On Thu, Dec 18, 2014 at 7:31 PM, Rahila Syed <rahilasye...@gmail.com> wrote:
>>Isn't it better to allocate the memory for compression_scratch in
>>like hdr_scratch?
> I think making compression_scratch a statically allocated global variable
> is the result of  following discussion earlier,
> http://www.postgresql.org/message-id/ca+tgmoaznbuwnls4bpwyqgqteeznoavy7kwdbm0a2-tbarn...@mail.gmail.com
Yep, in this case the OS does not request this memory as long as it is
not touched, like when wal_compression is off all the time in the
backend. Robert mentioned that upthread.

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