All tests on r45 or r70

Aug 3 2009

First version of fasta. Translation of fasta.c, fetched from
	http://shootout.alioth.debian.org/u32q/benchmark.php?test=fasta&lang=gpp&id=4

fasta -n 25000000
	gcc -O2 fasta.c	5.98u 0.00s 6.01r
	gccgo -O2 fasta.go	8.82u 0.02s 8.85r
	6g fasta.go	13.50u 0.02s 13.53r
	6g -B fata.go	12.99u 0.02s 13.02r

Aug 4 2009
[added timing.sh]

# myrandom:
#   hand-written optimization of integer division
#   use int32->float conversion
fasta -n 25000000
	# probably I/O library inefficiencies
	gcc -O2 fasta.c	5.99u 0.00s 6.00r 
	gccgo -O2 fasta.go	8.82u 0.02s 8.85r
	gc fasta	10.70u 0.00s 10.77r
	gc_B fasta	10.09u 0.03s 10.12r

reverse-complement < output-of-fasta-25000000
	# we don't know - memory cache behavior?
	gcc -O2 reverse-complement.c	2.04u 0.94s 10.54r
	gccgo -O2 reverse-complement.go	6.54u 0.63s 7.17r
	gc reverse-complement	6.55u 0.70s 7.26r
	gc_B reverse-complement	6.32u 0.70s 7.10r

nbody 50000000
	# math.Sqrt needs to be in assembly; inlining is probably the other 50%
	gcc -O2 nbody.c	21.61u 0.01s 24.80r
	gccgo -O2 nbody.go	118.55u 0.02s 120.32r
	gc nbody	100.84u 0.00s 100.85r
	gc_B nbody	103.33u 0.00s 103.39r
[
hacked Sqrt in assembler
	gc nbody	31.97u 0.00s 32.01r
]

binary-tree 15 # too slow to use 20
	# memory allocation and garbage collection
	gcc -O2 binary-tree.c -lm	0.86u 0.00s 0.87r
	gccgo -O2 binary-tree.go	1.69u 0.46s 2.15r
	gccgo -O2 binary-tree-freelist.go	8.48u 0.00s 8.48r
	gc binary-tree	9.60u 0.01s 9.62r
	gc binary-tree-freelist	0.48u 0.01s 0.50r

August 5, 2009

fannkuch 12
	# bounds checking is half the difference
	# rest might be registerization
	gcc -O2 fannkuch.c	60.09u 0.01s 60.32r
	gccgo -O2 fannkuch.go	64.89u 0.00s 64.92r
	gc fannkuch	124.59u 0.00s 124.67r
	gc_B fannkuch	91.14u 0.00s 91.16r

regex-dna 100000
	# regexp code is slow on trivial regexp
	gcc -O2 regex-dna.c -lpcre	0.92u 0.00s 0.99r
	gc regexp-dna	26.94u 0.18s 28.75r
	gc_B regexp-dna	26.51u 0.09s 26.75r

spectral-norm 5500
	gcc -O2 spectral-norm.c -lm	11.54u 0.00s 11.55r
	gccgo -O2 spectral-norm.go	12.20u 0.00s 12.23r
	gc spectral-norm	50.23u 0.00s 50.36r
	gc_B spectral-norm	49.69u 0.01s 49.83r
	gc spectral-norm-parallel	24.47u 0.03s 11.05r  # has shift >>1 not div /2
	[using >>1 instead of /2 : gc gives 24.33u 0.00s 24.33r]

August 6, 2009

k-nucleotide 5000000
	# string maps are slower than glib string maps
	gcc -O2 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include k-nucleotide.c -lglib-2.0	k-nucleotide.c: 10.72u 0.01s 10.74r
	gccgo -O2 k-nucleotide.go	21.64u 0.83s 22.78r
	gc k-nucleotide	16.08u 0.06s 16.50r
	gc_B k-nucleotide	17.32u 0.02s 17.37r

mandelbrot 5500
	# floating point code generator should use more registers
	gcc -O2 mandelbrot.c	56.13u 0.02s 56.17r
	gccgo -O2 mandelbrot.go	57.49u 0.01s 57.51r
	gc mandelbrot	74.32u 0.00s 74.35r
	gc_B mandelbrot	74.28u 0.01s 74.31r

meteor 16000
	# we don't know
	gcc -O2 meteor-contest.c	0.10u 0.00s 0.10r
	gccgo -O2 meteor-contest.go	0.12u 0.00s 0.14r
	gc meteor-contest	0.24u 0.00s 0.26r
	gc_B meteor-contest	0.23u 0.00s 0.24r

pidigits 10000
	# bignum is slower than gmp
	gcc -O2 pidigits.c -lgmp	2.60u 0.00s 2.62r
	gc pidigits	77.69u 0.14s 78.18r
	gc_B pidigits	74.26u 0.18s 75.41r
	gc_B pidigits	68.48u 0.20s 69.31r   # special case: no bounds checking in bignum

August 7 2009

# New gc does better division by powers of 2.  Significant improvements:

spectral-norm 5500
	# floating point code generator should use more registers; possibly inline evalA
	gcc -O2 spectral-norm.c -lm	11.50u 0.00s 11.50r
	gccgo -O2 spectral-norm.go	12.02u 0.00s 12.02r
	gc spectral-norm	23.98u 0.00s 24.00r	# new time is 0.48 times old time, 52% faster
	gc_B spectral-norm	23.71u 0.01s 23.72r	# ditto
	gc spectral-norm-parallel	24.04u 0.00s 6.26r  # /2 put back.  note: 4x faster (on r70, idle)

k-nucleotide 1000000
	# string maps are slower than glib string maps
	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
	gccgo -O2 k-nucleotide.go	22.73u 0.89s 23.63r
	gc k-nucleotide	15.97u 0.03s 16.04r
	gc_B k-nucleotide	15.86u 0.06s 15.93r	# 8.5% faster, but probably due to weird cache effeccts in previous version

pidigits 10000
	# bignum is slower than gmp
	gcc -O2 pidigits.c -lgmp	2.58u 0.00s 2.58r
	gc pidigits	71.24u 0.04s 71.28r	# 8.5% faster
	gc_B pidigits	71.25u 0.03s 71.29r	# 4% faster

threadring 50000000
	gcc -O2 threadring.c -lpthread	35.51u 160.21s 199.50r
	gccgo -O2 threadring.go	90.33u 459.95s 448.03r
	gc threadring	33.11u 0.00s 33.14r
	GOMAXPROCS=4 gc threadring	114.48u 226.65s 371.59r
	# change wait code to do <-make(chan int) instead of time.Sleep
	gc threadring	28.41u 0.01s 29.35r
	GOMAXPROCS=4 gc threadring	112.59u 232.83s 384.72r
	
chameneos 6000000
	gcc -O2 chameneosredux.c -lpthread	18.14u 276.52s 76.93r
	gc chameneosredux	20.19u 0.01s 20.23r