Re: Looking for ANSI/VT100 code replacement.

From: Dan Nelson (dnelson_at_allantgroup.com)
Date: 05/21/05

  • Next message: alexander: "Re: Looking for ANSI/VT100 code replacement." 
    Date: Fri, 20 May 2005 18:08:45 -0500
To: alexander <arundel@h3c.de>

    In the last episode (May 21), alexander said:
    > I'd like to port an application that was written in x86 assembly for
    > Linux. So far all I had to do is change the Linux calling convention
    > (registers) to Posix style (stack).
    >
    > However at one point this application outputs 5 characters to stdout
    > (using syscall write and fd=1). These 5 characters however are then
    > being deleted and overwritten again. The application uses VT100 codes
    > to do this.
    >
    > First it moves the cursor to the left 5 times then it deletes
    > everything from the end of the line to the current cursor position.
    >
    > However this slows down the whole application. That's why I'd like to
    > replace that code with something faster.

    How often are you doing this? I wrote a quick microbenchmark and my
    pIII-900 box can do 80000 writes() per second of "\e[5D\e[Kabcde". I
    don't think that's your bottleneck. If it is, the usual solution is to
    not do a write on every iteration. You've got a (maximum) 100hz screen
    refresh rate anyhow, so doing more than 100 updates per second won't do
    you any good. Even 10 is probably more than you need. 

    -- 
	Dan Nelson
	dnelson@allantgroup.com
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  • Next message: alexander: "Re: Looking for ANSI/VT100 code replacement."

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