Glenn Fowler wrote:
> by "Bourne shell" do you mean bash?
No... the old Bourne shell, still shipped on Solaris as /usr/bin/sh
and /sbin/sh.
>
> what is the system(3) implementation?
> when you test the "bourne shell" system() vs the ksh93 system()
> how do you tell system() to exclusively use one shell over the other?
>
> what is the output of
> ldd "bourne shell"
> vs
> ldd ksh93
>
>
: barts at cyber[250]; ldd /usr/bin/sh
libgen.so.1 => /lib/libgen.so.1
libsecdb.so.1 => /lib/libsecdb.so.1
libc.so.1 => /lib/libc.so.1
libnsl.so.1 => /lib/libnsl.so.1
libmp.so.2 => /lib/libmp.so.2
libmd.so.1 => /lib/libmd.so.1
libscf.so.1 => /lib/libscf.so.1
libuutil.so.1 => /lib/libuutil.so.1
libm.so.2 => /lib/libm.so.2
: barts at cyber[251]; ldd /usr/bin/i86/ksh93
libshell.so.1 => /usr/lib/libshell.so.1
libc.so.1 => /lib/libc.so.1
libcmd.so.1 => /usr/lib/libcmd.so.1
libdll.so.1 => /usr/lib/libdll.so.1
libast.so.1 => /usr/lib/libast.so.1
libsocket.so.1 => /lib/libsocket.so.1
libsecdb.so.1 => /lib/libsecdb.so.1
libm.so.2 => /lib/libm.so.2
libnsl.so.1 => /lib/libnsl.so.1
libmp.so.2 => /lib/libmp.so.2
libmd.so.1 => /lib/libmd.so.1
libscf.so.1 => /lib/libscf.so.1
libuutil.so.1 => /lib/libuutil.so.1
libgen.so.1 => /lib/libgen.so.1
: barts at cyber[252];
Roland Mainz wrote:
> 2. Did you measure /usr/bin/ksh93 or /usr/bin/i86/ksh93 ? /usr/bin/ksh93
> is a hardlink to /usr/lib/isaexec (since we ship a 64bit version of
> ksh93) which contributes at least a (heavy-wheight) |exec()| call (David
> Comay avoided this in his patch for Indiana via linking /sbin/sh to
> /usr/bin/i86/ksh93 directly)
Changing /sbin/sh to avoid isexec trimmed the time by a factor of ~1.5;
it's still slower by a good bit.
> 3. Which locale did you use (e.g. what is the output of $ env | egrep
> "LC_|LANG" #) ?
C locale
> 4. Could you please list the command sequence to measure the startup
> time of both Bourne shell and ksh93 ?
I used libmicro's system benchmark and just replaced /sbin/sh w/ a
variants I wanted to try.
- Bart
--
Bart Smaalders Solaris Kernel Performance
barts at cyber.eng.sun.com http://blogs.sun.com/barts
