I need to read the entire eventlog and parse it. The application uses vb.net and the EventLog object. The problem i'm having is that it can take less then a second up to 15 seconds to read all entries in the eventlog. I used Perfmon and found the following two counters that were used heavily
..NET CLR Security Total Runtime Check
..NET CLR Interop # of marshallin
I have written some sample code that shows my problem
Module Module
'<System.Securi ty.SuppressUnma nagedCodeSecuri ty()>
Sub Main(
'Dim evl As New EventLog("Syste m"
Dim evl As New EventLog("Appli cation"
Dim str As Strin
Dim startTime, endTime As Dat
str = "No entries: " & evl.Entries.Cou n
Debug.WriteLine (str
Console.WriteLi ne(str
For x As Integer = 0 To
startTime = No
For Each entry As EventLogEntry In evl.Entrie
str = entry.UserName & entry.Source & entry.MachineNa me &
entry.Category & entry.CategoryN umber & entry.EntryType &
entry.EventID & entry.Index & entry.TimeGener ated & entry.Messag
Nex
endTime = No
str = "Started: " & startTime.ToStr ing("HH:mm:ss.f fff") & vbCrLf &
"Ended: " & endTime.ToStrin g("HH:mm:ss.fff f"
Debug.WriteLine (str
Console.WriteLi ne(str
Nex
End Su
End Modul
When i run it on a P4 machine (3GHz and 2G ram) i get the following results
No entries: 170
Started: 12:04:34.875
Ended: 12:04:38.890
No entries: 193
Started: 12:05:37.937
Ended: 12:05:39.859
Since the application i'm writing is a graphical one i don't want any hangings
Any ideas how i can trim the system or change the code to make it run faster
Nov 22 '05
12  2373 
Hi Dominique,
I tested it and the test is bellow.
With short strings I had almost the same results as you.
Although using the SB was the fastest while the concatanation of short
strings in line was almost the same.
What was also slightly different with me was that the creation of the SB
inside the loop the time was twice as much as with setting the length to 0,
(that test with new SB is not included).
However when the strings become longer, what is in the end of the test, I
had to bring the test down to 1000 loops when I did not wanted to wait to
long using something other than the stringbuilder.
Maybe you can have a look at it and when I did test something wrong tell me?
Cor
Module Teststrings
Public Sub main()
Dim arl As New ArrayList
arl.Add("This is string one")
arl.Add("This is string two")
arl.Add("This is string three")
arl.Add("This is string four")
arl.Add("This is string five")
arl.Add("This is string six")
arl.Add("This is string seven")
arl.Add("This is string eight")
arl.Add("This is string nine")
arl.Add("This is string ten")
Dim str As String
Dim start As Integer = Environment.Tic kCount
Dim sb As New System.Text.Str ingBuilder("")
For i As Integer = 0 To 100000
sb.Length = 0
sb.Append(arl(0 ).ToString)
sb.Append(arl(1 ).ToString)
sb.Append(arl(2 ).ToString)
sb.Append(arl(3 ).ToString)
sb.Append(arl(4 ).ToString)
sb.Append(arl(5 ).ToString)
sb.Append(arl(6 ).ToString)
sb.Append(arl(7 ).ToString)
sb.Append(arl(8 ).ToString)
sb.Append(arl(9 ).ToString)
Next
str = sb.ToString
MessageBox.Show ("Short strings with stringbuilder: " & _
(Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = arl(0).ToString & arl(1).ToString & arl(3).ToString _
& arl(4).ToString & arl(5).ToString & _
arl(6).ToString & arl(7).ToString & arl(8).ToString &
arl(9).ToString
Next
MessageBox.Show ("Short strings with concat in row: " & _
(Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = arl(0).ToString
str &= arl(1).ToString
str &= arl(2).ToString
str &= arl(3).ToString
str &= arl(4).ToString
str &= arl(5).ToString
str &= arl(6).ToString
str &= arl(7).ToString
str &= arl(8).ToString
str &= arl(9).ToString
Next
MessageBox.Show ("Short strings with concat row by row: " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = str.Format("{0} ,{1},{2},{3},{4 },{5},{6},{7},{ 8},{9}",
arl(0).ToString , _
arl(1).ToString , arl(2).ToString , arl(3).ToString ,
arl(4).ToString , arl(5).ToString , _
arl(6).ToString , arl(7).ToString , arl(8).ToString ,
arl(9).ToString )
Next
MessageBox.Show ("Short strings with format :" & _
(Environment.Ti ckCount - start).ToString )
'Concetanation
start = Environment.Tic kCount
sb.Length = 0
For i As Integer = 0 To 1000
sb.Append(arl(0 ).ToString)
sb.Append(arl(1 ).ToString)
sb.Append(arl(2 ).ToString)
sb.Append(arl(3 ).ToString)
sb.Append(arl(4 ).ToString)
sb.Append(arl(5 ).ToString)
sb.Append(arl(6 ).ToString)
sb.Append(arl(7 ).ToString)
sb.Append(arl(8 ).ToString)
sb.Append(arl(9 ).ToString)
Next
str = sb.ToString
MessageBox.Show ("Building a long string with sb : " & _
(Environment.Ti ckCount - start).ToString )
str = ""
start = Environment.Tic kCount
For i As Integer = 0 To 1000
str &= arl(0).ToString & arl(1).ToString & _
arl(3).ToString & arl(4).ToString & arl(5).ToString & _
arl(6).ToString & arl(7).ToString & arl(8).ToString &
arl(9).ToString
Next
MessageBox.Show ("Building a long string with concat in a row : " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
str = ""
For i As Integer = 0 To 1000
str &= arl(0).ToString
str &= arl(1).ToString
str &= arl(2).ToString
str &= arl(3).ToString
str &= arl(4).ToString
str &= arl(5).ToString
str &= arl(6).ToString
str &= arl(7).ToString
str &= arl(8).ToString
str &= arl(9).ToString
Next
MessageBox.Show ("Building a long string with concat : " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
str = ""
For i As Integer = 0 To 1000
str &= str.Format("{0} ,{1},{2},{3},{4 },{5},{6},{7},{ 8},{9}", _
arl(0).ToString , arl(1).ToString , arl(2).ToString , _
arl(3).ToString , arl(4).ToString , arl(5).ToString , _
arl(6).ToString , arl(7).ToString , arl(8).ToString ,
arl(9).ToString )
Next
MessageBox.Show ("Building a long string with format : " _
& (Environment.Ti ckCount - start).ToString )
End Sub
End Module
Hi Dominique,
I tested it and the test is bellow.
With short strings I had almost the same results as you.
Although using the SB was the fastest while the concatanation of short
strings in line was almost the same.
What was also slightly different with me was that the creation of the SB
inside the loop the time was twice as much as with setting the length to 0,
(that test with new SB is not included).
However when the strings become longer, what is in the end of the test, I
had to bring the test down to 1000 loops when I did not wanted to wait to
long using something other than the stringbuilder.
Maybe you can have a look at it and when I did test something wrong tell me?
Cor
Module Teststrings
Public Sub main()
Dim arl As New ArrayList
arl.Add("This is string one")
arl.Add("This is string two")
arl.Add("This is string three")
arl.Add("This is string four")
arl.Add("This is string five")
arl.Add("This is string six")
arl.Add("This is string seven")
arl.Add("This is string eight")
arl.Add("This is string nine")
arl.Add("This is string ten")
Dim str As String
Dim start As Integer = Environment.Tic kCount
Dim sb As New System.Text.Str ingBuilder("")
For i As Integer = 0 To 100000
sb.Length = 0
sb.Append(arl(0 ).ToString)
sb.Append(arl(1 ).ToString)
sb.Append(arl(2 ).ToString)
sb.Append(arl(3 ).ToString)
sb.Append(arl(4 ).ToString)
sb.Append(arl(5 ).ToString)
sb.Append(arl(6 ).ToString)
sb.Append(arl(7 ).ToString)
sb.Append(arl(8 ).ToString)
sb.Append(arl(9 ).ToString)
Next
str = sb.ToString
MessageBox.Show ("Short strings with stringbuilder: " & _
(Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = arl(0).ToString & arl(1).ToString & arl(3).ToString _
& arl(4).ToString & arl(5).ToString & _
arl(6).ToString & arl(7).ToString & arl(8).ToString &
arl(9).ToString
Next
MessageBox.Show ("Short strings with concat in row: " & _
(Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = arl(0).ToString
str &= arl(1).ToString
str &= arl(2).ToString
str &= arl(3).ToString
str &= arl(4).ToString
str &= arl(5).ToString
str &= arl(6).ToString
str &= arl(7).ToString
str &= arl(8).ToString
str &= arl(9).ToString
Next
MessageBox.Show ("Short strings with concat row by row: " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = str.Format("{0} ,{1},{2},{3},{4 },{5},{6},{7},{ 8},{9}",
arl(0).ToString , _
arl(1).ToString , arl(2).ToString , arl(3).ToString ,
arl(4).ToString , arl(5).ToString , _
arl(6).ToString , arl(7).ToString , arl(8).ToString ,
arl(9).ToString )
Next
MessageBox.Show ("Short strings with format :" & _
(Environment.Ti ckCount - start).ToString )
'Concetanation
start = Environment.Tic kCount
sb.Length = 0
For i As Integer = 0 To 1000
sb.Append(arl(0 ).ToString)
sb.Append(arl(1 ).ToString)
sb.Append(arl(2 ).ToString)
sb.Append(arl(3 ).ToString)
sb.Append(arl(4 ).ToString)
sb.Append(arl(5 ).ToString)
sb.Append(arl(6 ).ToString)
sb.Append(arl(7 ).ToString)
sb.Append(arl(8 ).ToString)
sb.Append(arl(9 ).ToString)
Next
str = sb.ToString
MessageBox.Show ("Building a long string with sb : " & _
(Environment.Ti ckCount - start).ToString )
str = ""
start = Environment.Tic kCount
For i As Integer = 0 To 1000
str &= arl(0).ToString & arl(1).ToString & _
arl(3).ToString & arl(4).ToString & arl(5).ToString & _
arl(6).ToString & arl(7).ToString & arl(8).ToString &
arl(9).ToString
Next
MessageBox.Show ("Building a long string with concat in a row : " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
str = ""
For i As Integer = 0 To 1000
str &= arl(0).ToString
str &= arl(1).ToString
str &= arl(2).ToString
str &= arl(3).ToString
str &= arl(4).ToString
str &= arl(5).ToString
str &= arl(6).ToString
str &= arl(7).ToString
str &= arl(8).ToString
str &= arl(9).ToString
Next
MessageBox.Show ("Building a long string with concat : " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
str = ""
For i As Integer = 0 To 1000
str &= str.Format("{0} ,{1},{2},{3},{4 },{5},{6},{7},{ 8},{9}", _
arl(0).ToString , arl(1).ToString , arl(2).ToString , _
arl(3).ToString , arl(4).ToString , arl(5).ToString , _
arl(6).ToString , arl(7).ToString , arl(8).ToString ,
arl(9).ToString )
Next
MessageBox.Show ("Building a long string with format : " _
& (Environment.Ti ckCount - start).ToString )
End Sub
End Module
Hi Dominique,
I tested it and the test is bellow.
With short strings I had almost the same results as you.
Although using the SB was the fastest while the concatanation of short
strings in line was almost the same.
What was also slightly different with me was that the creation of the SB
inside the loop the time was twice as much as with setting the length to 0,
(that test with new SB is not included).
However when the strings become longer, what is in the end of the test, I
had to bring the test down to 1000 loops when I did not wanted to wait to
long using something other than the stringbuilder.
Maybe you can have a look at it and when I did test something wrong tell me?
Cor
Module Teststrings
Public Sub main()
Dim arl As New ArrayList
arl.Add("This is string one")
arl.Add("This is string two")
arl.Add("This is string three")
arl.Add("This is string four")
arl.Add("This is string five")
arl.Add("This is string six")
arl.Add("This is string seven")
arl.Add("This is string eight")
arl.Add("This is string nine")
arl.Add("This is string ten")
Dim str As String
Dim start As Integer = Environment.Tic kCount
Dim sb As New System.Text.Str ingBuilder("")
For i As Integer = 0 To 100000
sb.Length = 0
sb.Append(arl(0 ).ToString)
sb.Append(arl(1 ).ToString)
sb.Append(arl(2 ).ToString)
sb.Append(arl(3 ).ToString)
sb.Append(arl(4 ).ToString)
sb.Append(arl(5 ).ToString)
sb.Append(arl(6 ).ToString)
sb.Append(arl(7 ).ToString)
sb.Append(arl(8 ).ToString)
sb.Append(arl(9 ).ToString)
Next
str = sb.ToString
MessageBox.Show ("Short strings with stringbuilder: " & _
(Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = arl(0).ToString & arl(1).ToString & arl(3).ToString _
& arl(4).ToString & arl(5).ToString & _
arl(6).ToString & arl(7).ToString & arl(8).ToString &
arl(9).ToString
Next
MessageBox.Show ("Short strings with concat in row: " & _
(Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = arl(0).ToString
str &= arl(1).ToString
str &= arl(2).ToString
str &= arl(3).ToString
str &= arl(4).ToString
str &= arl(5).ToString
str &= arl(6).ToString
str &= arl(7).ToString
str &= arl(8).ToString
str &= arl(9).ToString
Next
MessageBox.Show ("Short strings with concat row by row: " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
For i As Integer = 0 To 100000
str = str.Format("{0} ,{1},{2},{3},{4 },{5},{6},{7},{ 8},{9}",
arl(0).ToString , _
arl(1).ToString , arl(2).ToString , arl(3).ToString ,
arl(4).ToString , arl(5).ToString , _
arl(6).ToString , arl(7).ToString , arl(8).ToString ,
arl(9).ToString )
Next
MessageBox.Show ("Short strings with format :" & _
(Environment.Ti ckCount - start).ToString )
'Concetanation
start = Environment.Tic kCount
sb.Length = 0
For i As Integer = 0 To 1000
sb.Append(arl(0 ).ToString)
sb.Append(arl(1 ).ToString)
sb.Append(arl(2 ).ToString)
sb.Append(arl(3 ).ToString)
sb.Append(arl(4 ).ToString)
sb.Append(arl(5 ).ToString)
sb.Append(arl(6 ).ToString)
sb.Append(arl(7 ).ToString)
sb.Append(arl(8 ).ToString)
sb.Append(arl(9 ).ToString)
Next
str = sb.ToString
MessageBox.Show ("Building a long string with sb : " & _
(Environment.Ti ckCount - start).ToString )
str = ""
start = Environment.Tic kCount
For i As Integer = 0 To 1000
str &= arl(0).ToString & arl(1).ToString & _
arl(3).ToString & arl(4).ToString & arl(5).ToString & _
arl(6).ToString & arl(7).ToString & arl(8).ToString &
arl(9).ToString
Next
MessageBox.Show ("Building a long string with concat in a row : " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
str = ""
For i As Integer = 0 To 1000
str &= arl(0).ToString
str &= arl(1).ToString
str &= arl(2).ToString
str &= arl(3).ToString
str &= arl(4).ToString
str &= arl(5).ToString
str &= arl(6).ToString
str &= arl(7).ToString
str &= arl(8).ToString
str &= arl(9).ToString
Next
MessageBox.Show ("Building a long string with concat : " _
& (Environment.Ti ckCount - start).ToString )
start = Environment.Tic kCount
str = ""
For i As Integer = 0 To 1000
str &= str.Format("{0} ,{1},{2},{3},{4 },{5},{6},{7},{ 8},{9}", _
arl(0).ToString , arl(1).ToString , arl(2).ToString , _
arl(3).ToString , arl(4).ToString , arl(5).ToString , _
arl(6).ToString , arl(7).ToString , arl(8).ToString ,
arl(9).ToString )
Next
MessageBox.Show ("Building a long string with format : " _
& (Environment.Ti ckCount - start).ToString )
End Sub
End Module
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