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The Go programming language
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The original index/suffixarray used 32-bit ints on 64-bit machines, because that's what 'int' meant in Go at the time. When we changed the meaning of int, that doubled the space overhead of suffix arrays for all uses, even though the vast majority of them describe less than 2 GB of text. The space overhead of a suffix array compared to the text is not insignificant: there's a big difference for many uses between 4X and 8X. This CL adjusts names in qsufsort.go so that a global search and replace s/32/64/g produces a working 64-bit implementation, and then it modifies suffixarray.go to choose between the 32-bit and 64-bit implementation as appropriate depending on the input size. The 64-bit implementation is generated by 'go generate'. This CL also restructures the benchmarks, to test different input sizes, different input texts, and 32-bit vs 64-bit. The serialized form uses varint-encoded numbers and is unchanged, so on-disk suffix arrays written by older versions of Go will be readable by this version, and vice versa. The 32-bit version runs a up to 17% faster than the 64-bit version on real inputs, but more importantly it uses 50% less memory. I have a followup CL that also implements a faster algorithm on top of these improvements, but these are a good first step. name 64-bit speed 32-bit speed delta New/text=opticks/size=100K/bits=*-12 4.44MB/s ± 0% 4.64MB/s ± 0% +4.41% (p=0.008 n=5+5) New/text=opticks/size=500K/bits=*-12 3.70MB/s ± 1% 3.82MB/s ± 0% +3.30% (p=0.008 n=5+5) New/text=go/size=100K/bits=*-12 4.40MB/s ± 0% 4.61MB/s ± 0% +4.82% (p=0.008 n=5+5) New/text=go/size=500K/bits=*-12 3.66MB/s ± 0% 3.77MB/s ± 0% +3.01% (p=0.016 n=4+5) New/text=go/size=1M/bits=*-12 3.29MB/s ± 0% 3.55MB/s ± 0% +7.90% (p=0.016 n=5+4) New/text=go/size=5M/bits=*-12 2.25MB/s ± 1% 2.65MB/s ± 0% +17.81% (p=0.008 n=5+5) New/text=go/size=10M/bits=*-12 1.82MB/s ± 0% 2.09MB/s ± 1% +14.36% (p=0.008 n=5+5) New/text=go/size=50M/bits=*-12 1.35MB/s ± 0% 1.51MB/s ± 1% +12.33% (p=0.008 n=5+5) New/text=zero/size=100K/bits=*-12 3.42MB/s ± 0% 3.32MB/s ± 0% -2.74% (p=0.000 n=5+4) New/text=zero/size=500K/bits=*-12 3.00MB/s ± 1% 2.97MB/s ± 0% -1.13% (p=0.016 n=5+4) New/text=zero/size=1M/bits=*-12 2.81MB/s ± 0% 2.78MB/s ± 2% ~ (p=0.167 n=5+5) New/text=zero/size=5M/bits=*-12 2.46MB/s ± 0% 2.53MB/s ± 0% +3.18% (p=0.008 n=5+5) New/text=zero/size=10M/bits=*-12 2.35MB/s ± 0% 2.42MB/s ± 0% +2.98% (p=0.016 n=4+5) New/text=zero/size=50M/bits=*-12 2.12MB/s ± 0% 2.18MB/s ± 0% +3.02% (p=0.008 n=5+5) New/text=rand/size=100K/bits=*-12 6.98MB/s ± 0% 7.22MB/s ± 0% +3.38% (p=0.016 n=4+5) New/text=rand/size=500K/bits=*-12 5.53MB/s ± 0% 5.64MB/s ± 0% +1.92% (p=0.008 n=5+5) New/text=rand/size=1M/bits=*-12 4.62MB/s ± 1% 5.06MB/s ± 0% +9.61% (p=0.008 n=5+5) New/text=rand/size=5M/bits=*-12 3.09MB/s ± 0% 3.43MB/s ± 0% +10.94% (p=0.016 n=4+5) New/text=rand/size=10M/bits=*-12 2.68MB/s ± 0% 2.95MB/s ± 0% +10.39% (p=0.008 n=5+5) New/text=rand/size=50M/bits=*-12 1.92MB/s ± 0% 2.06MB/s ± 1% +7.41% (p=0.008 n=5+5) SaveRestore/bits=*-12 243MB/s ± 1% 259MB/s ± 0% +6.68% (p=0.000 n=9+10) name 64-bit alloc/op 32-bit alloc/op delta New/text=opticks/size=100K/bits=*-12 1.62MB ± 0% 0.81MB ± 0% -50.00% (p=0.000 n=5+4) New/text=opticks/size=500K/bits=*-12 8.07MB ± 0% 4.04MB ± 0% -49.89% (p=0.008 n=5+5) New/text=go/size=100K/bits=*-12 1.62MB ± 0% 0.81MB ± 0% -50.00% (p=0.008 n=5+5) New/text=go/size=500K/bits=*-12 8.07MB ± 0% 4.04MB ± 0% -49.89% (p=0.029 n=4+4) New/text=go/size=1M/bits=*-12 16.1MB ± 0% 8.1MB ± 0% -49.95% (p=0.008 n=5+5) New/text=go/size=5M/bits=*-12 80.3MB ± 0% 40.2MB ± 0% ~ (p=0.079 n=4+5) New/text=go/size=10M/bits=*-12 160MB ± 0% 80MB ± 0% -50.00% (p=0.008 n=5+5) New/text=go/size=50M/bits=*-12 805MB ± 0% 402MB ± 0% -50.06% (p=0.029 n=4+4) New/text=zero/size=100K/bits=*-12 3.02MB ± 0% 1.46MB ± 0% ~ (p=0.079 n=4+5) New/text=zero/size=500K/bits=*-12 19.7MB ± 0% 8.7MB ± 0% -55.98% (p=0.008 n=5+5) New/text=zero/size=1M/bits=*-12 39.0MB ± 0% 19.7MB ± 0% -49.60% (p=0.000 n=5+4) New/text=zero/size=5M/bits=*-12 169MB ± 0% 85MB ± 0% -49.46% (p=0.029 n=4+4) New/text=zero/size=10M/bits=*-12 333MB ± 0% 169MB ± 0% -49.43% (p=0.000 n=5+4) New/text=zero/size=50M/bits=*-12 1.63GB ± 0% 0.74GB ± 0% -54.61% (p=0.008 n=5+5) New/text=rand/size=100K/bits=*-12 1.61MB ± 0% 0.81MB ± 0% -50.00% (p=0.000 n=5+4) New/text=rand/size=500K/bits=*-12 8.07MB ± 0% 4.04MB ± 0% -49.89% (p=0.000 n=5+4) New/text=rand/size=1M/bits=*-12 16.1MB ± 0% 8.1MB ± 0% -49.95% (p=0.029 n=4+4) New/text=rand/size=5M/bits=*-12 80.7MB ± 0% 40.3MB ± 0% -50.06% (p=0.008 n=5+5) New/text=rand/size=10M/bits=*-12 161MB ± 0% 81MB ± 0% -50.03% (p=0.008 n=5+5) New/text=rand/size=50M/bits=*-12 806MB ± 0% 403MB ± 0% -50.00% (p=0.016 n=4+5) SaveRestore/bits=*-12 9.47MB ± 0% 5.28MB ± 0% -44.29% (p=0.000 n=9+8) https://perf.golang.org/search?q=upload:20190126.1+|+bits:64+vs+bits:32 Fixes #6816. Change-Id: Ied2fbea519a202ecc43719debcd233344ce38847 Reviewed-on: https://go-review.googlesource.com/c/go/+/174097 Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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The Go Programming Language
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