Prebuilt binary with PGO here about efficient-compression-tool HOT 8 OPEN

Benchmark 1: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      3.139 s ±  0.014 s    [User: 3.102 s, System: 0.031 s]
  Range (min … max):    3.120 s …  3.159 s    5 runs
 
Benchmark 2: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_clevert /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      2.911 s ±  0.013 s    [User: 2.878 s, System: 0.026 s]
  Range (min … max):    2.895 s …  2.926 s    5 runs
 
Benchmark 3: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v3 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      2.865 s ±  0.005 s    [User: 2.828 s, System: 0.030 s]
  Range (min … max):    2.858 s …  2.871 s    5 runs
 
Benchmark 4: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v4 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      2.880 s ±  0.002 s    [User: 2.843 s, System: 0.030 s]
  Range (min … max):    2.878 s …  2.882 s    5 runs
 
Summary
  mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v3 /tmp/tst; rm -rf /tmp/tst ran
    1.01 ± 0.00 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v4 /tmp/tst; rm -rf /tmp/tst
    1.02 ± 0.01 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_clevert /tmp/tst; rm -rf /tmp/tst
    1.10 ± 0.01 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect /tmp/tst; rm -rf /tmp/tst

Benchmark 1: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect -5 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      6.439 s ±  0.096 s    [User: 6.389 s, System: 0.037 s]
  Range (min … max):    6.334 s …  6.548 s    5 runs
 
Benchmark 2: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_clevert -5 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      5.213 s ±  0.017 s    [User: 5.164 s, System: 0.037 s]
  Range (min … max):    5.193 s …  5.230 s    5 runs
 
Benchmark 3: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v3 -5 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      4.358 s ±  0.016 s    [User: 4.307 s, System: 0.040 s]
  Range (min … max):    4.340 s …  4.379 s    5 runs
 
Benchmark 4: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v4 -5 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):      4.258 s ±  0.010 s    [User: 4.208 s, System: 0.040 s]
  Range (min … max):    4.251 s …  4.276 s    5 runs
 
Summary
  mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v4 -5 /tmp/tst; rm -rf /tmp/tst ran
    1.02 ± 0.00 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v3 -5 /tmp/tst; rm -rf /tmp/tst
    1.22 ± 0.00 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_clevert -5 /tmp/tst; rm -rf /tmp/tst
    1.51 ± 0.02 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect -5 /tmp/tst; rm -rf /tmp/tst

Benchmark 1: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect -9 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):     65.767 s ±  0.164 s    [User: 65.578 s, System: 0.052 s]
  Range (min … max):   65.602 s … 66.035 s    5 runs
 
Benchmark 2: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_clevert -9 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):     43.676 s ±  0.030 s    [User: 43.521 s, System: 0.052 s]
  Range (min … max):   43.637 s … 43.711 s    5 runs
 
Benchmark 3: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v3 -9 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):     27.658 s ±  0.162 s    [User: 27.531 s, System: 0.056 s]
  Range (min … max):   27.488 s … 27.927 s    5 runs
 
Benchmark 4: mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v4 -9 /tmp/tst; rm -rf /tmp/tst
  Time (mean ± σ):     25.154 s ±  0.079 s    [User: 25.034 s, System: 0.054 s]
  Range (min … max):   25.058 s … 25.256 s    5 runs
 
Summary
  mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v4 -9 /tmp/tst; rm -rf /tmp/tst ran
    1.10 ± 0.01 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_v3 -9 /tmp/tst; rm -rf /tmp/tst
    1.74 ± 0.01 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect_clevert -9 /tmp/tst; rm -rf /tmp/tst
    2.61 ± 0.01 times faster than mkdir -p /tmp/tst; cp *.png /tmp/tst/; ./ect -9 /tmp/tst; rm -rf /tmp/tst