And I disagree with this view. If you've got a server with 512 MB RAM and running the webserver and the db-server on the same machine, 100 idling mysql-processes are a HUGE overhead. At most if not every http-request requires a mysql-connection.
I did many benchmarks and I got a huge decrease of the server-load as I disallowed persistent connections through the php.ini. I am serving around 180K pageviews/day with this config and on the described server. AFAIK it is MUCH more than 100K per mysql-process and a large process table is also of no gain. I may have to agree to your view but only if you have different servers for webserver and database, but I never tested such a config. Thomas On Wed, 14 Aug 2002 11:14:33 -0400 Tod Harter <[EMAIL PROTECTED]> wrote: > On Wednesday 14 August 2002 09:54 am, Thomas Seifert wrote: > > I disagree entirely.... > > Persistent connections have little or nothing to do with increasing load! > > Given that you mention you are using PHP I'll assume you have mod_php running > in Apache. Each Apache child process in this configuration will maintain ONE > open database handle, so 100k pageviews per day I would expect you might max > at like 30k in one hour, or around 10/second, so you might top out at roughly > 100 Apache child processes at any one time, thus 100 database connections. > > Each DB connection is not a huge overhead, but creating and destroying 10 > database handles PER SECOND is a large overhead!!! Remember, every time mysql > creates a connection it has to do internal queries on the grant tables. I > don't know exactly what the overhead of that is going to be, but ANYTHING > that creates 10 queries per second is putting some strain on your database > server! > > One of the main goals of using Apache modules for scripting was to allow > persistent database connections. There is really NO reason to give up that > advantage. Remember, MySQL is multi-threaded, with one thread per connection, > so the resources for a database connection are on the order of under 100k of > memory per connection. > > > it will reduce the load for sure! > > MySQL is very fast in opening and closing connections at least if the > > database-server and webserver are on the same machine. > > I don't know how it will perform on different machines. > > > > > > Thomas > > > > On Wed, 14 Aug 2002 14:40:31 +0100 > > > > "John Wards" <[EMAIL PROTECTED]> wrote: > > > I am running a website which generates around 100,000 pageviews a day and > > > I am wondering if I stop using persistent conections to the MySQL > > > database and use > > > normal open and close conections this would reduce the load onto my > > > server? > > > > > > Most conections are either made through my "main" file or the phorum > > > message board system. > > > > > > Thanks in advance > > > John Wards > > > > --------------------------------------------------------------------- > > Before posting, please check: > > http://www.mysql.com/manual.php (the manual) > > http://lists.mysql.com/ (the list archive) > > > > To request this thread, e-mail <[EMAIL PROTECTED]> > > To unsubscribe, e-mail > > <[EMAIL PROTECTED]> Trouble > > unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php > --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
