r15461 - /1.3/multi/test_implementation.py -- March 08, 2012 - 12:15

Author: bugman
Date: Thu Mar  8 12:15:15 2012
New Revision: 15461

URL: http://svn.gna.org/viewcvs/relax?rev=15461&view=rev
Log:
Added some documentation about master processors on Linux 2.6 eating 100% of 
one CPU core.


Modified:
    1.3/multi/test_implementation.py

Modified: 1.3/multi/test_implementation.py
URL: 
http://svn.gna.org/viewcvs/relax/1.3/multi/test_implementation.py?rev=15461&r1=15460&r2=15461&view=diff
==============================================================================
--- 1.3/multi/test_implementation.py (original)
+++ 1.3/multi/test_implementation.py Thu Mar  8 12:15:15 2012
@@ -22,6 +22,14 @@
     - Uni-processor:        51.548 seconds 
(51.054+52.224+51.257+51.112+52.093)
     - Mpi4py-processor:     43.185 seconds 
(43.867+41.478+46.209+39.941+44.429)
     - Scaling efficiency:   1.194
+
+
+Linux
+-----
+
+For multi-core systems and late 2.6 Linux kernels, the following as root 
might be required to prevent the master processor from taking 100% of one CPU 
core while waiting for the slaves.
+
+# echo "1" > /proc/sys/kernel/sched_compat_yield
 """
 
 # Python module imports.
@@ -43,7 +51,7 @@
 
 # Module variables.
 PROFILE = True
-MULTI = False
+MULTI = True
 if MULTI:
     FABRIC = 'mpi4py'
     PROCESSOR_NUM = 2