X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/c0a120daf1586f88922362265dc53f93228f61d9..34b1612aaf4fb4375dc39f42941027e56b80aafa:/docs/source/Configuring_SimGrid.rst diff --git a/docs/source/Configuring_SimGrid.rst b/docs/source/Configuring_SimGrid.rst index 172de945d9..3df5bdd0ed 100644 --- a/docs/source/Configuring_SimGrid.rst +++ b/docs/source/Configuring_SimGrid.rst @@ -634,9 +634,12 @@ receive call for small messages sent when the system buffers are empty. In SMPI, this depends on the message size, that is compared against two thresholds: - if (size < :ref:`smpi/async-small-thresh `) then - MPI_Send returns immediately, even if the corresponding receive has not be issued yet. -- if (:ref:`smpi/async-small-thresh ` < size < :ref:`smpi/send-is-detached-thresh `) then - MPI_Send returns as soon as the corresponding receive has been issued. This is known as the eager mode. + MPI_Send returns immediately, and the message is sent even if the + corresponding receive has not be issued yet. This is known as the eager mode. +- if (:ref:`smpi/async-small-thresh ` < size < + :ref:`smpi/send-is-detached-thresh `) then + MPI_Send also returns immediately, but SMPI waits for the corresponding + receive to be posted, in order to perform the communication operation. - if (:ref:`smpi/send-is-detached-thresh ` < size) then MPI_Send returns only when the message has actually been sent over the network. This is known as the rendez-vous mode.