[CHiPPS] Blis install error

[Jack Bryan]

thanks a lot !!! 

I launch mpd --ncpus=2
then

mpdboot -n 20 -f /home/mpd.hosts

My MPI cluster has 33 nosts.
But only 20 hosts can be used, each host has 2 CPUs. 

Thus, I can not use more than 40 processes in parallel.

In this way , May I claim that I can use 40 processes in parallel ?

(1)
I run the program in this way : 

time mpiexec -l -n 40 blis -par /home/chipps_blis_svn_trunk_090423/blis_trunk/blis.par -Alps_instance 

bienst1.mps > bienst1_np_40_out_1

For bienst1.mps, 

In Blis0.9 (Intel(R) Xeon(TM) CPU 3.06GHz, cache  512 KB), I got "Search wallclock  = 275.889 seconds".
 
In CPLEX (Intel(R) Xeon(TM) CPU 2.40GHz, cache  512 KB) , I got Solution time 535.42 sec. 

How to check the CPUs usage to know how many processors are used ? 

(2)
And, 
Search CPU time = 12.6601 seconds, max = 265.293, min = 12.6591,

Search wallclock  = 275.889 seconds, max = 275.852, min = 275.838

Here, the "min " of CPU time is much smaller than the "max" time, 
does it mean that some CPUs are idel ? their work load are not balanced ?

(3)
How to check CPU time of each host ? 

I will get a machine with 400 nodes, each of which has 2 Quad cores.

May I expect I can get more than 100 ave. speedup from it ?

(4) what is the difference between local machine and local host ?
In my mpd.host file , I listed 20 hosts, each of them has 2 CPUs. 


Any help is appreciated. 

April 24  2009

From: Yan.Xu at sas.com
To: dtustudy68 at hotmail.com; chipps at list.coin-or.org
Date: Fri, 24 Apr 2009 14:47:16 -0400
Subject: RE: Blis install error



















For some instances, you might not observe speedup, it depends
the properties of the instances, machined used and algorithm implementation.
Blis is not suitable for 2-processor-run because the Master doesn’t
processing nodes. It is designed for massive parallel computing (several dozen
~ thousands processors).  You need find the right machine to do the test.

 

You can check the CPUs usage to know how many processors are
used.

 

What’s the specification of your machine?

 

Yan

 





From: Jack Bryan
[mailto:dtustudy68 at hotmail.com] 

Sent: Thursday, April 23, 2009 11:37 PM

To: Yan Xu; chipps at list.coin-or.org

Subject: RE: Blis install error





 



I have run some milp models in Blis 0.9, but I found that the more processes I
use, 



the longer run-time.



I run in this way:



mpiexec -1 -l -n 10 blis p0033.mps



                 
         Blis time   
     Blis time         Blis time

        cplex time     2
processes     6 processes    10 processes

p0033  0.04 sec     
0.094985        0.280955   
    0.953854



        
                  
Blis time       Blis time    
    Blis time

       cplex time     2
processes   10 processes    20 processes

bell5   0.85 sec       
46.022        
90                
111





Did I do something wrong ?  



How to make sure that I really use the number of processes that are indicated 

in the command line ? 



Only by Alps0050I Launched number of  processes  ? 



How to guarantee that the application program is really run in parallel on 

different processors not on one processor ? 



Any help is appreciated. 



thanks

April 23  2009 







From: Yan.Xu at sas.com

To: dtustudy68 at hotmail.com; chipps at list.coin-or.org

Date: Thu, 23 Apr 2009 15:02:18 -0400

Subject: RE: Blis install error



In log, you can find

 

Reading in ALPS parameters ...

Reading in BLIS parameters ...

Alps0110I ALPS version 1.0 (Parallel, MPI)

Alps0050I Launched 2 processes

Alps0030I Data file: p0033.mps



  

Regards,

Yan

 
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