Re: [Beowulf] Varying performance across identical cluster nodes.

2017-09-13 Thread Christopher Samuel
On 14/09/17 03:48, Prentice Bisbal wrote: > What software configuration, either a kernel a parameter, configuration > of numad or cpuspeed, or some other setting, could affect this? Hmm, how about diff'ing "sysctl -a" between the systems too? Does one load new CPU microcode in whereas another

Re: [Beowulf] Varying performance across identical cluster nodes.

2017-09-13 Thread Michael Di Domenico
On Wed, Sep 13, 2017 at 2:45 PM, Joe Landman wrote: > FWIW: I gave up on NFS boot a while ago, due in part to problems with > performance that were hard to track down. The environment I created to do > completely ramboot boots at scale, allows me to pivot to NFS if

Re: [Beowulf] Varying performance across identical cluster nodes.

2017-09-13 Thread Joe Landman
FWIW: I gave up on NFS boot a while ago, due in part to problems with performance that were hard to track down. The environment I created to do completely ramboot boots at scale, allows me to pivot to NFS if desired (boot time switch). But I rarely use that. Pure ramboot has been a joy to

Re: [Beowulf] Varying performance across identical cluster nodes.

2017-09-13 Thread Scott Atchley
Are you logging something goes to the disk in the local case, but that is competing for network bandwidth when NFS mounting? On Wed, Sep 13, 2017 at 2:15 PM, Scott Atchley wrote: > Are you swapping? > > On Wed, Sep 13, 2017 at 2:14 PM, Andrew Latham

Re: [Beowulf] Varying performance across identical cluster nodes.

2017-09-13 Thread Scott Atchley
Are you swapping? On Wed, Sep 13, 2017 at 2:14 PM, Andrew Latham wrote: > ack, so maybe validate you can reproduce with another nfs root. Maybe a > lab setup where a single server is serving nfs root to the node. If you > could reproduce in that way then it would give some

Re: [Beowulf] Varying performance across identical cluster nodes.

2017-09-13 Thread Andrew Latham
ack, so maybe validate you can reproduce with another nfs root. Maybe a lab setup where a single server is serving nfs root to the node. If you could reproduce in that way then it would give some direction. Beyond that it sounds like an interesting problem. On Wed, Sep 13, 2017 at 12:48 PM,

Re: [Beowulf] Varying performance across identical cluster nodes.

2017-09-13 Thread Prentice Bisbal
Okay, based on the various responses I've gotten here and on other lists, I feel I need to clarify things: This problem only occurs when I'm running our NFSroot based version of the OS (CentOS 6). When I run the same OS installed on a local disk, I do not have this problem, using the same

[Beowulf] Julia Language

2017-09-13 Thread John Hearns via Beowulf
I see HPCwire has an article on Julia. I am a big fan of Julia, so though it worth pointing out. https://www.hpcwire.com/off-the-wire/julia-joins-petaflop-club/ Though the source of this seems old news - it is a presentation from this year's JuliaCon JuliaCon 2018 will be talking place at UCL in