Re: Re[2]: [HACKERS] Re: [PATCHES] A patch for xlog.c

[Tom Lane]

>> the only problem is because if we need to tune Postermaster to use
>> large buffer while system havn't so many SYSV shared memory, in many
>> systemes, we need to recompile OS kernel, this is a small problem to install
>> PGSQL to product environment.

Of course, if you haven't got mmap(), a recompile won't help ...

I'd be somewhat more enthusiastic about mmap if I thought we could
abandon the SysV shmem support completely, but I don't foresee that
happening for a long while yet.

                        regards, tom lane