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Patch Name: PHCO_26466
Patch Description: s700_800 11.11 Pthread additive perf enhancement & fixes
Creation Date: 02/04/05
Post Date: 02/05/06
Repost: 02/11/19
The Resolution information was modified to correct the list
of patches required to activate the PTHREAD_PROCESS_SHARED
feature.
Hardware Platforms - OS Releases:
s700: 11.11
s800: 11.11
Products: N/A
Filesets:
OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP
Automatic Reboot?: No
Status: General Superseded
Critical:
No (superseded patches were critical)
PHCO_25751: ABORT
PHCO_25226: OTHER
Performance degradation and sudden increase in
CPU utilization due to mutex contention.
Category Tags:
defect_repair enhancement general_release critical
halts_system manual_dependencies
Path Name: /hp-ux_patches/s700_800/11.X/PHCO_26466
Symptoms:
PHCO_26466:
( SR:8606226668 CR:JAGad95731 )
pthread_mutex_destroy() intermittently returns
EBUSY even when there are no threads accessing the mutex.
( SR:8606231620 CR:JAGae00858 )
Enhancement: This product update is a member of a set
needed to enable "Release mode" functionality for
PTHREAD_PROCESS_SHARED mutexes.
The full list of product updates required for this feature
are: PHKL_26467, PHKL_26468, PHKL_26469 and PHCO_26466.
If any member of this set of product updates is not
installed, this product update will have no impact on
your system.
PHCO_25751:
( SR:8606226436 CR:JAGad95505 )
Pthread internal error is reported and core is dumped
Error message : "__pthread_startup: can't enable gang
scheduling".
( SR:8606232147 CR:JAGae01383 )
Software providers may observe performance deficiencies in
applications which heavily use shared mutexes. Performance
of a PTHREAD_PROCESS_SHARED mutex unlock operation is slower
than that of a PTHREAD_PROCESS_PRIVATE mutex, even in the
non-contended (i.e., no waiters) case.
The full list of product updates required for this feature
are: PHKL_26316, PHKL_26240, and PHCO_25751.
If any member of this set of product updates is not
installed, this product update will have no impact on your
system.
PHCO_25226:
( SR:8606186378 CR:JAGad55582 )
Heavy mutex contention seen when large number of
threads try to acquire a single mutex lock, leading
to performance degradation and sudden jump in CPU
utilization.
PHCO_24584:
( SR:8606200799 CR:JAGad69975 )
This patch is a member of a set of patches needed to enable
the HP-UX Processor Sets product (PROCSETS). When PROCSETS
product is installed, it will install the full set of
required patches for that product, including this patch.
If the HP-UX Processor Sets product is not installed, this
change will have no impact on your system.
PHCO_23846:
( SR:8606184540 CR:JAGad53747 )
This enhancement is to support initialized tls support for
Fortran OpenMP. Changes are made in pthread library.
Defect Description:
PHCO_26466:
( SR:8606226668 CR:JAGad95731 )
The problem with pthread_mutex_destroy() is attributed
to the fact that, pthread_mutex_unlock() does not keep
track of the number of waiters accurately. The mutex
cannot be destroyed when there are waiters,
and hence EBUSY is returned by pthread_mutex_destroy().
Resolution:
The change introduced in this patch update will
accurately keep track of all the waiters.
( SR:8606231620 CR:JAGae00858 )
This product update enables enable
"Release mode" functionality for PTHREAD_PROCESS_SHARED
mutexes. "Release mode" for PTHREAD_PROCESS_SHARED
mutexes is a feature that can be used to increase the
performance of the mutex in some cases where
there is high contention for the mutex.
Previously all shared mutexes use a "handoff"
mechanism to operate on mutexes whereby a mutex
lock is never really released, but rather handed
over to the highest priority waiter, if any.
This was done to adhere to standards whereby a
low priority thread shall not acquire the mutex
when there is a higher priority POSIX realtime
thread waiting for the same mutex. This made
the protocol less efficient in some cases since
another running thread could acquire and release
the mutex interim, hence making progress. This
enhancement still uses the original "handoff"
mechanism as the default case, but allows the
selection of "Release mode" to turn off the
"handoff" mechanism if it is desired.
Resolution:
This product update employs the kernel
support delivered in PHKL_26467, PHKL_26468 and PHKL_26469
for enabling release mode for PTHREAD_PROCESS_SHARED
mutexes. The changes can be enabled either by using
the API (pthread_mutex_disable_handoff_np() or
pthread_mutexattr_disable_handoff_np()) or by
setting the environment variable
PTHREAD_DISABLE_HANDOFF=ON. Applications will not
adhere to real-time semantics if this functionality
is enabled, however it can avail the performance
benefits provided by this product update.
PHCO_25751:
( SR:8606226436 CR:JAGad95505 )
The gang scheduler is currently supported only in Default
pset,so the request to enable gang scheduling for a process
in non-default pset would fail. The pthread library does not
recognize this scenario, and it fails the startup of new
application.
Resolution:
The pthread_startup() function needs to bypass the gang
scheduling requests for processes in non-default psets.
( SR:8606232147 CR:JAGae01383 )
In the PTHREAD_PROCESS_SHARED mutex case, the unlock
operation always makes a system call to synchronize with
threads in other processes which may be waiting for the
mutex. This makes the code path significantly longer.
Resolution:
Change pthread_mutex_unlock(), in the case of a shared
mutex, to call a new light weight system call rather than
the existing system call. If that new system call is not
available, then use the regular system call instead.
(PHKL_26316, also required for this enhancement,
adapts the existing system call which handles waiters of
shared mutexes to coordinate with the light weight unlock
system call. PHKL_26240, also required for this
enhancement, provides the new light weight system call
for shared mutex unlock.)
PHCO_25226:
( SR:8606186378 CR:JAGad55582 )
When large number of threads contend for a single
mutex, there is lot of contention for the internal
locks used in the library. This results in
unnecessary yielding and sleeping by the waiters
preventing the lock owner to complete the job.
Resolution:
Modified existing implementation to reduce contention
and dependency on the internal lock.
PHCO_24584:
( SR:8606200799 CR:JAGad69975 )
This patch contains minor enhancements in pthreads library
to support the HP-UX Processor Sets product.
Resolution:
Enhancements added to support new pthread_pset_bind_np()
interface in pthreads library when Processor Sets product
is enabled.
PHCO_23846:
( SR:8606184540 CR:JAGad53747 )
This is an enhancement for Initialized Thread local storage
support for Fortran OpenMP.
Resolution:
Libpthread allocates memory for TLS and it is initialized
to zero. With new enhancement the allocated TLS memory will
be initialized with the initialization image for each load
module the pointer to which is passed by libc/linker.
SR:
8606184540 8606186378 8606200799 8606226436 8606226668
8606231620 8606232147
Patch Files:
OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/libpthread.a
/usr/lib/libpthread_tr.a
OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/pa20_64/libpthread.a
/usr/lib/pa20_64/libpthread_tr.a
OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/pa20_64/libpthread.1
/usr/lib/pa20_64/libpthread_tr.1
OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/libpthread.1
/usr/lib/libpthread_tr.1
ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,
fa=HP-UX_B.11.11_32/64,v=HP:
/usr/share/man/man3.Z/pthread_ldom_bind_np.3t
/usr/share/man/man3.Z/pthread_ldom_id_np.3t
/usr/share/man/man3.Z/pthread_num_ldomprocs_np.3t
/usr/share/man/man3.Z/pthread_num_ldoms_np.3t
/usr/share/man/man3.Z/pthread_num_processors_np.3t
/usr/share/man/man3.Z/pthread_processor_bind_np.3t
/usr/share/man/man3.Z/pthread_processor_id_np.3t
/usr/share/man/man3.Z/pthread_pset_bind_np.3t
/usr/share/man/man3.Z/pthread_spu_to_ldom_np.3t
what(1) Output:
OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/libpthread.a:
Pthread Interfaces
$Revision: libpthread.a: @(#) depot-32pa CUP11.11
_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri Ap
r 5 12:27:32 PST 2002 $
/usr/lib/libpthread_tr.a:
Pthread Interfaces
$Revision: libpthread_tr.a: @(#) depot-32pa CUP11
.11_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri
Apr 5 12:27:53 PST 2002 $
OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/pa20_64/libpthread.a:
Pthread Interfaces
$Revision: libpthread.a: @(#) depot-64pa CUP11.11
_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri Ap
r 5 12:31:40 PST 2002 $
/usr/lib/pa20_64/libpthread_tr.a:
Pthread Interfaces
$Revision: libpthread_tr.a: @(#) depot-64pa CUP11
.11_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri
Apr 5 12:32:03 PST 2002 $
OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/pa20_64/libpthread.1:
Pthread Interfaces
$Revision: libpthread.1: @(#) depot-64pa CUP11.11
_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri Ap
r 5 12:29:35 PST 2002 $
/usr/lib/pa20_64/libpthread_tr.1:
Pthread Interfaces
$Revision: libpthread_tr.1: @(#) depot-64pa CUP11
.11_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri
Apr 5 12:29:58 PST 2002 $
OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
/usr/lib/libpthread.1:
Pthread Interfaces
$Revision: libpthread.1: @(#) depot-32pa CUP11.11
_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri Ap
r 5 12:25:38 PST 2002 $
/usr/lib/libpthread_tr.1:
Pthread Interfaces
$Revision: libpthread_tr.1: @(#) depot-32pa CUP11
.11_BL2002_0405_3 PATCH_11.11 PHCO_26466 Fri
Apr 5 12:26:04 PST 2002 $
ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,
fa=HP-UX_B.11.11_32/64,v=HP:
/usr/share/man/man3.Z/pthread_ldom_bind_np.3t:
None
/usr/share/man/man3.Z/pthread_ldom_id_np.3t:
None
/usr/share/man/man3.Z/pthread_num_ldomprocs_np.3t:
None
/usr/share/man/man3.Z/pthread_num_ldoms_np.3t:
None
/usr/share/man/man3.Z/pthread_num_processors_np.3t:
None
/usr/share/man/man3.Z/pthread_processor_bind_np.3t:
None
/usr/share/man/man3.Z/pthread_processor_id_np.3t:
None
/usr/share/man/man3.Z/pthread_pset_bind_np.3t:
None
/usr/share/man/man3.Z/pthread_spu_to_ldom_np.3t:
None
cksum(1) Output:
OS-Core.C-MIN-32ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
3637803589 226222 /usr/lib/libpthread.a
377374423 256174 /usr/lib/libpthread_tr.a
OS-Core.C-MIN-64ALIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
3654330436 430932 /usr/lib/pa20_64/libpthread.a
4202681625 485166 /usr/lib/pa20_64/libpthread_tr.a
OS-Core.CORE-64SLIB,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
3131179944 173936 /usr/lib/pa20_64/libpthread.1
3259082791 203576 /usr/lib/pa20_64/libpthread_tr.1
OS-Core.CORE-SHLIBS,fr=B.11.11,fa=HP-UX_B.11.11_32/64,v=HP:
716186272 155648 /usr/lib/libpthread.1
2800862565 184320 /usr/lib/libpthread_tr.1
ProgSupport.PAUX-ENG-A-MAN,fr=B.11.11,
fa=HP-UX_B.11.11_32/64,v=HP:
659961250 8518 /usr/share/man/man3.Z/pthread_ldom_bind_np.3t
659961250 8518 /usr/share/man/man3.Z/pthread_ldom_id_np.3t
659961250 8518 /usr/share/man/man3.Z/
pthread_num_ldomprocs_np.3t
659961250 8518 /usr/share/man/man3.Z/pthread_num_ldoms_np.3t
659961250 8518 /usr/share/man/man3.Z/
pthread_num_processors_np.3t
659961250 8518 /usr/share/man/man3.Z/
pthread_processor_bind_np.3t
659961250 8518 /usr/share/man/man3.Z/
pthread_processor_id_np.3t
659961250 8518 /usr/share/man/man3.Z/pthread_pset_bind_np.3t
659961250 8518 /usr/share/man/man3.Z/
pthread_spu_to_ldom_np.3t
Patch Conflicts: None
Patch Dependencies: None
Hardware Dependencies: None
Other Dependencies:
PHCO_26466: To enable the process shared mutex performance,
the following must be installed: PHKL_26467, PHKL_26468,
PHKL_26469 and PHCO_26466. These product updates may be
installed in any order. If any of these product updates are
not installed, this product update will have no impact on
your system.
PHCO_25751: To enable the pthread shared
mutex performance enhancement, the following must be
installed: PHKL_26240, PHKL_26316, and PHCO_25751
PHCO_25226: Perf changes enabled by
pthread_mutex_disable_handoff_np() or
pthread_mutexattr_disable_handoff_np() or by setting the
environment variable PTHREAD_DISABLE_HANDOFF=ON. By default
these perf changes are disabled. The first API pthread_
mutex_disable_handoff_np() is for process wide disabling of
handoff mode in all mutexes. So is the env. variable. The
pthread_mutexattr_disable_handoff_np() takes as argument
pointer to pthread_mutexattr_t and can be used to disable
handoff mode for a particular mutex. The pthread_mutex_
disable_handoff_np() has no arguments and has to be called
by the main thread before any new threads are created.
"Handoff mode" is used to strictly adhere to certain
characteristics of POSIX real-time threads. If your
application does not use any real-time threads trying to
take mutex locks, you can call this new API to get the
performance benefits. To enable the TLS feature, the
following patches should also be installed: PHCO_23427 libc
cumulative patch PHSS_23441 linker cumulative patch
PHSS_23794 linker startup patch PHSS_23953 Fortran90 B.11.01
patch
Supersedes:
PHCO_25751 PHCO_25226 PHCO_24584 PHCO_23846
Equivalent Patches: None
Patch Package Size: 2130 KBytes
Installation Instructions:
Please review all instructions and the Hewlett-Packard
SupportLine User Guide or your Hewlett-Packard support terms
and conditions for precautions, scope of license,
restrictions, and, limitation of liability and warranties,
before installing this patch.
------------------------------------------------------------
1. Back up your system before installing a patch.
2. Login as root.
3. Copy the patch to the /tmp directory.
4. Move to the /tmp directory and unshar the patch:
cd /tmp
sh PHCO_26466
5. Run swinstall to install the patch:
swinstall -x autoreboot=true -x patch_match_target=true \
-s /tmp/PHCO_26466.depot
By default swinstall will archive the original software in
/var/adm/sw/save/PHCO_26466. If you do not wish to retain a
copy of the original software, include the patch_save_files
option in the swinstall command above:
-x patch_save_files=false
WARNING: If patch_save_files is false when a patch is installed,
the patch cannot be deinstalled. Please be careful
when using this feature.
For future reference, the contents of the PHCO_26466.text file is
available in the product readme:
swlist -l product -a readme -d @ /tmp/PHCO_26466.depot
To put this patch on a magnetic tape and install from the
tape drive, use the command:
dd if=/tmp/PHCO_26466.depot of=/dev/rmt/0m bs=2k
Special Installation Instructions: None
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