Mohid OpenMP - Revision history

Francisco: /* Windows */

2011-04-28T17:26:15Z

‎Windows

2010-12-22T14:14:37Z

‎How to pre-set the number of threads to use

2010-12-22T14:13:08Z

2010-09-13T19:27:02Z

‎Benchmarking formula

2010-09-13T19:26:14Z

‎Atmospheric freshwater cylinder 64bits dual-core 2 threads

2010-09-13T19:12:07Z

2010-09-13T19:06:33Z

2010-09-13T18:33:03Z

2010-09-13T18:32:16Z

‎PCOMS 20100801 quad-core 4 threads

2010-09-13T18:32:02Z

@@ Line 3: / Line 3: @@
 ==How to pre-set the number of threads to use==
 ===Windows===
-Just before running mohid type
+In the Module model it has to be added the following keyword
-  exe> set OMP_NUM_THREADS=N
 where N is the number of threads you want to use. It is recommend that N be equal to, or less than, the number of physical cores of your machine. (For example, in a quad core machine, like the intel i7 970, N = 4 gives the best performance.)

@@ Line 5: / Line 5: @@
 Just before running mohid type
   exe> set OMP_NUM_THREADS=N
-where N is the number of threads you want to use. It is recommend that N be equal to, or less than, the number of physical cores of your machine.
+where N is the number of threads you want to use. It is recommend that N be equal to, or less than, the number of physical cores of your machine. (For example, in a quad core machine, like the intel i7 970, N = 4 gives the best performance.)
 The you can launch MOHIDWater

← Older revision		Revision as of 14:13, 22 December 2010
Line 1:		Line 1:
	This wiki entry is about the project to parallelize Mohid with [[Parallel processing\|OpenMP directives]].		This wiki entry is about the project to parallelize Mohid with [[Parallel processing\|OpenMP directives]].
		+
		+	==How to pre-set the number of threads to use==
		+	===Windows===
		+	Just before running mohid type
		+	exe> set OMP_NUM_THREADS=N
		+	where N is the number of threads you want to use. It is recommend that N be equal to, or less than, the number of physical cores of your machine.
		+
		+	The you can launch MOHIDWater
		+	exe> MohidWater.exe

	==Official benchmarking==		==Official benchmarking==

@@ Line 7: / Line 7: @@
 ===Benchmarking formula===
 The benchmark formula is:
-  Speedup = A / B, where A is time with openmp and B is time without openmp.
+  Speedup = A / B, where A is time with openmp and B is time without openmp. If Speedup < 1, then speed is up; if Speedup > 1, then speed is down.
 ===Official results===

@@ Line 20: / Line 20: @@
 Obs: the Module Life single loop was successfully parallelized.
-====Atmospheric freshwater cylinder 64bits dual-core 2 threads====
 ==Other links==

@@ Line 12: / Line 12: @@
 ====PCOMS 20100801 quad-core 4 threads====
 Module        SubRoutine    Time w/o    Time w    Speed-up
-  ModuleModel   RunOneModel  727.679     193.4     '''3.76'''
+  ModuleModel   RunOneModel  727.679     193.4     0.87
 ====Azores 20100801 six-core 12 threads====
 Module        SubRoutine    Time w/o    Time w    Speed-up
-  ModuleModel   RunOneModel  8792.656	7627.37   1.15
+  ModuleModel   RunOneModel  8792.656	7627.37   0.27
 Obs: the Module Life single loop was successfully parallelized.

← Older revision		Revision as of 18:32, 13 September 2010
Line 1:		Line 1:
	This wiki entry is about the project to parallelize Mohid with [[Parallel processing\|OpenMP directives]].		This wiki entry is about the project to parallelize Mohid with [[Parallel processing\|OpenMP directives]].
		+
		+	==Official benchmarking==
		+	Benchmarks must be identified with the processor type (intel, amd), the architecture (32bit, 64bit), the number of cores (#2, #4) and the number of threads (#4, #8, ...). The simulation must be given an id such as PCOMS, PCOMS-bio, Azores, etc...
		+	The benchmarks must be performed with the data contained in the MOHID Outwatches logs, once with the Model run without openmp, and once with the model run with openmp.
		+
		+	===Benchmarking formula===
		+	The benchmark formula is:
		+	If A > B, then speedup = A / B (gain) or else speedup = - B / A (loss).
		+
		+	===Official results===
		+	====PCOMS 20100801 quad-core 4 threads====
		+	Module SubRoutine Time w/o Time w Speed-up
		+	ModuleModel RunOneModel 727.679 193.4 3.76
		+
		+	====Azores 20100801 six-core 12 threads====
		+	Module SubRoutine Time w/o Time w Speed-up
		+	ModuleModel RunOneModel 8792.656 7627.37 1.15
		+
		+	====Atmospheric freshwater cylinder 64bits dual-core 2 threads====
		+	Module SubRoutine Time w/o Time w Speed-up
		+	ModuleModel RunOneModel 8792.656 7627.37 1.15
		+
		+	Obs: the Module Life single loop was successfully parallelized.

	==Other links==		==Other links==