Contents.InstallationBefore configuring distcc, let's first look into the installation of the package on all hosts.Requirements across all hostsIn order to use distcc, all of the computers on the network need to have the same GCC versions. For example, mixing 3.3.x (where the x varies) is okay, but mixing 3.3.x with 3.2.x may result in compilation errors or runtime errors.Verify that all systems use the same version of binutils (eselect binutils list) or many packages will fail linking with various errors like text relocation.USE flags. CODE Examples of host definitions 192.168.0.1 192.168.0.2 192.168.0.3192.168.0.1/2 192.168.0.2 192.168.0.3/10192.168.0.1:4000/2 192.168.0.2/1 192.168.0.3:3632/4@192.168.0.1 @192.168.0.2:/usr/bin/distccd 192.168.0.3There are also several other methods of setting up hosts. See the distcc man page ( man distcc) for more details.If compilations should also occur on the local machine, put localhost in the hosts list. Conversely if the local machine is not to be used to compile, omit it from the hosts list.

Jump to Installation - Installation. Before configuring distcc, let's first look into the installation of the sys-devel/distcc package on all hosts. Trying to build Gentoo Prefix in Mac OS - ftp unknown host error. Solved - installed wget via MacPorts and changed line 37 in the script to.

On a slow machine using localhost may actually slow things down. Make sure to test the settings for performance.Let's configure distcc to use the hosts mentioned on the first line in the example.

Root # /usr/bin/distcc-config -set-hosts '192.168.0.1 192.168.0.2 192.168.0.3'Distcc also supports a pump mode, by invoking the pump command. This may significantly reduce build time when multiple files are compiled in parallel. It caches preprocessed headers on the server side and, as a result, gets rid of repeated uploading and preprocessing of these header files.To configure a host for pump mode, add the,cpp,lzo suffix to the hosts definitions. Pump mode requires both cpp and lzo flags (regardless of the files being C or C). Root # /usr/bin/distcc-config -set-hosts '192.168.0.1,cpp,lzo 192.168.0.2,cpp,lzo 192.168.0.3,cpp,lzo' Usage With PortageSetting up to use distcc is easy. Root # USE='-.' emerge -nodeps sys-devel/distccYou may receive an error similar to the following when attempting to install distcc:!!!

Problem resolving dependencies for sys-devel/distcc!!! The ebuild selected to satisfy 'sys-devel/distcc' has unmet requirements.- sys-devel/distcc-3.2rc1-r4::gentoo USE='-crossdev -gnome -gssapi -gtk -hardened -ipv6 (-selinux) -xinetd -zeroconf' ABIX86='(64)' PYTHONTARGETS='-python27'The following REQUIREDUSE flag constraints are unsatisfied:pythontargetspython27This can be fixed using the following command.

NoteDuring bootstrap and emerge @system distcc may not appear to be used. This is expected as some ebuilds do not work well with distcc, so they intentionally disable it. ExtrasThe distcc application has additional features and applications to support working in a distcc environment.Monitoring utilitiesDistcc ships with two monitoring utilities. The text-based monitoring utility is always built and is called distccmon-text. Running it for the first time can be a bit confusing, but it is really quite easy to use.

If the program is run with no parameter it will run just once. However, if it is passed a number it will update every N seconds, where N is the argument that was passed. User $./main Hello distcc!

TroubleshootingIf a problem occurs while using distcc, then this section might help in resolving the problem.ERROR: failed to open /var/log/distccd.logAs of January 22nd, 2015 emerging fails to create the proper distccd.log file in /var/log/. This apparently only effects version 3.1-r8 of distcc. This bug is in the process of being corrected (see ). It is possible to work around this by manually creating the log file, giving it proper ownership, and restarting the distccd daemon. NoteHaving the right version of gcc as a slot on a server isn’t enough. Portage uses distcc as a replacement for the compiler referenced by the CHOST variable (i.e. X8664-pc-linux-gnu) and distccd invokes it by exactly same name.

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The right version of gcc should be a default system’s compiler on all involved compilation hosts.march=nativeStarting with GCC 4.3.0, the compiler supports the -march=native option which turns on CPU auto-detection and optimizations that are worth being enabled on the processor on which GCC is running. This creates a problem when using distcc because it allows the mixing of code optimized for different processors.

For example, running distcc with -march=native on a system that has an AMD Athlon processor and doing the same on another system that has an Intel Pentium processor will mix code compiled on both processors together.Heed the following warning. Export DISTCCVERBOSE = 1The verbose logging can then be found in /var/tmp/portage/$CATEGORY/$PF/temp/build.log.Keep in mind that the first distcc invocation visible in build.log isn’t necessary the first distcc call during a build process. For example a build server can get a one-minute backoff period during the configuration stage when some checks are performed using a compiler ( distcc sets a backoff period when compilation on a remote server failed, it doesn’t matter whether it failed on local machine or not).Dig into the /var/tmp/portage/$CATEGORY/$PF/work/ directory to investigate such situations.

Find other logs, or call make explicitly from within the working directory.Another interesting variable to use is DISTCCSAVETEMPS. When set, it saves the standard output/error from a remote compiler which, for Portage builds, results in files in the /var/tmp/portage/$CATEGORY/$PF/temp/ directory.

Export DISTCCSAVETEMPS = 1 See also. — shows the reader how to set up distcc for cross-compiling across different processor architectures.External resources.This page is based on a document formerly found on our main website.The following people contributed to the original document: Lisa Seelye, Erwin, Lars Weiler, Tiemo Kieft, andThey are listed here because wiki history does not allow for any external attribution. If you edit the wiki article, please do not add yourself here; your contributions are recorded on each article's associated history page.