[MITgcm-devel] [MITgcm-cvs] MITgcm/doc CVS Commit

[Martin Losch]

Hi Jean-Michel,

I agree with your conclusions.

M.

On Oct 19, 2012, at 5:49 PM, Jean-Michel Campin wrote:

> Hi Martin,
> 
> Thanks for doing these tests.
> My take out from this is:
> 1) this reinforce the choice to have W2_USE_E2_SAFEMODE defined as the
> default (whereas with the old version, the slow down was significant, 
> and this default was more problematic).
> 2) it's still faster with W2_USE_E2_SAFEMODE #undef, so I guess it's worth
> to keep this option (we could have decided to remove this option and to
> keep the part of the code corresponding to #define W2_USE_E2_SAFEMODE).
> 
> Thanks,
> Jean-Michel
> 
> On Fri, Oct 19, 2012 at 04:19:04PM +0200, Martin Losch wrote:
>> I can now add this:
>> 
>> I ran the CS150 with 6 cpu (on per face) with exch2_put_rx2.template version 1.4 (SAFEMODE defined) and 1.3 (SAFEMODE undefined) with a simple ftrace analysis and am getting this:
>> FREQUENCY  EXCLUSIVE       AVER.TIME    MOPS  MFLOPS V.OP  AVER.   VECTOR I-CACHE O-CACHE    BANK  PROG.UNIT           TIME[sec](  % )    [msec]                 RATIO V.LEN    TIME   MISS    MISS      CONF
>> 
>> 1311552   271.006(  2.7)     0.207  6305.2   166.1 95.55  99.5  268.974  1.1314  0.1703  0.0397  exch2_put_rl2 (r1.4)
>> 1311552    60.982(  0.6)     0.046  2552.4   738.3 57.95  15.5   59.130  1.0930  0.0497  0.0649  exch2_put_rl2 (r1.4 W2_USE_E2_SAFEMODE undefined)
>>  1311552  6055.632( 36.8)     4.617   133.6     7.6  0.07 204.0    4.536  3.2848 4629.3812 1190.0043  exch2_put_rl2 (r1.3 W2_USE_E2_SAFEMODE defined)
>> 1311552    54.211(  0.6)     0.041  2867.8   830.5 57.91  15.5   52.802  0.2240  0.4724  0.0663  exch2_put_rl2 (r1.3 W2_USE_E2_SAFEMODE undefined)
>> 
>> 
>> The total timing is (includes more effects than just that of exch2_put_rl2.F I assume)
>> r1.4 W2_USE_E2_SAFEMODE undefined: 1675.324
>> r1.4 W2_USE_E2_SAFEMODE   defined: 1735.251
>> r1.3 W2_USE_E2_SAFEMODE undefined: 1657.051
>> r1.3 W2_USE_E2_SAFEMODE   defined: 2789.741
>> 
>> So there's a clear improvement with r1.4 when W2_USE_E2_SAFEMODE is defined
>> 
>> M.
>> 
>> 
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