[FLASH-USERS] overwriting of snapshots

[Eddie Hansen]

Try adding the runtime parameter 'rolling_checkpoint' to your flash.par and
set it > 10000. The default value is 10000, which means the code will only
generate 10000 checkpoint files, and when it gets to the 10000th file
output it will reset back to 0 and start overwriting old checkpoint files.
The feature is intended to safeguard against using too much disk space, but
if this is not a concern for you then set it > 10000.

On Tue, Nov 12, 2019 at 3:15 PM guido <g.granda at irya.unam.mx> wrote:

> Hello,
>
> I guess this happens because flash only allows snapshots numbers of 4
> digits.
>
> Cheers,
>
> On 12/11/19 14:29, guido wrote:
> > Hello Flash users,
> >
> > I found out that one simulation is overwriting the last snapshot
> > instead of writing new ones. I think this very strange because this
> > did not happen with previous snapshots.
> >
> > The code keeps writing the snapshot 9999 instead of creating the 10000
> > one.
> >
> > The flash.par used for this simulation is the following:
> >
> > # Runtime parameters for a generic problem
> > # check the online documentation for runtime parameter descriptions
> > # or look at the setup_params file in the object directory for
> > # descriptions of parameters specific to your simulation
> >
> > #       Computational volume parameters
> > #               Grid parameters
> > geometry        = "cartesian"
> > #               Size of computational volume
> > xmin            = -10.0
> > xmax            =  10.0
> > ymin            = -0.6
> > ymax            =  0.6
> > #zmin            = -0.6
> > #zmax            =  0.6
> > # Runtime Parameters
> > sim_rho    =1.0
> > sim_vy     =0.0
> > sim_vz     =0.0
> > sim_by     =0.0
> > sim_bz     =1.0 # this is just a factor
> > sim_x_cent =0.0
> > sim_y_cent =0.0
> > sim_z_cent =0.0
> > sim_p      =1.0
> > sim_cs     =1.0 # check polytropic constant
> >
> > #sim_z_cent     =0.0
> > #               Boundary conditions
> > zl_boundary_type               = "periodic"
> > zr_boundary_type               = "periodic"
> > xl_boundary_type               = "outflow"
> > xr_boundary_type               = "outflow"
> > yl_boundary_type               = "periodic"
> > yr_boundary_type               = "periodic"
> >
> > #       Simulation (time, I/O) parameters
> >
> > cfl             = 0.8
> > basenm          = "ha_iso_"
> > stats_file      = "ha_iso.dat"
> > nend            = 1000000
> > tmax            = 3.155760e14 #10 Myr
> > dtinit          = 1.0e-3 #e-3 Myr
> > dtmax           = 3.155760e12 #e-1 Myr
> > dtmin           = 3.155760e-70 #
> >
> > #to write a checkpoint when dt< dtmin
> > dr_dtMinBelowAction = 1
> >
> > restart         = .true.
> > checkpointFileNumber= 188
> > plotfileNumber= 941
> > #       checkpoint file output parameters
> > checkpointFileIntervalTime = 3.155760e13 # 1Myr
> > checkpointFileIntervalStep = 50
> > #       plotfile output parameters
> > plotfileIntervalTime = 3.155760e12 #0.1 Myr
> > plotfileIntervalStep = 10
> >
> > #       variables to output to plotfiles
> > plot_var_1 = "dens"
> > plot_var_2 = "pres"
> > plot_var_4 = "eint"
> > plot_var_5 = "velx"
> > plot_var_6 = "vely"
> > plot_var_7 = "velz"
> > plot_var_8 = "magx"
> > plot_var_9 = "magy"
> > plot_var_10= "magz"
> >
> > # small variables
> > small      =  1.0e-40
> > smlrho     =  1.0E-40
> > smallp     =  1.0E-22
> > smalle     =  1.0e-10
> > smallt     =  1.
> > smallu     =  1.0E-40
> > smallx     =  1.0E-10
> > #      logfile parameters
> > run_comment     = "harris current sheet"
> > log_file        = "ha_iso.log"
> >
> > #    common eos parameters
> > eintSwitch     = 1.0E-4
> > eosMode        ="dens_pres"
> >
> > #    AMR refinement parameters
> > lrefine_max       =6
> > lrefine_min       =6
> > refine_var_1      = "dens"
> > #delta_ref         =0.01
> > #delta_deref       =-0.01
> > #reference_density =2.12e-24 # unperturbed initial density
> > refine_var_thresh     = "dens"
> > #USM parameters
> > killdivb = .true. # default true
> > flux_correct = .true.
> > Nblockx         = 1
> > Nblocky         = 1
> > Nblockz         = 1
> >
> > # === Polytropic EOS ===
> > usePolytrope     = .true.
> > PolytropeDens1   = 0.0
> > #PolytropeDens2   = 1e99
> > #PolytropeDens3   = 1e99
> > #PolytropeDens4   = 1e99
> > #PolytropeDens5   = 1e99
> > PolytropeGamma1  = 1.0
> > #PolytropeGamma2  = 1.0
> > #PolytropeGamma3  = 1.0
> > #PolytropeGamma4  = 1.0
> > #PolytropeGamma5  = 1.0
> > PolytropeKonst   = 1.0 # sound speed squared (cs^2)
> >
> > Do you see anything in my flash.par that might cause this error? I'm
> > using flash 4.5 by the way.
> >
> > Kind Regards,
> >
>


-- 
Eddie Hansen, PhD
Postdoctoral Scholar
University of Chicago
607-341-6126 | Flash Center
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://flash.rochester.edu/pipermail/flash-users/attachments/20191112/5b0ac9be/attachment.htm>