Subject: Re: Very strange behaviour of LFS and TMPFS
To: Patrick Welche <prlw1@newn.cam.ac.uk>
From: Aleksey Cheusov <cheusov@tut.by>
List: netbsd-help
Date: 11/17/2007 22:05:35 
> On Wed, Nov 14, 2007 at 08:30:25PM +0200, Aleksey Cheusov wrote:
> ...
 >>      0 trtr>touch file0 
 >>      0 trtr>make file3  
> ...
 >> After toching file0, file3 is rebuilt NOT ALWAYS. Why?

> How long do you wait between the "touch" and the "make"?
You mix message from testing LFS/TMPFS and "after touching..." message
that concerns EXT2FS only.

LFS/TMPFS:
    0 trtr>touch file0; sleep 5; make file3
    cat file0 > file1
    `file3' is up to date.
    0 trtr>ls -lt file*
    -rw-r--r--  1 cheusov  syntagma  4 Nov 17 22:00 file1
    -rw-r--r--  1 cheusov  syntagma  4 Nov 17 22:00 file0
    -rw-r--r--  1 cheusov  syntagma  4 Nov 17 14:41 file3
    -rw-r--r--  1 cheusov  syntagma  4 Nov 17 14:41 file2
    -rw-r--r--  1 cheusov  syntagma  0 Nov 17 14:41 file0~
    0 trtr>

EXT2FS (works correctly):
     0 trtr>touch file0; sleep 5; make file3    
     cat file0 > file1
     cat file1 > file2
     cat file2 > file3
     0 trtr> 

But when I remove sleep 5 it sometimes fails:
     0 trtr>touch file0; sleep 5; make file3    
     cat file0 > file1
     cat file1 > file2
     cat file2 > file3
     0 trtr>touch file0; make file3          
     cat file0 > file1
     cat file1 > file2
     cat file2 > file3
     0 trtr>touch file0; make file3 
     cat file0 > file1
     cat file1 > file2
     cat file2 > file3
     0 trtr>touch file0; make file3 
     cat file0 > file1
     cat file1 > file2
     cat file2 > file3
     0 trtr>touch file0; make file3 
     `file3' is up to date.
     0 trtr>touch file0; make file3 
     cat file0 > file1
     cat file1 > file2
     cat file2 > file3
     0 trtr>touch file0; make file3 
     `file3' is up to date.

-- 
Best regards, Aleksey Cheusov.