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Posted to user@ignite.apache.org by Gracelin Priya <gp...@kodiakptt.com> on 2017/07/14 07:13:49 UTC
Heap Memory Allocation
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
Re: Heap Memory Allocation
Posted by Mikhail Cherkasov <mc...@gridgain.com>.
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 <gp...@kodiakptt.com>
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.