X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a0618fb45de4cd048cc624be4ba3e1c10aa5d76d..62a8c46f194893c74a15db190c6029e82e5da81a:/doc/FAQ.doc

diff --git a/doc/FAQ.doc b/doc/FAQ.doc
index efa4d503f1..a6e162ec4a 100644
--- a/doc/FAQ.doc
+++ b/doc/FAQ.doc
@@ -1068,22 +1068,32 @@ you still don't see how to do it, please come back to us...
 
 \subsubsection faq_MIA_asynchronous I want to do asynchronous communications in MSG
 
-Up until now, there is no asynchronous communications in MSG. However,
-you can create as many process as you want so you should be able to do
-whatever you want... I've written a queue module to help implementing
-some asynchronous communications at low cost (creating thousands of
-process only to handle communications may be problematic in term of
-performance at some point). I'll add it in the distribution asap.
+In the past (version <= 3.4), there was no function to perform asynchronous communications. 
+It could easily be implemented by creating new process when needed though. Since version 3.5, 
+we have introduced the following functions:
+ - MSG_task_isend()
+ - MSG_task_irecv()
+ - MSG_comm_test()
+ - MSG_comm_wait()
+ - MSG_comm_waitall()
+ - MSG_comm_waitany()
+ - MSG_comm_destroy()
+
+We refer you to the description of these functions for more details on their usage as well 
+as to the exemple section on \ref MSG_ex_asynchronous_communications.
 
 \subsubsection faq_MIA_thread_synchronization I need to synchronize my MSG processes
 
-You obviously cannot use pthread_mutexes of pthread_conds. The best
-thing would be to propose similar structures. Unfortunately, we
-haven't found time to do it yet. However you can try to play with
-MSG_process_suspend() and MSG_process_resume(). You can even do some
-synchronization with fake communications (using MSG_task_get(),
+You obviously cannot use pthread_mutexes of pthread_conds since we handle every 
+scheduling related decision within SimGrid. 
+
+In the past (version <=3.3.4) you could do it by playing with
+MSG_process_suspend() and MSG_process_resume() or with fake communications (using MSG_task_get(),
 MSG_task_put() and MSG_task_Iprobe()).
 
+Since version 3.4, you can use classical synchronization structures. See page \ref XBT_synchro or simply check in
+include/xbt/synchro_core.h.
+
 \subsubsection faq_MIA_host_load Where is the get_host_load function hidden in MSG?
 
 There is no such thing because its semantic wouldn't be really
@@ -1563,6 +1573,29 @@ A number of options can be given at runtime to change the default
 SimGrid behavior. In particular, you can change the default cpu and
 network models...
 
+\subsubsection faq_simgrid_configuration_fullduplex Using Fullduplex
+
+Experimental fullduplex support is now available on the svn branch. In order to fullduple to work your platform must have two links for each pair
+of interconnected hosts, see an example here:
+\verbatim
+	simgrid_svn_sources/exemples/msg/gtnets/fullduplex-p.xml
+\endverbatim
+
+Using fullduplex support ongoing and incoming communication flows are
+treated independently for most models. The exception is the LV08 model which 
+adds 0.05 of usage on the opposite direction for each new created flow. This 
+can be useful to simulate some important TCP phenomena such as ack compression. 
+
+Running a fullduplex example:
+\verbatim
+	cd simgrid_svn_sources/exemples/msg/gtnets
+	./gtnets fullduplex-p.xml fullduplex-d.xml --cfg=fullduplex:1
+\endverbatim
+
+
+
+
+
 \subsubsection faq_simgrid_configuration_gtnets Using GTNetS
 
 It is possible to use a packet-level network simulator
@@ -2281,21 +2314,21 @@ so  you can exchange any kind of data ( tables, matrix, strings … ) between pr
 
 \li set Hosts
 \verbatim
-  simgrid.Host.new("Tremblay",98095000);
-  simgrid.Host.new("Jupiter",76296000);
-  simgrid.Host.new("Fafard",76296000);
-  simgrid.Host.new("Ginette",48492000);
-  simgrid.Host.new("Bourassa",48492000);
+  simgrid.Host.new{id="Tremblay",power=98095000};
+  simgrid.Host.new{id="Jupiter",power=76296000};
+  simgrid.Host.new{id="Fafard",power=76296000};
+  simgrid.Host.new{id="Ginette",power=48492000};
+  simgrid.Host.new{id="Bourassa",power=48492000};
 \endverbatim
-  we use simgrid.Host.new(host_id,power) to instanciate our hosts.
+  we use simgrid.Host.new{id=id_host,power=power_host} to instanciate our hosts.
 
 \li set Links
 \verbatim
   for i=0,11 do
-    simgrid.Link.new(i,252750+ i*768,0.000270544+i*0.087);    --  some crazy values ;)
+    simgrid.Link.new{id=i,bandwidth=252750+ i*768,latency=0.000270544+i*0.087};    --  some crazy values ;)
   end
 \endverbatim
-  we used simgrid.Link.new(link_id,bandwidth,latency) with a simple for loop to create all links we need  ( much easier than XML hein ? )
+  we used simgrid.Link.new{id=link_id,bandwidth=bw,latency=lat} with a simple for loop to create all links we need (much easier than XML hein ?)
 
 \li set Routes
 \verbatim
@@ -2852,3 +2885,4 @@ Nowadays, functions get automatically exported, so we don't need to load our
 header files with tons of __declspec(dllexport) cruft. We only need to do so
 for data, but there is no public data in SimGrid so we are good.
 
+