Subject: shared vs. unshared libcc1: numbers for x86.
To: Scott Reynolds <firstname.lastname@example.org>
From: Bill Sommerfeld <email@example.com>
Date: 02/09/1999 23:48:36
Here are numbers for -current on x86 with compilers as of last night's
The benchmark I picked was a build of the GENERIC_TINY kernel
configuration in a freshly configured directory.
Runs were done on a PentiumII/266 with 64 meg of memory and all
relevant filesyustems on a single 4gig narrow SCSI disk, with /tmp in
I ran each case three times in sequence to see what kind of
variability in timing I'd get; I didn't get much, so I summed the
times and compared them.
(wall time within 0.8%; user cpu within 0.6%)
make: 429.55s user 34.97s sys 507.52s wall
make: 430.68s user 34.05s sys 509.56s wall
make: 431.87s user 33.63s sys 505.64s wall
total: 1292.10s user, 1522.72s wall
(wall times times are within 0.4%; user cpu usage within 0.2%)
make: 377.36s user 33.34s sys 453.86s wall
make: 377.39s user 32.92s sys 452.24s wall
make: 376.86s user 33.14s sys 452.75s wall
total: 1131.61s user 1358.85s wall
For this benchmark on x86, shared libcc1 uses 12% more wall time, and
uses 14% more cpu time.
shared library: file size
1464 -r--r--r-- 1 root wheel 1488658 Feb 9 22:11 /usr/lib/libcc1.so.1.1
232 -r-xr-xr-x 1 root wheel 229376 Feb 9 22:11 /usr/libexec/cc1
304 -r-xr-xr-x 1 root wheel 303104 Feb 9 22:11 /usr/libexec/cc1obj
720 -r-xr-xr-x 1 root wheel 729088 Feb 9 22:11 /usr/libexec/cc1plus
664 -r-xr-xr-x 1 root wheel 667648 Feb 9 22:11 /usr/libexec/f771
3384 blocks for shared libcc1
1408 -r-xr-xr-x 1 root wheel 1429504 Feb 9 22:39 /usr/libexec/cc1
1472 -r-xr-xr-x 1 root wheel 1499136 Feb 9 22:39 /usr/libexec/cc1obj
1864 -r-xr-xr-x 1 root wheel 1900544 Feb 9 22:39 /usr/libexec/cc1plus
1832 -r-xr-xr-x 1 root wheel 1867776 Feb 9 22:40 /usr/libexec/f771
6576 blocks for unshared libcc1
On x86, unshared libcc1 uses 94% more disk space than shared.