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Diffstat (limited to 'poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst')
-rw-r--r-- | poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst index 12aef3cbb7..725e6c2cd5 100644 --- a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst +++ b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst @@ -483,6 +483,31 @@ overview of their function and contents. You must set this variable in the external environment in order for it to work. + :term:`BB_PRESSURE_MAX_CPU` + The threshold for maximum CPU pressure before BitBake prevents the + scheduling of new tasks. Once the :term:`BB_PRESSURE_MAX_CPU` threshold + is exceeded, new tasks are not started until the pressure subsides to + below the threshold. If :term:`BB_PRESSURE_MAX_CPU` is not set, CPU + pressure is not monitored. A threshold can be set in ``conf/local.conf`` + as:: + + BB_PRESSURE_MAX_CPU = "500" + + :term:`BB_PRESSURE_MAX_IO` + The threshold for maximum IO pressure experienced before BitBake + prevents the scheduling of new tasks. The IO pressure is regulated in the + same way as :term:`BB_PRESSURE_MAX_CPU`. At this point in time, + experiments show that IO pressure tends to be short-lived and regulating + just the CPU can help to reduce it. + + :term:`BB_PRESSURE_MAX_MEMORY` + The threshold for maximum memory pressure experienced before BitBake + prevents the scheduling of new tasks. The memory pressure is regulated in + the same way as :term:`BB_PRESSURE_MAX_CPU`. Note that any memory + pressure indicates that a system is being pushed beyond its capacity. At + this point in time, experiments show that memory pressure tends to be + short-lived and regulating just the CPU can help to reduce it. + :term:`BB_RUNFMT` Specifies the name of the executable script files (i.e. run files) saved into ``${``\ :term:`T`\ ``}``. By default, the |