Hi again I have found this article in the red hat kbase: http://kbase.redhat.com/faq/docs/DOC-6571 My particular case is this: CPU Kernel Application Virtual Address Size 64 bit 64 bit 32 bit 4GB So, I can use up to 4GB. My question now is, what happens if a process needs more memory. For example, I use vim to analize the log files of my application server. I have files larger than 4G, (almost 5GB). What does the kernel do in this case? swap? Greetings, ESG Hi, > > are you sure? you can address 4G but for the design of the kernel you only > have 2GB > > http://kerneltrap.org/node/2450 > http://web.archive.org/web/20080424081633/lwn.net/Articles/75174/ > > <http://web.archive.org/web/20080424081633/lwn.net/Articles/75174/> > thanks, > > ESG > > 2010/3/17 Nigel Wade <nmw@xxxxxxxxxxxx> > > ESGLinux wrote: >> > Hi, >> > >> > I´m reading a post about the memory use for a java application: >> > >> http://web.archive.org/web/20080313075240/http://goobsoft.homeip.net/Wiki.jsp?page=JavaDebianTuning >> > >> > and there is a thing that surprise me: >> > Read this and to the point where you understand that a 32-process on >> Linux >> > only has 2GB of addressible space. In fact, back in 1999, Linus decreed >> that >> > 32-bit Linux would never, ever support more than 2GB of memory. "This is >> not >> > negotiable." >> > >> > So I have a machine running RHEL x64 but I have a process that run over >> > only 32 bit (the JVM), Reading this I think my process only can use 2Gb >> of >> > memory. >> > >> > is it true? is it oficial documented anywhere? >> > >> > Thanks in advance, >> > >> > ESG >> >> >> No, the 32bit address space limit is 4GB, not 2GB. >> >> $ java -Xmx3500m -version >> java version "1.6.0_15" >> Java(TM) SE Runtime Environment (build 1.6.0_15-b03) >> Java HotSpot(TM) Server VM (build 14.1-b02, mixed mode) >> >> $ java -Xmx4500m -version >> Invalid maximum heap size: -Xmx4500m >> The specified size exceeds the maximum representable size. >> Could not create the Java virtual machine. >> >> If you want more address space than this use a 64bit JVM. >> Using a 64bit JVM then: >> >> $ java -Xmx4500m -version >> java version "1.6.0_17" >> Java(TM) SE Runtime Environment (build 1.6.0_17-b04) >> Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode) >> >> -- >> Nigel Wade, System Administrator, Space Plasma Physics Group, >> University of Leicester, Leicester, LE1 7RH, UK >> E-mail : nmw@xxxxxxxxxxxx >> Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555 >> >> -- >> redhat-list mailing list >> unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe >> https://www.redhat.com/mailman/listinfo/redhat-list >> > > -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
