Re: [GENERAL] PostgreSQL 6.4 problems on Linux.

Oliver Elphick wrote:

> Fabio Mancinelli wrote:
> >On Sat, 7 Nov 1998, Kevin Lo wrote:
> >
> >> % IpcMemoryCreate: shmget failed (Invalid argument) key=543200
> >> 1, size=831176, permission=600
> >> FATAL 1: ShmemCreate: cannot create region
> >>
> >If I am not wrong shmem has to do with X shared memory extension from MIT.
> >Probably you try to run postgres not on the host you are logged on.
> >I've seen that postgres can be compiled with X support. Try to disable it.
> >
> >Bye
> >
> >P.S. : Probably I am completely wrong! :)
>
> I think so... I am able to start the postmaster with -i in Linux 2.0.34.
>
> The error '(Invalid argument)' is presumably from the kernel:
>
> >From the kernel code:
> if (size > shp->shm_segsz)
> return -EINVAL;
>
> This bit of code is run if an existing shared memory segment is found;
> so the problem seems to be that the segment found is too small for the
> request made of it.
>
> I suggest that he use ipcrm to clear shared memory segments and then try
> again.

Hi, Oliver,

I don't know how to use ipcrm, would you like to teach me, thanks.
For example, I run ipcrm shm, it displays:

ipcrm shm
usage: ipcrm [shm | msg | sem] id

What does 'id' mean?

> One puzzle for me is that ipcs does not report any shared memory in use,
> even with two backends using the same database. I thought shared memory
> was used to do locking??
>
> (This may be to do with the fact that I am not running my normal kernel
> version at the moment.)

I think maybe that's the 6.4 problem, because I can run postmaster on 6.3 with
no problems.
Now I can't find 6.3 source code, so please help me, thank you very much!

- Kevin.