search

alibaba-edu / High-Precision-Congestion-Control

296 stars 153 forks source link

Large Topos? #9

Closed ChengjunJia closed 4 years ago

ChengjunJia commented 4 years ago

Have you tried extremely large topos? I found that Ptr rdmaHw = CreateObject() or sw->SetAttribute("CcMode", UintegerValue(cc_mode)) in third.cc would fail if the topo is more than 6K nodes.

liyuliang001 commented 4 years ago

Great question. We haven't tried. Would you mind sharing your topology with us so we can see what happens?

ChengjunJia commented 4 years ago

Unfortunately I encountered more questions. Pls find the topo and flows below. This topo consists of 4004 nodes, and it can be created without error, but running with only 1 flow leads to Segmentation fault.

If you notice, the topo is an asymmetric dumbbell topo, increasing the node num on the left side to 5000 or more, creating the topo will fail.

==========topo===========

4004 2 4003 4000 4001 0 4000 100Gbps 3.33us 0 1 4000 100Gbps 3.33us 0 ......(node 2-3997, are connected to 4000) 3998 4000 100Gbps 3.33us 0 3999 4000 100Gbps 3.33us 0 4000 4001 100Gbps 3.33us 0 4001 4002 100Gbps 3.33us 0 4001 4003 100Gbps 3.33us 0

==========flow============== 1 0 4002 3 100 2 0.001

liyuliang001 commented 4 years ago

Thanks for sharing. I tried to create 5000+ nodes and also fails. But I note that it consumes > 9Gb memory before crashes. I think this is an NS3 problem. Have you tried creating 5000+ or even more nodes in raw NS3?

From my experiences before, it seems NS3 will crash when it uses lots of memory.

ChengjunJia commented 4 years ago

Thanks. I will try.