 12:39
To: Sebastiano Laini
<sebastiano.la...@buchanancomputing.co.uk<mailto:sebastiano.la...@buchanancomputing.co.uk>>;
'mapserver-users@lists.osgeo.org'
<mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>>
Subject: VS: mapcache fastcgi
Hi,
That documentation is about Mapserver, Mapcache is another software. It does
belong to the same Mapserver but is not the same.
MapCache is documented here:
https://mapserver.org/mapcache/index.html#mapcache
-Jukka Rahkonen-
Lähettäjä: Sebastiano Laini [mailto:sebastiano.la...@buchanancomputing.co.uk]
Lähetetty: 17. lokakuuta 2018 14:33
Vastaanottaja: 'mapserver-users@lists.osgeo.org'
<mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>>
Kopio: Rahkonen Jukka (MML)
<jukka.rahko...@maanmittauslaitos.fi<mailto:jukka.rahko...@maanmittauslaitos.fi>>
Aihe: RE: mapcache fastcgi
Well, for what I can read in the documentation of mapserver:
https://mapserver.org/optimization/fastcgi.html
FastCGI is a protocol for keeping cgi-bin style web applications running as a
daemon to take advantage of preserving memory caches, and amortizing other high
startup costs (like heavy database connections) over many requests.
It seems that using mapcache as fastCGI over apache modules it that should
improve speed also.
Sebastiano Laini
Web Developer
Buchanan Computing
From: Rahkonen Jukka (MML) [mailto:jukka.rahko...@maanmittauslaitos.fi]
Sent: 17 October 2018 12:30
To: Sebastiano Laini
<sebastiano.la...@buchanancomputing.co.uk<mailto:sebastiano.la...@buchanancomputing.co.uk>>;
'mapserver-users@lists.osgeo.org'
<mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>>
Subject: Re: mapcache fastcgi
Hi,
Could you explain your plan with some more details? What I have understood is
that you have experienced that SQLite cache is slower than disk cache in your
environment.
What I do not understand is what you are going to reach by running Mapcache as
fastcgi instead of running it as Apache module which should be the faster
option, and if this has some connection with the SQLite cache vs. disk cache
comparison. Do you guess that fastcgi woud make SQLite cache faster?
-Jukka Rahkonen-
Lähettäjä: mapserver-users [mailto:mapserver-users-boun...@lists.osgeo.org]
Puolesta Sebastiano Laini
Lähetetty: 17. lokakuuta 2018 12:16
Vastaanottaja: 'mapserver-users@lists.osgeo.org'
<mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>>
Aihe: [mapserver-users] mapcache fastcgi
Hi all,
In the end I tried MapCache with sqlite3 cache but it's very slow compared with
the disk cache, so I want to setup MapCache with fastCGI on CentOS 7.
I don't understand what I need to install as the fastCGI link in the
documentation is broken and I don't know if is up to date.
I already have apache fgcid installed from default in the httpd folder and I
use PHP in fastCGI in all the domains, so I'm sure that fastCGI it works,
though, I still need the fastCGI library? How can I install it in CentOS 7?
In my apache conf I've already added the lines to load the mapcache module and
the mapcache.xml file
LoadModule mapcache_module modules/mod_mapcache.so
<IfModule mapcache_module>
<Directory /path/to/directory>
Require all granted
</Directory>
MapCacheAlias /mapcache "/path/to/directory/mapcache.xml"
</IfModule>
I need to leave the previous configuration and add these new lines in the conf
files?
FcgidInitialEnv "MAPCACHE_CONFIG_FILE" "/path/to/mapcache/mapcache.xml
<IfModule mod_fcgid.c>
IPCCommTimeout 120
MaxProcessCount 10
FcgidInitialEnv "MAPCACHE_CONFIG_FILE" "/path/to/mapcache/mapcache.xml"
<Location /map.fcgi>
Order Allow,Deny
Allow from all
SetHandler fcgid-script
</Location>
ScriptAlias /map.fcgi "/path/to/mapcache/src/mapcache"
</IfModule>
And then instead of http://myserver/mapcache I need to use
http://myserver/fcgi-bin to access mapcache fcgi?
Regards,
Sebastiano Laini
Web Developer
Buchanan Computing
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