Re: [Zope] ZServer threads and pool-size question
On 4 Jan 2006, at 13:23, Pascal Peregrina wrote: Hi, Can anyone tell me why, by default in a zope instance config file, the connection pool size is 7 while the number of zserver threads is 4? Why not 4 and 4? Because under some conditions you can actually have more than 4 connections in use. Not having extra connections available has the potential to block the server. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] ZServer threads and pool-size question
I understand. So what is the typical value to use for pool-size given a certain threads number: n+3 ? Pascal -Message d'origine- De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de Jens Vagelpohl Envoyé : mercredi 4 janvier 2006 14:31 À : zope list user Objet : Re: [Zope] ZServer threads and pool-size question On 4 Jan 2006, at 13:23, Pascal Peregrina wrote: > Hi, > > Can anyone tell me why, by default in a zope instance config file, > the connection pool size is 7 while the number of zserver threads > is 4? > > Why not 4 and 4? Because under some conditions you can actually have more than 4 connections in use. Not having extra connections available has the potential to block the server. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev ) ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ** ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] ZServer threads and pool-size question
On 4 Jan 2006, at 13:34, Pascal Peregrina wrote: I understand. So what is the typical value to use for pool-size given a certain threads number: n+3 ? There is no "typical value". Changing the thread number and pool size puts you *way* off-road, fiddling with it should be avoided. You will have to experiment if you really think you need to change that setting. More connections -> more RAM usage. Makes me wonder why you think that is necessary. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] ZServer threads and pool-size question
Because I use ZEO, I got lots of often modified objects, and on Zope servers I got lots of memory so I can give it a try ;) Pascal -Message d'origine- De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de Jens Vagelpohl Envoyé : mercredi 4 janvier 2006 14:45 À : zope list user Objet : Re: [Zope] ZServer threads and pool-size question On 4 Jan 2006, at 13:34, Pascal Peregrina wrote: > I understand. > > So what is the typical value to use for pool-size given a certain > threads number: n+3 ? There is no "typical value". Changing the thread number and pool size puts you *way* off-road, fiddling with it should be avoided. You will have to experiment if you really think you need to change that setting. More connections -> more RAM usage. Makes me wonder why you think that is necessary. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev ) ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ** ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] ZServer threads and pool-size question
On 4 Jan 2006, at 13:53, Pascal Peregrina wrote: Because I use ZEO, I got lots of often modified objects, and on Zope servers I got lots of memory so I can give it a try ;) Where do you see the gain? More threads and connection also means more caches that need to be updated/invalidated when you modify an object. You might slow your system down instead. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] ZServer threads and pool-size question
So, are you telling me that the ideal configuration is using all default values (connection objects cache size, ZEO cache size, threads and connection pool)? Pascal -Message d'origine- De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de Jens Vagelpohl Envoyé : mercredi 4 janvier 2006 15:02 À : zope list user Objet : Re: [Zope] ZServer threads and pool-size question On 4 Jan 2006, at 13:53, Pascal Peregrina wrote: > Because I use ZEO, I got lots of often modified objects, and on > Zope servers I got lots of memory so I can give it a try ;) Where do you see the gain? More threads and connection also means more caches that need to be updated/invalidated when you modify an object. You might slow your system down instead. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev ) ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ** ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] ZServer threads and pool-size question
On 4 Jan 2006, at 14:11, Pascal Peregrina wrote: So, are you telling me that the ideal configuration is using all default values (connection objects cache size, ZEO cache size, threads and connection pool)? The default values for thread number and connection pool covers all but the most exotic use cases. The cache sizes can benefit greatly from experimenting, but there is no standard recipe, it all depends on your specific software and hardware environment. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] ZServer threads and pool-size question
Ok, much clearer now... I might focus on cache sizes then. Thanks. Pascal -Message d'origine- De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] De la part de Jens Vagelpohl Envoyé : mercredi 4 janvier 2006 15:17 À : zope list user Objet : Re: [Zope] ZServer threads and pool-size question On 4 Jan 2006, at 14:11, Pascal Peregrina wrote: > So, are you telling me that the ideal configuration is using all > default values (connection objects cache size, ZEO cache size, > threads and connection pool)? The default values for thread number and connection pool covers all but the most exotic use cases. The cache sizes can benefit greatly from experimenting, but there is no standard recipe, it all depends on your specific software and hardware environment. jens ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev ) ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ** ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] ZServer threads and pool-size question
Pascal Peregrina wrote at 2006-1-4 13:34 -: >I understand. > >So what is the typical value to use for pool-size given a certain threads >number: n+3 ? It depends on how intensively you are using additional (application level) threads: Each thread using persistent objects requires in general (at least) one ZODB connection. As such threads are relatively rare, additional 3 connections is not too bad for the general case. -- Dieter ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
RE: [Zope] ZServer threads and pool-size question
Thanks, I will try that ;) -Message d'origine- De : Dieter Maurer [mailto:[EMAIL PROTECTED] Envoyé : mercredi 4 janvier 2006 19:52 À : Pascal Peregrina Cc : Jens Vagelpohl; zope list user Objet : RE: [Zope] ZServer threads and pool-size question Pascal Peregrina wrote at 2006-1-4 13:34 -: >I understand. > >So what is the typical value to use for pool-size given a certain threads >number: n+3 ? It depends on how intensively you are using additional (application level) threads: Each thread using persistent objects requires in general (at least) one ZODB connection. As such threads are relatively rare, additional 3 connections is not too bad for the general case. -- Dieter ** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ** ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
