Correction: the "x" commands reports total CPU time, whereas what is relevant is the WALL time 1 Job 1 Thread 140 Secs 2 Jobs 1 Thread Each 150 Secs Each (75 Secs/Job) 1 Job 2 Threads 88 Secs 2 Jobs 2 Threads Each 112 Secs (61 Secs/Job)
On Jan 6, 2008 8:17 AM, Laurence Marks <L-marks at northwestern.edu> wrote: > Xeon 3210 2.13GHz Quad Core (2x2Duo Core) > ifort 10.1.008 cmkl 10.0.1.014 > FOPT = -FR -mp1 -w -prec_div -pc80 -pad -ip -DINTEL_VML -xT > -mtune=core2 -O3 -thread -fminshared > LDFLAGS = $(FOPT) -L/opt/intel/mkl/10.0.1.014/lib/em64t -static > R_LIBS = -lmkl_lapack -lguide -pthread > 1 Job 1 Thread 140 Secs (OMP_NUM_THREADS=1) > 1 Job 2 Threads 168 Secs (OMP_NUM_THREADS=2) > 2 Jobs 1 Thread each 150 Secs each, > > Comments: > 1) It looks like the threading is not right as yet, and/or something > else; I cannot find a way to get improved performance with threads. If > anyone has suggestions please respond directly to me. > 2) The numbers suggest that this quad core is really behaving like > 2x2Duo Cores, i.e. a 2 CPU Xeon which is perhaps not surprising. > > -- > Laurence Marks > Department of Materials Science and Engineering > MSE Rm 2036 Cook Hall > 2220 N Campus Drive > Northwestern University > Evanston, IL 60208, USA > Tel: (847) 491-3996 Fax: (847) 491-7820 > email: L-marks at northwestern dot edu > Web: www.numis.northwestern.edu > Commission on Electron Diffraction of IUCR > www.numis.northwestern.edu/IUCR_CED > -- Laurence Marks Department of Materials Science and Engineering MSE Rm 2036 Cook Hall 2220 N Campus Drive Northwestern University Evanston, IL 60208, USA Tel: (847) 491-3996 Fax: (847) 491-7820 email: L-marks at northwestern dot edu Web: www.numis.northwestern.edu Commission on Electron Diffraction of IUCR www.numis.northwestern.edu/IUCR_CED