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timing updates after 6g change for efficient division by powers of two
R=rsc DELTA=25 (23 added, 0 deleted, 2 changed) OCL=32873 CL=32875
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@ -47,7 +47,7 @@ var n = flag.Int("n", 2000, "count")
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var nCPU = flag.Int("ncpu", 4, "number of cpus")
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func evalA(i, j int) float64 {
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return 1 / float64(((i + j)*(i + j + 1)>>1+ i + 1));
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return 1 / float64(((i + j)*(i + j + 1)/2 + i + 1));
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}
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type Vec []float64
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@ -92,3 +92,26 @@ pidigits 10000
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gc pidigits 77.69u 0.14s 78.18r
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gc_B pidigits 74.26u 0.18s 75.41r
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gc_B pidigits 68.48u 0.20s 69.31r # special case: no bounds checking in bignum
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August 7 2009
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# New gc does better division by powers of 2. Significant improvements:
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spectral-norm 5500
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gcc -O2 spectral-norm.c -lm 11.50u 0.00s 11.50r
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gccgo -O2 spectral-norm.go 12.02u 0.00s 12.02r
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gc spectral-norm 23.98u 0.00s 24.00r # new time is 0.48 times old time, 52% faster
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gc_B spectral-norm 23.71u 0.01s 23.72r # ditto
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gc spectral-norm-parallel 24.04u 0.00s 6.26r # /2 put back. note: 4x faster (on r70, idle)
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k-nucleotide 1000000
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gcc -O2 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include k-nucleotide.c -lglib-2.0 10.82u 0.04s 10.87r
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gccgo -O2 k-nucleotide.go 22.73u 0.89s 23.63r
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gc k-nucleotide 15.97u 0.03s 16.04r
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gc_B k-nucleotide 15.86u 0.06s 15.93r # 8.5% faster, but probably due to weird cache effeccts in previous version
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pidigits 10000
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gcc -O2 pidigits.c -lgmp 2.58u 0.00s 2.58r
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gc pidigits 71.24u 0.04s 71.28r # 8.5% faster
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gc_B pidigits 71.25u 0.03s 71.29r # 4% faster
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@ -121,7 +121,7 @@ pidigits() {
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case $# in
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0)
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run="fasta revcom nbody binarytree fannkuch regexdna spectralnorm knucleotide mandelbrot meteor pidigits"
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run="fasta revcomp nbody binarytree fannkuch regexdna spectralnorm knucleotide mandelbrot meteor pidigits"
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;;
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*)
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run=$*
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