[mvapich-discuss] Is negative host_id number from gethostbyname() a problem?

[Terrence.LIAO at total.com]

Professor DP,

Yes,  we are aware of the Qlogic driver on PSM and your make.mvapich.psm . 
 We choose GEN2 for two reasons: 
1. The OFED stack seems work fine with our luster system.  We have a tough 
time to make our lustre to talk to cluster via IB, with this OFED GEN2, we 
can do it.
2. Our infinipath card is old (or ancient!) about 3 years old, before 
Qlogic bought infinipath.  I am not sure PSM will work on it. 
Our application (seismic apps solving wave equations) is IO intensive, we 
believe we can scarify the MPI performance a little and potentially gain 
more from IO performance with lustre on IB. Of course, if PSM works on the 
lustre driver too, this will be a perfect solution.

Thank you very much for your many help.

-- Terrence






Dhabaleswar Panda <panda at cse.ohio-state.edu> 
10/30/2008 02:09 PM

To
Terrence.LIAO at total.com
cc
mvapich-discuss at cse.ohio-state.edu, Brian Stevens <brian at stevens.com>, 
<John.WANG at total.com>
Subject
Re: [mvapich-discuss] Is negative host_id number from gethostbyname() a 
problem?






Hi Terrence,

Thanks for your report. We are taking a look at it. It looks like you are
using make.mvapich.gen2 to run your applications on systems with
infinipath HTX cards. Not sure whether you are aware of a different
interface in MVAPICH 1.1 which is specifically designed for infinipath
cards. This design is on top of the PSM layer provided by QLogic and
delivers better performance. You need to use make.mvapich.psm script for
this. More details are available in mvapich 1.1 user guide from the
following URL:

http://mvapich.cse.ohio-state.edu/support/mvapich_user_guide-1.1.html#x1-120004.4.3


Thanks,

DK


On Thu, 30 Oct 2008 Terrence.LIAO at total.com wrote:

> Dear Mvapich,
>
> I am building mvapich-1.1rc1 for infinipath HTX card with CentOS5.2 and
> OFED1.4 using make.mavpich.gen2.  The build is successfully, but the run
> fails,  it never passes the MPI_Init().  It seems fall into an infinite
> loop.   I check the gethostbyname() using this code
>                  struct hostent *he;
>                  he = gethostbyname (myname);
>                  int host_id = ((struct in_addr *)
> he->h_addr_list[0])->s_addr;
>                  printf("host_id: %d\n", host_id);
>
> and get
>                 host_id: -486364992
>
> Will this the root cause, and any advice what I should do to fix this
> problem?
>
>
> Thank you very much.
>
> -- Terrence
> --------------------------------------------------------
> Terrence Liao, Ph.D.
> Research Computer Scientist
> TOTAL E&P RESEARCH & TECHNOLOGY USA, LLC
> 1201 Louisiana, Suite 1800, Houston, TX 77002
> Tel: 713.647.3498  Fax: 713.647.3638
> Email: terrence.liao at total.com
>
>
>

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