The number was a "at least" number, so it was definetely low. I'll take a stab and trying to explain all the depends, but I might be off on some of these.
Performance hit - Flex compiling the MXML into SWF files, there is caching mechanisms built in, dont know the extent how well the caching works. This process is usaully CPU then Memory intensive. This is done when in the JVM so your bottleneck here is the JVM used (IBM, Sun, BEA Jrockit, etc... ). Backend Data Tier ( WebServices/Remoting etc... ) - This depends on what you end up using, could be Java, .Net, or ColdFusion (even PHP or Perl). Assuming you run any of these on the same machine you'll have performance in CPU or Memory, where these bottlenecks follow a typical application bottleneck. These service's performance is not directly related to Flex, unless you are using Flex's sandbox policy then there would be some overhead placed on the JVM again to handle each request. As for benchmarking there are software programs out there that can replay http requests and simulate lots of people hitting your servers. But its still hard to get good numbers unless you simulate your real deployment environment as close as possible. One thing going for Flex is the idea that instead of having alot of small requests hitting your server over a period of time, which eats up resources, you have one medium/big hit at first with little interaction with the server after (of course depending on if the application is getting real-time data or not). You have a situation where they hit it less times over a period of time thus off setting the time server resource you give up for running Flex. The disclaimer is that it just depends. Depends on size of the SWF's, complexity of MXML Flex compiling, data being transfered, interaction of user (does the app have real time data ), etc... In my case I am doing online video training and my bandwidth is going to be a bigger issue then Flex performance for the number of projected users. Its really hard to say what a specific server can do without knowing the extent of how its going to be used and the application being built. Renaun --- In [email protected], "jwc_wensan" <[EMAIL PROTECTED]> wrote: > Renaun: > > I appreciate your input. > > That number seems low. What do you see is the bottleneck? Flex, > CPU, RAM, etc.? > > Without going live, any suggestions on how to benchmark? > > Thanks, > > Jack > > > --- In [email protected], "kaibabsowats" <[EMAIL PROTECTED]> > wrote: > > I won't give you definite answer as it does really depend, but give > > you a at least number. > > > > With Java the JVM has a 1.5Gb ram limitation (unless using Sun > boxes > > or 64 bit correct me if I am wrong). So I usually try and get 2Gb > of > > ram minimum. This allows the JVM use its limit if needed and have > > stuff left over for normal OS and Database usage. > > > > The number I can give is that you can definitely handle a couple > > hundred simultaneous users on a server like that. To spec out > > anything more you need to benchmark the server with the actual > > application. I had a Dual 3.2Ghz Xeon 2Gb ram handle 1000-2000 > > simultaneous users for a Java application that was Memory > intensive. > > > > It is pretty safe to say if you actually have a couple hundred > > simultaneous users you mostly likely have ten of thousand actual > > users. Of course there is no magic number but these are given as > is > > and really should be benchmarked with the actual application. > > > > Renaun > > > > --- In [email protected], "jwc_wensan" <[EMAIL PROTECTED]> > wrote: > > > To All: > > > > > > Yesterday I made a post regarding trying to determine how many > users > > > a single server with one CPU could handle. I realize "it > depends" > > > and I did not define any type of application. > > > > > > I am trying to get some type of handle on what my costs will be > > > regarding CPU licenses, servers, etc. > > > > > > So let me try again. Let's take the Flexstore as an example > > > application. Based on this, can anyone shed some light as to > how > > > many users in an hour the server could adequately handle. > > > > > > Where will the bottleneck occur: Flex, server itself, database, > etc. > > > > > > If an hour is not the right way to measure, then please offer any > > > measurement you feel is correct. > > > > > > Server Configuration: > > > > > > Dell Server @ 3.8 GHz with 1 GB RAM > > > JRUN4 > > > Win 2000 Server > > > 1 Flex license > > > > > > As Dave and others recommended, I will put the database on a > separate > > > server. > > > > > > I am not trying to tie anyone's hands here, just trying to get > some > > > perspective. > > > > > > Thanks in advance, > > > > > > Jack -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
