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MQSeries.net Forum Index » IBM MQ Installation/Configuration Support » MQv7 AMQ8119: Unsupported threading model detected.

MQv7 AMQ8119: Unsupported threading model detected.

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dannymq

Posted: Wed Oct 15, 2008 5:22 pm Post subject: MQv7 AMQ8119: Unsupported threading model detected.

Newbie

Joined: 15 Oct 2008
Posts: 5

Hi,

Just installed MQv7 on a SUSE Linux Enterprise Server 9 running
glib 2.3.3. kernel 2.6.5

Installation runs fine but then it complains about threading models

crtmqm -q mars.queue.manager
AMQ8119: Unsupported threading model detected.

The beta verrsion of MQv7 worked fine as did V6 on this server
Any tips on this error ?

SOME RESEARCH
Most modern Linux distributions ship with both LinuxThreads and NPTL, and they provide a facility to switch between the two. To discover which version of which thread library you're currently using on your system, run the following command:
$ getconf GNU_LIBPTHREAD_VERSION
The output will look something like this:
NPTL 0.34
Or:
linuxthreads-0.10

We get linuxthreads-0.10

strange as I did a "rpm -q glibc" which returned glibc-2.3.3-98.96

Glibc2.3.3 should have NPTL 0.61 from all I have read

dannymq

Posted: Sun Oct 19, 2008 9:36 pm Post subject:

Newbie

Joined: 15 Oct 2008
Posts: 5

One thing i noticed is that glibc on this server does not provide the NPTL threads alternative to Linux threads. Could this be the problem ?

Does MQ7 only work with NPTL threads ? Do i need a version of the glibc RPM that supports NPTL threads ?

>ldd /opt/mqm/bin/crtmqm
linux-gate.so.1 => (0xffffe000)
libm.so.6 => /lib/libm.so.6 (0x40008000)
libmqml_r.so => /opt/mqm/lib/libmqml_r.so (0x4002a000)
libmqmcs_r.so => /opt/mqm/lib/libmqmcs_r.so (0x404ea000)
libmqmr_r.so => /opt/mqm/lib/libmqmr_r.so (0x40751000)
libmqz_r.so => /opt/mqm/lib/libmqz_r.so (0x4098a000)
libmqm_r.so => /opt/mqm/lib/libmqm_r.so (0x40b0a000)
libmqmzse.so => /opt/mqm/lib/libmqmzse.so (0x40b31000)
libpthread.so.0 => /lib/libpthread.so.0 (0x40b33000)
libdl.so.2 => /lib/libdl.so.2 (0x40b86000)
libc.so.6 => /lib/libc.so.6 (0x40b89000)
/lib/ld-linux.so.2 (0x80000000)

>rpm -ql glibc | grep tls
< returns nothing> to no /lib/tls support

dannymq

Posted: Mon Oct 20, 2008 11:16 pm Post subject: I tested this out for my self - NPTL required for MQv7

Newbie

Joined: 15 Oct 2008
Posts: 5

# I have 2.6 version of kernel.
+ uname -a
Linux sles9 2.6.5-7.311-smp #1 SMP Mon Mar 10 13:12:16 UTC 2008 i686 i686 i386 GNU/Linux

# NPTL threads used by default.
+ getconf GNU_LIBPTHREAD_VERSION
NPTL 2.3.5

# mqV7 works fine
+ crtmqm
AMQ7048: The queue manager name is either not valid or not known

# i can see the NPTL TLS libraries
+ ldd /opt/mqm/bin/crtmqm | grep tls
libm.so.6 => /lib/tls/libm.so.6 (0x4001e000)
libpthread.so.0 => /lib/tls/libpthread.so.0 (0x40b49000)
libc.so.6 => /lib/tls/libc.so.6 (0x40b5c000)

# Ok now lets try linuxthreads as GLIB is compiled to support both
# Lets force it.
+ export LD_ASSUME_KERNEL=2.4.1

# Verified we are using linuxthreads
+ getconf GNU_LIBPTHREAD_VERSION
linuxthreads-0.10

# Oops MQv7 dosn't like the linuxthreads threading model!!!
+ crtmqm
AMQ8119: Unsupported threading model detected.
+ ldd /opt/mqm/bin/crtmqm | grep tls

MY ISSUE/RESOLUTION
---------------------------
A version of glibc was installed that was not compiled with NPTL support. My only way to resolve this is to somehow force an install of glibc compiled with NPTL support.

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