2001-04-07 18:27:42

by Miles Lane

Subject: 2.4.3-ac2 -- How do I determine if shm is being used?

I have mounted:

none on /var/shm type shm (rw)
tmpfs on /dev/shm type tmpfs (rw)

Yet, running "x11perf -shmput10" gives me:

X Error of failed request: BadValue (integer parameter out of range for
operation)
Major opcode of failed request: 146 (MIT-SHM)
Minor opcode of failed request: 3 (X_ShmPutImage)
Value in failed request: 0x1600001
Serial number of failed request: 35107
Current serial number in output stream: 35111

I'd like to check to make sure that shm is actually accessible
to my programs. Is there any easy way to do this?

I have already checked the values of:

/proc/sys/kernel/shmall = 2000000
/proc/sys/kernel/shmmax = 4096
/proc/sys/kernel/shmmni = 35000000

Thanks,
Miles

2001-04-08 11:32:39

by Christoph Rohland

Subject: Re: 2.4.3-ac2 -- How do I determine if shm is being used?

Hi Miles,

On Sat, 07 Apr 2001, Miles Lane wrote:
> I have mounted:
>
> none on /var/shm type shm (rw)

Not necessary any more.

> tmpfs on /dev/shm type tmpfs (rw)

Also not necessary, but recommended for POSIX shm. BTW it will not
work with Linus' kernel. Type "shm" is supported by both versions.

> X Error of failed request: BadValue (integer parameter out of range
> for operation)
> Major opcode of failed request: 146 (MIT-SHM)
> Minor opcode of failed request: 3 (X_ShmPutImage)
> Value in failed request: 0x1600001
> Serial number of failed request: 35107
> Current serial number in output stream: 35111

Ubfortunately this does not tell what it wanted to do.

> I'd like to check to make sure that shm is actually accessible
> to my programs. Is there any easy way to do this?

ipcs should be your friend. Especially 'ipcs -lm'.

Greetings
Christoph