P2D243

5MISCELLANEOUS
5.1PFC2D Runtime Benchmark
PFC2D has been tested on a number of different computers.The calculation rates are compared here for a packed assembly of1000particles.After compaction,the model is run for1000steps,and the rate is calculated by a FISH function.Note that the rate corresponds to the execution time for a packed assembly,which is typical of most PFC2D models.The datafile is given in Example5.1. Table5.1summarizes the calculation rates for different computers and different operating systems.
Example5.1Benchmark datafile—“timing.DAT”
;fname:timing.DAT(Data file for PFC timing test)
new
set random
def setup
width=20.0;Height of exclosing box
height=10.0;Width of enclosing box
poros=0.15;Desired porosity
num_ball=1000;Number of balls
rad_fac= 1.2;Ratio of max to min ball radius
nstiff=1e8;Normal stiffness
sstiff=0.5e8;Shear stiffness
ffric=0.2;Final friction coefficient
rmult= 1.5;Requested radius multiplier
end
setup
def make_model
tot_vol=width*height
sol_vol=tot_vol*(1.0-poros)
r_bar=sqrt(sol_vol/(num_ball*pi))
r_b_sm=r_bar/rmult
rlow= 2.0*r_b_sm/(1.0+rad_fac)
rhigh=rlow*rad_fac
end
make_model
wall id=1kn=nstiff ks=sstiff nodes0,0width,0
wall id=2kn=nstiff ks=sstiff nodes width,0width,height
wall id=3kn=nstiff ks=sstiff nodes width,height0,height
wall id=4kn=nstiff ks=sstiff nodes0,height0,0
gen id=1,num_ball rad=rlow,rhigh x=0,width y=0,height tries=250000
prop dens1kn=nstiff ks=sstiff
ini rad mul rmult
plot crea tim_plot
plot add wall green
plo add ball red
plo add cforce yell
def rate
rate=((t1-t0)/num_ball);units of[sec/ball]
end
def time0
t0=clock/100.0;value in seconds
end
def time1
t1=clock/100.0;value in seconds
end
;---Obtain initial compacted state
step500
prop fric=ffric
step500
;---Perform the timing test to give rate of a compacted assembly
time0
cyc1000
time1
print rate
return
Table5.1PFC2D runtime calculation rates
Computer Operating System sec/ball/1000steps(×10−2) Pentium4(2.26GHz)Win20000.106
Athlon1600(1.33GHz)Win20000.041
Pentium4(2.66GHz)WinXP0.036
5.2Error Reporting
Although PFC2D has been tested extensively,it is almost impossible to test all combinations of options available in a code as complex as PFC2D.For this reason,some errors may have evaded our notice.If you discover a genuine bug,please let us know as soon as possible so that we may correct it.
5.2.1Reporting via Internet
Itasca’s current Internet e-mail address is
icg@
Please include the same information requested on the error notification form(in Section5.2.2), followed by the contents of your datafile.
5.2.2Reporting via Fax
A sample form for you to copy and mail or fax to us is given on the next page.Pleasefill out the form completely,as this is the minimum information we will need tofind and correct the error.The samplefile should,if possible,contain the minimum number of commands necessary to produce the error.We may have to contact you for further information if we are unable to duplicate the error. Be aware that it is always possible that the error is peculiar to your hardware,making it impossible for us to duplicate.
5.3Technical Support Service
Itasca and its offices and agents will provide telephone support,at no cost,to assist code owners in the installation of Itasca codes on their computer system.Additionally,general assistance may be provided in aiding the owner to understand the capabilities of the various features of the code. However,no-cost assistance is not provided for help in applying an Itasca code to specific user-defined problems.
Questions should,in thefirst instance,be directed to the office or agent where PFC2D was purchased, from where it may be escalated to senior staff if necessary.
ERROR NOTIFICATION FORM
Found By:
Phone:Fax:
Email:
Computer:RAM:
PFC2D Data
Serial No.:Version*
Key No.:Options
Description:
*Type PRINT version to report your complete version number
Please attach a sample inputfile that produces the error.
Itasca Consulting Group,Inc.Phone:(1)612-371-4711
Mill Place Fax:(1)612·371·4717
111Third Avenue South,Suite450E-Mail:software@ Minneapolis,Minnesota55401USA Web:。