Re: Excessive PostmasterIsAlive calls slow down WAL redo

On April 9, 2018 6:31:07 PM PDT, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
>Andres Freund wrote:
>
>> Another approach, that's simpler to implement, is to simply have a
>> second selfpipe, just for WL_POSTMASTER_DEATH.
>
>Would it work to use this second pipe, to which each child writes a
>byte
>that postmaster never reads, and then rely on SIGPIPE when postmaster
>dies?  Then we never need to do a syscall.

I'm not following, could you expand on what you're suggesting?  Note that you do not get SIGPIPE for already buffered
writes. Which syscall can we avoid? 

Andres
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