Shared Memory and Memory Paging - VDI 3.2
Hello
What metrics have been identified in the performance and optimisation of these new features for VDI 3.2 ?
We are looking for substantiated indicators with respect to builds for sites of various user-base sizes v's SunRays on desks.
Regards
Jeremy.
good Question!
Also I'm confused of how much memory is really used and what is shown where (top vs. Desktop provider Info in VDI Admin vs. what I see/assigned in the VDesktop)
sometimes balooning works like a charm and I can overcommit lots of memory running several desktops. Other times running one single Win7 Desktop (1GB RAM assigned) on a SF4140 /w 8G Ram installed eats up 75% of my memory.
Right now the Win7 VDesktop I'm using has
1024 MB assigned by the VDI-Manager with 50% memory sharing
The manager displays ~ 3,8 GB Used, as the Win7 VBox is the only one Running in an All-in-One configuration and takes roughly 2.2-2.5 GB w/o a running VM, I assume that 1.2 or 1.3 is accounting on the Win7 Wbox
in top the VBoxHeadless process shows up with 1891MB memory usage
Which one to trust? Somewhat hard to forecast.
could someone shed some light on this?
Regards,
zoltan
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Class Data Sharing (CDS) and memory analys with pmap
Hi everybody,
I read that CDS can decrease the memory footprint by sharing some librairies.
I did some tests on PowerPC board and embeddedJVM 1.5 with 128Mo ROM
I wrote a HelloWorld with a sleep(10) and see the results :
# java -Xshare:off HelloWorld
mapped: 172568 KB writable/private: 165708 KB shared: 32 KB
# java -Xshare:on HelloWorld
mapped: 201112 KB writable/private: 188604 KB shared: 5680 KBThe shared memory increase, normal...
The memory mapped and writable/private increase, I thought that memory will decrease...
so, where is the benefits ?
And the mapped memory is > to board memory ! why ?
thanks for your help
Obelixsomebody can do this tests please :
Write a HelloWord.java with a sleep() of 10s and execute this scripts :
#!/bin/sh
java -version >> testsCDSoff.txt 2>&1
java -Xshare:off HelloWorld &
PID=$!
sleep 2
pmap -d $PID | grep mapped >> testsCDSoff.txt
java -Xshare:off HelloWorld &
PID=$!
sleep 2
pmap -d $PID | grep mapped >> testsCDSoff.txt
java -Xshare:off HelloWorld &
PID=$!
sleep 2
pmap -d $PID | grep mapped >> testsCDSoff.txtand
#!/bin/sh
java -version >> testsCDSon.txt 2>&1
java -Xshare:on HelloWorld &
PID=$!
sleep 2
pmap -d $PID | grep mapped >> testsCDSon.txt
java -Xshare:on HelloWorld &
PID=$!
sleep 2
pmap -d $PID | grep mapped >> testsCDSon.txt
java -Xshare:on HelloWorld &
PID=$!
sleep 2
pmap -d $PID | grep mapped >> testsCDSon.txtand then dump testsCDSoff.txt and testsCDSon.txt here :D
Look at mines :
testsCDSoff.txt
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)
mapped: 237220K writeable/private: 186972K shared: 44740K
mapped: 237220K writeable/private: 186972K shared: 44740K
mapped: 237220K writeable/private: 186972K shared: 44740K
testsCDSon.txt
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)
mapped: 265808K writeable/private: 210252K shared: 50048K
mapped: 265808K writeable/private: 210252K shared: 50048K
mapped: 265808K writeable/private: 210252K shared: 50048Kwhere is the benefits ? I did an error somewhere or I don't understand CDS ? -
SAP ECC6 memory and paging issues
Dear Experts
I have recently upgraded my 4.6C systems to an ECC 6 system (DB2 LUW 9.5 on AIX 5.3 TL9 64 Bit OS)
I have been running the LPAR with 14 GB of memory and we are around 100-200+ users using the system, I was monitoring using nmon and found that Physical Memory was around 99.8% Used (14311.8MB and 22.6MB was free) also the paging space was around 37.2% in result causing the system at times to run slow which can have a very negative effect on the users.
After further investigation I found that after a system restart the Physical Memory would start around 50.9% and increased at a steady pace until it reached 99.8% that is when the system would start using the paging space which would steadily increase, I found that the only solution was a system restart at least once a week to reduce the memory consumption.
At first glance it looked like a database manger memory leak with the process db2sysc, so I searched the net with the search words u201Cdb2 memory leaku201D and found the following APARs and notes.
APAR JR30285 - Pervasive memory leak when compiling SQL statements that use SQL/XML functions
APAR IZ35230 - There is a pervasive unix-specific private memory leak in the security component
Note 1288341 - Memory leak in APPLHEAPSZ -> SQL0954C
Note 1352361 - Memory leak in shared memory area abrfci
Note 1147821 - DB6: Known Errors and available Fixes in DB2 9.5 LUW
After reading the notes and APARs I decided to updated DB2 to the latest fix pack (5SAP), but after the fix pack was implemented it did not solve the memory problem
I started look at different problems with SAP ECC6, db2 and AIX with paging/memory problems and I found the following notes to do with AIX memory and paging but none of them helped as all parameters and settings were set accordingly
789477 - Large extended memory on AIX (64-bit) as of Kernel 6.20
191801 - AIX 64-bit with very large amount of Extended Memory
973227 - AIX Virtual Memory Management: Tuning Recommendations
884393 - AIX saposcol consumes large amount of memory.
856848 u2013 AIX Extended Memory Disclaiming
1048686 u2013 Recommended AIX settings for SAP
1121904 u2013 SAP on AIX: Recommendations for Paging
1086130 u2013 DB6: DB2 Standard Parameter Settings
After even more investigation I found the following evidence suggesting AIX Virtual Memory Manager might have a problemShared memories inside of pool 40
Key: 42 Size: 17792992 ( 17.0 MB) DB TTAB buffer
Key: 43 Size: 53606392 ( 51.1 MB) DB FTAB buffer
Key: 44 Size: 8550392 ( 8.2 MB) DB IREC buffer
Key: 45 Size: 7014392 ( 6.7 MB) DB short nametab buffer
Key: 46 Size: 20480 ( 0.0 MB) DB sync table
Key: 47 Size: 10241024 ( 9.8 MB) DB CUA buffer
Key: 48 Size: 300000 ( 0.3 MB) Number range buffer
Key: 49 Size: 2769392 ( 2.6 MB) Spool admin (SpoolWP+DiaWP)
Shared memories outside of pools
Key: 3 Size: 114048000 ( 108.8 MB) Disp. communication areas
Key: 4 Size: 523048 ( 0.5 MB) statistic area
Key: 6 Size: 692224000 ( 660.2 MB) ABAP program buffer
Key: 7 Size: 14838 ( 0.0 MB) Update task administration
Key: 8 Size: 134217828 ( 128.0 MB) Paging buffer
Key: 9 Size: 134217828 ( 128.0 MB) Roll buffer
Key: 18 Size: 1835108 ( 1.7 MB) Paging adminitration
Key: 19 Size: 119850000 ( 114.3 MB) Table-buffer
Key: 41 Size: 25010000 ( 23.9 MB) DB statistics buffer
Key: 63 Size: 409600 ( 0.4 MB) ICMAN shared memory
Key: 64 Size: 4202496 ( 4.0 MB) Online Text Repository Buf.
Key: 65 Size: 4202496 ( 4.0 MB) Export/Import Shared Memory
Key: 1002 Size: 400000 ( 0.4 MB) Performance monitoring V01.0
Key: 58900114 Size: 4096 ( 0.0 MB) SCSA area
Nr of operating system shared memory segments: 16
Shared memory resource requirements estimated
================================================================
Total Nr of shared segments required.....: 16
System-imposed number of shared memories.: 1000
Shared memory segment size required min..: 692224000 ( 660.2 MB)
System-imposed maximum segment size......: 35184372088832 (33554432.0 MB)
Swap space requirements estimated
================================================
Shared memory....................: 1654.8 MB
..in pool 10 328.6 MB, 58% used
..in pool 40 143.3 MB, 30% used
..not in pool: 1174.1 MB
Processes........................: 413.4 MB
Extended Memory .................: 6144.0 MB
Total, minimum requirement.......: 8212.2 MB
Process local heaps, worst case..: 3814.7 MB
Total, worst case requirement....: 21882.9 MB
Errors detected..................: 0
Warnings detected................: 3 -
I know in SAP's world, memory means physical memory + paging. I want to know which program has contribution for swap.
Suppose there is 4G physical memory on an application server, em/initial_size_MB = 4G, abap/heap_area_nondia = 4G.
1) If there is no dialog processor running and one background job running which claims 2G memory, I want to know will swap occur?
2) If there is one dialog processor running which claims 2G memory and one background job running which claims 2G memory, will swap occur?By ST03N you can check the workload, by OS06 the swap .
By transaction ST02 you can check the folllowing parameters:
SAP Roll area parameters
- ztta/roll_first : First amount of roll area used in a dialog WP
- ztta/roll_area : size of the local SAP Roll area in the work process
rdisp/ROLL_SHM : size of SAP roll Buffer
rdisp/ROLL_MAXFS : size of entire shared SAP roll area
SAP Extended Memory main parameters :
em/initial_size_MB : size of SAP extended memory allocated when the SAP instance starts up
em/blocksize_KB : size block which split SAP Extended Memory
ztta/roll_extension : maximum size of a user context in the SAP Extended memory
SAP Heap Memory main parameters :
abap/heap_area_dia : quotas oh SAP heap memory that a dialog process can allocated.
abap/heap_area_nondia : quotas oh SAP heap memory that a nondialog process can allocated.
abap/heap_area_total : size that can be allocated in total by all work process.
abap/heaplimit : Workprocess restart limit of heap memory
if helpful reward point is appreciated -
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Question 2 / Plan B: If plan A won't work out, i definitely don't wanna do this all over again because i took centuries and effort on this. What im trying to do is divide them to multiple projects, and maybe it will let me upload it because of it's file size? So how do i copy parts from a project and paste it to another project or event library so it would be easier for me to finish it in iMovie?
Question 3 / Plan C: If plan B won't work out, how do you screen record my movie with audio? What im trying to do is to record it by screen using quicktime and divide them by parts. I know how quicktime and soundflower works, but when i tried it, but the problem is that soundflower and quicktime audio was very crappy and broken at some point. So how do i record good quality audio with screen recording?
Question 4 / Plan D: If plan C won't work out, i guess the worst way to do this is to record from my phone, its such a bitter idea but i want this to be published in good quality. i am so tired and i took so weeks finishing this project and the ending results just ****** me off. Id be glad if someone has an idea on this problem im occurring. Hope y'all people and mac experts understood on what im struggling about. leave a reply on those of you who might have an idea on solving this problem!When You select share, are you able to get either of these two windows?
First one is Export As
Second one is Save as QuickTime
I looked at earlier post and see You have 4GB RAM, maybe try a smaller format to convert it to,
then save it to file first before trying YouTube. -
SHARED MEMORY AND DATABASE MEMORY giving problem.
Hello Friends,
I am facing problem with EXPORT MEMORY and IMPORT MEMORY.
I have developed one program which will EXPORT the internal table and some variables to the memory.This program will call another program via background job. IMPORT memory used in another program to get the first program data.
This IMPORT command is working perfect in foreground. But it is not working in background.
So, I have reviewed couple of forums and I tried both SHARED MEMORY AND DATABASE MEMORY. But no use. Still background is giving problem.
When I remove VIA JOB parameter in the SUBMIT statement it is working. But i need to execute this program in background via background job. Please help me . what should I do?
pls find the below code of mine.
option1
EXPORT TAB = ITAB
TO DATABASE indx(Z1)
FROM w_indx
CLIENT sy-mandt
ID 'XYZ'.
option2
EXPORT ITAB FROM ITAB
TO SHARED MEMORY indx(Z1)
FROM w_indx
CLIENT sy-mandt
ID 'XYZ'.
SUBMIT ZPROG2 TO SAP-SPOOL
SPOOL PARAMETERS print_parameters
WITHOUT SPOOL DYNPRO
*_VIA JOB name NUMBER number*_
AND RETURN.
===
Hope every bidy understood the problem.
my sincere request is ... pls post only relavent answer. do not post dummy answer for points.
Thanks
RaghuHi.
You can not exchange data between your programs using ABAP memory, because this memory is shared between objects within the same internal session.
When you call your report using VIA JOB, a new session is created.
Instead of using EXPORT and IMPORT to memory, put both programs into the same Function Group, and use global data objects of the _TOP include to exchange data.
Another option, is to use SPA/GPA parameters (SET PARAMETER ID / GET PARAMETER ID), because SAP memory it is available between all open sessions. Of course, it depends on wich type of data you want to export.
Hope it was helpful,
Kind regards.
F.S.A. -
Dear developers,
I have some documentation on ABAP SHARED OBJECTS and I wonder how I could define shared memory objects at run time ( so I would need something like an API ) instead of using the SHMA transaction.
I actually also wonder what would happen if 2 users of the same shared object would call on one of its methods ? Can we have concurrent access ? How does the whole locking thing works ? Is it possible to implement waiting calls/locks ?
If you have any serious/technical documentation on semaphores/locks in SAP/ABAP I'd also be very interested.
Sincerely,
Olivier MATTHi matt,
This is vijay here.
if you r working on frequntly changed data then you must use this locking technique.
well jus go to se11 and make a lock object by starting initial......EZ....
EX: EZENMARA.
then u can fix the lock as shared or (exclusive,cumulative) or( exclusive, not cumulative)
you can also fix the lock parameters like specific fields.then jus save and activate.
and when you will make a program jus call the function module enqueue_ezenmara for locking and dequeue_ezenmara for unlocking and u can get rest in my program.
regards
vijay
rewards if answer is helpfull.
TABLES: MARA.
PARAMETER: MATNR LIKE MARA-MATNR.
CALL FUNCTION 'ENQUEUE_EZENMARA'
EXPORTING
MODE_MARA = 'S'
MANDT = SY-MANDT
MATNR =
X_MATNR = 'MATNR'
_SCOPE = '2'
_WAIT = ' '
_COLLECT = ' '
EXCEPTIONS
FOREIGN_LOCK = 1
SYSTEM_FAILURE = 2
OTHERS = 3
IF SY-SUBRC = 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
WRITE: 'TABLE IS LOCKED'.
ELSE.
SELECT * FROM MARA WHERE MATNR = MATNR.
WRITE:/ MARA-MATNR,MARA-ERNAM,MARA-MTART.
ENDSELECT.
ENDIF. -
Hi ,
I want to setup hyper-v host with 128 GB RAM , Windows 2012 R2
What is recommended size of System drive to keep operating system files , paging files and Memory Dump?
I tested to using 150 GB , but when the server is crashed, there is no free space to keep memory dump file.
RamyHi Ramy,
For Server 2012R2 the absolute minimum system drive is 32Gb but this assume you have limited RAM or have your Page file located on another drive. It used to be best practice to setup a small page file but MS PFE now suggest leaving windows to manage
the page file size.
Obviously this is not always possible depending on the amount of RAM in the system, but base the system drive around this or offload the Page file to perhaps another drive. On top of this you also need space for the memory dump to be written, potentially
again up to the size of the RAM. Assuming you fire the machine back up after a crash, you need space for the OS, the Page File plus space for the associated dump file.
There is a nice little article here that maybe of assistance: http://social.technet.microsoft.com/wiki/contents/articles/13383.best-practices-for-page-file-and-minimum-drive-size-for-os-partition-on-windows-servers.aspx
Kind Regards
Michael Coutanche
Blog:
Twitter: LinkedIn:
Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose. -
(SOLVED)fork() and memory sharing?
Let me get this straight, when you fork() a child process this is what happens:
A copy of the parent isn't made just yet-- instead the child has read only rights to the actual parent's memory page. Once the child executes a write call the stack and heap pages are copied and marked with read and write rights.
Questions:
What happens to the shared memory segments? Is this section shared prior and post to the copy/RW escalation? How does the stack, heap and shared memory segments differ?
Last edited by Google (2010-08-25 16:01:17)Think of shared memory segments as their own entitites, truly separate from the process that created them. They aren't copied during fork() because they are not technically part of the process's address space.
A pointer to the shared memory segment may be copied if one exists before you fork, which would allow the child to access the segment created by the parent, but the segment itself is ... well it's shared -
Segment memory and shared memory
hi guys
is it possible to know the path of "Segment memory and shared memory " on OS level...........
i don't know exact forum for this question so i post it here
please help me !If are you using Linux you can use ipcs to get all shared memory segments at system level:
$ ipcs -m
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x0000f47a 65536 root 777 512000 4
0x26278554 163842 oracle 640 132120576 16
0xac004cf0 196611 oracle 660 16108224512 128The Oracle executable sysresv uses ORACLE_SID env. var to map shared memory segment to the current instance:
$ sysresv
IPC Resources for ORACLE_SID "XXX1" :
Shared Memory:
ID KEY
196611 0xac004cf0
Semaphores:
ID KEY
229377 0x2dac12a4
Oracle Instance alive for sid "XXX1" -
Contribute "low on memory" and Acrobat won't redraw
I have two issues that I believe may be related. First here's my system information
WinXP SP3
Intel Core2Duo E6550 = (2.33GHz)
3GB RAM
GeForce 8600GTS 512 MB Video
Running two 19" monitors, (at 1440x900 each)
Creative Suite Premium 2.0 (InDesign CS2, Photoshop CS2, IllustratorCS2, Acrobat 7 Professional, BridgeCS2, GoLive CS2Version Cue is disabled.)
Production Studio Premium 1.0 (Premiere Pro 2, Encore DVD 2, After Effects 7, Audition 2)
Contribute CS3, (including Bridge CS3, but I don't use it, I use Bridge CS2 for everything).
First Issue. Intermittently, in both Adobe Reader 9, and Acrobat 7.0 pdf files that I have open will not display in the window properly, unless I reduce the size of the window to something quite small. It will show the desktop in behind the window, or if I open a window on top, it shows that window even when I've moved it.
The second problem is similar, but occurs in Contribute CS3 and is always accompanied by a "Your system is low on memory..." error, until I reduce the size of the Contribute window, at which point, it is so small that it becomes unuseable.
The only other program that I have open at the time is Outlook 2007, with a couple of messages.
As this is happening, I open the Task Manager, see that there is plenty of available Physical Memory, and the CPU Usage is very low, under 10%. I've set my virtual memory paging file to Custom Size of 4591MB.
The only way to fix it is to reduce the size of windows or close all the programs. These two problems occur independently of each other. Sometimes when I'm just trying to open a PDF file.
3GB should be plenty to run Contribute and Outlook, or Acrobat and Bridge.
What the heck is going on?Thanks for the reply.
Yes I have tried that, but to no avail. The crazy thing is that it only really happens after I've been working in Contribute for a while. Sometimes an hour or more. Then it just starts doing this.
The redraw problem also affects other programs, that are not Adobe programs. For example, when I open a Remote Desktop Connection to the web server where I am publishing, while this problem is occuring, the screen will not "draw" properly either.
I have a feeling that there is something strange about how Contribute, and Acrobat, and Windows share the memory, either the system memory, or the graphics memory.
Could this also be a problem caused by having both CS2 and CS3 programs installed?
Chris -
So our customer has asked us to compare compare Amazon Workspace and Azure RemoteApp offerings for them to choose from. While looking at Amazon Workspace, it clealy defines bundles with specific CPU cores, memory and user storage. However, Azure RemoteApp
only specifies user storage and vaguely compares its basic vs. standard plans in terms of "task worker" vs. "information worker"
I tried looking up its documentation but couldn't find specific CPU cores that are dedicated per user in basic vs. standard plans. I have following questions:
Can anyone point me in the right direction or help understand how many CPU cores and memory are dedicated (or shared) per user in each plan?
Our customer would most likely need a "custom" image for their custom apps. Is it possible for us to choose specific CPU cores and memory for the users to be able to run their apps in azure remoteapp?
In case i am misunderstanding the basic difference between AWS workspace and Azure RemoteApp, i'd appreciate some help in understanding it as well.
Thanks!Hi,
With Azure RemoteApp users see just the applications themselves, and the applications appear to be running on their local machine similar to other programs. With Workspaces users connect to a full desktop and launch applications within that.
1. Azure RemoteApp currently uses size A3 Virtual Machines, which have 4 vCPUs and 7GB RAM. Under Basic each VM can have a maximum of 16 users using it whereas under Standard each VM is limited to 10 users. The amount of CPU available
to a user depends on what the current demands are on the CPU at that moment from other users and system processes that may be on the server.
For example, say a user is logged on to a VM with 3 other users and the other users are idle (not consuming any CPU). At that moment the user could use all 4 vCPUs if a program they are running needed to. If a few moments later
the other 3 users all needed lots of CPU as well, then the first user would only have approximately 1 vCPU for their use. The process is dynamic and seeks to give each user their fair share of available CPU when there are multiple users demanding CPU.
Under the Standard plan a user will receive approximately a minimum of .4 vCPU assuming that the VM has the maximum number of users logged on and that all users are using as much CPU as possible at a given moment. Under the Basic plan the approximate
minimum would be .25 vCPU.
2. You cannot choose the specific number of cores and memory. What you can do is choose the Azure RemoteApp billing plan, which affects the user density of each VM as described above. If you need a lower density than Standard you
may contact support.
-TP -
I have:
MS 6390 LE w/ lan v 1.00
AMD XP 1700 w/hsf
30G WD hard drive 5400rpm
128 M ddr266 memory
Antec case with an Antec sl300 PSU
floppy
zip 100
MS 8348 Dragonwriter CD RW(currently not working yet, but am working on that too)
Everything seems to be working, and I flashed the bios to the current version not for the pcb 2.0, and I have this question,
When booting up the memory test only shows 98 m memory and 32+ shared memory. After it boots up, and I am in Windows 98se, it only shows 96 m memory and the system is at 70%.
Have I done something wrong, or is there something else wrong? The machine doesn't seem to run as fast as I would expect it to, but then the HD is a slower model. And I can't get the cd rw to work, but that is a different problem i posted to another forum.
Thanks!No, it doesn't appear that you have done anything wrong. You do have 128mb (96+32=128). The reason for the bios showing 98mb and windows showing 96 is in how it counts megabytes. Windows see's megabytes as 1 000kb. Your bios see's mb's as 2^10=1024kb. This accounts for the discrepancy you see when you boot up and your 128mb stick is seen as 131mb.
As for system resources, you only have 96 mb RAM available for Windows. Add up what you have running in the background as well as what Windows normally needs and you're about right. -
?( I have KT3 Ultra with 512meg 2x 256 in Sockets 1 and 2.
XP home and Athlon XP1800 I am trying to increase the RAM with another 256 in socket 3.
When there is a module in the 3rd socket the machine will crash. I have tried 3 different memory modules and even taken out the existing memory and swapped modules around but it will still crash. Sometimes it takes a couple of hours to crash and others it will happen on powering up. Today this is what the blue screen message said .
Problem with WIN32K.sys page fault in non paged area
It will crash during any software it doesnt seem fussy
Word, Photoshop IE6 whatever
Anybody have any ideas or advice where to go ?
TIAare all 3 tottally identical maker revision etc
mixed never seem to work
try less agressive ram timmings
some times 3 just will not work is what ive seen
more ram draws more power is a possible reason -
Performance and memory problems
Hello.
I've installed Oracle AS 10g in Redhat Linux EL 3. The machine has 3 GB of memory, 2 GB of swap. Its a dual Xeon 2.6 Ghz.
Imagine i reboot the machine. Everything works fine. The problem is, in 6 days, it fills all the swap memory and almost the memory available. If it reaches this values, the machine gets so slow... To correct temporary the situation, i need to perform a reboot. But the question is this is Linux, not windows...
Does anyone has an ideia why this is happening?? i've never seen something like this... after 6 days, the only memory available of 5 GB are 30 MB... this is not possible.
Help please !We are with the same problem. We read a lot about the vm in the RHAS 3.0. The vm was improved but, with bugs. We found a lot of inactive pages that, after the clean state, does'nt deallocate properly. This makes the thread kernel "kswapd" works a lot, taking all the cpu in the io process.
There is a known bug related to "kswapd" thread in the RHAS 3.0 kernel. The RedHat promess to solve the problem in the nexts releases (I really doubt it, because there was already 3 releases after its announces).
We have checked some strange behaviors too... The machines with Linux RH AS 3.0 + Oracle products (OracleDB and OracleIAS) are freezing randomically. We think that the shared memory are allocating kernel space pages, but we didn't found any evidences yet.
The workarounds (not tested yet):
- Upgrade to the latest kernel.
or
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or
- Compiling a clean kernel directly from kernel.org. In this case, we don't have support from Oracle, but maybe the problem could be resolved until RH publish some bugless vm code with your kernel.
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