Re[4]: Re: [PATCHES] A patch for xlog.c

Hello Tom,

Tuesday, February 27, 2001, 12:45:18 PM, you wrote:

TL> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
>> I know it is easy for you, but the number of reports and problems we
>> hear about shows it is an issue for some.

TL> We hear some reports, but not a lot. We have no idea whatever what
TL> problems might ensue if we used mmap instead. I'm dubious that SysV
TL> shmem creates enough problems to justify replacing it with a solution
TL> of essentially unknown portability characteristics...

TL> regards, tom lane

could anyone investigate mmap() in many modern UNIX systems to prove that
mmap() is so un-portable?

it seems mmap() is a portable problem like you said, but I think SYSV
shmem for PGSQL is a installation problem. you push some difficults to
end user, and take easy taskes for yourself.

Xu Yifeng