Holy cow, that's a lot of code for $counter++! I hate SysV IPC so, so much.
Is it really so fast though? MySQL is storing that data on disk and it's only 4x slower! Is disk 4x slower than memory? No, it's much, much slower. SysV. IPC. Sucks.
If you feel like running more benchmarks for me, change the MySQL one to use a MEMORY table. Then at least you won't have disk writes dragging MySQL down.
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