On Feb 5, 2014, at 8:50 PM, Bruce Adams wrote: > Modern JVM's pick default heap sizes based on the physical memory in > your machine. With more than 1GB of physical memory, initial heap is > 1/64 and maximum heap is 1/4 of physical memory.[1] > > For OpenJDK and Oracle, this command: > java -XX:+PrintFlagsFinal -version | grep HeapSize > will show the initial and maximum heap sizes (along with a few other > numbers).
Thanks Bruce. Do you happen to know if there's a way to specify different fractions? I'd like something more like 3/4 (or 7/8) than 1/4. Nothing else will be running on the machine (aside from the OS and maybe tiny other things), and I want it to take everything it might need. I realize I can hardcode specific sizes, but then I have to change it for every machine configuration it runs on, which is what I was hoping to avoid. I have 64GB on some of my machines, 12GB on others, etc., and I'd like to use most of what's available wherever I run, preferably without changing project.clj every time. > Also, you may not want to set the initial heap size as large as the > maximum heap size. Oracle[2] says (in part): > >> Setting -Xms and -Xmx to the same value increases predictability by removing >> the most important sizing decision from the virtual machine. However, the >> virtual machine is then unable to compensate if you make a poor choice. The choice of using the same, maximal limit for both -Xms and -Xmx, could only be poor in the sense of using more than the necessary memory, right? Since I'm happy to use every available byte and am only concerned about speed it seems like this should be okay. Thanks, -Lee -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
