Oninit cdi / Archive
Talk to an expert →

IFX_LARGE_PAGES (AIX)

Posted in 2009

Topics: Performance & Tuning, Platform-Specific Issues

Clifton Bean — — source: IIUG Forums & Mailing Lists

IDS 11.5.FC5, AIX 5.3 The information listed below is listed TWICE on consecutive pages within the Performance Tuning Manual, page 72-73: “On AIX and Solaris systems that support large pages, the IFX_LARGE_PAGES environment variable can enable the use of large pages for non-message shared memory segments that are locked in physical memory. If large pages have been configured by operating system commands and the RESIDENT configuration parameter specifies that some or all of the resident and virtual portions of shared memory are locked in physical memory, Dynamic Server will use large pages for the corresponding shared memory segments, provided sufficient large pages are available. The use of large pages can offer significant performance benefits in large memory configurations.” Has anyone implemented this feature? What is/were your experiences with it? What value is IFX_LARGE_PAGES set to in order to enable the use of the large pages? Thanks in advance for your assistance. Clifton _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. http://clk.atdmt.com/GBL/go/177141665/direct/01/

↪ replying to Clifton Bean
Art Kagel — — source: IIUG Forums & Mailing Lists

I turned it on at one Sun site and it didn't work until some kernel settings were changed. No report as to performance or system overhead differences. Art Art S. Kagel Oninit (www.oninit.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Oninit, the IIUG, nor any other organization with which I am associated either explicitly or implicitly. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. On Thu, Oct 8, 2009 at 3:12 PM, Clifton Bean <clifton_bean@hotmail.com>wrote: > IDS 11.5.FC5, AIX 5.3 > > The information listed below is listed TWICE on consecutive pages within > the > Performance Tuning Manual, page 72-73: > > “On AIX and Solaris systems that support large pages, the IFX_LARGE_PAGES > environment variable can enable the use of large pages for non-message > shared > memory segments that are locked in physical memory. If large pages have > been > configured by operating system commands and the RESIDENT configuration > parameter specifies that some or all of the resident and virtual portions > of > shared memory are locked in physical memory, Dynamic Server will use large > pages for the corresponding shared memory segments, provided sufficient > large > pages are available. The use of large pages can offer significant > performance > benefits in large memory configurations.” > > Has anyone implemented this feature? What is/were your experiences with it? > > What value is IFX_LARGE_PAGES set to in order to enable the use of the > large > pages? > > Thanks in advance for your assistance. > Clifton > > _________________________________________________________________ > Hotmail: Trusted email with powerful SPAM protection. > http://clk.atdmt.com/GBL/go/177141665/direct/01/ > > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > --00151747bfe27522a6047571871f

Glossary