Large pages in Windows / Oracle

Hi,
Has anyone here tried to activate large pages in Windows/Oracle environment?
ORA_LPENABLE = 1
Does SAP support this?
VMware pushes towards large pages.
BR,
Samuli Kaisanlahti

Hi,
Never tested it, but what I can confirm is that, at this moment, it is not supported in an SAP environment.
Br,
Javier

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Large Pages Issue in Oracle.

| Large-Page ------------------------------------------------------------------|
| |
|Count = 0 0 MB Size=16 MB (16777216 bytes) |
|Free = 0 0 MB |
|In Use= 0 0 MB High water mark=0 |
| |
|------------------------------------------------------------------------------|
nmon is reporting 0 Large Pages in use by Oracle - What could be the reason behind it ?

What could be the reason behind it ?none are in use
Post Operating System (OS) name & version for DB server system.
Post results of
SELECT * from v$version

Oracle 10gR2 LARGE PAGE SIZE on Windows 2008 x64 SP2

Hello Oracle Experts,
What are the advantages of Large Page Size and how would I know when my DB will benefit from Large Page Sizes?
My undeqrstanding is on Windows x64 – 8kb default page size – will now be 2 MB. Will this speed up accesses to buffer cache? If so is there a latch wait that I can monitor before vs. after to verify that large page size has improved performance?
My Database server has 256GB RAM and SGA is set to 180GB. I am quite sure the overhead involved in maintaining a large number of 8kb allocations (as opposed to 2MB) must be high - how can i monitor this?
I am planning to follow the procedure here:
http://download.oracle.com/docs/html/B13831_01/ap_64bit.htm#CHDGFJJD
The DB is for SAP on a 8CPU/48 core IBM x3950. For some reason SAP documentation does not mention anything about this registry setting or even if Large Page Size is supported in the SAP world.
Part 2 : I notice that more recent Oracle patch sets (example 25) turn NUMA OFF by default. Why is this and what is the impact of disabling NUMA on a system like x3950 (which is a NUMA based server)?
My understanding is Oracle would no longer know that some memory is Local (and therefore fast) and some memory is Remote (therefore slow). Overall I am guessing this could cause a real performance issue on this DB.
-points for detailed reply!
thanks a lot -

Hello
Thanks for your reply. I am very interested to hear further about the limitations of Windows 2008 and the benefits of Oracle Linux.
Generally we find that Windows 2008 has been pretty good, a big improvement over Windows 2003 (bluescreens don't occur ever etc)
Can you advise further about Large Page Size for the buffer cache? I assume this applies on both Windows and Linux (I am guessing there is a similiar parameter for 10gR2 on Linux).
SAP have not yet fully supported Oracle 11g so this is why 11g has not made it into the SAP world yet.
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Thanks

RAC windows 2003 64bit xeon - Large Pages

Hi all
i have 2 node (windows 2003 64bit dual core xeon, 8GB RAM)
oracle recommendet use large pages on 64bit insted LOCK_SGA, but when i use large pages and i set my sga_target=5GB after few minute in EM i see alert (stronicowanie virtual memory) i dont knew how i can write this, mayby swapping.
how can avoid this?
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meyby some intresting links?
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You don't run a scalability option on a basically unscabable O/S like Winblows, do you?
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Windows 7 - Large Pages

While I was performing some benchmarks on my W520, I became aware that there is a function in Windows 7 called Large Pages. Essentially setting this policy for either a single user or a group greatly reduces the TLB overhead when translating memory addresses for applications in storage. The normal page size is 4KB. Large Pages sets the page size to be 2MB. The smaller number was useful when there was only a relatively small physical memory space available in the system (Windows 95, etc). However, as the addressable physical page space becomes larger, the overhead for translating addresses across page boundaries starts to be significant. Linux has an equivalent function.
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<----------------
The memory bandwidth benchmark using SiSoftware Sandra 2012 showed a performance increase of 2.04% for normal operations and a 2.9% increase for floating point operations. This was with only one user enabled. Enabling all users in the system brought an additional .5% performance increase. PCMARK7 also showed a corresponding increase in benchmark performance numbers.
Thanks to Huberth for pointing me into the SiSoftware Sandra 2012 benchmarking software and the memory bandwidth warning.
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Integer Memory Bandwidth
Assignment : 16.91GB/s
Scaling : 17GB/s
Addition : 16.75GB/s
Triad : 16.72GB/s
Data Item Size : 16bytes
Buffering Used : Yes
Offset Displacement : Yes
Bandwidth Efficiency : 80.36%
Float Memory Bandwidth
Assignment : 16.91GB/s
Scaling : 17GB/s
Addition : 16.73GB/s
Triad : 16.74GB/s
Data Item Size : 16bytes
Buffering Used : Yes
Offset Displacement : Yes
Bandwidth Efficiency : 80.34%
Benchmark Status
Result ID : Intel Core (Sandy Bridge) Mobile DRAM Controller (Integrated Graphics); 2x 16GB Crucial CT102464BF1339M16 DDR3 SO-DIMM (1.33GHz 128-bit) PC3-10700 (9-9-9-24 4-33-10-5)
Computer : Lenovo 4270CTO ThinkPad W520
Platform Compliance : x64
Total Memory : 31.89GB
Memory Used by Test : 16GB
No. Threads : 4
Processor Affinity : U0-C0T0 U2-C1T0 U4-C2T0 U6-C3T0
System Timer : 2.24MHz
Page Size : 2MB
W520, i7-2820QM, BIOS 1.42, 1920x1080 FHD, 32 GB RAM, 2000M NVIDIA GPU, Samsung 850 Pro 1TB SSD, Crucial M550 mSata 512GB, WD 2TB USB 3.0, eSata Plextor PX-LB950UE BluRay
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How to use large pages in AIX with oracle

Hi,
i'm trying to convince oracle to use large pages on AIX 5.3 but haven't
suceeded so far.
i set v_pinshm=1, maxpin%=80, lgpg_regions=448 and lgpg_size=16777216
using 'vmo' and 'LOCK_SGA=true' in spfile. after rebooting and starting
the instance 'svmon' shows no no large pages in use:
# svmon
size inuse free pin virtual
memory 4046848 3711708 335140 2911845 1503108
pg space 524288 5551
work pers clnt lpage
pin 1076604 0 233 1835008
in use 1503010 0 373690 0
pgsize size free
lpage pool 16 MB 448 448
SGA size is 3G. why doesn't oracle use large pages? i already have
created a TAR but maybe an oracle-on-AIX expert can help me faster than
oracle support :)
regards,
-ap

Nice day Andreas,
please do you have some solution for your issue, because I think I have similar problem,
I set on AIX
vmo -r -o lgpg_regions=192 -o lgpg_size=16777216
vmo -o v_pinshm=1
I see in svmon -G this output
PageSize PoolSize inuse pgsp pin virtual
s 4 KB - 1104431 2456 685141 874874
L 16 MB 192 0 0 192 0
these (16MB large pages) are free but when I want run BEA WebLogic server run with parametr -Xlp the application is run with standard 4K memory pages,
thank you very much for any other hint,

Error: Java HotSpot(TM) 64-Bit Server VM warning: JVM cannot use large page

Hi,
i recently came across Error Message (coming up in webadmin Log view):
ProcessMonitor: Java HotSpot(TM) 64-Bit Server VM warning: JVM cannot use large page memory because it does not have enough privilege to lock pages in memory
when running Oracle NoSQL on Windows 7 64bit Home Premium system, having 8GB of physical RAM.
I created the store configuration without explicitly passing a value for parameter memory_mb (was set to -memory_mb 0), so that replication group would take as much
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After searching google with error message mentioned above i came across some hints regarding activation of Huge Pages on Windows 7, which mentioned that it could be
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Charles,
thanks for clarification, obviously i've overseen that in chapter "Installation prerequisites" of
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HI Experts
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What is the expected downtime duration ?
What is the database size ?
For a "small" database with no downtime constraint you could use Data Pump to move data.
For a "large" database with minimum downtime you could use Oracle Streams (with Enterprise Edition) or Golden Gate (separate product: needs new licensing).
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http://www.oracle.com/technetwork/products/upgrade/index.html
Edited by: P. Forstmann on 22 mars 2013 13:03

Problem with Page properties window

In Page properties window,the window is too small some part
are invisible,example: in apearance i cant access right
margin,bottom margin,page font exept if i use tab,but i cant see
what i type in the box.Where I can post picture coz picture is
milion words?Please help me.

Page Properties is not resizable. Sounds like the user has
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Murray --- ICQ 71997575
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==================
http://www.projectseven.com/go
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http://www.dwfaq.com - DW FAQs,
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==================
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>
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Total Shared Global Region in Large Pages = 0 KB (0%)

Hi ,
Am working on Oracle Database 11.2.0.3 ,
Application 12.1.3.
i see this message in the alert log file :
****************** Large Pages Information *****************
Total Shared Global Region in Large Pages = 0 KB (0%)
Large Pages used by this instance: 0 (0 KB)
Large Pages unused system wide = 0 (0 KB) (alloc incr 32 MB)
Large Pages configured system wide = 0 (0 KB)
Large Page size = 2048 KB
RECOMMENDATION:
Total Shared Global Region size is 12 GB. For optimal performance,
prior to the next instance restart increase the number
of unused Large Pages by atleast 6145 2048 KB Large Pages (12 GB)
system wide to get 100% of the Shared
Global Region allocated with Large pages
What should i do ?
Thanks

You definitely are not using hugepagesd. That's what the message you mentioned above is telling you:
Total Shared Global Region in Large Pages = 0 KB (0%)It very clearly tells you that you have 0KB or 0% is in large pages.
Note that the terms "large pages" and "hugepages" are synonymous. In Linux, they're called hugepages.
Also, at the O/S level, you can do:
cat /proc/meminfoTo see how many hugepages are allocated/free/reserved.
Hope that helps,
-Mark

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Large Pages setting

Hello all,
We recently created a new 11.2.0.3 database on Red Hat Linux 5.7. It's running in ASMM
Database settings
sga_target set to 10G
sga_max=12G
memory_target=0.
memory_max=0
pga_aggregate_target =12G.
Host Specs
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Total CPUs = 4 @ 2.27GHz
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****************** Large Pages Information *****************
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Large Pages used by this instance: 0 (0 KB)
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Total Shared Global Region size is 12 GB. For optimal performance,
prior to the next instance restart increase the number
of unused Large Pages by atleast 6145 2048 KB Large Pages (12 GB)
system wide to get 100% of the Shared
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Large Pages Information in the Alert Log [ID 1392543.1]
USE_LARGE_PAGES To Enable HugePages In 11.2 [ID 1392497.1]
NOTE:361323.1 - HugePages on Linux: What It Is... and What It Is Not...
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http://agorbyk.wordpress.com/2012/02/19/oracle-11-2-0-3-and-hugepages-allocation/
http://kevinclosson.wordpress.com/category/use_large_pages/
http://kevinclosson.wordpress.com/category/oracle-automatic-memory-management/

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How can I make my PDF open to "Fit One Full Page to Window" by default regardless of who is opening it?

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Large pages in Windows / Oracle

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