Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!GIBBS.PHYSICS.PURDUE.EDU!ray
From: ray@GIBBS.PHYSICS.PURDUE.EDU (Ray Moody)
Newsgroups: gnu.bash.bug
Subject: Efficiency is important
Message-ID: <8906140559.AA23252@gibbs.physics.purdue.edu>
Date: 14 Jun 89 05:59:41 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 33


    Bash prints its prompts to stderr.  Stderr is unbuffered.  Thus,
bash makes one (expensive) write () system call for each character it
prints.  This eats our poor VAX 11/750 alive.

								Ray
-------------------------------------------------------------------------------
RCS file: RCS/shell.c,v
retrieving revision 0.99.1.2
diff -c -r0.99.1.2 shell.c
*** /tmp/,RCSt1023214	Wed Jun 14 00:54:32 1989
--- shell.c	Wed Jun 14 00:54:01 1989
***************
*** 188,193
    if (shell_initialized)
      shell_reinitialize ();
  
    /* Here's a hack.  If the name of this shell is "sh", then don't do
       any startup files; just try to be more like /bin/sh. */
    {

--- 188,198 -----
    if (shell_initialized)
      shell_reinitialize ();
  
+   /* Added Wed Jun 14 00:53:21 EST 1989 by Ray Moody */
+   /* We call setlinebuf () so that the readline package does not use
+      one (expensive) write () system call for each character it prints. */
+   setlinebuf(stderr);
+  
    /* Here's a hack.  If the name of this shell is "sh", then don't do
       any startup files; just try to be more like /bin/sh. */
    {