Re: [Gems-users] Ruby_current_time

["Dan Gibson" <degibson@xxxxxxxx>]

Jesus,
I'm not entirely sure what you mean by 'different checkpoints', but this is a known behavior even with the same checkpoint and a different random seed. See Alameldeen et al.: Addressing Workload Variability in Architectural Simulations, in HPCA 2003 or Micro top picks of that year. (Here: http://www.cs.wisc.edu/multifacet/papers/by_topic.html#topic_method)

Basically, if even one processor, say, takes an interrupt and does something else for awhile, system-wide statistics change. This could be going on if you are indeed using different checkpoints. Can you please clarify what you mean by 'different checkpoints'? How do your two .check files differ?

Regards,
Dan

On Fri, Oct 17, 2008 at 5:51 AM, Jesús Camacho <jesuscamacho10@xxxxxxxxxxx> wrote:

Hi everybody,
I,m running a FFT simulation on Solaris9 using garnet tools.
If I run "./FFT -p16 -m16" from different checkpoints (but both from the same machine -Solaris9-) the ruby_current_time and other networks statics differs notably.
For example, between two different simulations with the same parameters (./FFT -p16 -m16) Network Statics are:

WITH FIRST SIMULATION:

Network Stats
-------------

Average Link Utilization :: 0.00318694 flits/cycle
-------------
Average VC Load [0] = 0.0383004 flits/cycle
Average VC Load [1] = 0.0384338 flits/cycle
Average VC Load [2] = 0.0382636 flits/cycle
Average VC Load [3] = 0.0383937 flits/cycle
Average VC Load [4] = 0.00280336 flits/cycle
Average VC Load [5] = 0.00280562 flits/cycle
Average VC Load [6] = 0.00280483 flits/cycle
Average VC Load [7] = 0.00280415 flits/cycle
Average VC Load [8] = 0.00482712 flits/cycle
Average VC Load [9] = 0.00482258 flits/cycle
Average VC Load [10] = 0.00481352 flits/cycle
Average VC Load [11] = 0.00478037 flits/cycle
Average VC Load [12] = 0.0699856 flits/cycle
Average VC Load [13] = 0.0694528 flits/cycle
Average VC Load [14] = 0.0683858 flits/cycle
Average VC Load [15] = 0.0672418 flits/cycle
Average VC Load [16] = 0 flits/cycle
Average VC Load [17] = 0 flits/cycle
Average VC Load [18] = 0 flits/cycle
Average VC Load [19] = 0 flits/cycle
-------------
Ruby_current_time: 70858800
Average network latency = 26.8642
-------------
Total Link Power = 0.113967 W
Total Router Power = 9.44946 W
-------------



WITH SECOND SIMULATION:

Network Stats
-------------

Average Link Utilization :: 0.00455201 flits/cycle
-------------
Average VC Load [0] = 0.0504177 flits/cycle
Average VC Load [1] = 0.0511613 flits/cycle
Average VC Load [2] = 0.0504452 flits/cycle
Average VC Load [3] = 0.0511084 flits/cycle
Average VC Load [4] = 0.00406614 flits/cycle
Average VC Load [5] = 0.00406986 flits/cycle
Average VC Load [6] = 0.00406815 flits/cycle
Average VC Load [7] = 0.00406722 flits/cycle
Average VC Load [8] = 0.00821589 flits/cycle
Average VC Load [9] = 0.00818839 flits/cycle
Average VC Load [10] = 0.00814064 flits/cycle
Average VC Load [11] = 0.00808597 flits/cycle
Average VC Load [12] = 0.102727 flits/cycle
Average VC Load [13] = 0.101945 flits/cycle
Average VC Load [14] = 0.100312 flits/cycle
Average VC Load [15] = 0.09847 flits/cycle
Average VC Load [16] = 0 flits/cycle
Average VC Load [17] = 0 flits/cycle
Average VC Load [18] = 0 flits/cycle
Average VC Load [19] = 0 flits/cycle
-------------
Ruby_current_time: 50830773
Average network latency = 25.8351
-------------
Total Link Power = 0.162784 W
Total Router Power = 13.0997 W
-------------


I think the difference in Ruby_current_time between two simulations is not normal.
Anyone help me?
Thank you very much,
Jesús CV.

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