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AIX
Strange Real Memory usage behavior
Post 302119353 by Skyybugg on Tuesday 29th of May 2007 11:24:07 AM
05-29-2007
Strange Real Memory usage behavior
We have 2 Rs6000 S-85
Each initially had/have 6 processors and 8 GIG of RAM each
Node 1 we added 14 processors and 32 GIG of RAM On May 19. (11 days ago)
My memory utilization reporting for node 1 showed a spike in available memory 25-30GB for May 19 to 25 . I kind of expected this because I did not think the app would try to take any more memory. Then suddenly since the 26th, available Real memory took a sudden drop down to 2 GB!
Virtual memory up until the 26th was hovering around 80% since then and now it is at 99%.
Application on the node is is Health care System called Cerner. It also Runs MQ Series Middleware.
It is almost like the system realized it had the memory to use Saturday morning and has since then decided to use it!
I have not yet added paging space for this memory, if it is needed. I need to look into that. I believe there is an economy of scale or breaking point for paging. Currently paging space is at 8192MB currently.
The memory and CPU we added were a total surprise. Our vender may not have known what they sent us. We thought we were getting 4 more CPU and anothe 8 GIG of RAM. Instead we got 14 CPU and 32GIG of RAM! Christmas in May!
We are going to give node 2 the same treatment for memory and CPU (which strictly runs a 300 GB Oracle database)
I am just not sure what to make of node 1 behaviour.
Any comments are appreciated. SkyyBugg
Each initially had/have 6 processors and 8 GIG of RAM each
Node 1 we added 14 processors and 32 GIG of RAM On May 19. (11 days ago)
My memory utilization reporting for node 1 showed a spike in available memory 25-30GB for May 19 to 25 . I kind of expected this because I did not think the app would try to take any more memory. Then suddenly since the 26th, available Real memory took a sudden drop down to 2 GB!
Virtual memory up until the 26th was hovering around 80% since then and now it is at 99%.
Application on the node is is Health care System called Cerner. It also Runs MQ Series Middleware.
It is almost like the system realized it had the memory to use Saturday morning and has since then decided to use it!
I have not yet added paging space for this memory, if it is needed. I need to look into that. I believe there is an economy of scale or breaking point for paging. Currently paging space is at 8192MB currently.
The memory and CPU we added were a total surprise. Our vender may not have known what they sent us. We thought we were getting 4 more CPU and anothe 8 GIG of RAM. Instead we got 14 CPU and 32GIG of RAM! Christmas in May!
We are going to give node 2 the same treatment for memory and CPU (which strictly runs a 300 GB Oracle database)
I am just not sure what to make of node 1 behaviour.
Any comments are appreciated. SkyyBugg
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LEARN ABOUT CENTOS
hwloc_nodeset_t
Object sets (hwloc_cpuset_t and hwloc_nodeset_t)(3) Hardware Locality (hwloc) Object sets (hwloc_cpuset_t and hwloc_nodeset_t)(3) NAME
Object sets (hwloc_cpuset_t and hwloc_nodeset_t) - Typedefs typedef hwloc_bitmap_t hwloc_cpuset_t typedef hwloc_const_bitmap_t hwloc_const_cpuset_t typedef hwloc_bitmap_t hwloc_nodeset_t typedef hwloc_const_bitmap_t hwloc_const_nodeset_t Detailed Description Hwloc uses bitmaps to represent two distinct kinds of object sets: CPU sets (hwloc_cpuset_t) and NUMA node sets (hwloc_nodeset_t). These types are both typedefs to a common back end type (hwloc_bitmap_t), and therefore all the hwloc bitmap functions are applicable to both hwloc_cpuset_t and hwloc_nodeset_t (see The bitmap API). The rationale for having two different types is that even though the actions one wants to perform on these types are the same (e.g., enable and disable individual items in the set/mask), they're used in very different contexts: one for specifying which processors to use and one for specifying which NUMA nodes to use. Hence, the name difference is really just to reflect the intent of where the type is used. Typedef Documentation typedef hwloc_const_bitmap_t hwloc_const_cpuset_t A non-modifiable hwloc_cpuset_t. typedef hwloc_const_bitmap_t hwloc_const_nodeset_t A non-modifiable hwloc_nodeset_t. typedef hwloc_bitmap_t hwloc_cpuset_t A CPU set is a bitmap whose bits are set according to CPU physical OS indexes. It may be consulted and modified with the bitmap API as any hwloc_bitmap_t (see hwloc/bitmap.h). typedef hwloc_bitmap_t hwloc_nodeset_t A node set is a bitmap whose bits are set according to NUMA memory node physical OS indexes. It may be consulted and modified with the bitmap API as any hwloc_bitmap_t (see hwloc/bitmap.h). When binding memory on a system without any NUMA node (when the whole memory is considered as a single memory bank), the nodeset may be either empty (no memory selected) or full (whole system memory selected). See also Conversion between cpuset and nodeset. Author Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code. Version 1.7 Sun Apr 7 2013 Object sets (hwloc_cpuset_t and hwloc_nodeset_t)(3)