[Freeswitch-dev] luasql or freeswitch.dbh

Bernhard Suttner bernhard.suttner at winet.ch
Tue Sep 28 08:14:47 PDT 2010

thanks a lot for these details, but I am not sure how thefreeswitch.dbh interface behaves, if there are many threads which will try touse the connection. Does it then build up more connections or does it blocktill the connection will then be released from the other thread? 
Currently its not possible to me to create the luasql.postges testto access  the database with the native driver but I am sure, that thepostgres driver should be much faster than the ODBC. Could someone test that?
Best regards,

Von: freeswitch-dev-bounces at lists.freeswitch.org[mailto:freeswitch-dev-bounces at lists.freeswitch.org] ImAuftrag von Leon de Rooij
Gesendet: Dienstag, 28. September 2010 16:11
An: freeswitch-dev at lists.freeswitch.org
Betreff: Re: [Freeswitch-dev] luasql or freeswitch.dbh
Hi Bernhard,


I tried out several ways for connecting to a database frominside FreeSWITCH myself before writing the freeswitch.Dbh (which is rathersimple actually - it only exposes already existing FreeSWITCH functionality inmod_lua).


My findings were that caching the connection as is providedby FreeSWITCH gives a huge speed increase compared to re-connecting all thetime as must be done with LuaSQL. Perhaps there are ways to have a connectionpool in ODBC but I didn't investigate that.



Here's a test with LuaSQL with ODBC driver:

require "luasql.odbc"; local env = assert(luasql.odbc())local con = assert(env:connect("dsn","user","pass"))local cur = assert(con:execute ("select 1 as foo, 2 as bar")) local row = {}while (cur:fetch(row, "a")) do  for key, val in pairs(row) do    stream:write(string.format("%25s : %s\n", key, val))  end  stream:write("\n")end cur:close()con:close()env:close() freeswitch at fs-dev> hammer 1000 lua test_luasql_odbc.lua+OK Finished in 38952 ms (min 29 ms, max 107 ms)



The same test with freeswitch.Dbh:

local dbh = assert(freeswitch.Dbh("dsn","user","pass")) assert(dbh:query("select 1 as foo, 2 as bar", function(row)   for key, val in pairs(row) do    stream:write(string.format("%25s : %s\n", key, val))  end  stream:write("\n")end)) assert(dbh:release())

freeswitch at fs-dev> hammer 1000 lua test_lua_dbh.lua+OK Finished in 2723 ms (min 1 ms, max 25 ms)


As you can see, with these tests the freeswitch.Dbh is about14 times as fast as luasql.odbc. Of course this test is single threaded (thescripts are executed serially), so you'd get different results in real-world,and if you have 'long' running scripts with many queries on the same handle,the results would even out a bit.


(btw mod_hammer is a simple app in contrib/ledr/c thatexecutes another app n times and shows how long it took)


I just tried compiling LuaSQL with Postgres driver to do thesame tests, but that borked. Maybe you can give results of that ? I am curioushow it behaves.


About having a native driver or odbc: odbc is just anabstraction layer which uses the native drivers itself, so I'd reckon it shouldbe almost as fast - correct me if I'm wrong ?


I wrote some more about these tests on my blog at http://www.toyos.nl


Kind regards,





On Sep 16, 2010, at 8:52 PM, Bernhard Suttner wrote:


from performance point of view, what should be used to connect to manydifferent databases, luasql or freeswitch.dbh which does use ODBC?

The problem is, that is not only one database but 3-5 databases which are on2-3 different hosts. Lua will be used to fetch the directory and dialplandirectly from the db. Also live-data will be stored on the different databases.The advantage of freeswitch.dbh would be, that the db connections will bere-used. LUAsql would use the native e.g. postgres or mysql driver.

Thanks for any hint. 

Best Regards,

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