Date: Wed, 5 Jan 2005 15:48:42 GMT From: Bruce Campbell <bruce@engmail.uwaterloo.ca> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/75855: getpwent functions on 5.3 with large password file extremely slow Message-ID: <200501051548.j05Fmgqn067410@www.freebsd.org> Resent-Message-ID: <200501051550.j05FoksP050911@freefall.freebsd.org>
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>Number: 75855 >Category: misc >Synopsis: getpwent functions on 5.3 with large password file extremely slow >Confidential: no >Severity: non-critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Jan 05 15:50:46 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Bruce Campbell >Release: 5.3-RELEASE >Organization: University of Waterloo >Environment: FreeBSD ecserv14.uwaterloo.ca 5.3-RELEASE FreeBSD 5.3-RELEASE #0: Fri Dec 24 12:26:55 EST 2004 root@ecserv14.uwaterloo.ca:/usr/src/sys/i386/compile/SMP i386 >Description: getpwnam or getpwuid on our system with over 10,000 entries in /etc/master.passwd is slow and uses alot of resources. >How-To-Repeat: Create an /etc/master.passwd with 10,000 entries. Run this program: #include <sys/types.h> #include <pwd.h> main( int argc, char *argv[] ) { getpwnam( "someid" ); } if run with truss, it can be seen doing 1,000 to 100,000 repetitions of lseek(3,0x5d3000,SEEK_SET) = 6107136 (0x5d3000) read(0x3,0x8061000,0x1000) = 4096 (0x1000) lseek(3,0x5d4000,SEEK_SET) = 6111232 (0x5d4000) read(0x3,0x8062000,0x1000) = 4096 (0x1000) where file handle 3 is /etc/spwd.db >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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