Using IceCC

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IceCC and OE

It is possible to compile on a cluster of machines with OE, and quite easily so. To do so add the following to your local.conf:

ICECC_PARALLEL_MAKE = "-j 24"
INHERIT += "icecc"

General consensus is that ICECC_PARALLEL_MAKE should be between 2x to 4x the number of cores your CPU has. Too many and your PC will be unusable, too few and you won't keep the cluster busy.

Icecc and sstate interaction

Inheriting icecc will change the hashes for all tasks, so you cannot share sstate between builds that have icecc inherited and those that don't. The recommended solution is add support for icecream to all builds as follows:

INHERIT += "icecc"
ICECC_DISABLED ??= "1"

Now, users that want to use icecream can enable it by setting ICECC_DISABLED = "0", but everyone can still share sstate.

Recipe build failures

Many recipes may fail to build under icecream for a variety of reasons. If you find a recipe that does so, you can add it to ICECC_USER_PACKAGE_BL in local.conf.

We try to keep the system blacklist (ICECC_SYSTEM_PACKAGE_BL) up to date, but packages sometimes get missed (or aren't part of oe-core and don't get tested at all).

Note that any recipe that disables PARALLEL_MAKE by setting it to "" will automatically have icecream disabled.

Credits

Icecream support was originally implement by zecke, improved by Ifaistos, and most recently by Joshua Watt (JPEW)