MapServer 4.10.1 Memory Leak still exists
David Martin
David at ITBEYOND.COM.AU
Thu Apr 19 01:07:41 PDT 2007
Umberto,
The data type is shape. The number of active layers depends on zoom
level however in the map file there is a total of 39 layer definitions,
with between 10 and 30 active at any one time. The queries are run only
in one layer.
I have done some more work on the system and improved the operation by
caching commonly used images. You can have a look at the application
live if you wish - it is an infant however running live (I note it is
crashed at the moment so must recycle app pool - which is in the process
of being done). To see it running visit
http://www.exploroz.com/Places/Find/CaravanPark.asp?ms=1 - The initial
map is cached so use mouse and draw a box to run a query - you will
either see the crash message or a refined result set.
The application is running on a Win 2003 server so no access to Linux
tools. I have been using the same .map file with the CGI interface for a
few years and never had problem at all.
I note that I can run the cgi mapserver process after the system has
reported the .net memory allocation error. A sample of the CGI interface
using the same .map file is as follows
http://www.exploroz.com/cgi-bin/MapServer/MapServ.exe?mode=browse&map=e:
\\inetpub\\vs126169\\iMapPlot\\map\\ExplorOzBase.map&map_PointRef_featur
e=new&map_PointRef_feature_points=153.5136%20-27.4211&map_PointRef_featu
re_text=Adder%20Rock&mapext=152.7636%20-28.1711%20154.2636%20-26.6711&th
emode=zoomin&MapLabel=Show%20Me%20-%20Adder%20Rock%20-27.4211%20153.5136
Any help would be appreciated.
Regards
David Martin
Managing Director
I.T. Beyond Pty Ltd
Postal: PO BOX 967
HILLARYS WA 6923
Ph: (08) 9403 3737
Mobile: 0417 677 275
Fax: (08) 9403 3738
Skype: itbeyond_david
________________________________
Check out our websites: www.ExplorOz.com and www.itbeyond.com.au
________________________________
-----Original Message-----
From: Umberto Nicoletti [mailto:umberto.nicoletti at gmail.com]
Sent: Thursday, 19 April 2007 2:58 PM
To: David Martin
Cc: MAPSERVER-USERS at lists.umn.edu
Subject: Re: [UMN_MAPSERVER-USERS] MapServer 4.10.1 Memory Leak still
exists
Martin,
how many layers do you have on your map and which kind are they (shape,
oracle, spatial, postigs, etc)?
If, by chance, you had a linux mapserver installation it would help if
you could run valgrind (a memory leak detector for Linux) on the map
file with the following command:
valgrind --show-reachable=yes --leak-check=full ./shp2img -m
YOURMAPHERE.map -o ~/Desktop/test.png
and post the output.
Umberto
On 4/19/07, David Martin <david at itbeyond.com.au> wrote:
> I have been testing MS 4.10.0 and 4.10.1 and have found that the
> Memory Leak issue identifed in 4.10.0 still exists in 4.10.1 when
> running the C# mapserver dlls and Mapscript.
>
> Now I am using vb.net for the code development. I have released the
> code live today and found it ran for 30mins before it consumed over
> 1Gb of system memory. The code I am using is as follows:
>
> There are two subs that inerface to MS one to display images and the
> other to process form data and run a query:
>
> Private Sub DisplayImage(ByVal RefineImage As Boolean)
> Dim imageLoc, RefimageLoc As String
> If RefineImage Then
> ' This is a refined query - show number of results to the
> screen and also the refined map
> imageLoc = "/Uploads/iMapPlot/tmp/" &
> Math.Abs(Now.ToBinary) & ".gif"
> RefimageLoc = "/Uploads/iMapPlot/tmp/Ref" & Math.Abs
> (Now.ToBinary) & ".gif"
> MSMap = New mapObj(MapFile())
> MSMap.setExtent(CurrentExtent.minx, CurrentExtent.miny,
> CurrentExtent.maxx, CurrentExtent.maxy)
> Dim Refineimg As imageObj
> Dim Referenceimg As imageObj
> If MapLayers <> "" Then
> Dim layerElements As String() = Split(MapLayers, ",")
> Dim layer As String
> Dim lyr As layerObj
> For Each layer In layerElements
> lyr = MSMap.getLayerByName(layer)
> lyr.status = STATUS_VALUES.MS_ON
> If layer = "Places" Then
> lyr.data = "..\ExplorOz\Places\" &
PlacesPOIName
> Dim sty As styleObj =
lyr.getClass(0).getStyle(0)
> sty.setSymbolByName (MSMap,
> "../../Images/PointPlace/symbols/" & PlacesPOIImage & ".gif")
> End If
> Next
> End If
> Refineimg = MSMap.draw
> Refineimg.save(Server.MapPath(imageLoc), Nothing)
> Refineimg.Dispose()
> Referenceimg = MSMap.drawReferenceMap
> Referenceimg.save(Server.MapPath(RefimageLoc), Nothing)
> Referenceimg.Dispose()
> CurrentExtent.maxx = MSMap.extent.maxx
> CurrentExtent.minx = MSMap.extent.minx
> CurrentExtent.maxy = MSMap.extent.maxy
> CurrentExtent.miny = MSMap.extent.miny
> MSMap.Dispose()
> MainMap.Src = imageLoc
> refimg.Src = RefimageLoc
> Else
> imageLoc = "/Uploads/iMapPlot/Cache/" &
> Replace(Mid(MapFile, InStrRev(MapFile, "\") + 1), ".map", "_" &
> Replace(MapLayers, ",", "") & PlacesPOIName & ".gif")
> RefimageLoc = "/Uploads/iMapPlot/Cache/Ref" &
> Replace(Mid(MapFile, InStrRev(MapFile, "\") + 1), ".map", "_" &
> Replace(MapLayers, ",", "") & PlacesPOIName & ".gif")
> If Not System.IO.File.Exists(Server.MapPath(imageLoc)) Or
> Not
> System.IO.File.Exists(Server.MapPath(RefimageLoc)) Then
> Dim img As imageObj
> Dim Referenceimg As imageObj
> MSMap = New mapObj(MapFile())
> If MapLayers <> "" Then
> Dim layerElements As String() = Split(MapLayers,
",")
> Dim layer As String
> Dim lyr As layerObj
> For Each layer In layerElements
> lyr = MSMap.getLayerByName(layer)
> lyr.status = STATUS_VALUES.MS_ON
> If layer = "Places" Then
> lyr.data = "..\ExplorOz\Places\" &
PlacesPOIName
> Dim sty As styleObj =
lyr.getClass(0).getStyle(0)
> sty.setSymbolByName (MSMap,
> "../../Images/PointPlace/symbols/" & PlacesPOIImage & ".gif")
> End If
> Next
> End If
> img = MSMap.draw
> img.save(Server.MapPath(imageLoc), Nothing)
> img.Dispose()
> Referenceimg = MSMap.drawReferenceMap
> Referenceimg.save(Server.MapPath(RefimageLoc),
Nothing)
> Referenceimg.Dispose()
> MSMap.Dispose()
> End If
> MainMap.Src = imageLoc
> refimg.Src = RefimageLoc
> End If
> map.Value = MapFile()
> layer.Value = MapLayers
> End Sub
>
> Private Sub Query()
> Dim result As Integer
> Dim lyr As layerObj
> MSMap = New mapObj(MapFile())
> lyr = MSMap.getLayerByName(SearchLayer)
> MSMap.setExtent(CurrentExtent.minx, CurrentExtent.miny,
> CurrentExtent.maxx, CurrentExtent.maxy)
> If SearchLayer = "Places" Then lyr.data =
> "..\ExplorOz\Places\" & PlacesPOIName
> Dim s As New System.Text.StringBuilder
>
> result = lyr.queryByRect(MSMap, CurrentExtent)
>
> If result = RESULT_CODE.MS_SUCCESS Then
> Dim resCache As resultCacheObj = lyr.getResults
>
> If resCache.numresults > 0 Then
> Dim shp As shapeObj
> Dim fName As String
> lyr.open()
> NumResults = resCache.numresults
> For i As Integer = 0 To resCache.numresults - 1
> shp =
> lyr.getFeature(resCache.getResult(i).shapeindex,
> resCache.getResult(i).tileindex)
> For iItem As Integer = 0 To lyr.numitems - 1
> fName = lyr.getItem(iItem)
> If fName = "ID" Then
s.Append(shp.getValue(iItem) & ",")
> Next
> shp.Dispose()
> Next
> If s.Length > 1 Then s.Remove(s.Length - 1, 1)
> lyr.close()
> End If
>
> 'If SearchLayer = "Places" Then
> ' Response.Write(NumResults)
> ' Response.Write("<br />" & s.ToString)
> ' Exit Sub
> 'End If
> lyr.Dispose()
> MSMap.Dispose()
> End Sub
>
> You will see that I dispose every element I create, this has been
> tried on two servers (and the production system - dual cpu, 2GB ram) -
> I do stress the application with hundreds of users per hour. The
> exception thrown is as
> follows:
> Server Error in '/' Application.
> ----------------------------------------------------------------------
> -----
> -----
>
> msLoadMap(): Memory allocation error.
> Description: An unhandled exception occurred during the execution of
> the current web request. Please review the stack trace for more
> information about the error and where it originated in the code.
>
> Exception Details: System.ApplicationException: msLoadMap(): Memory
> allocation error.
>
> [ApplicationException: msLoadMap(): Memory allocation error. ]
> mapObj..ctor(String filename) +54
> MapSearch.Query() +52
> MapSearch.Page_Load(Object sender, EventArgs e) +284
> System.Web.UI.Control.OnLoad(EventArgs e) +99
> System.Web.UI.Control.LoadRecursive() +47
> System.Web.UI.Page.ProcessRequestMain(Boolean
> includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
> +1061
>
>
> Any thoughts or help on this would be great, I have invested a heap of
> time on this interface and do not want to go back to calling the cgi
> system as it is slower - I am using the pre-compiled binaries in the
> MS4W package as downloaded two days ago.
>
> David Martin
>
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