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authorGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2015-01-14 22:48:13 +0100
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2015-02-03 15:15:27 +0100
commit33712d7a7cce08b07124a37a3cdf29c5f5b6def6 (patch)
treeb99b75a59f643834948fe79b1714d86cae2eb511 /docs/manual
parent298cd8eaa21a21eee85f9551a26ad294347b1d5a (diff)
downloadbuildroot-33712d7a7cce08b07124a37a3cdf29c5f5b6def6.tar.gz
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docs/manual: add FAQ entry about speeding up the build process
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>
Diffstat (limited to 'docs/manual')
-rw-r--r--docs/manual/faq-troubleshooting.txt34
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diff --git a/docs/manual/faq-troubleshooting.txt b/docs/manual/faq-troubleshooting.txt
index b30b4ac43c..825899b047 100644
--- a/docs/manual/faq-troubleshooting.txt
+++ b/docs/manual/faq-troubleshooting.txt
@@ -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.