Hi David, > -----Original Message----- > From: David kerber [mailto:dcker...@verizon.net] > Sent: Thursday, May 29, 2014 3:35 PM > > I have found that under JRE 6 (haven't tested 7 for performance yet, > only functionality) that the server jvm gives me much better performance > for Tomcat than the client JVM does. > > However, I can only find a 64-bit server JVM for Java 7, while in Java > 6, there was both a 32-bit and 64-bit server JVM. Is there a 32-bit > server JVM for Java 7 that I'm just not seeing? I want to stick with > 32-bit because none of my apps use anywhere enough memory to need 64- > bit > addressing, and 32-bit is supposed to reduce the memory footprint a bit > and give slightly better performance. It also means I don't need 64-bit > ODBC DSNs, along with the 32-bit ones that some of my GUI apps need. > > Thanks for any links or into... > Dave
I don't know how it is on other OSes, but AFAIK for Windows, Oracle's JDK(32-bit and 64-bit) always contains a Server VM, whereas 32-bit JRE does not. On 64-bit JRE and JDK, only a Server JVM is available. However I don't know what is included in "Server JRE" that is also available for download. Example output when a 32-bit JDK (Java7) and 32-bit + 64-bit JRE (Java8) is installed: C:\>"C:\Program Files (x86)\Java\jdk1.7.0_60\jre\bin\java" -version java version "1.7.0_60" Java(TM) SE Runtime Environment (build 1.7.0_60-b19) Java HotSpot(TM) Client VM (build 24.60-b09, mixed mode, sharing) C:\>"C:\Program Files (x86)\Java\jdk1.7.0_60\jre\bin\java" -server -version java version "1.7.0_60" Java(TM) SE Runtime Environment (build 1.7.0_60-b19) Java HotSpot(TM) Server VM (build 24.60-b09, mixed mode) C:\>"C:\Program Files (x86)\Java\jdk1.7.0_60\bin\java" -version java version "1.7.0_60" Java(TM) SE Runtime Environment (build 1.7.0_60-b19) Java HotSpot(TM) Client VM (build 24.60-b09, mixed mode, sharing) C:\>"C:\Program Files (x86)\Java\jdk1.7.0_60\bin\java" -server -version java version "1.7.0_60" Java(TM) SE Runtime Environment (build 1.7.0_60-b19) Java HotSpot(TM) Server VM (build 24.60-b09, mixed mode) C:\>"C:\Program Files (x86)\Java\jre8\bin\java" -server -version Error: missing `server' JVM at `C:\Program Files (x86)\Java\jre8\bin\server\jvm.dll'. Please install or use the JRE or JDK that contains these missing components. C:\>"C:\Program Files\Java\jre8\bin\java" -version java version "1.8.0_05" Java(TM) SE Runtime Environment (build 1.8.0_05-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode) Regards, Konstantin Preißer --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
