fix a dead link

[simgrid.git] / doc / doxygen / options.doc

diff --git a/doc/doxygen/options.doc b/doc/doxygen/options.doc
index 4b16add..59a5761 100644 (file)
--- a/doc/doxygen/options.doc
+++ b/doc/doxygen/options.doc
@@ -952,6 +952,18 @@ uses naive version of collective operations). Each collective operation can be m
 The behavior and motivation for this configuration option is identical with \a smpi/test, see
 Section \ref options_model_smpi_test for details.
 
+\subsection options_model_smpi_iprobe_cpu_usage smpi/iprobe-cpu-usage: Reduce speed for iprobe calls
+
+\b Default value: 1 (no change from default behavior)
+
+MPI_Iprobe calls can be heavily used in applications. To account correctly for the energy
+cores spend probing, it is necessary to reduce the load that these calls cause inside
+SimGrid.
+
+For instance, we measured a max power consumption of 220 W for a particular application but 
+only 180 W while this application was probing. Hence, the correct factor that should
+be passed to this option would be 180/220 = 0.81.
+
 \subsection options_model_smpi_init smpi/init: Inject constant times for calls to MPI_Init
 
 \b Default value: 0
@@ -1224,6 +1236,7 @@ It can be done by using XBT. Go to \ref XBT_log for more details.
 - \c smpi/host-speed: \ref options_smpi_bench
 - \c smpi/IB-penalty-factors: \ref options_model_network_coefs
 - \c smpi/iprobe: \ref options_model_smpi_iprobe
+- \c smpi/iprobe-cpu-usage: \ref options_model_smpi_iprobe_cpu_usage
 - \c smpi/init: \ref options_model_smpi_init
 - \c smpi/lat-factor: \ref options_model_smpi_lat_factor
 - \c smpi/ois: \ref options_model_smpi_ois