Solved

Help with stop - start of a loop

Posted on 2008-06-14
6
225 Views
Last Modified: 2010-04-24
Hi All

I have the following attached loop that runs through 300+ mil loops generated from 3 Lists of string.

District, inner & ending

Is there any way to save the current position from the "For each .. as string in .." and then load the position back in ? Just that I have an estimated run time of 500+ hours and would like to be able to resume from a stored position should I have to.

I am also opened to other ideas aswell :-)

Many Thanks
Steve

Dim District, Inner, Ending As New List(Of String)
 
        District = DistrictList()
        Inner = InnerList()
        Ending = EndingList()
 
        For Each d1 As String In District
            s1 = d1
            For Each i1 As String In Inner
                s2 = s1 & i1
                For Each e1 As String In Ending
                    s3 = s2 & " " & e1
 
                    While pauseLoop
                        System.Threading.Thread.Sleep(100)
                        Application.DoEvents()
                    End While
 
                    Application.DoEvents()
 
                Next
            Next
        Next

Open in new window

0
Comment
Question by:Stephen Manderson
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 143

Assisted Solution

by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 100 total points
ID: 21785330
let's assume that the Distrinctlist, InnerList and EndingList are sorted (if not, that will be "required")

then, you have only to check if the loop's control variable is after the starting value OR if the outer loops are on the next level (in which case all inner loops have to be processed)
Dim District, Inner, Ending As List(Of String)
 
Dim startDistrict As String = "" 'set the district to start processing from, leave empty to do it all
Dim startInner As String = "" 'idem
Dim startEnding As String = "" 'idem
 
        District = DistrictList()
        Inner = InnerList()
        Ending = EndingList()
 
        For Each d1 As String In District
         If d1 >= startDistrict Then
            s1 = d1
            For Each i1 As String In Inner
              if i1 >= startInner OR d1 > startDistrict then
                s2 = s1 & i1
                For Each e1 As String In Ending
                  if e1 >= startEnding or d1 > startDistrict or i1 > startInner then
                    s3 = s2 & " " & e1
 
                    While pauseLoop
                        System.Threading.Thread.Sleep(100)
                        Application.DoEvents()
                    End While
 
                    Application.DoEvents()
                  end if 'if e1 >= startEnding or d1 > startDistrict or i1 > startInner then
                Next 'e1 As String In Ending
              End if ' if i1 >= startInner OR d1 > startDistrict then
            Next 'i1 As String In Inner
          End if ' If d1 >= startDistrict Then
        Next 'd1 As String In District

Open in new window

0
 
LVL 34

Accepted Solution

by:
Sancler earned 400 total points
ID: 21786472
Or use an index rather than for each and store the indices.  Something like this

Private Sub ProcessLists(dStart As Long, iStart As Long, eStart As Long)
  Dim dIndex, iIndex, eIndex, dEnd, iEnd, eEnd As Long
  dEnd = District.Count - 1
  iEnd = Inner.Count - 1
  eEnd = Ending.Count - 1
  For dIndex = dStart to dEnd
      s1 = District(dIndex)
      For iIndex = iStart to iEnd
          s2 = s1 & Inner(iIndex)
          For eIndex = eStart to eEnd
              s3 = s2 & " " & Ending(eIndex)
              'do stuff
              If stopping Then
                 'save dIndex, iIndex, eIndex + 1
                 'may need to check if eIndex = eEnd and, if so
                 'save iIndex + 1 and 0 for eIndex
                 Exit Sub
              End If
          Next
          eStart = 0
      Next
      iStart = 0
  Next
End Sub

At the beginning call the sub with 0,0,0.  On restarting call it with the saved values.

Roger
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21786646
>Sancler
your code has the flaw that when you start with 0,5,0, it will skip the values for the second loop from 0..4 for ALL the value of the first loop... which is no good :)
0
Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

 
LVL 34

Expert Comment

by:Sancler
ID: 21786825
angelIII

What about the third line from the end

     iStart = 0

Before dIndex goes from 0 to 1, iStart is reset to 0.

I must admit I haven't tested it, though.  Do you still reckon there's a flaw?

Roger
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21787557
oooops, I overlooked that! I stand corrected!
0
 
LVL 19

Author Closing Comment

by:Stephen Manderson
ID: 31467182
Thanks
0

Featured Post

Monthly Recap

May was a big month for new releases from Linux Academy! Take a look at what our team built recently in our blog. You can access the newest releases from our blog.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
Whether you’re a college noob or a soon-to-be pro, these tips are sure to help you in your journey to becoming a programming ninja and stand out from the crowd.
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

628 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question