Re: [WebDNA] To Commitdatabase or Not to Commitdatabase
This WebDNA talk-list message is from 2012
It keeps the original formatting.
numero = 108440
interpreted = N
texte = We did a test that i published no so long ago:If you commit databases to disk after modification, it will entirely =depend on the size of your databases and the frequency you write it to =disk: a standard 7200rpm drive is usually able to write 70MB/s. So, if =you get one new [append] every second and your database is a 100MB one, =then you might expect serious I/O disk activity and probably some =latency. The speed difference with "Only commit databases to disk when =instructed" will be a huge one. If the database is 2MB only, the =difference will be smaller.We did some tests that i published not long ago:Automatically commit databases to disk after modification=--------------------------------------------------------------------------=-------WebDNA 7.0.628iMac 2.4GHz, 3GB RAMOpen a database (2 fields), append 10000 records.......................: = 5 sOnly commit databases to disk when instructed=--------------------------------------------------------------------------=-------WebDNA 7.0.628iMac 2.4GHz, 3GB RAMOpen a database (2 fields), append 10000 records.......................: = 0 sNote that this does not measure one single database write, but rather =10,000 successive writes- chrisOn Feb 2, 2012, at 16:48, Govinda wrote:>> The reason for my question above was to figure out if my next move =should be enabling
or just taking on the task of doing a =after (more or less) all of my [append] or [replace] tags.>>=20>> If I was to gain speed / performance by choosing one over the other =then that is what I am looking for.>=20> I don't know. Maybe someone (WSC?) has clocked the difference. =20> You might able to make the speed tests yourself, if you wanted.> I am guessing it is the same internal mechanism, and so no speed =difference.. (assuming you put a [commitdatabase...] after *every* =write operation).>=20> Personally, if I wanted to be sure every write operation resulted in =an updated disk copy, I would not bother any more more than just turning =on the auto-commit feature.>=20> -G>=20> ---------------------------------------------------------> This message is sent to you because you are subscribed to> the mailing list .> To unsubscribe, E-mail to: > archives: http://mail.webdna.us/list/talk@webdna.us> Bug Reporting: support@webdna.us
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We did a test that i published no so long ago:If you commit databases to disk after modification, it will entirely =depend on the size of your databases and the frequency you write it to =disk: a standard 7200rpm drive is usually able to write 70MB/s. So, if =you get one new [append] every second and your database is a 100MB one, =then you might expect serious I/O disk activity and probably some =latency. The speed difference with "Only commit databases to disk when =instructed" will be a huge one. If the database is 2MB only, the =difference will be smaller.We did some tests that i published not long ago:Automatically commit databases to disk after modification=--------------------------------------------------------------------------=-------WebDNA 7.0.628iMac 2.4GHz, 3GB RAMOpen a database (2 fields), append 10000 records.......................: = 5 sOnly commit databases to disk when instructed=--------------------------------------------------------------------------=-------WebDNA 7.0.628iMac 2.4GHz, 3GB RAMOpen a database (2 fields), append 10000 records.......................: = 0 sNote that this does not measure one single database write, but rather =10,000 successive writes- chrisOn Feb 2, 2012, at 16:48, Govinda wrote:>> The reason for my question above was to figure out if my next move =should be enabling or just taking on the task of doing a =after (more or less) all of my [append] or [replace] tags.>>=20>> If I was to gain speed / performance by choosing one over the other =then that is what I am looking for.>=20> I don't know. Maybe someone (WSC?) has clocked the difference. =20> You might able to make the speed tests yourself, if you wanted.> I am guessing it is the same internal mechanism, and so no speed =difference.. (assuming you put a [commitdatabase...] after *every* =write operation).>=20> Personally, if I wanted to be sure every write operation resulted in =an updated disk copy, I would not bother any more more than just turning =on the auto-commit feature.>=20> -G>=20> ---------------------------------------------------------> This message is sent to you because you are subscribed to> the mailing list .> To unsubscribe, E-mail to: > archives: http://mail.webdna.us/list/talk@webdna.us> Bug Reporting: support@webdna.us
christophe.billiottet@webdna.us
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