Changes between Version 3 and Version 4 of openmp_programming

Timestamp:

May 5, 2008, 4:32:31 PM (17 years ago)

Author:

rider

Comment:

--

openmp_programming

@@ -1 +1 @@
 = OpenMP Usage =
 == OpenMP Installation ==
-Env: Debian 4.0 amd64 2.6.20-krg SMP with Kerrighed 2.3.0 [[BR]]
+Env: '''Debian 4.0 amd64 2.6.20-krg SMP with Kerrighed 2.3.0''' [[BR]]
 Step1: rider@hd05:~$ wget http://www.hpcc.jp/Omni/ftp/Omni/Omni-1.6.tar.gz  [[BR]]
 Step2: rider@hd05:~$ tar zxvf Omni-1.6.tar.gz[[BR]]
@@ -9 +9 @@
 Step6: rider@hd05:~$ export OMPC_NUM_PROCS=16 (Kerrighed_machines: node0~node4) [[BR]]
 Step7: rider@hd05:~$ export OMPC_BIND_PROCS=true [[BR]]
+
+Directions:
+
+-- The environment variable OMPC_NUM_PROCS specifies the number of
+threads to execute the program. For example, you want to use 4 threads,
+
+        setenv OMPC_NUM_PROCS 4
+
+ -- If the environment variable OMPC_NUM_PROCS is not set, check the
+number of physical processors in your platform. The same number of
+threads are created as the number of physical processor. 
+In Linux and Solaris platforms, the runtime system checks the number
+of processors. Otherwise, the current version uses a compile-time
+constant N_PROC_DEFALUT (currently 4) in "ompclib.h" as the number of threads.
+[[BR]]
+ -- If the environment variable OMP_NUM_THREADS is set and its value
+is greater than the number of threads described above, the value of 
+OMP_NUM_THREADS is used as the max number of threads.
+
 == Intel C++ Compiler Installation ==
 Step1: Download the Intel C++ Compiler from http://www.intel.com/cd/software/products/asmo-na/eng/340679.htm  [[BR]]