Retreiving number of bytes allocated in RAM

Hello everyone,
I am a newcomer to the Java world so forgive me if my question is trivial...
I am looking for a function call that will provide me with the total amount of bytes that have been allocated in RAM. I need all RAM allocation, not just that consumed by the JVM. Is it possible to retrieve this information in a system-independent manner using the java api?... or must I resort to other means?

Java does not do this for you.
However you should be able to design you program so that you don't need to know this.
How many program you know tell you extactly how much memory they are using?

Similar Messages

  • How much is the maximum number of byte that a string control can hold?

    And also if the the number of byte sent to a string control is beyond that limit, will the string control discard that data?

    From App Note 154:
    "LabVIEW stores strings as a pointer to a structure containing a 4-byte length value followed by a 1D arrays of byte integers (8-bit characters)."
    The 4-byte value is the same size as a U32, which has a range of 0 to 4,294,967,295. So, your string can have up to 4,294,967,295 characters. If you have the memory
    What does a control do if you exceed that? I don't know. I don't have enough RAM to try it and see.

  • How to get the number of bytes stored in a field?

    Hi Guys,
    How can i get the number of bytes stored in a field.
    I tried using DESCRIBE FIELD, But here i am getting the length from the definition.
    i.e 8 bytes for string and for character value is from definition.
    Prompt replies will be Awarded with full points:-)
    Thanks,
    vinod.

    u see this : http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f2e5446011d189700000e8322d00/frameset.htm
    http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f2e5446011d189700000e8322d00/frameset.htm
    Madhavi

  • How to get the number of bytes at TCP port

    Hi all,
    How to get the number of bytes to read at the TCp port...as someone had suggested in some forum we do read the number of bytes first and then pass this...
    but we get a problem when we have FF data in this...because then it sends 2 FF data...and cause of this we skip the last data...is there any solution for the same?

    Hi
    In LabVIEW you don't have the same property as in serail port.
    You havn't "Byte at TCPIP port".
    if you developp a protocol, one soltion, is to send the size to read.
    Ingénieur d'Application / Développeur LabVIEW Certifié (CLD)
    Application Engineer / LabVIEW Certified Developer (CLD)

  • Output says "The number of bytes in the file are 0" but the file has bytes

    Dear Java People,
    Why would an output say a file has 0 bytes when upon doing a search for the file in Windows Explorer it say the file has 1 -4 kbytes ?
    for example part of my output was :
    "the number of bytes in TryFile3.java are 0"
    caused by the following lines of code:
    System.out.println("\n" + contents[i] + " is a " +
    (contents.isDirectory() ? "directory" : "file\n") +
    " last modified on " + new Date(contents[i].lastModified())
    + "\nthe number of bytes in TryFile.java are " + myFile.length());
    thank you in advance
    below are the two program classes
    Norman
    import java.io.File;
    import java.io.FilenameFilter;
    import java.util.Date;
    public class TryFile3
       public static void main(String[] args)
           //create an object that is a directory
             File myDir =
            new File("C:\\Documents and Settings\\Gateway User\\jbproject\\stan_ch9p369");
              File myFile = new File(myDir, "TryFile3.java");
            System.out.println("\n" + myDir + (myDir.isDirectory() ? " is" : " is not")
            + " a directory.");
             System.out.println( myDir.getAbsolutePath() +
             (myDir.isDirectory() ? " is" : " is not") + " a directory.");
              System.out.println("The parent of " + myDir.getName() + " is " +
              myDir.getParent());
               //Define a filter for java source files Beginning with the letter 'F'
               FilenameFilter select = new FileListFilter("F", "java");
               //get the contents of the directory
               File[] contents = myDir.listFiles(select);
                //list the contents of the directory
             if(contents != null)
                 System.out.println("\nThe " + contents.length  +
                 " matching item(s) in the directory " + myDir.getName() + " are:\n " );
                 for(int i = 0; i < contents.length; i++)
                   System.out.println("\n" +  contents[i] + " is a " +
                   (contents.isDirectory() ? "directory" : "file\n") +
    " last modified on " + new Date(contents[i].lastModified())
    + "\nthe number of bytes in TryFile3.java are " + myFile.length());
    else {
    System.out.println(myDir.getName() + " is not a directory");
    System.exit(0);
    import java.io.File;
    import java.io.FilenameFilter;
    import java.util.Date;
    public class FileListFilter implements FilenameFilter
    private String name; // file name filter
    private String extension; // File extension filter
    public FileListFilter(String name, String extension)
    this.name = name;
    this.extension = extension;
    // static boolean firstTime = true;
    public boolean accept(File diretory, String filename)
    //the following line of code can be inserted in order to find out who called the method
    // if(firstTime)
    // new Throwable("starting the accept() method").printStackTrace();
    boolean fileOK = true;
    //if there is a name filter specified, check the file name
    if(name != null)
    fileOK &= filename.startsWith(name);
    //if there is an extension filter, check the file extension
    if(extension != null)
    fileOK &= filename.endsWith('.' + extension);
    return fileOK;

    System.out.println("\n" + contents + " is a " +
    (contents.isDirectory() ? "directory" : "file\n") +
    " last modified on " + new Date(contents.lastModified())
    + "\nthe number of bytes in TryFile.java are " + myFile.length());I haven't read any of your italicized code, but perhaps there is a good reason why you have "myFile.length()" and not "contents.length()" in this line of code?

  • How to reduce the number of bytes for a picture

    I want to reduce the number of bytes used for a picture to be sent to a site like Ebay or craigslist. I son't see any options in Iphoto for this purpose.

    You can do it in Preview.
    Open the image in Preview. Under Tools, click Adjust Size.
    Scale it down to the smallest acceptable size (the website should give a suggested resolution).
    Then go to File -> Export, save it as a Jpeg.
    Smaller size image means smaller file size.

  • How can I monitor number of bytes downloaded so I don't go over my plan limit?

    I have a limited number of bytes I can download per day. How can I monitor this on a daily usuage?

    I think that is exactly what i need. I have downloaded and restarted firefox. I entered the user name and password I use to sign on to the internet and get a red x next to the icon and it is not working. any suggestions?

  • Hello , FMS is how to prevent the client into a large number of bytes?

    Hello , FMS how to prevent the client to pass a large number of bytes , such as one person put a 1G file in the argument , I also silly to receive ?Although there Client.setBandwidthLimit ( ) limit his maximum traffic per second , but is there a way , one more than the maximum amount of bytes to disconnect his.I assume that methods to determine the length is also obtained all of his transfer is finished , in order to determine out of it .

    How to limit the size of the parameters of the method.I wrote a method in the main.asc then the client NetConnection.call assignment, but if the client is malicious to upload very large data, how to limit it, I view the document did not find the clues, I hope that those parameters up to100KB.

  • Comparison of number of bytes transferred over network while using HTTPService and RemoteObjects

    If I have to transfer data(say records of 100 employees in a DB) from Server to Client, I could use HTTPService and fetch the data as an XML file and then convert it to ArrayCollection in the Client. Or use RemoteObject and transfer the data in binary. Lets ignore other methods(Web Services etc) of data transfer for the moment.
    Now, for the same data, if I implement the application using HTTPService and RemoteObject, I notice that the number of bytes transferred over the network is less in case of HTTPService(XML) when compared to RemoteObject(AMF) which is a shock to me. My understanding is that AMF transfer should be more compact than XML. Ofcourse, once the data is available, RemoteObject result processing is noticeably faster than HTTPService result processing. My concern is why data transferred using AMF is larger than XML. As an example, you may refer to the samples provided in TourDeFlex. Refer to the following:
    HTTPService:
        Found in : Flex Data Access->HTTPService->BasicExample
        Link: http://www.adobe.com/devnet-archive/flex/tourdeflex/web/#docIndex=0;illustIndex=0;sampleId =12700
        Click on the 'Get Data' button to fetch the data.
        Bytes transferred - 1050
    RemoteObject:
        Found in : Flex Data Access->RemoteObject->BasicJavaRemoting
        Link: http://www.adobe.com/devnet-archive/flex/tourdeflex/web/#docIndex=0;illustIndex=0;sampleId =13300
        Click on the 'Get Data' button to fetch the data.
        Bytes transferred - 1440
    This is a significant size difference. You may see the data transfer size by using developer tools like the HTTPFox Firefox extension.
    Am I missing something here? Any help will be very much appreciated.
    Thanks,
    Balu

    There is definitely problem with your tool or you looked at something else. Please check the attached snapshots of the session using charles capture tool. The response sizes are way bigger than what you mentioned but remoteobjects is almost half of httpservice for the complete transfer including request and response. Check below -
    httpservice -
    http://tinypic.com/view.php?pic=2q2le2e&s=7
    amf -
    http://tinypic.com/r/10wmx4o/7

  • Easily read strings while tracking the number of bytes read?

    Hi all,
    I'm after a way to easily parse and read strings from a file, while also being able to check (at any point) how many bytes have currently been read from that file.
    I currently use the following for the string processing:
    BufferedReader in = new BufferedReader(new FileReader(filename));
    String str = null;
    while ((str = in.readLine()) != null)
      // process the string
    }That's all fine, but the files I'm reading can be very large (multi GB) so obviously it can take a while to read them. During this time I pop up a progress bar, and attempt to track the progress of the read. The files I'm working with just now come with a header on the first line that states how many "somethings" (that I happen to be looking for) will appear in the file. I can use that number to set the maximum value for the progress bar, and update its current value as I find them.
    However... I'm also about to start working with files that don't contain this information. I've thought of two ways of knowing how much work has to be done in advance of the read so the maximum value for the progress bar can be set:
    1) Quickly count the number of lines in the file without doing any processing. This works, but can still take some time for large files, even with more efficient reading algorithms.
    2) Use File.length() to set the maximum to be the number of bytes that will read.
    I'd like to use 2), but can't work out a way to use simple String based file parsing (as in the code above), but also be able to know how many bytes have been read so far. Using this code means I don't have to worry about end of line terminators, charset encoding, etc - the Reader does it for me.
    Any suggestions?
    Thanks

    import javax.swing.*;
    Component parent; // might be null, or your JFrame
    String message; // message to display in the progress bar
    BufferedReader br = new BufferedReader(new InputStreamReader(new ProgressMonitorInputStream(parent, message, new FileInputStream(file)), charset));

  • How do you calculate the number of bytes in a hexidecimal array?

    Hi can anybody help me calculate the number of bytes in a hexidecimal array ie:
    04h + 12h + 4Eh + 20h = 84h
    Thanks

    Hi,
    I'm not sure if you want to count the bytes or sum the array. But here's an example of both:
    Hope this helps,
    Paulo
    Attachments:
    ByteCount.vi ‏18 KB

  • How to calculate number of bytes

    Is there a general algorithm that calculates the total number of bytes in a pl/sql record?

    Perhaps a better example to show how storage is different from what you think, certainly in terms of numbers:
    Wrote file afiedt.buf
      1  with t as (select rownum*11 as rn from dual connect by rownum <= 100)
      2  select rn, length(rn) as ln, dump(rn) dmp
      3* from t
    SQL> /
            RN         LN DMP
            11          2 Typ=2 Len=2: 193,12
            22          2 Typ=2 Len=2: 193,23
            33          2 Typ=2 Len=2: 193,34
            44          2 Typ=2 Len=2: 193,45
            55          2 Typ=2 Len=2: 193,56
            66          2 Typ=2 Len=2: 193,67
            77          2 Typ=2 Len=2: 193,78
            88          2 Typ=2 Len=2: 193,89
            99          2 Typ=2 Len=2: 193,100
           110          3 Typ=2 Len=3: 194,2,11
           121          3 Typ=2 Len=3: 194,2,22
           132          3 Typ=2 Len=3: 194,2,33
           143          3 Typ=2 Len=3: 194,2,44
           154          3 Typ=2 Len=3: 194,2,55
           165          3 Typ=2 Len=3: 194,2,66
           176          3 Typ=2 Len=3: 194,2,77
           187          3 Typ=2 Len=3: 194,2,88
           198          3 Typ=2 Len=3: 194,2,99
           209          3 Typ=2 Len=3: 194,3,10
           220          3 Typ=2 Len=3: 194,3,21
           231          3 Typ=2 Len=3: 194,3,32
           242          3 Typ=2 Len=3: 194,3,43
           253          3 Typ=2 Len=3: 194,3,54
           264          3 Typ=2 Len=3: 194,3,65
           275          3 Typ=2 Len=3: 194,3,76
           286          3 Typ=2 Len=3: 194,3,87
           297          3 Typ=2 Len=3: 194,3,98
           308          3 Typ=2 Len=3: 194,4,9
           319          3 Typ=2 Len=3: 194,4,20
           330          3 Typ=2 Len=3: 194,4,31
           341          3 Typ=2 Len=3: 194,4,42
           352          3 Typ=2 Len=3: 194,4,53
           363          3 Typ=2 Len=3: 194,4,64
           374          3 Typ=2 Len=3: 194,4,75
           385          3 Typ=2 Len=3: 194,4,86
           396          3 Typ=2 Len=3: 194,4,97
           407          3 Typ=2 Len=3: 194,5,8
           418          3 Typ=2 Len=3: 194,5,19
           429          3 Typ=2 Len=3: 194,5,30
           440          3 Typ=2 Len=3: 194,5,41
           451          3 Typ=2 Len=3: 194,5,52
           462          3 Typ=2 Len=3: 194,5,63
           473          3 Typ=2 Len=3: 194,5,74
           484          3 Typ=2 Len=3: 194,5,85
           495          3 Typ=2 Len=3: 194,5,96
           506          3 Typ=2 Len=3: 194,6,7
           517          3 Typ=2 Len=3: 194,6,18
           528          3 Typ=2 Len=3: 194,6,29
           539          3 Typ=2 Len=3: 194,6,40
           550          3 Typ=2 Len=3: 194,6,51
           561          3 Typ=2 Len=3: 194,6,62
           572          3 Typ=2 Len=3: 194,6,73
           583          3 Typ=2 Len=3: 194,6,84
           594          3 Typ=2 Len=3: 194,6,95
           605          3 Typ=2 Len=3: 194,7,6
           616          3 Typ=2 Len=3: 194,7,17
           627          3 Typ=2 Len=3: 194,7,28
           638          3 Typ=2 Len=3: 194,7,39
           649          3 Typ=2 Len=3: 194,7,50
           660          3 Typ=2 Len=3: 194,7,61
           671          3 Typ=2 Len=3: 194,7,72
           682          3 Typ=2 Len=3: 194,7,83
           693          3 Typ=2 Len=3: 194,7,94
           704          3 Typ=2 Len=3: 194,8,5
           715          3 Typ=2 Len=3: 194,8,16
           726          3 Typ=2 Len=3: 194,8,27
           737          3 Typ=2 Len=3: 194,8,38
           748          3 Typ=2 Len=3: 194,8,49
           759          3 Typ=2 Len=3: 194,8,60
           770          3 Typ=2 Len=3: 194,8,71
           781          3 Typ=2 Len=3: 194,8,82
           792          3 Typ=2 Len=3: 194,8,93
           803          3 Typ=2 Len=3: 194,9,4
           814          3 Typ=2 Len=3: 194,9,15
           825          3 Typ=2 Len=3: 194,9,26
           836          3 Typ=2 Len=3: 194,9,37
           847          3 Typ=2 Len=3: 194,9,48
           858          3 Typ=2 Len=3: 194,9,59
           869          3 Typ=2 Len=3: 194,9,70
           880          3 Typ=2 Len=3: 194,9,81
           891          3 Typ=2 Len=3: 194,9,92
           902          3 Typ=2 Len=3: 194,10,3
           913          3 Typ=2 Len=3: 194,10,14
           924          3 Typ=2 Len=3: 194,10,25
           935          3 Typ=2 Len=3: 194,10,36
           946          3 Typ=2 Len=3: 194,10,47
           957          3 Typ=2 Len=3: 194,10,58
           968          3 Typ=2 Len=3: 194,10,69
           979          3 Typ=2 Len=3: 194,10,80
           990          3 Typ=2 Len=3: 194,10,91
          1001          4 Typ=2 Len=3: 194,11,2
          1012          4 Typ=2 Len=3: 194,11,13
          1023          4 Typ=2 Len=3: 194,11,24
          1034          4 Typ=2 Len=3: 194,11,35
          1045          4 Typ=2 Len=3: 194,11,46
          1056          4 Typ=2 Len=3: 194,11,57
          1067          4 Typ=2 Len=3: 194,11,68
          1078          4 Typ=2 Len=3: 194,11,79
          1089          4 Typ=2 Len=3: 194,11,90
          1100          4 Typ=2 Len=2: 194,12
    100 rows selected.
    SQL>Note: Length is a string function, so an implicit conversion takes place turning the number to a string before calculating the length of that string in characters, but that doesn't reflect the number of bytes in storage. Also remember the internal storage has to store the datatype and the length of the datatype as well as the actual data.

  • How do I write and read a specified number of bytes using C++?

    I need to send one byte commands followed by 1 or 2 byte data as well as read 1 or 2 byte commands from a RS232 device. How do I ensure that only 1 byte is sent for the commands or 2 bytes of data using VISA?

    Hey BMas05,
    Using VISA in C++ you can strings or bytes depending on which polymorphic version of the write you are using. One of the parameters for the VISA Write is the byte array and the number of bytes. This is if you are using the VISA classes for C++. You might have to have Measurement Studio to get these classes.
    There is a really good example that installs on your computer at C:\Program Files\National Instruments\MeasurementStudio\VC\Examples\Io\Visa\Serial Visa.
    This example shows how you can write just bytes or strings and you can select how many bytes to read back.
    I hope this helps out.
    JoshuaP
    National Instruments

  • Reading unknown number of bytes !

    Hi all !
    I am trying to read unknown number of bytes from the socket.Meanwhile I need to process the bytes depending on the message type in the header.I get messages like this header,body,header,body header,body header,body.....the message type is specified in the header.Each message type has different body size.So depending on that I have to read the next few bytes from the socket....say 300 or 600 depending the on the message type in the header.I get the bytes continioulsy like this.Since I cannot read byte by byte due performance reason is there any other way to do that.....any help will appreciated
    sash

    A simple workaround is to use a java.io.PushbackInputStream
    Read enough bytes to get the header, parse the header bytes, and push the remainder back into the stream to be read as the body.

  • ORA-27063: number of bytes read/written is incorrect

    Hello -
    I am getting this error because my filesytem is at 100%:
    ORA-01114: IO error writing block to file 202 (block # 423324)
    ORA-27063: number of bytes read/written is incorrect
    However, when I query the dba_data_files, and v$datafile views, I do not see a reference to file 202. Where can I get this information?
    Thanks,
    Mike

    Mike,
    Looks like you got a solution, however, just FYI, tempfiles are numbered starting w/ db_files+1, so, likely, your value of db_files is 200, the error occurred on your number 2 tempfile.
    -Mark

Maybe you are looking for