<!--$Id: macosx.so,v 11.14 2005/10/21 20:16:41 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB Reference Guide: Mac OS X</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td><b><dl><dt>Berkeley DB Reference Guide:<dd>Building Berkeley DB for UNIX/POSIX systems</dl></b></td> <td align=right><a href="../build_unix/linux.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../build_unix/osf1.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p align=center><b>Mac OS X</b></p> <ol> <p><li><b>When trying to link multiple Berkeley DB language interfaces (for example, Tcl, C++, Java, Python) into a single process, I get "multiple definitions" errors from dyld.</b> <p>To fix this problem, set the environment variable MACOSX_DEPLOYMENT_TARGET to 10.3 (or your current version of OS X), and reconfigure and rebuild Berkeley DB from scratch. See the OS X ld(1) and dyld(1) man pages for information about how OS X handles symbol namespaces, as well as undefined and multiply-defined symbols.</p> <p><li><b>When trying to use system-backed shared memory on OS X I see failures about "too many open files".</b> <p>The default number of shared memory segments on OS X is too low. To fix this problem, edit the file /etc/rc, changing the kern.sysv.shmmax and kern.sysv.shmseg values as follows:</p> <blockquote><pre>*** /etc/rc.orig Fri Dec 19 09:34:09 2003 --- /etc/rc Fri Dec 19 09:33:53 2003 *************** *** 84,93 **** # System tuning sysctl -w kern.maxvnodes=$(echo $(sysctl -n hw.physmem) '33554432 / 512 * 1024 +p'|dc) ! sysctl -w kern.sysv.shmmax=4194304 sysctl -w kern.sysv.shmmin=1 sysctl -w kern.sysv.shmmni=32 ! sysctl -w kern.sysv.shmseg=8 sysctl -w kern.sysv.shmall=1024 if [ -f /etc/sysctl-macosxserver.conf ]; then awk '{ if (!-1 && -1) print $1 }' < /etc/sysctl-macosxserver.conf | while read --- 84,93 ---- # System tuning sysctl -w kern.maxvnodes=$(echo $(sysctl -n hw.physmem) '33554432 / 512 * 1024 +p'|dc) ! sysctl -w kern.sysv.shmmax=134217728 sysctl -w kern.sysv.shmmin=1 sysctl -w kern.sysv.shmmni=32 ! sysctl -w kern.sysv.shmseg=32 sysctl -w kern.sysv.shmall=1024 if [ -f /etc/sysctl-macosxserver.conf ]; then awk '{ if (!-1 && -1) print $1 }' < /etc/sysctl-macosxserver.conf | while read</pre></blockquote> <p>and then reboot the system.</p> </ol> <table width="100%"><tr><td><br></td><td align=right><a href="../build_unix/linux.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../build_unix/osf1.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>