Dear Nu Community,
We are happy to announce that NuLagoon now is providing liquidity on HitBTC’s NBT/BTC pair. https://hitbtc.com/exchange/NBTBTC
HitBTC is a very nice and user-friendly exchange. We encourage people to have a try.
We will also keep supporting exchange Poloniex and keep putting our effort on improving the NuLagoon.
Thank you for your support.
NuLagoon manage team.
Dear NuLagoon,
@henry,
would you mind checking your NuBot settings?
It looks like your orders have a difference between buy and sell side of close to 3%.
ping @henry
NuLagoon’s NuBot on hitBTC seems to have failed. I’ve seen no orders for some time.
Currently there’s only my orders (all on buy side; sell side has been eradicated).
Thank you for letting us know. It stop working. Just restarted it.
Yes. It quit again. NuBot seems a little bit unstable. Maybe it’s because the memory of our VPS is completely consumed now. We will be trying to fix the problem today.
perhaps the same problem exists in poloniex bid wall?
Do you run the Nu client on the same machine? I have nud and NuBot running on the same RaspberryPi 2.
The 1 GB RAM of the RaPi is largely consumed by nud, but NuBot requires only little RAM.
However, NuBot does require some CPU power from time to time.
Here’s a part of a top output from my RaPi:
top -p $(pgrep -d',' "java|nud")
[...]
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2943 pi 20 0 325m 60m 5336 S 100.7 6.2 730:54.99 java
11455 pi 20 0 727m 593m 34m S 37.9 60.9 2596:16 nud
32186 pi 20 0 310m 22m 2428 S 0.0 2.4 51:23.94 javaAs you can see, NuBot requires approximately 62+24 MB RAM, nud approximately seven times that RAM (609 MB), but most of the CPU load gets created by java.
I recognized that the CPU load created by NuBot varies by order of magnitude. I’m not sure what’s causing that extraordinarily high load from time to time, but very often the CPU load is like this:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
11455 pi 20 0 727m 592m 34m S 35.2 60.9 2618:28 nud
2943 pi 20 0 325m 72m 5332 S 1.0 7.5 764:06.23 java
32186 pi 20 0 310m 22m 2428 S 0.0 2.4 51:24.18 javaMaybe your VPS makes trouble in times of spiking CPU load?
Can you order VPS upgrades that guarantee a minimum amount of CPU power?
I understand that running NuBot on a VPS is much more comfortable (uptime, backups, reliability) than running it on a physical device.
But I wouldn’t trust a VPS with the API credentials of an exchange nor the private key of a custodian address. For that reason running NuBot and nud on a VPS is no option for me.
Here is the output of
top -p $(pgrep -d',' "java|nud")
PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20 0 2185280 109272 9104 S 22.6 10.8 0:22.11 java
20 0 2185280 110832 8956 S 16.0 10.9 0:27.94 java
20 0 1452688 683700 18748 S 13.0 67.4 15:25.96 nud
Don’t know why it looks like our server’s memory is consumed more than yours.
server specs?
From the memory usage of nud I derive that the server has 1 GB RAM.
I wonder why your java processes require much more RAM than the ones on my RaPi.
You are very close to 100% RAM usage.
Is swap configured on that server? If not I wouldn’t wonder about trouble from RAM issues.
Did you start NuBot in server mode (-server)?
I run NuBot command line only (in a screen session; i don’t like the nohup way 
):
java -jar NuBot.jar -cfg config/hitbtc.jsonNo. I didn’t run in server mode. The command is just same as yours.
We will upgrade our server, and then see if the problem happen again.
What about swap?
swap size is 1.2 G
No clue then.
Upgrading the server might be the best option.
Dear NuBits enthusiasts!
Many thanks for liquidity support and your trust to HitBTC.
If you have any questions or suggestions, don’t hesitate to ask here.
Not a question for hitbtc, but for Nu:
Do we have an ALP wrapper? I can start getting setup for NuPond Term 6 on HitBTC.
Seems to be resolved?