The behavior without xmx is actually pretty reasonable. Note that the default of half is only up to a few hundred MB of memory (not GB). Even when lots of memory is allocated, the jvm avoids expanding the actual use beyond reasonable need.
On Thu, Nov 10, 2011 at 8:35 PM, Camille Fournier <cami...@apache.org>wrote: > Btw I'm pretty sure res is used heap and virt is just mapped but yet to be > filled. Use jstat -gc to see actual usage for the various collectors. > > Also, if it's true that the jvm defaults to a xmx of half the ram (wtf bad > decision) we had better ship zk start scripts with more reasonable xmx > configured. > Although I've used u18 and u23 extensively on 64bit servers and never seen > it default to half the physical memory, or 32gig. > > C > > From my phone > On Nov 10, 2011 6:50 PM, "Ed Sexton" <sextonhad...@gmail.com> wrote: > > > Hi Henry, > > > > I checked the process listing via ps and top, and saw VIRT=6477m and > > RES=83m. > > > > How would one check if it is the jvm heap vs mapped space? > > > > Thanks as always Henry. > > Ed > > > > On Thu, Nov 10, 2011 at 2:04 PM, Henry Robinson <he...@cloudera.com> > > wrote: > > > > > Ed - how are you making the observation that the heap size is 6477m? Is > > it > > > from a profiler, or from top or similar? The amount of virtual memory > > > mapped for Java processes can often be very large, especially on recent > > > RHEL systems with the new arena allocator in glibc. Worth checking > > whether > > > it's the JVM heap or the amount of mapped space. > > > > > > cheers, > > > Henry > > > > > > On 10 November 2011 13:47, Ed Sexton <sextonhad...@gmail.com> wrote: > > > > > > > Hello Group- > > > > > > > > I am running CDH zookeeper version 3.3.3+12.12 and noticed that > > zookeeper > > > > is running with a heapsize of 6477m. > > > > > > > > I start zookeeper standalone, via > /etc/init.d/hadoop-zookeeper-server. > > I > > > > do not see reference to any ZOOKEEPER_HEAPIZE in the startup or > > zoo.cfg, > > > > nor do I see any special JVMFLAGS in export/usr/bin/zookeeper-server, > > > which > > > > is what is called by the startup script, it just has this definition: > > > > > > > > JVMFLAGS=-Dzookeeper.log.threshold=INFO > > > > > > > > Can someone guide me to where the 6GB heapsize is being referenced? > > This > > > > seems a bit large of a heap. > > > > > > > > Thanks for your guidance. > > > > > > > > Sincerely, > > > > Ed > > > > > > > > > > > > > > > > -- > > > Henry Robinson > > > Software Engineer > > > Cloudera > > > 415-994-6679 > > > > > > > > > > > -- > > Sincerely, > > Ed Sexton > > e: sextonhad...@gmail.com > > gv: (408) 475-2358 > > >
