Re: [gmx-users] No improvement in scaling on introducing flow control

himanshu khandelia wrote: Hi Carsten, The benchmarks were made is 1 NIC/node, and yet the scaling is bad. Does that mean that there is indeed network congestion ? We will try using back to back connections soon, Hi Himanshu, In my opinion the most probable scenario is that the bandwidth of

Re: [gmx-users] No improvement in scaling on introducing flow control

Hi Carsten, The benchmarks were made is 1 NIC/node, and yet the scaling is bad. Does that mean that there is indeed network congestion ? We will try using back to back connections soon, -himanshu maybe your problem is not even flow control, but the limited network bandwidth which is shared

[gmx-users] No improvement in scaling on introducing flow control

Hi, We tried turning on switch control on our local cluster (www.dcsc.sdu.dk) but were unable to achieve any improvement in scale up whatsoever. I was wondering if you folks could shed light upon how we should go ahead with this. (We have not installed the all-to-all patch yet) The cluster

Re: [gmx-users] No improvement in scaling on introducing flow control

Hi Himanshu, maybe your problem is not even flow control, but the limited network bandwidth which is shared among 4 CPUs in your case. I also have done benchmarks on Woodcrests (2.33 GHz) and was not able to scale an 8 atom system beyond 1 node with Gbit Ethernet. Looking in more detail, the

Re: [gmx-users] No improvement in scaling on introducing flow control

Hi Carsten, Thank you very much for the prompt reply. I know very little about network architecture, and therefore understand your explanation only partly. Based on what you say, however, would it be fair to conclude that on the quad core woodcrests, it will not be possible to improve scaleup

Re: [gmx-users] No improvement in scaling on introducing flow control

himanshu khandelia wrote: Hi Carsten, Thank you very much for the prompt reply. I know very little about network architecture, and therefore understand your explanation only partly. Based on what you say, however, would it be fair to conclude that on the quad core woodcrests, it will