----- Original Message ----- From: "Matthew Burgess" <[EMAIL PROTECTED]> To: "LFS Developers Mailinglist" <lfs-dev@linuxfromscratch.org> Sent: Tuesday, October 07, 2008 10:19 PM Subject: Re: iana-etc with STRIP=yes
> On Tue, 7 Oct 2008 09:51:04 -0700, "Dan Nicholson" <[EMAIL PROTECTED]> wrote: > > > "barf" is my standard "make this program fail" input. I've yet to come > > across any conflicts with that assumption. :)# > > echo "barf" works for me :) > > Seriously, though, I would expect any reasonable program to call getent() once on startup and cache the result. As such, I'd much prefer to have the comments in the file than have them stripped. I can only assume that the embedded folks are after space savings rather than time savings by stripping the file. > > Regards, > > Matt. > I am afraid glibc may be not classed as a reasonable program. Following the URL I have posted, you could read that getservbyname() result is not cached. https://www.redhat.com/archives/fedora-devel-list/2006-January/msg00443.html The thread is from 2006 from a RH guy. I admit this is a bit old (work done for FC6) I have tested on my Centos-5.2 machine and that look true and unchanged. Caching could be a job for nscd but only passwd, group, hosts services look supported by nscd. Using google with 'glibc cache getservbyname', I have hits from Mac OSX and BSD, I haven't find something linux related. On this Cento machine (glibc-2.5), compiling the test app include in the above URL show ls -l /etc/{protocols,services} -rw-r--r-- 1 root root 6108 Oct 11 2006 /etc/protocols -rw-r--r-- 1 root root 362031 Feb 23 2006 /etc/services time ./getserverbyname-test foobar real 0m56.473s user 0m50.857s sys 0m5.627s time ./getserverbyname-test svn real 0m3.230s user 0m2.869s sys 0m0.362s On the same machine inside a chroot with glibc-2.7 and iana-etc-2.30 stripped ls -l /etc/{protocols,services} -rw-r--r-- 1 root root 2078 Oct 4 22:59 /etc/protocols -rw-r--r-- 1 root root 192217 Oct 4 22:59 /etc/services time ./getserverbyname-test foobar real 1m12.605s user 1m9.623s sys 0m2.996s time ./getserverbyname-test svn real 0m40.820s user 0m39.233s sys 0m1.595s So size is not everything ;-) CentOS services file has 9245 lines, etc-iana-2.30 stripped has 10308 lines. This explain why it is a bit longer with etc-iana-2.30 and foobar. svn is at line 533 on CentOS and at line 6633 with etc-iana-2.30 This explain why the answer is more than 10 faster on CentOS. On CentOS, all new entries have been placed after original ports list. In etc-iana-2.30, everything is in perfect port number order. On Centos etc/services file, compressnet is line 580 time ./getserverbyname-test compressnet real 0m3.502s user 0m3.098s sys 0m0.405s On etc-iana-2.30, compressnet is line 3 time ./getserverbyname-test compressnet real 0m0.322s user 0m0.098s sys 0m0.224s so this time etc-iana win by being 10 time faster Gilles -- http://linuxfromscratch.org/mailman/listinfo/lfs-dev FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
