[BusyBox] [PATCH] size optimization for fdformat.c
Tito
farmatito at tiscali.it
Thu Jan 22 15:43:06 UTC 2004
On Thursday 22 January 2004 13:59, you wrote:
> Hello,
>
> On Thu, Jan 22, 2004 at 02:14:14PM +0000, Tito wrote:
> > on the other side all the error obj files sum up to about 9k so by using
> > one function there would be size reduction to balance the overhead of one
> > more arg for every function and also the number of x and other bb
> > functions would decrease
> > saving more space.
> >
> > -rw-r--r-- 1 root root 968 Jan 6 14:19
> > error_msg_and_die.o -rw-r--r-- 1 root root 864 Jan 6
> > 14:19 error_msg.o -rw-r--r-- 1 root root 892 Jan 6 14:19
> > herror_msg_and_die.o -rw-r--r-- 1 root root 792 Jan 6
> > 14:19 herror_msg.o -rw-r--r-- 1 root root 892 Jan 6
> > 14:19 perror_msg_and_die.o -rw-r--r-- 1 root root 792 Jan
> > 6 14:19 perror_msg.o -rw-r--r-- 1 root root 808 Jan 6
> > 14:20 perror_nomsg_and_die.o -rw-r--r-- 1 root root 788
> > Jan 6 14:20 perror_nomsg.o -rw-r--r-- 1 root root 1080
> > Jan 6 14:20 verror_msg.o -rw-r--r-- 1 root root 1028 Jan
> > 6 14:20 vherror_msg.o -rw-r--r-- 1 root root 1092 Jan 6
> > 14:20 vperror_msg.o tot. 9996
> >
> > and last but not least we would have a more flexible (and easy) api which
> > could lead to more size optimization.
>
> The size reported by 'ls' is meaningless in this contexts. You need to
> use 'size' to see how much each object adds to the text, data, and bss
> sections.
Ops.
Thanks for the explanation.
size -t *error*msg*.o
text data bss dec hex filename
38 0 0 38 26 error_msg_and_die.o
31 0 0 31 1f error_msg.o
25 0 0 25 19 herror_msg_and_die.o
17 0 0 17 11 herror_msg.o
25 0 0 25 19 perror_msg_and_die.o
17 0 0 17 11 perror_msg.o
7 0 0 7 7 perror_nomsg_and_die.o
9 0 0 9 9 perror_nomsg.o
61 0 0 61 3d verror_msg.o
68 0 0 68 44 vherror_msg.o
86 0 0 86 56 vperror_msg.o
384 0 0 384 180 (TOTALS)
> To get a breakdown of sizes for functions and data within an object
> file, you can use something like 'nm -S --size-sort -t d <object file>'.
like this ?
busybox-1.00-pre5_new/libbb# nm -S --size-sort -t d *error*msg*.o
error_msg_and_die.o:
0000000000000000 0000000000000038 T bb_error_msg_and_die
error_msg.o:
0000000000000000 0000000000000031 T bb_error_msg
herror_msg_and_die.o:
0000000000000000 0000000000000025 T bb_herror_msg_and_die
herror_msg.o:
0000000000000000 0000000000000017 T bb_herror_msg
perror_msg_and_die.o:
0000000000000000 0000000000000025 T bb_perror_msg_and_die
perror_msg.o:
0000000000000000 0000000000000017 T bb_perror_msg
perror_nomsg_and_die.o:
0000000000000000 0000000000000007 T bb_perror_nomsg_and_die
perror_nomsg.o:
0000000000000000 0000000000000009 T bb_perror_nomsg
verror_msg.o:
0000000000000000 0000000000000056 T bb_verror_msg
vherror_msg.o:
0000000000000000 0000000000000064 T bb_vherror_msg
vperror_msg.o:
0000000000000000 0000000000000076 T bb_vperror_msg
root at localhost:/dev/pts/3:/rep/busybox_old20031712/busybox-1.00-pre5_new/libbb#
> Manuel
Tito
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