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add chunksize cheat-sheet

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ed
2025-01-10 18:24:40 +00:00
parent fcf32a935b
commit f5753ba720
5 changed files with 95 additions and 1 deletions
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docs/notes.sh
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@@ -259,6 +259,12 @@ for d in /usr /var; do find $d -type f -size +30M 2>/dev/null; done | while IFS=
for f in {0..255}; do echo $f; truncate -s 256M $f; b1=$(printf '%02x' $f); for o in {0..255}; do b2=$(printf '%02x' $o); printf "\x$b1\x$b2" | dd of=$f bs=2 seek=$((o*1024*1024)) conv=notrunc 2>/dev/null; done; done
# create 6.06G file with 16 bytes of unique data at start+end of each 32M chunk
sz=6509559808; truncate -s $sz f; csz=33554432; sz=$((sz/16)); step=$((csz/16)); ofs=0; while [ $ofs -lt $sz ]; do dd if=/dev/urandom of=f bs=16 count=2 seek=$ofs conv=notrunc iflag=fullblock; [ $ofs = 0 ] && ofs=$((ofs+step-1)) || ofs=$((ofs+step)); done
# same but for chunksizes 16M (3.1G), 24M (4.1G), 48M (128.1G)
sz=3321225472; csz=16777216;
sz=4394967296; csz=25165824;
sz=6509559808; csz=33554432;
sz=138438953472; csz=50331648;
f=csz-$csz; truncate -s $sz $f; sz=$((sz/16)); step=$((csz/16)); ofs=0; while [ $ofs -lt $sz ]; do dd if=/dev/urandom of=$f bs=16 count=2 seek=$ofs conv=notrunc iflag=fullblock; [ $ofs = 0 ] && ofs=$((ofs+step-1)) || ofs=$((ofs+step)); done
# py2 on osx
brew install python@2