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devel / comp.lang.awk / making 1.85 billion copies of "27" via gawk in 714 ms

making 1.85 billion copies of "27" via gawk in 714 ms

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Subject: making 1.85 billion copies of "27" via gawk in 714 ms
From: jason.cy.kwan@gmail.com (Kpop 2GM)
Injection-Date: Sat, 28 May 2022 11:35:36 +0000
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by: Kpop 2GM - Sat, 28 May 2022 11:35 UTC

624
97968
7249632
14499264
28998528
57997056
115994112
231988224
463976448
927952896
1855905792

final length for [ "2727272727272727....2727272727272727" ] ::: 3711811584

# gawk profile, created Sat May 28 07:22:45 2022

# BEGIN rule(s)

BEGIN {
1 _ = (_ ^= __ = ____ = _ = 3) (_) (_) _
1 _ = (_ = (_) (_) _) _
1 ___ = "...."
1 --__
2 do {
2 gsub(___, "&" _, _)
2 print "", length(_)
} while (--__)
1 __ = (___) ___
1 (gsub("", (__) (__) (__) __, __)) + (gsub("....", _, __))
1 ____ *= ____
1 _ = ""
9 do {
9 print "", length(__)
9 __ = (__) __
} while (--____)
1 print sprintf("\n\n\t%.*sfinal length for [ \"%.*s....%s\" ] ::: %'.f\n\n", _ = _ < _, ___ = length(__), _ *= _ += _ += ++_, __, substr(__, -(--_ - ___)), ___)
}

( LC_ALL=C gawk -p- -be ; ) 0.20s user 0.46s system 92% cpu 0.714 total

~~~~~~~~~~~~~~~~~~~

Compared to gawk's interpreted scripting, even python3's built in replication feature isn't that much faster :

3711811584

( LC_ALL=C python3 -c 'print(len("27"*1855905792))'; )
0.11s user 0.25s system 98% cpu 0.373 total

~~~~~~~~~~~~~~~~~~~

And for those days you want 15.4 billion copies of "9" using gawk ::

168
7224
13053768
965978832
1931957664
3863915328
7727830656

final length for [ "9999999999999999....9999999999999999" ] ::: 15455661312

# gawk profile, created Sat May 28 07:33:29 2022

# BEGIN rule(s)

BEGIN {
1 _ = (_ *= __ = ____ = _ = 3) (_) (_) _
1 _ = (_ = (_) (_) _) _
1 ___ = "...."
1 __
3 do {
3 gsub(___, "&" _, _)
3 print _____, length(_)
} while (--__)
1 __ = (___) ___
1 (gsub(_____, (__) (__) (__) __, __)) + (gsub("....", _, __))
1 ____ += ! (_ = "")
4 do {
4 print _, length(__)
4 __ = (__) __
} while (--____)
1 print sprintf("\n\n\t%.*sfinal length for [ \"%.*s....%.*s\" ] ::: %'.f\n\n", _ = _ < _, ___ = length(__), _ *= _ += _ += ++_, __, _, substr(__, -(--_ - ___)), ___)
}

( LC_ALL=C gawk -p- -be ; ) 1.43s user 2.07s system 98% cpu 3.559 total

— The 4Chan Teller

Subject	Author
making 1.85 billion copies of "27" via gawk in 714 ms	Kpop 2GM