Alvaro Herrera <alvherre@xxxxxxxxxxxxxx> writes:
> But then I thought, why do we need it to be a file
> at all? Why not use a mmap'ed memory area or something like that, and
> only write it to a file on postmaster shutdown?
Yeah, we definitely need some other technology for this. The difficulty
is in dealing with a highly variably sized chunk of data --- our
existing shmem approach won't work well, and once you get away from that
the old portability question raises its head.
There's also a synchronization issue: how can the stats collector make
updates appear atomic? mmap by itself doesn't solve that AFAIK.
regards, tom lane
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