Re[4]: Re: [PATCHES] A patch for xlog.c - Mailing list pgsql-hackers

From Xu Yifeng
Subject Re[4]: Re: [PATCHES] A patch for xlog.c
Date
Msg-id 12317578146.20010227134544@telekbird.com.cn
Whole thread Raw
In response to Re: Re[2]: Re: [PATCHES] A patch for xlog.c  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re[4]: Re: [PATCHES] A patch for xlog.c
List pgsql-hackers
Hello Tom,

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

TL> Bruce Momjian <pgman@candle.pha.pa.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




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