Hi folks!
Happy New Year and best wishes!
Recently I compared Blitz with Pooma II performance.
At first glance Blitz outperforms Pooma II greatly, Blitz' performance
is about the same as for C arrays version, but Pooma II
performance is about ten times (one order) worser.
Maybe something wrong have been done by me?
It goes without saying that Blitz (thanks to author) has excellent
implementation, but the difference is impressive.
About compiler used for testing:
EGCS snapshot 1999-01-03,
Blitz snapshot 1998-09-03,
PoomaII distribution from http://www.acl.lanl.gov/pooma/
Hardware: UltraSparcIII with 768MB RAM
About test results: below are results for SimpleArray benchmark
in PoomaII distribution.
At first this benchmark build unmodified with
these swithes:
/usr/bin/time eg++ -c /home/spike/pooma-2.0/benchmarks/SimpleArray/atest.cpp \
-o /home/spike/pooma-2.0/benchmarks/SimpleArray/SOLARISEGCS/atest.o \
-ftemplate-depth-40 \
-DNOPAssert -DNOCTAssert -O3 -funroll-loops -fstrict-aliasing \
-I/home/spike/pooma-2.0/src \
-I/home/spike/pooma-2.0/lib/SOLARISEGCS
below are results:
./atest Benchmark
-----------------
Running C w/o restrict Implementation:
N = 10...
Correctness test value for N = 10 is 110.
N = 21...
Correctness test value for N = 21 is 231.
N = 46...
Correctness test value for N = 46 is 506.
N = 100...
Correctness test value for N = 100 is 1100.
N = 215...
Correctness test value for N = 215 is 2365.
N = 464...
Correctness test value for N = 464 is 5104.
N = 1000...
Correctness test value for N = 1000 is 11000.
Running C w/ restrict Implementation:
N = 10...
Correctness test value for N = 10 is 110.
N = 21...
Correctness test value for N = 21 is 231.
N = 46...
Correctness test value for N = 46 is 506.
N = 100...
Correctness test value for N = 100 is 1100.
N = 215...
Correctness test value for N = 215 is 2365.
N = 464...
Correctness test value for N = 464 is 5104.
N = 1000...
Correctness test value for N = 1000 is 11000.
Running CppTran Implementation:
N = 10...
Correctness test value for N = 10 is 110.
N = 21...
Correctness test value for N = 21 is 231.
N = 46...
Correctness test value for N = 46 is 506.
N = 100...
Correctness test value for N = 100 is 1100.
N = 215...
Correctness test value for N = 215 is 2365.
N = 464...
Correctness test value for N = 464 is 5104.
N = 1000...
Correctness test value for N = 1000 is 11000.
Running PoomaII Implementation:
N = 10...
Correctness test value for N = 10 is 110.
N = 21...
Correctness test value for N = 21 is 231.
N = 46...
Correctness test value for N = 46 is 506.
N = 100...
Correctness test value for N = 100 is 1100.
N = 215...
Correctness test value for N = 215 is 2365.
N = 464...
Correctness test value for N = 464 is 5104.
N = 1000...
Correctness test value for N = 1000 is 11000.
C C
N w/o restrict w/ restrict CppTran PoomaII
10 35.24 52.64 6.754 4.881
21 36.64 60.19 9.167 5.915
46 34.53 36.24 8.36 6.723
100 39.9 32.66 8.12 5.87
215 39.66 35.78 7.812 5.556
464 18.27 14.12 6.437 5.082
1000 14.56 12.79 5.769 4.491
And then PoomaII Array<...> class was substituted (to avoid name clashes
not added but substituted) by Blitz Array<...> class, e.g. Blitz Array<...>
was ported into PoomaII Benchmark class framework and built with the same
switches.
Here are the results:
./atest Benchmark
-----------------
Running C w/o restrict Implementation:
N = 10...
Correctness test value for N = 10 is 110.
N = 21...
Correctness test value for N = 21 is 231.
N = 46...
Correctness test value for N = 46 is 506.
N = 100...
Correctness test value for N = 100 is 1100.
N = 215...
Correctness test value for N = 215 is 2365.
N = 464...
Correctness test value for N = 464 is 5104.
N = 1000...
Correctness test value for N = 1000 is 11000.
Running C w/ restrict Implementation:
N = 10...
Correctness test value for N = 10 is 110.
N = 21...
Correctness test value for N = 21 is 231.
N = 46...
Correctness test value for N = 46 is 506.
N = 100...
Correctness test value for N = 100 is 1100.
N = 215...
Correctness test value for N = 215 is 2365.
N = 464...
Correctness test value for N = 464 is 5104.
N = 1000...
Correctness test value for N = 1000 is 11000.
Running Blitz Implementation:
N = 10...
Correctness test value for N = 10 is 110.
N = 21...
Correctness test value for N = 21 is 231.
N = 46...
Correctness test value for N = 46 is 506.
N = 100...
Correctness test value for N = 100 is 1100.
N = 215...
Correctness test value for N = 215 is 2365.
N = 464...
Correctness test value for N = 464 is 5104.
N = 1000...
Correctness test value for N = 1000 is 11000.
C C
N w/o restrict w/ restrict Blitz
10 37.45 56.24 30.39
21 44.45 50.24 42.24
46 30.21 35.47 31.65
100 34.14 33.64 34.22
215 38.6 35.82 41.23
464 15.3 16.41 17.69
1000 15.19 15.34 13.85
What do you think about this?
Best regards.
Alexander.
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