[1003.1(2016)/Issue7+TC2 0001293]: Add methods associated with manipulating pthread affinity on SMP systems
The following issue has been CLOSED. == http://austingroupbugs.net/view.php?id=1293 == Reported By:joelsherrill Assigned To: == Project:1003.1(2016)/Issue7+TC2 Issue ID: 1293 Category: Base Definitions and Headers Type: Enhancement Request Severity: Editorial Priority: normal Status: Closed Name: Joel Sherrill Organization: RTEMS.org User Reference: Section:pthread.h and add sys/cpuset.h Page Number:NA - addition request Line Number:NA - addition request Interp Status: --- Final Accepted Text:See http://austingroupbugs.net/view.php?id=1293#c4624. Resolution: Rejected Fixed in Version: == Date Submitted: 2019-09-27 19:53 UTC Last Modified: 2019-10-17 15:59 UTC == Summary:Add methods associated with manipulating pthread affinity on SMP systems == Issue History Date ModifiedUsername FieldChange == 2019-09-27 19:53 joelsherrill New Issue 2019-09-27 19:53 joelsherrill Name => Joel Sherrill 2019-09-27 19:53 joelsherrill Organization => RTEMS.org 2019-09-27 19:53 joelsherrill Section => pthread.h and add sys/cpuset.h 2019-09-27 19:53 joelsherrill Page Number => NA - addition request 2019-09-27 19:53 joelsherrill Line Number => NA - addition request 2019-09-30 08:59 Konrad_Schwarz Note Added: 0004574 2019-10-17 15:58 Don Cragun Note Added: 0004624 2019-10-17 15:59 Don Cragun Interp Status => --- 2019-10-17 15:59 Don Cragun Final Accepted Text => See http://austingroupbugs.net/view.php?id=1293#c4624. 2019-10-17 15:59 Don Cragun Resolution Open => Rejected 2019-10-17 15:59 Don Cragun Status New => Closed ==
[1003.1(2016)/Issue7+TC2 0001293]: Add methods associated with manipulating pthread affinity on SMP systems
The following issue has been UPDATED. == http://austingroupbugs.net/view.php?id=1293 == Reported By:joelsherrill Assigned To: == Project:1003.1(2016)/Issue7+TC2 Issue ID: 1293 Category: Base Definitions and Headers Type: Enhancement Request Severity: Editorial Priority: normal Status: New Name: Joel Sherrill Organization: RTEMS.org User Reference: Section:pthread.h and add sys/cpuset.h Page Number:NA - addition request Line Number:NA - addition request Interp Status: --- Final Accepted Text:See http://austingroupbugs.net/view.php?id=1293#c4624. == Date Submitted: 2019-09-27 19:53 UTC Last Modified: 2019-10-17 15:59 UTC == Summary:Add methods associated with manipulating pthread affinity on SMP systems == Issue History Date ModifiedUsername FieldChange == 2019-09-27 19:53 joelsherrill New Issue 2019-09-27 19:53 joelsherrill Name => Joel Sherrill 2019-09-27 19:53 joelsherrill Organization => RTEMS.org 2019-09-27 19:53 joelsherrill Section => pthread.h and add sys/cpuset.h 2019-09-27 19:53 joelsherrill Page Number => NA - addition request 2019-09-27 19:53 joelsherrill Line Number => NA - addition request 2019-09-30 08:59 Konrad_Schwarz Note Added: 0004574 2019-10-17 15:58 Don Cragun Note Added: 0004624 2019-10-17 15:59 Don Cragun Interp Status => --- 2019-10-17 15:59 Don Cragun Final Accepted Text => See http://austingroupbugs.net/view.php?id=1293#c4624. 2019-10-17 15:59 Don Cragun Resolution Open => Rejected ==
[1003.1(2016)/Issue7+TC2 0001293]: Add methods associated with manipulating pthread affinity on SMP systems
A NOTE has been added to this issue. == http://austingroupbugs.net/view.php?id=1293 == Reported By:joelsherrill Assigned To: == Project:1003.1(2016)/Issue7+TC2 Issue ID: 1293 Category: Base Definitions and Headers Type: Enhancement Request Severity: Editorial Priority: normal Status: New Name: Joel Sherrill Organization: RTEMS.org User Reference: Section:pthread.h and add sys/cpuset.h Page Number:NA - addition request Line Number:NA - addition request Interp Status: --- Final Accepted Text: == Date Submitted: 2019-09-27 19:53 UTC Last Modified: 2019-10-17 15:58 UTC == Summary:Add methods associated with manipulating pthread affinity on SMP systems == -- (0004624) Don Cragun (manager) - 2019-10-17 15:58 http://austingroupbugs.net/view.php?id=1293#c4624 -- This was discussed during the 2019-10-17 conference call: As noted in http://austingroupbugs.net/view.php?id=1293#c4574, this problem has very hardware specific issues. Since the POSIX standards are not intended to be hardware specific, we do not feel that this is an appropriate set of interfaces to be included at this time... If another standards body does produce a standard in this area that provides generic hardware support, we will then consider referencing that standard the same way POSIX.1-2018 references the 1999 C Standard. But also note that this seems to be a type of system configuration and resource availability issue that is specifically listed as outside the scope of the current standard in Section 1.1 Scope in the Introduction to the current standard. OpenMP is a group that is working in this area. This enhancement request is rejected. Issue History Date ModifiedUsername FieldChange == 2019-09-27 19:53 joelsherrill New Issue 2019-09-27 19:53 joelsherrill Name => Joel Sherrill 2019-09-27 19:53 joelsherrill Organization => RTEMS.org 2019-09-27 19:53 joelsherrill Section => pthread.h and add sys/cpuset.h 2019-09-27 19:53 joelsherrill Page Number => NA - addition request 2019-09-27 19:53 joelsherrill Line Number => NA - addition request 2019-09-30 08:59 Konrad_Schwarz Note Added: 0004574 2019-10-17 15:58 Don Cragun Note Added: 0004624 ==
[1003.1(2016)/Issue7+TC2 0001293]: Add methods associated with manipulating pthread affinity on SMP systems
A NOTE has been added to this issue.
==
http://austingroupbugs.net/view.php?id=1293
==
Reported By:joelsherrill
Assigned To:
==
Project:1003.1(2016)/Issue7+TC2
Issue ID: 1293
Category: Base Definitions and Headers
Type: Enhancement Request
Severity: Editorial
Priority: normal
Status: New
Name: Joel Sherrill
Organization: RTEMS.org
User Reference:
Section:pthread.h and add sys/cpuset.h
Page Number:NA - addition request
Line Number:NA - addition request
Interp Status: ---
Final Accepted Text:
==
Date Submitted: 2019-09-27 19:53 UTC
Last Modified: 2019-09-30 08:59 UTC
==
Summary:Add methods associated with manipulating pthread
affinity on SMP systems
==
--
(0004574) Konrad_Schwarz (reporter) - 2019-09-30 08:59
http://austingroupbugs.net/view.php?id=1293#c4574
--
I am pretty sure affinity was not included in Pthreads because the
heterogeneity of NUMA machines made it too difficult to define a useful
API.
I.e., code running on super computers ideally requires the ability to
figure
out the interconnection speed of cores: are two cores merely hardware
("hyper") threads, or co-located on the same chip,
or connected via a backplane?
Issue History
Date ModifiedUsername FieldChange
==
2019-09-27 19:53 joelsherrill New Issue
2019-09-27 19:53 joelsherrill Name => Joel Sherrill
2019-09-27 19:53 joelsherrill Organization => RTEMS.org
2019-09-27 19:53 joelsherrill Section => pthread.h and add
sys/cpuset.h
2019-09-27 19:53 joelsherrill Page Number => NA - addition
request
2019-09-27 19:53 joelsherrill Line Number => NA - addition
request
2019-09-30 08:59 Konrad_Schwarz Note Added: 0004574
==
[1003.1(2016)/Issue7+TC2 0001293]: Add methods associated with manipulating pthread affinity on SMP systems
The following issue has been SUBMITTED. == http://austingroupbugs.net/view.php?id=1293 == Reported By:joelsherrill Assigned To: == Project:1003.1(2016)/Issue7+TC2 Issue ID: 1293 Category: Base Definitions and Headers Type: Enhancement Request Severity: Editorial Priority: normal Status: New Name: Joel Sherrill Organization: RTEMS.org User Reference: Section:pthread.h and add sys/cpuset.h Page Number:NA - addition request Line Number:NA - addition request Interp Status: --- Final Accepted Text: == Date Submitted: 2019-09-27 19:53 UTC Last Modified: 2019-09-27 19:53 UTC == Summary:Add methods associated with manipulating pthread affinity on SMP systems Description: At least FreeBSD, Linux, and RTEMS implement a very similar set of methods to support manipulation of pthread affinity on SMP systems. This is a proposal to consider the addition of a set of methods supporting this capability. The end solution should include the capabilities in existing implementations but needs to standardize the method signatures and types. - sys/cpuset.h defines a data structure which is a bitmap representing the affinity set and operations on that structure. It is similar in concept to sigset_t but beyond filling and clearing operations, there methods that are more like boolean operations. Ref for Linux: - pthread.h includes methods to set the affinity as part of the pthread_attr_t that is set at creation time and dynamically. The dynamic methods on Linux are defined as: #include int pthread_setaffinity_np(pthread_t thread, size_t cpusetsize, const cpu_set_t *cpuset); int pthread_getaffinity_np(pthread_t thread, size_t cpusetsize, cpu_set_t *cpuset); Those that set the attribute are defined as: #include int pthread_attr_setaffinity_np(pthread_attr_t *attr, size_t cpusetsize, const cpu_set_t *cpuset); int pthread_attr_getaffinity_np(const pthread_attr_t *attr, size_t cpusetsize, cpu_set_t *cpuset); Desired Action: Add support for manipulation of pthread affinity. == Issue History Date ModifiedUsername FieldChange == 2019-09-27 19:53 joelsherrill New Issue 2019-09-27 19:53 joelsherrill Name => Joel Sherrill 2019-09-27 19:53 joelsherrill Organization => RTEMS.org 2019-09-27 19:53 joelsherrill Section => pthread.h and add sys/cpuset.h 2019-09-27 19:53 joelsherrill Page Number => NA - addition request 2019-09-27 19:53 joelsherrill Line Number => NA - addition request ==
