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cd $HOME/local-boost
wget https://boostorg.jfrog.io/artifactory/main/release/1.81.0/source/
+boost_1_81_0_rc1.tar.gz.json
wget https://boostorg.jfrog.io/artifactory/main/release/1.81.0/source/
+boost_1_81_0_rc1.tar.gz
tar -xzf boost_1_81_0_rc1.tar.gz

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clang++ -o llil5vec-tbb -std=c++20 -Wall -O3 -I "$HOME/llil/cmdlinux/f
+ast_io/include" -I "$HOME/local-boost/boost_1_81_0" -I "$HOME/local-o
+neapi-tbb/oneapi-tbb-2021.7.0/include" -L "$HOME/local-oneapi-tbb/one
+api-tbb-2021.7.0/lib" llil5vec-tbb.cpp -l tbb

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block_indirect_sort.hpp:274:23: warning: implicit capture of ‘this’ vi
+a ‘[=]’ is deprecated in C++20 [-Wdeprecated]

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$ NUM_THREADS=6 ./llil4vec-tbb big1.txt big2.txt big3.txt >f.tmp
llil4vec-tbb (fixed string length=6) start
...
emplace set sort    time : 0.764016 secs
write stdout        time : 0.51597 secs
total               time : 1.95691 secs

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$ NUM_THREADS=6 ./llil5vec-tbb big1.txt big2.txt big3.txt >big-5vec.tm
+p
llil5vec-tbb (fixed string length=6) start
...
total               time : 1.4179 secs

$ diff big-5vec.tmp big-3vec.tmp

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$ NUM_THREADS=6 ./llil4vec2 big1.txt big2.txt big3.txt >f.tmp
llil4vec2 (fixed string length=6) start
...
vector stable sort  time :    0.197 secs
write stdout        time :    0.322 secs
total               time :    1.219 secs

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$ NUM_THREADS=6 ./llil4vec2 big1.txt big2.txt big3.txt >f.tmp
llil4vec2 (fixed string length=6) start
...
vector stable sort  time :    0.194 secs
write stdout        time :    0.329 secs
total               time :    1.192 secs

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$ NUM_THREADS=6 ./llil4vec2 big1.txt big2.txt big3.txt >f.tmp
llil4vec2 (fixed string length=6) use memcmp start
...
vector stable sort  time :    0.199 secs
write stdout        time :    0.316 secs
total               time :    1.120 secs

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$ LD_PRELOAD=/usr/local/lib/libmimalloc.so NUM_THREADS=6 ./llil4vec-ne
+w big1.txt big2.txt big3.txt >f.tmp
llil4vec (fixed string length=6) start
...
write stdout           0.300 secs
total time             0.986 secs
$ cmp f.tmp big-3vec.tmp

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$ NUM_THREADS=6 ./llil4map big1.txt big2.txt big3.txt >f.tmp
llil4map start
...
vector stable sort  time : 0.76791 secs
write stdout        time : 0.382316 secs
total               time : 3.5832 secs

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$ NUM_THREADS=6 LD_LIBRARY_PATH=/usr/local/lib ./llil4judy big1.txt bi
+g2.txt big3.txt >f.tmp
llil4judy (fixed string length=6) start
...
write stdout           0.526 secs
total time             3.810 secs
$ cmp f.tmp big-3vec.tmp

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$ NUM_THREADS=6 ./llil4vec2 big?.txt big?.txt big?.txt >f4vec.tmp
llil4vec2 (fixed string length=6) start
...
-rw-r--r--  31636800 Feb  1 09:33 big4.txt
-rw-r--r--  31636800 Feb  1 09:31 big5.txt
-rw-r--r--  31636800 Feb  1 09:31 big6.txt

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Update: a later version with improved get_properties():
$ NUM_THREADS=6 ./llil4vec2 big?.txt big?.txt big?.txt big?.txt big?.t
+xt big?.txt >f4vec.tmp
...
write stdout        time : 2.55906 secs
total               time : 17.198 secs
$ diff f4map.tmp f4vec.tmp

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// llil5vec-tbb.cpp
// Based on llil4vec-tbb.cpp in https://perlmonks.com/?node_id=1114968
+7
...

   return 0;
}

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// llil4vec2.cpp
// See also: perlmonks.com, node_id=11149754
...

   return 0;
}