[padb-users] configuration file format.

[Ashley Pittman]

On 23 Nov 2010, at 15:38, Daniel Kidger wrote:

> Ashley,
> Is Clustershell quite new?

It's been around for at least a year or so but I've yet to use it.

> and how does it compare / contrast with LLNL's pdsh ? perhaps on extreme scalability?

Mainly the scalability I believe, pdsh has a "sliding window" of hosts it targets at any one time and as one completes it moves onto the next, the size of this window is the "fanout" parameter.  This worked well for padb in the 2.x days but now there is full-duplex communication between the inner and outer processes all inner processes have to run simultaneously.

I'm told that clustershell works by calling itself recursively on remote nodes so can scale to much larger hostcounts and still run all commands simultaneously.

> I understand that Clustershell is by Stéphane Thiell of the CEA. 
> (which have mostly Bull hardware so slightly surprised I haven't heard of clustershell before).
> 
> CEA wrote Shine for Lustre management - I think Clustershell underpins it?

It's a part of this project, yes.

Ashley.

-- 

Ashley Pittman, Bath, UK.

Padb - A parallel job inspection tool for cluster computing
http://padb.pittman.org.uk