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seen Jul 3 '14 at 3:55

Jun
22
awarded  Commentator
Jun
22
comment Optimizing Linux Compute Cluster
You were right, when iperf was run on all the nodes at once, the bandwidth dropped down to about 50 Mbits/sec.
Jun
22
comment Optimizing Linux Compute Cluster
I ran iperf and none of the compute nodes seem to have an issue (they were all over 900 Mbits/sec). Do you have any other suggestions?
Jun
22
comment Force program to use only specific local port
Is it a program that you are writing or an existing program? I don't think you can do this without changing the source code of the program. Also, why do you want to do this? Keep in mind that the reason that TCP/IP clients use random local ports is so that they don't have to deal with a port being busy. If you assign the program to only use a specific port, only one process will be able to make a request at one time.
Jun
20
answered Apache VirtualHost on Ubuntu 11.04
Jun
20
comment missing entry in sudoers file
@Ziplin - I know, but at the time I posted this answer I did not have enough reputation to comment. It is generally not a good idea to give a web server any sort of root permissions unless absolutely necessary.
Jun
20
comment Optimizing Linux Compute Cluster
As for the network setup. The private network uses Gigabit ethernet, dedicated to the 16 compute nodes and the head node. It uses a netgear JGS524 switch.
Jun
20
comment Optimizing Linux Compute Cluster
Where is iperf located? It doesn't seem to be on my path.
Jun
20
comment Optimizing Linux Compute Cluster
Yeah, I know, that's what my boss said. Instead the performance goes in the opposite direction. With just one processor, it get 8 Gflops, but with 128 processors it gets only 30 Mflops.
Jun
20
awarded  Student
Jun
20
answered missing entry in sudoers file
Jun
20
comment Optimizing Linux Compute Cluster
As for the results of the HPCC benchmark. I've put them here. I ran the benchmarks using 128 processes on 16 8-core compute nodes.
Jun
20
comment Optimizing Linux Compute Cluster
Wilshire, thanks for your answer. I didn't set up the networking (it was setup before I started) so I'm not really sure about the specifics. I'm pretty sure it is a latency issue but I am not certain how to fix that. I'll talk to my boss about the networking and see if he can answer your questions.
Jun
20
answered How to save + close file when editing in bash?
Jun
20
asked Optimizing Linux Compute Cluster
Jun
16
answered Protecting Source Code From Certain Users in Linux
Jun
12
awarded  Teacher
Jun
12
answered Enabling remote access to mysql on debian