Is there a rule of thumb for estimating the max number of threads per processor. If I have a server with 2 XEON quad core processors each operating at 2.33 GHz, can I measure the max practical threads from this perspective, or must I first analyze the throughput on my server first. For example, could I capture the current process time per thread per job and then calculate the max practical threads...? Is the relationship linear if the time per job per thread is equivalent?
I'm all over the map, so I really just need some practical guidance here. Thanks in advance!
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Thanks for the info. I'm really after the throughput from an IIS 7.0 web app to a series of SQL Server 2008 DBs. We've tried to optimize our disk subsystem to maximize i/o, now we're trying to determine how many of the web apps we can realistically support on a single server setup (colocate). If each of the web apps has a configurable number of threads.
Makes sense and just for clarity, is the SQL Server instance(s) hosting the DBs in question installed on the same server. I think so but just to make sure and, by the way, that definitely factors into the equation as increase in web sites / connections would have double or more effect it would on a regular web server as it is also a connection to SQL on same system. Additionally when queries run they utilize memory and to a lessor extent CPU until you use up physical memory and begin paging to disk then CPU gets more utilized to handle the additional I/O to page files which will be in competition with the other I/O normally happening for SQL Server and possibly the web application(s).
I have seen really light-weight boxes host 100s of web sites on a single IP even and also web farms with some applications ending up almost requiring a standalone server, so will give it some more thought as there is a formula but there is a lot of gut feel (with trial and error) too. Subsequently, another good place to start when thinking about this is what are these application(s) -- i.e., are they all pure (traditional) web sites or are they client/server applications that just happen to have a web front end. The distinction in my mind is simplified to : can I just copy the files and runs on my system OR do I have to run your installer.
Anyway, will post back when I have some more thoughts.
Hopefully you get some other input on this as well now that we have more particulars on what you are looking for.
--Kevin
Business Accounts
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by: mwvisa1Posted on 2009-09-23 at 13:27:13ID: 25407559
Not quite sure what you are after, but given the zones I would suspect you are looking for IIS performance tuning information; however, the version of IIS you are running is not specified.
These should help for IIS 6 - 7:
http://blogs.msdn.com/tmar
http://www.microsoft.com/t
In a nutshell, think 50 threads per CPU is what I have seen around, but you can increase up or down until works well in your environment, but should stay below 100.
--isa