Differences

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--- hpc:32bit [2010/02/24 15:19] – created 172.26.0.166
+++ hpc:32bit [2010/05/22 14:19] (current) – removed aorth
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-===== 32 bit on HPC =====
-Most of our applications are 64 bit so we don't need the 32-bit versions installed.  There are almost 300 32-bit applications installed, most of which can be safely removed.
-  * Relevant CentOS FAQ entry: http://wiki.centos.org/FAQ/General#head-357346ff0bf7c14b0849c3bcce39677aaca528e9
-One exception is the ''compat-libstdc++.i386'' and related libraries which simple 32-bit applications need in order to run (we can reinstall it later). ''nest'' is one such application:
-<code>$ ldd /paracel/paracel/biosoft/PSPP/software/jackal/nest/nest
-        linux-gate.so.1 =>  (0xffffe000)
-        libstdc++-libc6.2-2.so.3 => /usr/lib/libstdc++-libc6.2-2.so.3 (0xf7ef0000)
-        libm.so.6 => /lib/libm.so.6 (0x00b3f000)
-        libc.so.6 => /lib/libc.so.6 (0x009e0000)
-        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00b6e000)
-        /lib/ld-linux.so.2 (0x009c2000)</code>
-Compare that with a native 64-bit application:
-<code>$ ldd /bin/ls
-        librt.so.1 => /lib64/librt.so.1 (0x00000039ace00000)
-        libacl.so.1 => /lib64/libacl.so.1 (0x00000039aca00000)
-        libselinux.so.1 => /lib64/libselinux.so.1 (0x00000039ad200000)
-        libc.so.6 => /lib64/libc.so.6 (0x00000039aba00000)
-        libpthread.so.0 => /lib64/libpthread.so.0 (0x00000039ac600000)
-        /lib64/ld-linux-x86-64.so.2 (0x00000039ab600000)
-        libattr.so.1 => /lib64/libattr.so.1 (0x00000039b0200000)
-        libdl.so.2 => /lib64/libdl.so.2 (0x00000039ac200000)
-        libsepol.so.1 => /lib64/libsepol.so.1 (0x00000039ad600000)</code>
-We will make a list of installed 32-bit packages just in case we need to reinstall one: {{:hpc:32bit_packages.txt}}
-<code># yum list installed \*.i\?86 > 32bit_packages.txt</code>
-Then we can remove them:
-<code># yum remove \*.i\?86</code>
-There's a few packages and their dependencies we need to reinstall:
-<code># yum install foundation-redhat glibc.i686 redhat-lsb.i386 compat-libstdc++-33.i386 compat-libstdc++-296.i386 libxml2.i386</code>
-If you get errors about missing libraries (certain 32 bit apps):
-<code># sbadmin
--bash: /usr/bin/sbadmin: /lib/ld-lsb.so.1: bad ELF interpreter: No such file or directory</code>
-You can fix that by creating the correct symbolic link to the new version of the library:
-<code># ln -s /lib/ld-2.5.so /lib/ld-lsb.so.1</code>
-I don't know which Redhat/CentOS package was originally providing that file, but the symlinks works, and is the solution to a common problem as according to the LSB itself: http://www.linuxbase.org/test/lsb-runtime-test-faq.html
-Reinstall the 32-bit X libs:
-<code># yum install $(egrep -i "^libX" 32bit_packages.txt | awk {'print $1'} | xargs)</code>