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README.md: Improve description of distcc usage

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jbu 2015-07-30 11:59:50 +02:00
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README.md
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@ -285,14 +285,29 @@ Setup the slaves (machines that will compile the code):
# xbps-install -Sy distcc
Modify the configuration to allow your local network machines to use distcc (e.g. `192.168.2.0/24`):
# echo "192.168.2.0/24" >> /etc/distcc/clients.allow
Enable and start the `distccd` service:
# ln -s /etc/sv/distccd /var/service
In the host (machine that executes xbps-src) enable the following settings in the `void-packages/etc/conf` file:
Install distcc on the host (machine that executes xbps-src) as well.
Unless you want to use the host as slave from other machines, there is no need
to modify the configuration.
On the host you can now enable distcc in the `void-packages/etc/conf` file:
XBPS_DISTCC=yes
XBPS_DISTCC_HOSTS="192.168.2.101 192.168.2.102"
XBPS_DISTCC_HOSTS="localhost/2 --localslots_cpp=24 192.168.2.101/9 192.168.2.102/2"
XBPS_MAKEJOBS=16
The example values assume a localhost CPU with 4 cores of which at most 2 are used for compiler jobs.
The number of slots for preprocessor jobs is set to 24 in order to have enough preprocessed data for other CPUs to compile.
The slave 192.168.2.101 has a CPU with 8 cores and the /9 for the number of jobs is a saturating choice.
The slave 192.168.2.102 is set to run at most 2 compile jobs to keep its load low, even if its CPU has 4 cores.
The XBPS_MAKEJOBS setting is increased to 16 to account for the possible parallelism (2 + 9 + 2 + some slack).
### Cross compiling packages for a target architecture