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 >>InitXLogInsert() >>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. -- Michael
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