Replaced istep_dump parameter variable with dump_cadence. This specif…

…ies the number of output steps between file dumps

src/io/io.f90

@@ -527,7 +527,7 @@ module subroutine io_param_reader(self, unit, iotype, v_list, iostat, iomsg)
                   call io_toupper(param_value)
                   param%out_stat = param_value
                case ("DUMP_CADENCE")
-                  read(param_value, *, err = 667, iomsg = iomsg) param%istep_dump
+                  read(param_value, *, err = 667, iomsg = iomsg) param%dump_cadence
                case ("CHK_CLOSE")
                   call io_toupper(param_value)
                   if (param_value == "YES" .or. param_value == 'T') param%lclose = .true.
@@ -672,8 +672,13 @@ module subroutine io_param_reader(self, unit, iotype, v_list, iostat, iomsg)
             iostat = -1
             return
          end if
-         if ((param%istep_out <= 0) .and. (param%istep_dump <= 0)) then
-            write(iomsg,*) 'Invalid istep'
+         if (param%istep_out <= 0) then
+            write(iomsg,*) 'Invalid ISTEP_OUT. Must be a positive integer'
+            iostat = -1
+            return
+         end if
+         if (param%dump_cadence < 0) then
+            write(iomsg,*) 'Invalid DUMP_CADENCE. Must be a positive integer or 0.'
             iostat = -1
             return
          end if
@@ -870,7 +875,7 @@ module subroutine io_param_writer(self, unit, iotype, v_list, iostat, iomsg)
          end if
 
          call io_param_writer_one("IN_FORM", param%in_form, unit)
-         if (param%istep_dump > 0) call io_param_writer_one("ISTEP_DUMP",param%istep_dump, unit)
+         if (param%dump_cadence > 0) call io_param_writer_one("DUMP_CADENCE",param%dump_cadence, unit)
          if (param%istep_out > 0) then
             call io_param_writer_one("ISTEP_OUT", param%istep_out, unit)
             call io_param_writer_one("BIN_OUT", param%outfile, unit)
@@ -1503,7 +1508,7 @@ module subroutine io_write_frame_system(self, param)
       logical                          :: fileExists
 
       param%nciu%id_chunk = self%pl%nbody + self%tp%nbody
-      param%nciu%time_chunk = max(param%istep_dump / param%istep_out, 1)
+      param%nciu%time_chunk = max(param%dump_cadence / param%istep_out, 1)
       if (lfirst) then
          inquire(file=param%outfile, exist=fileExists)
 

src/main/swiftest_driver.f90

@@ -72,7 +72,7 @@ program swiftest_driver
              tstop           => param%tstop, &
              iloop           => param%iloop, &
              istep_out       => param%istep_out, &
-             istep_dump      => param%istep_dump, &
+             dump_cadence    => param%dump_cadence, &
              ioutput         => param%ioutput, &
              display_style   => param%display_style, &
              display_unit    => param%display_unit)
@@ -81,7 +81,7 @@ program swiftest_driver
       t = t0
       iloop = 0
       iout = istep_out
-      idump = istep_dump
+      idump = dump_cadence
       nloops = ceiling((tstop - t0) / dt, kind=I8B)
       ioutput_t0 = int(t0 / dt / istep_out, kind=I8B)
       ioutput = ioutput_t0
@@ -123,6 +123,7 @@ program swiftest_driver
                ioutput = ioutput_t0 + iloop / istep_out
                call nbody_system%write_frame(param)
 
+
                tfrac = (param%t - param%t0) / (param%tstop - param%t0)
 
                select type(pl => nbody_system%pl)
@@ -148,11 +149,11 @@ program swiftest_driver
          end if
 
          !> If the loop counter is at the dump cadence value, dump the state of the system to a file in case it needs to be restarted
-         if (istep_dump > 0) then
+         if (dump_cadence > 0) then
             idump = idump - 1
             if (idump == 0) then
                call nbody_system%dump(param)
-               idump = istep_dump
+               idump = dump_cadence
             end if
          end if
       end do