Solving corrupt dynamic memory problem

Using LabWindows/CVI 2010, Windows XP. I have a data acquisition program that uses a rather large number of dynamically allocated arrays as buffers. The buffers are used to hold data from DAQmx and are passed and copied to a number of thread-safe queues and other routines. In certain circumstances, when I free one buffer I get a "dynamic memory is corrupt" error, which probably means - from reading the other posts on this topic on this forum - that some buffer was written past its end and corrupted the dynamic memory linked list. Is there any good way to determine exactly <i>which</i> buffer was corrupted? I don't believe that it was the one that I get the error on, it was probably the previous or next one in the chain. I can see the memory chain in the resource window, but I'm not sure how to interpret it.

Hi pblase,
Here is an KnowledgeBase article that was written for LabWindows\CVI 6.0 but it still has some valid suggestions for debugging in LabWindows\CVI 2010:
http://digital.ni.com/public.nsf/allkb/862567530005F09C8625632500692F41?OpenDocument
There are three valid suggestions to debug from this article. The only one that does not work still is the Run » Dynamic Memory feature.
Peter T
Applications Engineer
National Instruments

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Message was edited by:
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Regards
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Thank you for your reply Jackie.
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See the attached video.
-Nharish
Attachments:
FreeproblemLabwindows.avi ‏4781 KB

How do I solve the memory problem ( 5 beeps ) upon startup?

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Dynamic Memory on Linux VM

Hello!
Hyper-V 3.0 is great! After it will be released, I think it will become the most popular hypervisor. But it remains a major drawback.
Nowhere announced support for dynamic memory for Linux VM on Hyper-V.
Planned at least in some perspective to implement this functionality?
Now we have to use two different hypervisors, as Hyper-V does not meet all the requirements of our customers.
Mark Tepterev
Oversun

~
~
Moved P.P.P.S.
Q from Brian Wong:
----- Original Message -----
From: "Brian Wong"
To: <[email protected]>
Sent: Thursday, March 06, 2014 9:24 AM
Subject: Re: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled
On 3/6/2014 1:20 AM, Brian Wong wrote:
> The kernel is built with the full set of Hyper-V drivers, including the
> key "Microsoft Hyper-V Balloon Driver" as well as memory hot-add and
> hot-remove functionality. This is happening with both the Gentoo-patched
> 3.10.32 kernel and the vanilla 3.12.5 kernel. The host machine has a
> total of 24 GB of memory.
>
> For now, I am working around the issue by starting the VM with the
> startup memory set to the maximum and letting Hyper-V take the usused
> memory back when it is not in use. The VM will then get the extra memory
> when it needs it.
>
> Have I encountered a bug in the Hyper-V balloon driver?
>
Just a correction: the vanilla kernel version is 3.13.5, not 3.12.5.
Sorry for any confusion.
Brian Wong
http://www.fierydragonlord.com
----- Original Message -----
From: "Brian Wong"
To: <[email protected]>
Sent: Thursday, March 06, 2014 9:20 AM
Subject: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled
I'm new to LKML, so please don't be too hard on me :)
I'm running Gentoo Linux under Microsoft Client Hyper-V on Windows 8.1
Pro, and I've noticed some odd behavior with respect to dynamic memory
(aka memory ballooning). The system will never use more than the startup
memory defined in the virtual machine's settings.
( VVM: typewriting error viRtual fixed by me, for best search in future )
For example, if I set the startup memory to 512 MB, and enable dynamic
memory with a minimum of 512 MB and a maximum of 8192 MB, the system
will never allocate than 512 MB of physical memory, despite Hyper-V
assigning more memory to the VM and the added memory being visible in
the output of "free" and "htop". Attempting to use more memory causes
the system to start paging to swap, rather than actually allocating the
memory above the startup memory assigned to the VM.
The kernel is built with the full set of Hyper-V drivers, including the
key "Microsoft Hyper-V Balloon Driver" as well as memory hot-add and
hot-remove functionality. This is happening with both the Gentoo-patched
3.10.32 kernel and the vanilla 3.12.5 kernel. The host machine has a
total of 24 GB of memory.
Brian Wong wrote On 3/6/2014 1:20 AM:
Just a correction: the vanilla kernel version is 3.13.5, not 3.12.5. )
For now, I am working around the issue by starting the VM with the
startup memory set to the maximum and letting Hyper-V take the usused
memory back when it is not in use. The VM will then get the extra memory
when it needs it.
Have I encountered a bug in the Hyper-V balloon driver?
Brian Wong
http://www.fierydragonlord.com
----- Original Message -----
From: "Victor Miasnikov"
To: [email protected]; "Brian Wong"
Cc: "Abhishek Gupta (LIS)" ( zzzzzzzzzzzzzzz (at) microsoft.com>; "KY Srinivasan" zzzzzzzzzzz (at) microsoft.com
Sent: Thursday, March 06, 2014 1:07 PM
Subject: Re: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled RE: [PATCH 2/2]
Drivers: hv: balloon: Online the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
Hi!
Short:
Question to Linux kernel team:
may be patch
>>> [PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context"
can solve problems with dynamic memory hot add in Hyper-V VMs with Linux OS ?
Full:
BW>> .., if I set the startup memory to 512 MB, and enable dynamic
BW>> memory with a minimum of 512 MB and a maximum of 8192 MB,
BW>> the system will never allocate than 512 MB of physical memory
BW>>
BW>> Have I encountered a bug in the Hyper-V balloon driver?
BW>>
Unfortunately, It's long story . . . :-(
a)
I already ( on January 09, 2014 2:18 PM ) write about problems with "Online the hot-added memory" in "user space" see
P.P.S.
b)
See
Bug 979257 -[Hyper-V][RHEL6.5][RFE]in-kernel online support for memory hot-add
https://bugzilla.redhat.com/show_bug.cgi?id=979257
( Info from this topic may be interessant not only for RedHat users )
b2)
Detail about pathes related problem "Online the hot-added memory" in "user space" :
>>> [PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context"
>>>
>>>
>>> === 0001-Drivers-base-memory-Export-functionality-for-in-kern.patch
>>> . . .
>>> +/*
>>> + * Given the start pfn of a memory block; bring the memory
>>> + * block online. This API would be useful for drivers that may
>>> + * want to bring "online" the memory that has been hot-added.
>>> + */
>>> +
>>> +int online_memory_block(unsigned long start_pfn) { struct mem_section
>>> +*cur_section; struct memory_block *cur_memory_block;
>>>
>>> . . .
>>> ===
>>>
>>>
>>> ==
>>> . . .
>>> == 0002-Drivers-hv-balloon-Online-the-hot-added-memory-in-co.patch
>>>   . . .
>>>    /*
>>> -   * Wait for the memory block to be onlined.
>>> -   * Since the hot add has succeeded, it is ok to
>>> -   * proceed even if the pages in the hot added region
>>> -   * have not been "onlined" within the allowed time.
>>> +   * Before proceeding to hot add the next segment,
>>> +   * online the segment that has been hot added.
>>>     */
>>> - wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ);
>>> + online_memory_block(start_pfn);
>>>
>>>   }
c)
Before apply patches ( see in P.S. about native udev-script) we are need use one of this methods:
[ VVM:   URL of this topic skipped ]
c1)
"/bin/cp method" by Nikolay Pushkarev :
Following udev rule works slightly faster for me (assuming that memory0 bank always in online state):
SUBSYSTEM=="memory", ACTION=="add", DEVPATH=="/devices/system/memory/memory[1-9]*",
RUN+="/bin/cp /sys$devpath/../memory0/state /sys$devpath/state"}}
( VVM : of course all need be place in one line, 2 line in this msg. -- only for good visual formating reasons )
c2)
udev rule using "putarg" by Nikolay Pushkarev :
Even "/bin/cp method" udev rule work time to time not as need :-(
As a result, Nikolay Pushkarev write a program putarg.c, that is even faster than "/bin/cp method" :
==
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <string.h>
int main(int argc, char** argv) {
int i, fd;
if (argc < 2) return 0;
if ((fd = open(argv[1], O_RDWR)) < 0) return 1;
for (i = 2; i < argc; i++) {
    if (write(fd, argv[i], strlen(argv[i])) < 0) {
      close(fd);
      return i;
close(fd);
return 0;
==
The first argument - the name of the output file ,
and argument number 2 ( and all subsequent ( if exist ) ) - are text that are wiil be written in output file.
Compile source code to executable file by run command:
gcc -o putarg -s putarg.c
The resulting binary need be placed an accessible location , such as /usr/bin, or wherever you want.
Now udev rule using "putarg" can be written as :
SUBSYSTEM=="memory", ACTION=="add", RUN+="/usr/bin/putarg /sys$devpath/state online"
This complex solutions ( compiled file and udev-rule ) works exceptionally fast.
Best regards, Victor Miasnikov
Blog: http://vvm.blog.tut.by/
P.S.
Nikolay Pushkarev about standart udev-script :
Strange, that the native udev-script
SUBSYSTEM=="memory", ACTION=="add", ATTR{state}="online"
triggered somehow through time ( VVM: very often not work as need )
P.P.S.
----- Original Message -----
From: "Victor Miasnikov"
To: "Dan Carpenter"; "K. Y. Srinivasan" ; <[email protected]>
Cc: "Greg KH" ; <[email protected]>; <olaf (at) aepfle.de>; ""Andy Whitcroft"" <zzzzzzzzzzzz (at)
canonical.com>;
<jasowang (at) redhat.com>
Sent: Thursday, January 09, 2014 2:18 PM
Subject: RE: [PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
Implement the file copy service
Hi!
> Is there no way we could implement file copying in user space?
For "file copy service" "user space" may be pretty good
But I ( and other Hyper-V sysadmin) see non-Ok ( in "political correct" terminalogy) results with "hv: balloon: Online
the hot-added memory" in "user space"
==
[PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context"
==
What news? Roadmap?
Best regards, Victor Miasnikov
Blog: http://vvm.blog.tut.by/
~
~
~
~
~
~
~
~
~
----- Original Message -----
From: "KY Srinivasan"
To: "Victor Miasnikov"; [email protected]; "Brian Wong"
Cc: "Abhishek Gupta (LIS)"
Sent: Thursday, March 06, 2014 1:23 PM
Subject: RE: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled RE: [PATCH 2/2]
Drivers: hv: balloon: Online the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
> -----Original Message-----
> From: Victor Miasnikov
> Sent: Thursday, March 6, 2014 3:38 PM
> To: [email protected]; Brian Wong
> Cc: Abhishek Gupta (LIS); KY Srinivasan
> Subject: Re: Linux does not use more than the startup RAM under Hyper-V
> with dynamic memory enabled RE: [PATCH 2/2] Drivers: hv: balloon: Online
> the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
>
Victor,
I will try to get my in-context onlining patches accepted upstream.
K. Y

Dynamic memory freezes

Hi guys,
we are using three node cluster with Windows Server 2012R2. Our virtual machines are virtual
desktops with Windows 8.1 guest OS, 4 vCPU and 8 GB of dynamic memory.
Sometimes dynamic memory stops working, guest OS is not able to allocate more RAM and starts to swap. This swapping slows performance of all our virtual machines, since
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Hi manasj,
Please check event log "Microsoft-Windows-Hyper-V Worker/Admin " to see if there is any clue .
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For details please refer to following link :
http://support.microsoft.com/kb/2504962/en-us
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Memory Problem with SEt and GET parameter

hi,
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SET PARAMETER exit code is ....
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get parameter id 'ZC2' field c_fmderive-fund.
get parameter id 'ZC3' field c_fmderive-fund.
FREE MEMORY ID 'ZC1'.
FREE MEMORY ID 'ZC2'.
   FREE MEMORY ID 'ZC3'.
In this code i m facing memory problem.
It is not refreshing the memory every time.
So plz give me proper solution.
Its urgent.
Thanks
Ranveer

Hi,
   I suppose you are trying to store some particular value in memory in one program and then retieve it in another.
If so try using EXPORT data TO MEMORY ID 'ZC1'. and IMPORT data FROM MEMORY ID 'ZC1'.
To use SET PARAMETER/GET PARAMETER the specified parameter name should be in table TPARA. Which I don't think is there in your case.
Sample Code :
Data declarations for the function codes to be transferred
DATA : v_first TYPE syucomm,
       v_second TYPE syucomm.
CONSTANTS : c_memid TYPE char10 VALUE 'ZCCBPR1'.
Move the function codes to the program varaibles
v_first = gv_bdt_fcode.
v_second = sy-ucomm.
Export the function codes to Memory ID
EXPORT v_first
       v_second TO MEMORY ID c_memid.        "ZCCBPR1 --- Here you are sending the values to memory
Then retrieve it.
Retrieve the function codes from the Memory ID
IMPORT v_first TO v_fcode_1
         v_second TO v_fcode_2
FROM MEMORY ID c_memid.                                   "ZCCBPR1
FREE MEMORY ID c_memid.                                   "ZCCBPR1
After reading the values from memory ID free them your problem should be solved.
Thanks
Barada
Edited by: Baradakanta Swain on May 27, 2008 10:20 AM

Memory problems with PreparedStatements

Driver: 9.0.1 JDBC Thin
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After profiling our application, we found that a large number oracle.jdbc.ttc7.TTCItem objects were being created, but not released, even though we were "closing" the ResultSets of a prepared statements.
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We tend to have a large number of PreparedStatement objects in use (over 100, most with closed ResultSets) and find that our application is using huge amounts of memory when compared to using the same code, but closing the PreparedStatement at the same time as closing the ResultSet.
Has anyone else found similar problems? If so, does anyone have a work-around or know if this is something that Oracle is looking at fixing?
Thanks
Bruce Crosgrove

From your mail, it is not very clear:
a) whether your session is an HTTPSession or an application defined
session.
b) What is meant by saying: JSP/Servlet is growing.
However, some pointers:
a) Are there any timeouts associated with session.
b) Try to profile your code to see what is causing the memory leak.
c) Are there references to stale data in your application code.
Marilla Bax wrote:
hi,
we have some memory - problems with the WebLogic Application Server
4.5.1 on Sun Solaris
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Dual Channel memory problems on Neo 875P

I am having considerable trouble getting the NEO 875P to work with dual channel DDR400 DIMMs. I have two Kingston KVR400X64C25 DDR400 256MB memory modules, each of which works correctly by itself. However, once I move one
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http://www.centerfuse.net
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>I can only answer based on what I've read on this forum
I figured as much, I was just wondering if you knew whether MSI themselves frequents the forums or answers emails sufficiently.
I've had an interesting development though. I stumbled upon Tom's Hardware Guide's article about 875P motherboards at http://www17.tomshardware.com/motherboard/20030519/i875p-01.html
They mentioned that they needed to increase the memory voltage from 2.5 to 2.6 in the BIOS to get some memory modules to work. I did this, and for the first time, I am running in Dual channel DDR mode. However, the article also mentions that "the system does not run completely stably", so I guess I'll have to wait and see if it crashes again. However, I'm far enough beyond the XP splash screen to post this message, so I guess we're getting somewhere!
-Jim Keller
http://www.centerfuse.net

InDesign CS4 memory problems

I have had memory problems with InDesign CS4 (and also with Photoshop CS4) for about a year now. If my file has a lot of pictures (100+) at some stage I get error message "Out of memory" . In the beginning it just have problems with redraw pictures (half of picture stays black), but also export to pdf is halted by same message and printing to file also. No problems in the beginning of large files or with files with text only. At one point InD just has enough and starts to behave like a ... Only solution is to export InD CS4 file as INX and continue to work in CS3 (but it takes a long time to match the text flow because textengine works differently). It's not monitor, because I have changed monitor during this year (from LaCie 22 blue IV to EIZO 27"). It seems that it's not video (NVIDIA GeForce 9800 GTX, 512 MB) also, because everything functions normally with CS3. I know, that it's not a proper video card for my work, but one likes to play Bioshock sometimes... Something strange happens with Photoshop CS4 also when I work for a long time without shutting down the program. After about editing 60+ pictures Photoshop CS4 begins to slow down (specially with using clone tool).up to impossible to work. You just have to wait while the cursor is dragging itself to right place an picture is redrawing itself. Seems like memory cannot empty itself and gets overloaded when working with CS4. No problems with Photoshop CS3. One cannot notice anything with small files. I can work with CS3 but there are features I would like to use in CS4.
Have anyone experienced anything similar?
Claudius
Win XP SP3
4GB RAM
video NVIDIA GeForce 9800 GTX 512MB with latest drivers
CS4 and CS3

Having exactly the same here. 16 Gb of ram in an 8 core 64 bits Vista system. Absolutely no infections on my system. Having great troubles getting my work ouputted.
I'm making an overview with 50 cards with pictures in them and bevels on the edges, dropshadows. It might be heavy but it is a normal question from my client.
I don't care if transparency is difficult for Adobe to handle. They shouldn't make it public if it is not properly tested. I am now so far as to make the composition in photoshop ( if that works)
What I thought was the problem is that I originaly placed indesign files in frames. But there is a great script out there on www.automatication.com to convert that in editable object again. Works great so check that out. But this didn't solve my problem. The effects used in these items are the memory consummers and Adobe is not freeing the memory properly.
Advise to Adobe: check also to dropshadows feature because this is not scaling up or down with the rest of the effect.
I'm am writing a realtime 3D renderengine here, if CS5 is not working fine, I might digg in to this one as well, getting a bit tired of waiting for properly working software.
Jaap Clarenburg
[email protected]

X3-02 Memory problem!!! URGENT!!!

Hi.My XX3-02 is facing very serious memory problem.
After i changing the memory status of my phone,my frens all can't sms to me.They all found tat my msg memory is full and they couldn't send msg to me.
Wat's wrong wif my phone?
can anyone help me wif tis??

Can't seem to solve this with my X3-02. Just got myself an iPhone4. No more Nokias for me this time on.

Out of memory problem using the API

Hi all,
I need your assistance, we are working with CDB 10.2 making searches and retrieving the documents with all their attributes.
In our actual scenario we have a single user (which represents an application) accessing CDB. This user use several persistent sessions simultaneously. I mean, several thousands of final users connect to an application that uses one user of CDB to connect to CDB with several persistent sessions.
To simulate this scenario we wrote java code that open five threads and make several searches (requesting all the attributes) using the same user on cdb.
Retrieving a considerable amount of data found on the search (~5000), we found a “Out of memory” problem when we made these tests:
-     5 threads obtaining 100 documents (and all their attributes) / search
-     1 thread obtaining 500 documents (and all their attributes) / search
-     Also we have same problem if we make several searches with less results
We suppose it’s a configuration or code issue so we ask for your assistance and experience to solve it.
Thanks for your help,
Dani
import java.sql.Connection;
import oracle.ifs.examples.api.constants.AttributeRequests;
import oracle.ifs.examples.api.util.CommonUtils;
import oracle.ifs.fdk.Attributes;
import oracle.ifs.fdk.ClientUtils;
import oracle.ifs.fdk.FdkConstants;
import oracle.ifs.fdk.FdkCredential;
import oracle.ifs.fdk.ManagersFactory;
import oracle.ifs.fdk.NamedValue;
import oracle.ifs.fdk.Options;
import oracle.ifs.fdk.SearchExpression;
import oracle.ifs.fdk.SearchManager;
import oracle.ifs.fdk.SimpleFdkCredential;
import oracle.jdbc.pool.OracleDataSource;
public class Prueba {
     public static void main(String args[]) {
          Thread thread = new BasicThread1();
          Thread thread1 = new BasicThread1();
          Thread thread2 = new BasicThread1();
          Thread thread3 = new BasicThread1();
          Thread thread4 = new BasicThread1();
          thread.start();
          thread1.start();
          thread2.start();
          thread3.start();
          thread4.start();
class BasicThread1 extends Thread {
     public void run() {
          ManagersFactory session = null;
          try {
               System.out.println(this.getName() + "-->init");
               session = getSession();
               SearchManager sManager = session.getSearchManager();
               SearchExpression srchExpr = new SearchExpression(Attributes.SIZE,
                         new Integer(20000000), FdkConstants.OPERATOR_LESS_THAN);
               NamedValue[] res = null;
               for (int i = 0; i < 100000; i++) {
                    res = sManager.search(srchExpr, basicSearchOptions2,
                              AttributeRequests.DOCUMENT_CATEGORY_ATTRIBUTES);
               System.out.println(this.getName()+" --> fin sin error: " + res.length);
               } catch (Throwable t) {
t.printStackTrace();
System.out.println("<--"+this.getName());
          } finally {
               CommonUtils.bestEffortLogout(session);
     static NamedValue[] basicSearchOptions2 = new NamedValue[] {
               ClientUtils.newNamedValue(
                                   Options.MULTILEVEL_FOLDER_RESTRICTION,
                                   Boolean.TRUE),
               ClientUtils.newNamedValue(Options.SEARCH_FOR_DOCUMENTS,
                         Boolean.TRUE),
               ClientUtils.newNamedValue(Options.SEARCH_FOR_FOLDERS,
                         Boolean.FALSE),
               ClientUtils.newNamedValue(Options.RETURN_COUNT,
                         new Integer(500)) //<<Maximo nº de elementos
     private static ManagersFactory getSession() throws Exception {
     OracleDataSource ods = new OracleDataSource();
     ods.setURL("URL");
     Connection conn = ods.getConnection();
     FdkCredential credential = new SimpleFdkCredential("USER","PSW");
     ManagersFactory session = ManagersFactory.login(credential,
     "SERVER");
return session;
}

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