Editing Non-uniform memory access (section)

== Software support ==
Since NUMA largely influences memory access performance, certain software optimizations are needed to allow scheduling threads and processes close to their in-memory data.

* [[Microsoft]] [[Windows 7]] and [[Windows Server 2008 R2]] added support for NUMA architecture over 64 logical cores.<ref>[http://msdn.microsoft.com/en-us/library/windows/desktop/aa363804%28v=vs.85%29.aspx NUMA Support (MSDN)]</ref>
* [[Java 7]] added support for NUMA-aware memory allocator and [[Garbage collection (computer science)|garbage collector]].<ref>[http://docs.oracle.com/javase/7/docs/technotes/guides/vm/performance-enhancements-7.html#numa Java HotSpot Virtual Machine Performance Enhancements]</ref>
* [[Linux kernel]]:
**Version 2.5 provided a basic NUMA support,<ref>{{Cite web
 | url = http://lse.sourceforge.net/numa/
 | title = Linux Scalability Effort: NUMA Group Homepage
 | date = 2002-11-20 | access-date = 2014-02-06
 | website = SourceForge.net
}}</ref> which was further improved in subsequent kernel releases.
**Version 3.8 of the Linux kernel brought a new NUMA foundation that allowed development of more efficient NUMA policies in later kernel releases.<ref>{{Cite web
 | url = http://kernelnewbies.org/Linux_3.8#head-c16d4288b51f0b50fbf615657e81b0db643fa7a0
 | title = Linux kernel 3.8, Section 1.8. Automatic NUMA balancing
 | date = 2013-02-08 | access-date = 2014-02-06
 | website = kernelnewbies.org
}}</ref><ref>{{Cite web
 | url = https://lwn.net/Articles/524977/
 | title = NUMA in a hurry
 | date = 2012-11-14 | access-date = 2014-02-06
 | author = Jonathan Corbet | publisher = [[LWN.net]]
}}</ref> 
**Version 3.13 of the Linux kernel brought numerous policies that aim at putting a process near its memory, together with the handling of cases such as having [[memory page]]s shared between processes, or the use of transparent [[huge page]]s; new [[sysctl]] settings allow NUMA balancing to be enabled or disabled, as well as the configuration of various NUMA memory balancing parameters.<ref>{{Cite web
 | url = http://kernelnewbies.org/Linux_3.13#head-d29c7db2e73bc464eb67ed8de953d0bfc9841636
 | title = Linux kernel 3.13, Section 1.6. Improved performance in NUMA systems
 | date = 2014-01-19 | access-date = 2014-02-06
 | website = kernelnewbies.org
}}</ref><ref>{{Cite web
 | url = https://www.kernel.org/doc/Documentation/sysctl/kernel.txt
 | title = Linux kernel documentation: Documentation/sysctl/kernel.txt
 | access-date = 2014-02-06
 | publisher = [[kernel.org]]
}}</ref><ref>{{Cite web
 | url = https://lwn.net/Articles/568870/
 | title = NUMA scheduling progress
 | date = 2013-10-01 | access-date = 2014-02-06
 | author = Jonathan Corbet | publisher = [[LWN.net]]
}}</ref>
* [[OpenSolaris]] models NUMA architecture with lgroups.
* [[FreeBSD]] added support for NUMA architecture in version 9.0.<ref>{{Cite web|title=numa(4)|url=https://www.freebsd.org/cgi/man.cgi?numa(4)|access-date=2020-12-03|website=www.freebsd.org}}</ref>
*[[Silicon Graphics]] [[IRIX]] (discontinued as of 2021) support for ccNUMA architecture over 1240 CPU with Origin server series.