How the JIT is useful

I have a doubt about JIT.......
what is the task of JIT in jvm

Can i test the performance of HotSpot in JVM? I am
designing a testing program to test the performance
of Java, including of JVM - bytecode compilation at
run-time. How feasible to test thatYou can test the difference between pure interpretation ("-Xint") and compiled code ("-Xcomp").
Or maybe you want "-XX:+CITime" and/or "-XX:+PrintCompilation".
You might also want to have a look at
-XX:CompileCommand=<value>     ccstr     ""     Prepend to .hotspot_compiler; e.g. log,java/lang/String.
-XX:CompileCommandFile=<value>     ccstr     ""     Read compiler commands from this file [.hotspot_compiler]
-XX:CompileOnly=<value>     ccstr     ""     List of methods (pkg/class.name) to restrict compilation to
There's a list of options here.
get hold of a source code?
Sun Community Source Licensing (SCSL).

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    *****&  Transaction code      : ZTCODE_USAGE                           *
    *****&  Developer name        : Shailendra Kolakaluri                  *
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    *****&  Transport No          : DEVK906086                                       *
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    DATA: ind TYPE i,
          fcat TYPE slis_t_fieldcat_alv WITH HEADER LINE,
          layout TYPE slis_layout_alv,
          variant TYPE disvariant,
          events  TYPE slis_t_event WITH HEADER LINE,
          heading TYPE slis_t_listheader WITH HEADER LINE.
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      user   TYPE swncuname,
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      tcode     TYPE swnctcode,
      report TYPE swncreportname,
      count     TYPE swncshcnt,
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    *data   : date type n.
    DATA: t_usertcode  TYPE swnc_t_aggusertcode,
          wa_usertcode TYPE swncaggusertcode,
          wa           TYPE zusertcode,
          t_ut         TYPE STANDARD TABLE OF zusertcode,
          wa_result    TYPE zusertcode,
          t_result     TYPE STANDARD TABLE OF zusertcode.
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    fcat-fieldname   = 'DATE'.
    fcat-seltext_l   = 'Date'.
    fcat-key         = 'X'.
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      fcat-fieldname   = 'MANDT'.
      fcat-seltext_l   = 'Client'.
      fcat-key         = 'X'.
      APPEND fcat.
      CLEAR fcat.
      fcat-tabname     = 't_ut'.
      fcat-fieldname   = 'USER'.
      fcat-seltext_l   = 'User Name'.
      fcat-key         = 'X'.
      APPEND fcat.
      CLEAR fcat.
      fcat-tabname     = 't_ut'.
      fcat-fieldname   = 'TCODE'.
      fcat-seltext_l   = 'Transaction Code'.
      fcat-key         = 'X'.
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          text
    -->  p1        text
    <--  p2        text
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    -->  p1        text
    <--  p2        text
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    events-form = 'TOP_OF_PAGE'.
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    *ENDFORM.                    " GET_EVENT
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          text
    -->  p1        text
    <--  p2        text
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    DATA: text(30).
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    heading-info = text.
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    *ENDFORM.                    " GET_COMMENT
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    -->  p1        text
    <--  p2        text
    *FORM top_of_page .
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         it_list_commentary       = heading[]
      I_LOGO                   =
      I_END_OF_LIST_GRID       =
    *ENDFORM.                    " top_of_page
    *&      Form  DISPLAY_DATA
          text
    -->  p1        text
    <--  p2        text
    FORM display_data .
      sort t_ut[].
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      CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
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          i_callback_program = sy-cprog
          is_layout          = layout
          it_fieldcat        = fcat[]
          i_save             = 'A'
          is_variant         = variant
          it_events          = events[]
        TABLES
          t_outtab           = t_ut
        EXCEPTIONS
          program_error      = 1
          OTHERS             = 2.
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        MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
                WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
      ENDIF.
    ENDFORM.                    " DISPLAY_DATA

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  • How to install and use the CP2102 USART to USB Converter?

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    HOSTCC scripts/kconfig/zconf.tab.o
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    make[1]: Leaving directory '/usr/lib/modules/3.14.4-1-ARCH/build'
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    dbg("%s - port %d", __func__, port->number);
    ^
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    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:451:36: error: 'struct usb_serial_port' has no member named 'number'
    dbg("%s - port %d", __func__, port->number);
    ^
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_get_termios':
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:534:17: error: invalid type argument of '->' (have 'struct ktermios')
    &tty->termios->c_cflag, &baud);
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    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_get_termios_port':
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:556:36: error: 'struct usb_serial_port' has no member named 'number'
    dbg("%s - port %d", __func__, port->number);
    ^
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    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:706:21: error: invalid type argument of '->' (have 'struct ktermios')
    baud = tty->termios->c_ospeed;
    ^
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    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:735:36: error: 'struct usb_serial_port' has no member named 'number'
    dbg("%s - port %d", __func__, port->number);
    ^
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:740:22: error: invalid type argument of '->' (have 'struct ktermios')
    cflag = tty->termios->c_cflag;
    ^
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_tiocmset_port':
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:871:36: error: 'struct usb_serial_port' has no member named 'number'
    dbg("%s - port %d", __func__, port->number);
    ^
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_tiocmget':
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:910:36: error: 'struct usb_serial_port' has no member named 'number'
    dbg("%s - port %d", __func__, port->number);
    ^
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_break_ctl':
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:932:36: error: 'struct usb_serial_port' has no member named 'number'
    dbg("%s - port %d", __func__, port->number);
    ^
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_init':
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:989:2: error: implicit declaration of function 'usb_serial_register' [-Werror=implicit-function-declaration]
    retval = usb_serial_register(&cp210x_device);
    ^
    /home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:996:3: error: implicit declaration of function 'usb_serial_deregister' [-Werror=implicit-function-declaration]
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    make: *** [all] Error 2
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    ewaller wrote:<hopeful>Do you have an oscilloscope? </hopeful>
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    Which gives a a UBRR register value of 129 corresponding to normal speed (U2Xn = 0). This is all computed for me at compile-time via this formula:
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    GTKterm does not actually show you what you are typing into the terminal. That is, when you type a character then nothing is displayed to the screen. Presumably this character is sent out as you type it. I was under the impression that local echo would just echo what I type to the screen as well as send it out. Thank you for the clarification.
    Last edited by sherrellbc (2014-05-28 03:16:48)

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