Comments on: Oracle on Opteron with Linux-The NUMA Angle (Part VI). Introducing Cyclops. http://kevinclosson.wordpress.com/2007/04/05/oracle-on-opteron-with-linux-the-numa-angle-part-vi-introducing-cyclops/ Oracle-related Platform, Storage and Clustering Topics (with the occasional rant) Thu, 12 Nov 2009 21:20:02 +0000 http://wordpress.com/ hourly 1 By: kevinclosson http://kevinclosson.wordpress.com/2007/04/05/oracle-on-opteron-with-linux-the-numa-angle-part-vi-introducing-cyclops/#comment-32651 kevinclosson Tue, 29 Apr 2008 16:44:17 +0000 http://kevinclosson.wordpress.com/2007/04/05/oracle-on-opteron-with-linux-the-numa-angle-part-vi-introducing-cyclops/#comment-32651 Hi Charles, It turns out that mention of a particular setting in a Validated Configuration doesn't imply a support requirement. That aside, I really can't comment on anything NUMA related in RHEL3 since I abandoned that long before I even got that DL585...which I no longer have since it is in an HP lab and I've moved on to Oracle... Hi Charles,

It turns out that mention of a particular setting in a Validated Configuration doesn’t imply a support requirement. That aside, I really can’t comment on anything NUMA related in RHEL3 since I abandoned that long before I even got that DL585…which I no longer have since it is in an HP lab and I’ve moved on to Oracle…

]]> By: kevinclosson http://kevinclosson.wordpress.com/2007/04/05/oracle-on-opteron-with-linux-the-numa-angle-part-vi-introducing-cyclops/#comment-32652 kevinclosson Tue, 29 Apr 2008 16:42:19 +0000 http://kevinclosson.wordpress.com/2007/04/05/oracle-on-opteron-with-linux-the-numa-angle-part-vi-introducing-cyclops/#comment-32652 Hi Charles, It turns out that mention of a particular setting in a Validated Configuration doesn't imply a support requirement. That aside, I really can't comment on anything NUMA related in RHEL3 since I abandoned that long before I even got that DL585...which I no longer have since it is in an HP lab and I've moved on to Oracle... Hi Charles,

It turns out that mention of a particular setting in a Validated Configuration doesn’t imply a support requirement. That aside, I really can’t comment on anything NUMA related in RHEL3 since I abandoned that long before I even got that DL585…which I no longer have since it is in an HP lab and I’ve moved on to Oracle…

]]> By: Charles C. Figueiredo http://kevinclosson.wordpress.com/2007/04/05/oracle-on-opteron-with-linux-the-numa-angle-part-vi-introducing-cyclops/#comment-32650 Charles C. Figueiredo Mon, 28 Apr 2008 21:44:21 +0000 http://kevinclosson.wordpress.com/2007/04/05/oracle-on-opteron-with-linux-the-numa-angle-part-vi-introducing-cyclops/#comment-32650 This is an excellent and very informative thread of blog, Kevin. Thanks! I'm curious, have you done any testing or have any insights into vm.numa_memory_allocator? There is little info available on this tunable that I've found so far, and before I start sifting through kernel source, I wanted to throw this out there. This was added to Update 7 of RHEL 3 (yes, I know, a bit dated at this point), but since Oracle recommends disabling NUMA on DL 585 gear, and I'm using that with RHEL 3 U8+, I'm curious about no NUMA vs. leaving it enabled in the BIOS and using this tunable. I'm wondering if it helps avoid the cyclops scenario... Thanks, -charles. This is an excellent and very informative thread of blog, Kevin. Thanks!

I’m curious, have you done any testing or have any insights into vm.numa_memory_allocator? There is little info available on this tunable that I’ve found so far, and before I start sifting through kernel source, I wanted to throw this out there. This was added to Update 7 of RHEL 3 (yes, I know, a bit dated at this point), but since Oracle recommends disabling NUMA on DL 585 gear, and I’m using that with RHEL 3 U8+, I’m curious about no NUMA vs. leaving it enabled in the BIOS and using this tunable. I’m wondering if it helps avoid the cyclops scenario…

Thanks,

-charles.

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