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docs/manual: add FAQ entry about speeding up the build process

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This is a very frequently asked question, so let's add a FAQ entry
about it, that we can progressively extend with more advices for our
users.

[Thomas: remove the part about your boss buying new hardware, as
suggested by reviewers.]

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
This commit is contained in:
Thomas Petazzoni 2015-01-14 22:48:13 +01:00
parent 298cd8eaa2
commit 33712d7a7c
1 changed files with 34 additions and 0 deletions
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docs/manual/faq-troubleshooting.txt
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@ -205,3 +205,37 @@ On this matter, the Buildroot developers make this position statement:
upgrades by upgrading the entire root filesystem image at once,
the image deployed to the embedded system is guaranteed to really
be the one that has been tested and validated.
[[faq-speeding-up-build]]
=== How to speed-up the build process?
Since Buildroot often involves doing full rebuilds of the entire
system that can be quite long, we provide below a number of tips to
help reduce the build time:
* Use a pre-built external toolchain instead of the default Buildroot
internal toolchain. By using a pre-built Linaro toolchain (on ARM)
or a Sourcery CodeBench toolchain (for ARM, x86, x86-64, MIPS,
etc.), you will save the build time of the toolchain at each
complete rebuild, approximately 15 to 20 minutes. Note that
temporarily using an external toolchain does not prevent you to
switch back to an internal toolchain (that may provide a higher
level of customization) once the rest of your system is working;
* Use the +ccache+ compiler cache (see: xref:ccache[]);
* Learn about rebuilding only the few packages you actually care
about (see xref:rebuild-pkg[]), but beware that sometimes full
rebuilds are anyway necessary (see xref:full-rebuild[]);
* Make sure you are not using a virtual machine for the Linux system
used to run Buildroot. Most of the virtual machine technologies are
known to cause a significant performance impact on I/O, which is
really important for building source code;
* Make sure that you're using only local files: do not attempt to do
a build over NFS, which significantly slows down the build. Having
the Buildroot download folder available locally also helps a bit.
* Buy new hardware. SSDs and lots of RAM are key to speeding up the
builds.