thanks for the clarifications. ronatartifact wrote: > > If you read the references that I posted, you will see when 32 bit is > faster than 64 bit. > You are not the first guy to ask the question so Microsoft did a pretty > nice test. > > Why is no major hardware vendor selling 32 bit servers for business > applications? If 32 bit was faster, cheaper and they already have lots > of chips and manufacturing infrastructure, the guy selling 32 bit > servers would be killing the rest of the vendors in sales and profits. > HP is not going to spend billions to put out a product line that can not > compete with IBM's old servers and is slower than HP's existing products. > > > Mohan2005 wrote: >> Hello: >> >> we also wish to convert out 32bit dual cores to 64bit dual cores to run >> java >> applications (multiple instances with large JVM memory) >> but people advice that 64bit are 20 - 30% slower than the 32bit with >> smaller >> JVM. >> why? and if true how to overcome?? >> >> thanks >> >> > > Just ignore the these people. They are talking through their hats or > about some weird example that does not reflect servlet engine > performance except at low volumes. There is some overhead in handling > big address spaces. > Everyone knows that it takes a lot longer to format a 320Gb drive than > an 80 GB drive but if you could get either for the same price, you would > take the big drive MOST of the time. > Anyone who buys a dedicated server with 4 GB of memory to run Tomcat > under 32 bit Windows OS where the space available is only 2GB, is being > silly. If you want to go past 2GB, you need to be fully 64bit compatible > right up through the whole stack. > You do need to run a 64 bit OS and a 64 bit JVM to get the advantages of > 64 bit memory addressing capability. > > The Microsoft study used Websphere which I understand to be very close > to Tomcat. > > If this were not a Tomcat forum but was oriented to engineering > simulations, we would be carrying on about floating-point arithmetic > advantages of a machine that has 64 bit internal data paths. > For Tomcat is is all about address space for caching user requests and > responses and back-end transactions. It is getting the right hardware > and software architecture to use the entire RAM optimally for serving > web pages. > > Ron > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > >
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