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Re[3]: Re: [PATCHES] A patch for xlog.c

From: jamexu <jamexu(at)telekbird(dot)com(dot)cn>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re[3]: Re: [PATCHES] A patch for xlog.c
Date: 2001-02-27 03:18:34
Message-ID: 1088747378.20010227111834@telekbird.com.cn (view raw or flat)
Thread:
Lists: pgsql-hackers
Hello The,

Tuesday, February 27, 2001, 11:00:05 AM, you wrote:

THH> On Tue, 27 Feb 2001, jamexu wrote:

>> Hello Tom,
>>
>> Tuesday, February 27, 2001, 12:23:25 AM, you wrote:
>>
>> TL> This looks a lot like exchanging the devil we know (SysV shmem) for a
>> TL> devil we don't know.  Do I need to remind you about, for example, the
>> TL> mmap bugs in early Linux releases?  (I still vividly remember having to
>> TL> abandon mmap on a project a few years back that needed to be portable
>> TL> to Linux.  Perhaps that colors my opinions here.)  I don't think the
>> TL> problems with shmem are sufficiently large to justify venturing into
>> TL> a whole new terra incognita of portability issues and kernel bugs.
>>
>> TL>                         regards, 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.

THH> What?  You don't automatically recompile your OS kernel when you build a
THH> system in the first place??  First step on any OS install of FreeBSD is to
THH> rid myself of the 'extras' that are in the generic kernel, and enable
THH> SharedMemory (even if I'm not using PgSQL on that machine) ...

heihei, why do you think users always using FreeBSD and not other
UNIX systemes?
your assume is false.

---
Xu Yifeng



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