When is shared memory used?

I understand that two JVM's both running Coherence on the same box will generally but not always communicate through shared memory, rather than via the network.
Can you indicate under which scenarios this occurs, and by implication, which scenarios it does not occur?

Hi Andy,
Coherence 1.x/2.x always uses a network interface (UDP unicast/multicast) for inter-JVM communication. However, the OS network stack may internally use shared memory for intra-machine communication.
Jon Purdy
Tangosol, Inc.

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Shared memory used in Web Dynpro ABAP

Hi Gurus,
I am using shared memory objects in Web Dynpro ABAP. Everything was working fine until we went live to production. After some research I realized that users are not always able to reach data in shared memory because of different approach of web environment and classic GUI when using more servers. Solution would be to go to database instead of shared memory. However I am still interested if there might be some other way to solve it. Any ideas?

Marek Veverka wrote:
Hi Gurus,
>
> I am using shared memory objects in Web Dynpro ABAP. Everything was working fine until we went live to production. After some research I realized that users are not always able to reach data in shared memory because of different approach of web environment and classic GUI when using more servers. Solution would be to go to database instead of shared memory. However I am still interested if there might be some other way to solve it. Any ideas?
To my understanding writing to the database is the safe option. There are no other ways to solve your problem with Shared memory.

Resetting shutdown time when file sharing in use

I have a MBP connected to iMac via file sharing. When I want to shut down the iMac, it warns me that a user is connected via file sharing. In the past, I had an option to select how long to wait. The default was 10 minutes. I no longer get that option. How can reset the system to get the 10 minute (or as specified by the user) option again? Thanks, Paul (10.6.4)

Hello Sally,
Thank you for your interest.
I've gone through SAP note 12746.
I deleted the log file /usr/sap/trans/tmp/TQA.LOB after making sure that pid 640 which appeared in the old message in the tp system log did not exist. But this resulted in the message :
'WARNING: Cannot remove /usr/sap/trans/tmp/TQA.LOB : No such file or directory' to appear once in the tp system log and for a very long time.
I re-generated the transport profile file, and released a new transport from DEV to TQA, and tried to import this new request, and now the message in the tp system log is :
WARNING: /usr/sap/trans/tmp/DEVKK917158.TQA is already in use (20), I'm waiting 4 sec (20080516225456). My name: pid 663 on MASAPTQA', where DEVKK917158 is the transport request number generated from the DEV system.
pid 663 now corresponds to an active job (I used command WRKPID)
Any clues ?
Thank you for your cooperation.
Best regards.
Reda Khalifa

Play is interupted when home sharing or using air play.

When I use my Apple TV I have issues with home sharing. Movies will say they need many hours to download or when they start playing they will be interupted because they have not fully downloaded.
When using Air Play with another device I will get a similar message.
Any advice?

What you describe is a network issue.
Power cycle the router.
Connect the ATV via ethernet.
Move the router closer to the ATV.

CX_SHM_EXTERNAL_REFERENCE exc. when passing Class instance to Shared memory

Hi all,
when setting up the writing to a shared memory (using the SHMA and SHMM transactions), we get an exception mentioning CX_SHM_EXTERNAL_REFERENCE
This problem is raised because we are trying to move an instantiated class from the calling development to the Shared memory class.
Therefore, this exception is raised, the sap standard documentation tells me:
"There are still references from the current area instance version to a different area instance of the shared objects memory, or to the internal session."
How can we work around this problem, I really want to pass the instantiated class to the Shared memory?
Thanks in advance for any help,
Pascal Decock

My problem is that I would like to embed a Standard SAP class into this shared memory.
Therefore, I'm obliged to accept the 'Create object' references that are written in standard SAP code.
That also means that it is impossible to include an instantiated SAP class into a shared object memory?

Short Dump TSV_TNEW_PAGE_ALLOC_FAILED while using shared memory objects

Hi Gurus,
We are using shared memory objects to stor some data which we will be reading later. I have implemented the interfce IF_SHM_BUILD_INSTANCE in root class and using its method BUILD for automatic area structuring.
Today our developments moved from dev system to quality system, and while writing the data into the shared memory using the methods ATTACH_FOR_WRITE and DETACH_COMMIT in one report. We started getting the run time error TSV_TNEW_PAGE_ALLOC_FAILED.This is raised when the method DETACH_COMMIT is called to commit the changes in the shared memory.
Everyhting works fine before DETACH_COMMIT. I know that it is happening since the program ran out of extended memory, but I am not sure why it is happening at DETACH_COMMIT call. If excessive memory is being used in the program, this run time error should have been raised while calling the ATTACH_FOR_WRITE method or while filling the root class attributes. I am not sure why it is happening at DETACH_COMMIT method.
Many Thanks in advance.
Thanks,
Raveesh

Hi raveesh,
as Naimesh suggested: Probably system parameter for shared memory area is too small. Compare the system parameters in devel and QA, check what other shared memory areas are used.
Regarding your question, why it does not fail at ATTACH_FOR_WRITE but then on DETACH_COMMIT:
Probably ATTACH_FOR_WRITE will set an exclusive write lock on the shared memory data, then write to some kind of 'rollback' memory and DETACH_COMMIT will really put the data into shared memory area and release the lock. The 'rollback' memory is in the LUW's work memory which is much bigger as the usual shared memory size.
This is my assumption - don't know who can verify or reject it.
Regards,
Clemens

ORA-27101: shared memory realm does not exist AIX 5.3 Oracle 10.2 g

Hi everybody, please help!!!!!
I have a problem on my ERP, whe the users run reports called ZSD01, ZSD07 these programs exeed the lifetime period of 600 seconds and cause an ABAP - runtime error by time out.
using the TX ST22 I get a report indicating the folow:
C Attaching to DB Server R3P (con_hdl=0,svchp=0x114e60fa8,srvhp=0x1144295e8)
C     OCIServerAttach(OCI_DEFAULT) failed with SQL error 12537:
C     ORA-12537: TNS:connection closed
C *** ERROR => CONNECT failed with sql error '12537'
[dbsloci.c    11239
C     OCISessionBegin(OCI_DEFAULT) failed with SQL error 1034:
C     ORA-01034: ORACLE not available
C ORA-27101: shared memory realm does not exist
C IBM AIX RISC System/6000 Error: 2: No such file or directory
C Detaching from DB Server (con_hdl=0,svchp=0x114e60fa8,srvhp=0x1144295e8)
C *** ERROR => CONNECT failed with sql error '1034'
[dbsloci.c    11239]
My Oracle and SAP instances are runnig and this error occurs when on the report select a several sales offices and was oerating 'til last moth ago...
Thanks!!!!!!!!!!!!!!!
Regards,
Oscar D'Lima

Hi,
C ORA-12537: TNS:connection closed
C *** ERROR => CONNECT failed with sql error '12537'
[dbsloci.c 11239
C OCISessionBegin(OCI_DEFAULT) failed with SQL error 1034:
C ORA-01034: ORACLE not available
C ORA-27101: shared memory realm does not exist
C IBM AIX RISC System/6000 Error: 2: No such file or directory
C Detaching from DB Server (con_hdl=0,svchp=0x114e60fa8,srvhp=0x1144295e8)
C *** ERROR => CONNECT failed with sql error '1034'
The ORA-27101 error is generated when the shared memory key generated by the client does not match any currently existing keys. This is to be expected if the ORACLE_HOME or ORACLE_SID used by the client is not the same as that used when starting up the database.
Perform the following:
1) Check these environment variables and if required set them appropriately.
2) Review the listener.ora currently used to startup the listener and verify the ORACLE_HOME value is correct for all listed Oracle databases. If the ORACLE_HOME points to a different Oracle version then what was used when the database was created, then this error can occur.
3) Likewise, review the listener.ora currently used to startup the listener and verify the SID_NAME value is correct and has the right value (the SID_NAME is case sensitive).
Also check Metalink Doc ID: 167252.1 (ORA-27101: Shared Memory Realm Does Not Exist).
regards,
Subhajit.

Read & Write Shared memory with Java

Hi,
I have to read and write from/to shared memory four integers with Java, using Posix package (the shared memory is already created).
I've looking in google for any examples that attachs, read, and write to shared memory using that package but i couldn't find anything (that's the reason to write in this forum).
Posix package link
http://www.bmsi.com/java/posix/docs/Package-posix.html
Operative System
Suse 10
Could anyone help me with any example, please?
Thank you very much
Oscar

Hi, i can't post any code because i have no idea about posix and shared memory.
I came from web world and my company has send me to space department, two weeks ago, that use Unix as its operative system.
The first thing i have to do it's what i post but i don't know even how to start doing it, because this is almost the first time i hear about reading and writing shared memory.
Java is a high level and non-dependent platform (but this kind of things i think are dependent platform, in this case the opearative system) and it's few time since i am working with this operative system.
That's the trouble i don't know how to start working with this.
Thanks again

Showing warning message in memory use tab

when i check memory use under troubleshooting information
then their is a message of warning is shown as below
WARNING: the following values are negative or unreasonably large.
explicit/storage/sqlite/(15 tiny)
explicit/storage/sqlite/(15 tiny)/other
This indicates a defect in one or more memory reporters. The invalid values are highlighted.
why this message is shown?
is this warning can be removed ?

Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
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FATAL: shared memory region is being held at - Error when installing SAP with sapinst

Hi guys
This error is kinda odd since i have installed 3 systems under the same OS/DB Conditions
Windows 2012 R2 with ASE 15.7.
14GB Memory
30GB PageFile
Firewall Off
On the previous two systems, when executing a System Copy using an Export File it completed with no problems.
On this System Installation, during ASE Server Setup, SAPINST fails, checking ASE logs it seems releted to memory, but I cant figure out what is the problem since 14GB would be enough, and it never happened on the previous installations.
Any idea what could be causing this?
init logs.
Finished loading file 'charset.loc'.
03/13/15 06:23:20 AM End output from 'charset'.
03/13/15 06:23:20 AM Character set 'utf8' has been successfully installed.
03/13/15 06:23:20 AM Task succeeded: install a character set(s).
03/13/15 06:23:20 AM Running task: set the default character set and/or default
                     sort order for the Adaptive Server.
03/13/15 06:23:20 AM Setting the default character set to utf8
03/13/15 06:23:20 AM Sort order 'binary' has already been installed.
03/13/15 06:23:21 AM SQL command: exec sp_configure 'default character set id',
                     190, binary
03/13/15 06:23:21 AM SQL command: exec sp_configure 'default sortorder id', 25,
                     utf8
03/13/15 06:23:21 AM Sort order 'binary' has been successfully set to the
                     default.
03/13/15 06:23:23 AM SQL command: shutdown
03/13/15 06:23:25 AM Waiting 15 seconds for the operating system to reclaim
                     resources before rebooting.
03/13/15 06:23:45 AM Calling the shell with
                     '"J:\sybase\AEC\ASE-15_0\bin\sqlsrvr.exe"
                     -d"J:\sybase\AEC\sybsystem\master.dat" -sAEC
                     -e"J:\sybase\AEC\ASE-15_0\install\AEC.log"
                     -i"J:\sybase\AEC\ini" -M"J:\sybase\AEC\ASE-15_0" '.
03/13/15 06:23:55 AM Calling the shell with '0 = return code.'.
03/13/15 06:24:11 AM Calling the shell with
                     '"J:\sybase\AEC\ASE-15_0\bin\sqlsrvr.exe"
                     -d"J:\sybase\AEC\sybsystem\master.dat" -sAEC
                     -e"J:\sybase\AEC\ASE-15_0\install\AEC.log"
                     -i"J:\sybase\AEC\ini" -M"J:\sybase\AEC\ASE-15_0" '.
03/13/15 06:24:11 AM waiting for server 'AEC' to boot...
03/13/15 06:24:21 AM SERVER ERROR: Failed to boot server 'AEC'.
03/13/15 06:24:21 AM SERVER ERROR: Couldn't reboot server 'AEC' after changing
                     internal tables.
03/13/15 06:24:25 AM CONNECTIVITY ERROR: Open Client message: 'ct_connect():
                     network packet layer: internal net library error: Net-Lib
                     protocol driver call to connect two endpoints failed
                     Failed to connect to the server - Error is 10061 No
                     connection could be made because the target machine
                     actively refused it.
03/13/15 06:24:25 AM CONNECTIVITY ERROR: Initialization of auditinit
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03/13/15 06:24:25 AM Task failed: set the default character set and/or default
                     sort order for the Adaptive Server. Terminating
                     configuration.
03/13/15 06:24:25 AM Configuration failed.
03/13/15 06:24:25 AM Exiting.
03/13/15 06:24:25 AM The log file for this session is
                     'J:\sybase\AEC\ASE-15_0\init\logs\log0313.007'.
03/13/15 06:24:25 AM Log close.
Install Log
00:0000:00000:00000:2015/03/13 06:24:13.07 kernel SySAM: Using licenses from: J:\sybase\AEC\\SYSAM-2_0\licenses\SYBASE.lic;J:\sybase\AEC\\SYSAM-2_0\licenses\SYBASE_ASE_DE.lic
00:0000:00000:00000:2015/03/13 06:24:13.70 kernel SySAM: Checked out license for 2 ASE_CORE (2020.1231/permanent/100C 0F04 3F88 1821).
00:0000:00000:00000:2015/03/13 06:24:13.70 kernel This product is licensed to: SAP, for use with SAP Business Applications.
00:0000:00000:00000:2015/03/13 06:24:13.70 kernel Checked out license ASE_CORE
00:0000:00000:00000:2015/03/13 06:24:13.70 kernel Adaptive Server Enterprise (Enterprise Edition)
00:0000:00000:00000:2015/03/13 06:24:13.71 kernel Using config area from primary master device.
00:0000:00000:00000:2015/03/13 06:24:13.71 kernel Warning: Using default file 'J:\sybase\AEC\AEC.cfg' since a configuration file was not specified. Specify a configuration file name in the RUNSERVER file to avoid this message.
00:0000:00000:00000:2015/03/13 06:24:13.73 kernel Allocating a shared memory segment of size 131137536 bytes.
00:0000:00000:00000:2015/03/13 06:24:13.73 kernel WARNING: shared memory segment is being held by another application
00:0000:00000:00000:2015/03/13 06:24:13.75 kernel FATAL: shared memory region is being held at 131104768 bytes but 131137536 bytes are required
00:0000:00000:00000:2015/03/13 06:24:13.75 kernel kbcreate: couldn't create kernel region.
00:0000:00000:00000:2015/03/13 06:24:13.75 kernel kistartup: could not create shared memory
Best
Martin

After implementing solution in Note 2011550 - SYB: SAP ASE on Windows fails to start, issue was fixed

Using Shared Memory in LabVIEW

I'm trying to use shared memory with LabVIEW. Can I use it, a DLL in C with LabWIEW for use shared Memory?

Lidia,
Check these out (for memory mapping):
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000000080000006A1D0000&UCATEGORY_0=_318_&UCATEGORY_S=0&USEARCHCONTEXT_QUESTION_0=build+cvi+shared+dll&USEARCHCONTEXT_QUESTION_S=0
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000000080000005BC10000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0&USEARCHCONTEXT_QUESTION_0=Communicating+Between+Built+LV+App&USEARCHCONTEXT_QUESTION_S=0
But in general you don't need to use this when you use dll's. It is used to
share data between different processes. If you need LabVIEW data in a dll,
try to pass it as a pointer to an array, or as a string pointer.
Regards,
Wiebe.
"lidia" wrote in message
news:506500
[email protected]..
> I'm trying to use shared memory with LabVIEW. Can I use it, a DLL in C
> with LabWIEW for use shared Memory?

Cannot attach data store shared-memory segment using JDBC (TT0837)

I'm currently evaluating TimesTen during which I've encountered some problems.
All of the sudden my small Java app fails to connect to the TT data source.
Though I can still connect to the data source using ttisql.
Everything worked without problems until I started poking around in the ODBC administrator (Windows 2K).
I wanted to increase permanent data size so I changed some of the parameters.
After that my Java app fails to connect with the following message:
DriverManager.getConnection("jdbc:timesten:direct:dsn=rundata_tt60;OverWrite=0;threadsafe=1;durablecommits=0")
trying driver[className=com.timesten.jdbc.TimesTenDriver,com.timesten.jdbc.TimesTenDriver@addbf1]
SQLException: SQLState(08001) vendor code(837)
java.sql.SQLException: [TimesTen][TimesTen 6.0.4 ODBC Driver][TimesTen]TT0837: Cannot attach data store shared-memory segment, error 8 -- file "db.c", lineno 8846, procedure "sbDbConnect()"
The TT manual hasn't really provided any good explanation what the error code means.
Obviusly I'v already tried restoring the original ODBC parameters without any luck.
Ideas..anyone?
/Peter

Peter,
Not sure if you have resolved this issue or not. In any case, here are some information to look into.
- On Windows 32-bit, the allocation of shared data segment doesn't work the same way like on Unix and Linux. As a result, the maximum TimesTen database size one can allocate is much smaller on the Windows platform than on other platforms.
- Windows error 8 means ERROR_NOT_ENOUGH_MEMORY: not enough storage is available to process this command.
- TimesTen TT0837 says the system was unable to attach a shared memory segment during a data store creation or data store connection operation.
- What was the largest successful perm-size and temp-size you used when allocating the TimesTen database?
* One explanation for why you were able to connect using ttIsql is that it doesn't use much of the DLLs, whereas your Java application typically has a lot more DLLs.
* As a troubleshooting step, you can try reduce your Temp-size to a very small size and just see if you can connect to the data store. Eventually, you may need to reduce your perm-size to get Windows to fit the shared data segment in the process space.
By the way the TimesTen documentation has been modified to document this error as follows:
Unable to attach to a shared memory segment during a data store creation or data store connection operation.
You will receive this error if a process cannot attach to the shared memory segment for the data store.
On UNIX or Linux systems, the shmat call can fail due to one of:
- The application does not have access to the shared memory segment. In this case the system error code is EACCESS.
- The system cannot allocate memory to keep track of the allocation, or there is not enough data space to fit the segment. In this case the system error code is ENOMEM.
- The attach exceeds the system limit on the number of shared memory segments for the process. In this case the system error code is EMFILE.
It is possible that some UNIX or Linux systems will have additional possible causes for the error. The shmat man page lists the possibilities.
On Windows systems, the error could occur because of one of these reasons:
- Access denied
- The system has no handles available.
- The segment cannot be fit into the data section
Hope this helps.
-scheung

I want to use my icloud email address as a new apple ID. It was an additional email contact address I originally set up for my child. But now, I'd like to set her up on Family Sharing, using that email as her ID. Obviously, when I try to use it wh

I want to use one of my icloud email addresses as a new apple ID. It was an additional email contact address I originally set up for my child. But now, I'd like to set her up on Family Sharing, using that email as her ID. Obviously, when I try to use it when setting up a new apple ID, it says the email is already being used (Yes, by ME) and I need to select a different one. Can I somehow delete that email address in order to set up a new apple ID using it? Or is there another way to "re-use" that address for my child's new ID?

"Well, then I want to be able to merge that one and the one my purchases are on..."
This is exactly what I want to do but don't think I can:
I noticed the following :
If you attempt to create an Apple ID which is the same as your @icloud email address from the online facility, it does not allow you (can't use an Apple associated email address as your Apple ID). However - if you start a fresh device - such as a new iPhone, iPad (must be mobile it seems), and then create an iCloud account and Apple ID from the prompts when setting up the mobile device, it IS possible to have your Apple ID and @iCloud email address as the same. I know because I just did it!
Unfortunately for me, the result I got above is not for one of my own ID's but a friends, and I would VERY much like to do the same - my current Apple ID is a completely different email address from my iCloud account. Trying to get them the same in my situation is a major bother - I think that if I wipe a device (such as an iPhone5 that is mine) and try to setup as I did my friend's device, then I will get a conflict because the iCloud email I have ALREADY exists. This is my worry and I will not attempt this until I get the new iPad 4 soon to test this.
There is an inconsistency here between the two methods of creating Apple ID's and iCloud accounts.
Overall in my opinion, the Apple ID system as currently available from Apple is not designed very well, and should be addressed.
Best wishes -

High memory use when checking downloads folder through browser

High memory use when checking downloads folder through browser.
I have a total of 3 DDR2 Gbytes of ram. Pentium(R) Dual-Core CPU T4500 @ 2.30GHz Win 7 home pr. 64bit. Firefox 27.0 beta
I right click on a file to "open containing folder" from the drop down menu in downloads.
When the folder has been opened, explorer is trying to index the folder (which it never does completely or well after 5 minutes I close the folder and shut down the dllhost process cause laptop is blazing hot) and memory keeps increasing till no more is available.
I checked task manager and see that dllhost is the particular process that is causing the spike in memory usage even after closing the folder I right click and stop the process and memory is restored after awhile.

Hello,
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
* On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

Does anyone know how to display (in LabVIEW) the memory use during execution of an image and data acquisition VI to predict when it is time to cease the acquisition to prevent the program crashing?

Does anyone know how to display (in LabVIEW) the memory use during execution of an image and data acquisition VI to predict when it is time to cease the acquisition to prevent the program crashing?
I am acquiring images and data to a buffer on the edge of the while loop, and am finding that the crashing of the program is unpredictable, but almost always due to a memory saturation when the buffers gets too big.
I have attached the VI.
Thanks for the help
Attachments:
new_control_and_acquisition_program.vi ‏946 KB

Take a look at this document that discusses how to monitor IMAQ memory usage:
http://digital.ni.com/public.nsf/websearch/8C6E405861C60DE786256DB400755957
Hope this helps -
Julie

When is shared memory used?

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