Re: [bgl-discuss] crashes in VN mode

[Boyana Norris <norris@xxxxxxxxxxx>]

Andrew Siegel wrote:

> No, compilation shouldn't change for vn mode.
>
> As a general point that could relate to this question, it is probably a good
> idea to start more conservatively with the compiler flags before slowly
> exploring a few of the optimizations. For example, the compiler generation
> of the extended double-hummer instructions is very much a work in progress.
> Same goes for some other optimizations. I would start with just -O0 and
> qarch=440 as a first shot and see if the code executes. 

Apparently the problem was -qhot=simd (which is one of the first things 
I tried removing). Starting with few optimizations is what I would 
normally do, but I was a bit pressed for time, so I did it backwards.

> About debugging, Totalview has recently been ported and Livermore is using
> it. I'll look into if and when we can get our hands on it. 

Having totalview would be great.

Thanks,
Boyana

> -andrew
>
> -----Original Message-----
> From: owner-discuss@xxxxxxxxxxxxxxx [mailto:owner-discuss@xxxxxxxxxxxxxxx]
> On Behalf Of Boyana Norris
> Sent: Tuesday, February 08, 2005 5:02 PM
> To: discuss@xxxxxxxxxxxxxxx
> Subject: [bgl-discuss] crashes in VN mode
>
> I've been running some (16 and 32-processor) GYRO simulations, built with
> /home/norris/software/bin/mpif90 (rip-off of Satish's version, just
> changed from f77 to f90), and the following optimization options:
>
> -qbgl -qarch=440d -qtune=440 
> -qcache=level=1:type=i:size=32:line=32:assoc=64:cost=8 
> -qcache=level=1:type=d:size=32:line=32:assoc=64:cost=8 
> -qcache=level=2:type=c:size=4096:line=128:assoc=8:cost=40 -qhot=simd -O3
>
> This runs fine in coprocessor mode but crashes (with core dump) in vn mode
> after the initialization of the simulation otherwise.
>
> I'm starting to experiment with different compiler options, but wanted to 
> ask in the meanwhile if compiling with the intention of running in virtual 
> node mode is supposed to be done differently than when running in 
> coprocessor mode?
>
> Also, what debugger should I be using and how (in conjunction with 
> mpirun)? 
>
> Thanks!
> Boyana
>
> - --------------------------------------------------------------------
> To add or remove yourself from this mailing list, use the 'notifyme'
> command on any BGL machine. To remove: notifyme -n, to add: notifyme -y.

- --------------------------------------------------------------------
To add or remove yourself from this mailing list, use the 'notifyme'
command on any BGL machine. To remove: notifyme -n, to add: notifyme -y.