NEM Supernode Rewards Program


Might be the garbage collector doing its work. You might want to restart NIS or upgrade to 8GB and use G1 garbage collector.


I’ve just restarted NIS and increased memory allocated to Java to 3200 MB from 3072 MB. Would removing the garbage collector line from the nis startup script help if it’s caused by GC?


I don’t think that will help since the node is probably using swap memory which is very slow.

Not sure you mean “removing the garbage collector”.


There was some text you asked me to add ending in GC.txt in the file a while ago, I meant starting NIS without the garbage collector text.


That may be the use of the G1 garbage collector, i can’t tell without seeing the actual
Restarting NIS probably already has the GC.txt overwritten, else i could have taken a look at it to see how much your NIS was under pressure memorywise.
Removing the additional startup param for the garbage collector only results in the use of the default garbage collector which is not better.
Increasing memory is probably the best option.


Hi, the additional text at the end of the startup script was as below:

-XX:+UseG1GC -XX:MaxGCPauseMillis=200 -XX:+PrintGC -Xloggc:"./gc.txt"

I presume this is the G1 collector.


Yes. So unless your provider is the culprit of poor computing power results, the only option would be to increase memory.


It seems that the balance check did not work.

It seems to be restored now.


the problem I think does not fixed yet


Yeah, I observed exactly the same problem - it failed for balance in round #4679 and #4680, even if balance is - of course - right (over 3mio XEM). If this happened (happens) only for a part of supernodes, I hope it will be recalculated for the right reward after solving this issue.

And anyway, about the rewards - I’m still waiting for the payout for rounds #4673-#4676. It should came yesterday (2019-03-14) around 14:00-15:00 GMT, but nothing arrived. Did anybody has the same experience ?


Reason for the failures were that i needed to restart the local NIS on the node rewards master. I will check on weekend which nodes suffered from that problem and issue the missing payouts.


why some nodes had paid at 4677-4680 for 838?
seems stuck at number 167


Are there any recommendations on providers for hosting a node? Preferably ones with pre-configured nodes if possible, I think I vaguely remember have a pre-installed supernode server which just requires configuration with your settings. I’ve also seen recommendations of people recommending vultr.


Hi, I do not know if you know the page. Here you have an overview of all used ISP´s (NEM Blockchain).

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Thanks, looks like vultr is most popular.


not sure about OS though, seems like there’s a lot of options in vultr, like debian, ubuntu, fedora, centos etc. Thinking of going for the 8GB to future proof it. VC2 $40 per month. Is there still a tutorial available, I used Pauls one last time, not sure if it’s still valid though.


That’s the good thing about Linux, but it also has a few disadvantages.
Everyone has a slightly different configuration.
I think most used ubuntu / debian. . … centos… . . Fedora…etc.
Actually only the main settings(Ports, etc.) are the same, the rest is a question of opinion and comfort…


Here is the list of additional payouts for the nodes that suffered from the NIS restart on the node rewards server in round 4679:

payouts.pdf (89.5 KB)


I can confirm that this payout has been received. Many thanks, BR, for all your work around SuperNodes and rewards program!


There were some balance tests failing in round 4702 due to the local node-rewards NIS doing a full garbage collection. Here are the additional payouts for those nodes:

payouts.pdf (52.3 KB)