Hello everyone !
Happy new year to you :)
Coming back from holidays, I've been doing some tests to run Pregel on
ArangoDB using a moderate dataset ( graph Around 50 millions nodes + edges
).
I just wanted to run a pagerank to see how the pregel execution behaves on
our server, so I launched a pregel job, it ran for one hour and when I
stopped it, I saw this warning into the logs :
2019-01-02T15:54:33Z [33639] WARNING {pregel} Aborted loading graph
It ran for a complete hour and yet the graph was still loading into memory
? What bothers me is that the server I'm using is quite powerful, its all
bare metal and the data are stored on local SSD with fast access, network
problem / bottleneck is non relevant.
So why does iotop shows that ArangoDB is only loading data at ~650
KiloBytes / s when it can go up to 30 MegaBytes / s !?
Loading data within the Pregel job seems to be monothread, fine. But still,
even in monothread it should be much faster,
What am i missing ?
Thank you for your answer,
Best Regards
Cyprien.
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