I don't know the real answer but I suspect it has to do with modern file-systems being very well tuned, with fancy memory caches that are actually better than old-school SysV shared memory. For me it doesn't really matter why it's slow unless I expect to fix it. Fixing SysV shared-memory would a complete waste of time, I think!

-sam

In reply to Re^4: Better "IPC" method than BDB? by samtregar
in thread Better "IPC" method than BDB? by bennymack

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