Hi Gracelin, Ignite uses Runtime.getRuntime().maxMemory() to show heap size. For -Xmx20g JVM returns 18GB. So it depends on the -Xmx that you pass to JVM, but as you can notice it doesn't absolutlly equal to what return Runtime.getRuntime().maxMemory().
Thanks, Mikhail. On Fri, Jul 14, 2017 at 10:13 AM, Gracelin Priya <[email protected]> wrote: > Hi, > > > > I am starting gridgain using a java program as given below > > > > try { > > ignite = Ignition.start("/opt/GridGain/ > config/default-server.xml"); > > > > } catch (Exception ex) { > > ex.printStackTrace(); > > } > > > > The above program is executed using the below command to start the ignite > server. In default-server.xml no other configuration is given except > IPAddress in TCPDiscoverypi. > > ==================================================================== > > /usr/java/jdk1.8.0_121/bin/java -classpath .:./*:$IGNITE_HOME/libs/*:$ > IGNITE_HOME/libs/ignite-spring/*:$IGNITE_HOME/libs/ > ignite-rest-http/*::$IGNITE_HOME/libs/ignite-indexing/* <classfilename> > > > > [12:04:13,973][INFO][main][GridDiscoveryManager] Topology snapshot > [ver=1, servers=1, clients=0, CPUs=32, heap=25.0GB] – > > > > How is this 25GB derived? In another machine with lower memory I tried and > it is seen it is taking 3 GB there. Can someone please explain how the heap > 25GB is taken by default in this system. > > > > Top output from the system for the java process which started the gridgain > server is given below > > > > top - 12:13:41 up 1 day, 23:37, 3 users, load average: 1.12, 1.19, 1.00 > > Tasks: 24 total, 1 running, 23 sleeping, 0 stopped, 0 zombie > > %Cpu(s): 2.1 us, 1.1 sy, 0.0 ni, 96.7 id, 0.0 wa, 0.0 hi, 0.1 si, > 0.0 st > > KiB Mem : 11741217+total, 10124566+free, 8303980 used, 7862532 buff/cache > > KiB Swap: 2097148 total, 2097148 free, 0 used. 10860382+avail Mem > > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > > 7677 root 20 0 39.875g 462556 14732 S 0.7 0.4 0:16.86 java > > > > -Xmx20G is set in java > > > > /usr/java/jdk1.8.0_121/bin/java -DIGNITE_QUIET=false -verbose:gc -Xmx20g > then heap is 18GB. > > > > [12:38:46,153][INFO][main][GridDiscoveryManager] Topology snapshot > [ver=1, servers=1, clients=0, CPUs=32, heap=18.0GB] > > > > top - 12:40:08 up 2 days, 3 min, 2 users, load average: 1.63, 1.33, 1.10 > > Tasks: 22 total, 1 running, 21 sleeping, 0 stopped, 0 zombie > > %Cpu(s): 4.8 us, 1.3 sy, 0.0 ni, 93.7 id, 0.1 wa, 0.0 hi, 0.1 si, > 0.0 st > > KiB Mem : 11741217+total, 10140552+free, 8137208 used, 7869452 buff/cache > > KiB Swap: 2097148 total, 2097148 free, 0 used. 10877128+avail Mem > > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > > 8097 root 20 0 31.589g 424924 14696 S 1.0 0.4 0:11.64 java > > > > > > > -- Thanks, Mikhail.
