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Why PermGen is not populated faster?


Why PermGen is not populated faster?

By : user2948491
Date : November 14 2020, 04:51 PM
To fix the issue you can do Why would having a method with a long name significantly increase the amount of space used by a class? The class loader will intern the method name, notice that the string already exists in memory and use that string rather than a new string.
If you want to increase the amount of space a class takes up then declare lots of static fields.
code :


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Why sorting a randomly populated array gets progressively faster

Why sorting a randomly populated array gets progressively faster


By : Jane Somerly
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Likely your JVM is running in interpreted mode for the first couple iterations, then it notices that you are running the same method repeatedly and compiles it to native code. If you call the same method an even greater number of times, it may even cause further optimizations to "kick in".
Because the JVM works this way, you should always warm your JVM up before taking performance measurements. Basically, run the code you want to benchmark in a loop a bunch of times, then do the measurements. (Note: this should happen within the space of a single JVM process run -- if the JVM exits and starts up again, you're back to square one.)
Android Pre Populated Database - Adding New Pre Populated Rows After Publication

Android Pre Populated Database - Adding New Pre Populated Rows After Publication


By : Ali Ali Khan
Date : March 29 2020, 07:55 AM
this will help You could add some sql patch files, and then read them to upgrade your database.
I used it simply with the FileHelper static class I copied from Danny Remington's post on SO and then do :
code :
try {
    InputStream in = mgr.open(assetFile);
    String[] statements = FileHelper.parseSqlFile(in);
    dao.mDb.execSQL("BEGIN TRANSACTION;");
    /*dao.mDb is a reference to the SQLiteDatabase from my dao*/
    for (String statement : statements) {
        dao.mDb.execSQL(statement);
    }
    dao.mDb.execSQL("COMMIT;");
    in.close();
} catch (IOException e) {
    //
}
Copy values from populated cells only to a different sheet, without extra rows after the last populated value

Copy values from populated cells only to a different sheet, without extra rows after the last populated value


By : Shawon
Date : November 18 2020, 03:01 PM
To fix the issue you can do First, with a little searching and some Google-Fu. I have pieced together a working Excel spreadsheet with some VBA. I am by no means a coder, nor is it my profession, however, it is something I have a basic understanding of. That said, I have been banging my head against a wall. , EDIT AND FIXED
code :
Sub test()

    Dim LastRow As Long

    For y = LastColumnInOneRow To 1 Step -1
        LastRow = Sheets("Sheet3").cells(Sheets("Sheet3").Rows.Count, y).End(xlUp).row
        For x = LastRow To 1 Step -1
            Sheets("Sheet4").cells(x, y).value = Sheets("Sheet3").cells(x, y).value
        Next x
    Next y

End Sub

Private Function LastColumnInOneRow() As Long

    With Sheets("Sheet4")
        LastColumnInOneRow = .cells(1, .Columns.Count).End(xlToLeft).column
    End With

End Function
Using Python Count Number Of Populated Cells Populated In First Column

Using Python Count Number Of Populated Cells Populated In First Column


By : user1238046
Date : March 29 2020, 07:55 AM
hope this fix your issue I am new to python and trying to learn - I have a spreadsheet that I need to open and count the populated cells (in first column) and print the count. Here is my code - I keep getting a traceback. Can you please assist? , You can use col_slice function for this.
code :
import xlrd

book = xlrd.open_workbook('C:\\Users\\am\\Book1.xlsx')
sheet = book.sheet_by_name('Sheet1')

cells = sheet.col_slice(start_rowx=0,
                        end_rowx=sheet.nrows,
                        colx=0)
count = len(cells)
Permgen and Garbage collection Java, Busting permgen myths

Permgen and Garbage collection Java, Busting permgen myths


By : Mark Lewis
Date : March 29 2020, 07:55 AM
seems to work fine actually it's not true that Permgen does never get garbage collected. It contains the classes that where loaded by the application, and gets collected when classloaders get garbage collected, typically in redeployment scenarios.
You can use these JVM flags to see when classes are loaded into and unloaded from the permgen:
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