Running multiple instances of program at same time problems

I have a c++ program that uses BerkeleyDB 4.8.26 with transactions. Program works well, and I can run multiple instances of program and they cooperate on database very well. Problem arises when I run a small test program that runs 10 instances of the same program at same time.
Test program opens database with transactions, it does some database reads and writes and quits. This test is run in 10 instances of the same program at the same time. Some instances run and finish well, other instances end up with some of these errors:
unable to allocate memory for the lock table
PANIC: Cannot allocate memory
Error opening environment: DB_RUNRECOVERY: Fatal error, run database recovery
another with:
db_files/__db.001: No such file or directory
db_files: No such file or directory
Error opening environment: Invalid argument
others with this one:
Log file corrupt at LSN: [1][84474]
fileops: close db_files/log.0000000001
PANIC: Invalid argument
unable to join the environment
db_files: No such file or directory
Error opening environment: DB_RUNRECOVERY: Fatal error, run database recovery
I don't understand reason of this error, as I thought (and read) that BerkeleyDB should be able to handle multiple instances accessing database and is thread-safe.
I tried to run the test on both NFS and local disk drive with same results.
Is there anyone with ide what could be causing this problem ? My platform is x86_64 GNU/Linux 2.6.18-164.el5
Edited by: Miro Janosik on 21.9.2010 22:42

If there is someone who would like to look at this problem I'd like to show you program log files with verbose output turned on. There are 11 log files in the archive: http://bin.mypage.sk/FILES/log.rar
Log files that end up with lines like this one below mean that program finished running ok:
4000|0     4     20100922 07:07:24.094     20100922 07:07:24.094     FLOW_CMD
Here below is output from one of log files:
FilePersistentStorage::open() start
FilePersistentStorage::open() ReadDir
FilePersistentStorage::open() db_env_create
FilePersistentStorage::open() db_env_create ok
FilePersistentStorage::open() set cachesize
FilePersistentStorage::open() set_tx_max
FilePersistentStorage::open() set_timeout
FilePersistentStorage::open() set_lk_detect
FilePersistentStorage::open() exists homedir?
envp->open
FilePersistentStorage::open() envp->open
fileops: stat /var/tmp
fileops: open db_files/__db.rep.init
fileops: close db_files/__db.rep.init
fileops: open db_files/__db.001
fileops: close db_files/__db.001
fileops: open db_files/__db.001
fileops: mmap db_files/__db.001
fileops: close db_files/__db.001
unable to join the environment
fileops: directory list db_files
fileops: unlink db_files/__db.005
fileops: unlink db_files/__db.004
fileops: unlink db_files/__db.003
fileops: unlink db_files/__db.002
fileops: unlink db_files/__db.001
fileops: open db_files/__db.001
fileops: open db_files/__db.001
fileops: read db_files/log.0000000001: 12 bytes at offset 371
Finding last valid log LSN: file: 1 offset 371
fileops: close db_files/log.0000000001
fileops: open db_files/__db.005
fileops: seek db_files/__db.005 to 794624
fileops: write db_files/__db.005: 8192 bytes
fileops: mmap db_files/__db.005
fileops: close db_files/__db.005
fileops: open db_files/__db.006
fileops: seek db_files/__db.006 to 376832
fileops: write db_files/__db.006: 8192 bytes
fileops: mmap db_files/__db.006
fileops: close db_files/__db.006
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 12 bytes at offset 335
fileops: read db_files/log.0000000001: 371 bytes at offset 0
fileops: directory list db_files
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 28 bytes
fileops: close db_files/log.0000000001
Recovery starting from [1][243]
fileops: close db_files/log.0000000001
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 28 bytes
fileops: write db_files/log.0000000001: 92 bytes at offset 371
fileops: flush db_files/log.0000000001
fileops: close db_files/log.0000000001
fileops: open db_files/log.0000000002
fileops: close db_files/log.0000000002
fileops: open db_files/log.00002
fileops: close db_files/log.00002
fileops: open db_files/log.0000000001
fileops: seek db_files/log.0000000001 to 463
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 4096 bytes
fileops: write db_files/log.0000000001: 3633 bytes
fileops: close db_files/log.0000000001
Recovery complete at Wed Sep 22 07:07:23 2010
Maximum transaction ID 80000002 Recovery checkpoint [1][371]
FilePersistentStorage::open() ok
envp->lock_detect
FilePersistentStorage::open() lock_detect
rejected locks count: 0
db_create
dbp->open
fileops: stat db_files/test_aaps.db
fileops: stat db_files/test_aaps.db
fileops: stat db_files/__db.80000001.d9f23b56
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 28 bytes
fileops: write db_files/log.0000000001: 67 bytes at offset 463
fileops: flush db_files/log.0000000001
fileops: open db_files/__db.80000001.d9f23b56
fileops: stat db_files/__db.80000001.d9f23b56
fileops: seek db_files/__db.80000001.d9f23b56 to 0
fileops: write db_files/__db.80000001.d9f23b56: 4096 bytes
fileops: seek db_files/__db.80000001.d9f23b56 to 4096
fileops: write db_files/__db.80000001.d9f23b56: 4096 bytes
fileops: flush db_files/__db.80000001.d9f23b56
fileops: close db_files/__db.80000001.d9f23b56
fileops: stat db_files/test_aaps.db
fileops: stat db_files/__db.80000001.d9f23b56
fileops: unlink db_files/__db.80000001.d9f23b56
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 12 bytes at offset 463
DB_LOGC->get: LSN 1/463: invalid log record header
DB_TXN->abort: log undo failed for LSN: 1 463: Input/output error
fileops: close db_files/log.0000000001
PANIC: Input/output error
fileops: open db_files/log.0000000001
fileops: read db_files/log.0000000001: 12 bytes at offset 463
PANIC: fatal region error detected; run recovery
DB_LOGC->get: LSN: 1/463: read: DB_RUNRECOVERY: Fatal error, run database recovery
DB_TXN->abort: log undo failed for LSN: 1 463: DB_RUNRECOVERY: Fatal error, run database recovery
fileops: close db_files/log.0000000001
PANIC: DB_RUNRECOVERY: Fatal error, run database recovery
PANIC: DB_RUNRECOVERY: Fatal error, run database recovery
dbp->open end
dbp->close
PANIC: fatal region error detected; run recovery
envp->close
File handles still open at environment close
Open file handle: db_files/log.0000000001
fileops: close db_files/log.0000000001
PANIC: fatal region error detected; run recovery
Database 'db_files//test_aaps.db' open failed: DB_RUNRECOVERY: Fatal error, run database recoveryDatabase close failed: DB_RUNRECOVERY: Fatal error, run database recovery
environment close failed:

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              > >
              > > > The servlet does not run a second time.
              > > > Is there a way to move the AppInitservlet to inside the webApp and
              maybe
              > use
              > > > the web.xml to start each one individually?
              > > > Thank you for any insight
              > >
              > > > John Norton
              > > > Indent Inc
              > > > --
              > > > *************************************************
              > > > John Norton
              > > > Indent Inc.
              > > > (Innovative decision technologies, inc.)
              > > > [email protected]
              > >
              > > > *************************************************
              > >
              > >
              > >
              > >
              > > --
              > > Dimitri
              >
              >
              >
              

  • Sometimes my computer takes too long to connect to new website. I am running a pretty powerful work program at same time, what is the best solution? Upgrading speed from cable network, is it a hard drive issue? do I need to "clean out" the computer?

    Many times my computer takes too long to connect to new website. I have wireless internet (time capsule) and I am running a pretty powerful real time financial work program at same time, what is the best solution? Upgrading speed from cable network? is it a hard drive issue? do I only need to "clean out" the computer? Or all of the above...not to computer saavy.  It is a Macbook Pro  osx 10.6.8 (late 2010).

    Almost certainly none of the above!  Try each of the following in this order:
    Select 'Reset Safari' from the Safari menu.
    Close down Safari;  move <home>/Library/Caches/com.apple.Safari/Cache.db to the trash; restart Safari.
    Change the DNS servers in your network settings to use the OpenDNS servers: 208.67.222.222 and 208.67.220.220
    Turn off DNS pre-fetching by entering the following command in Terminal and restarting Safari:
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  • Running multiple instances on same machine

    I need to run multiple instances of BEA WLS on a unix machine. I need 4 separate instances (dev and test for two different departments) on one machine and two production instances on another machine. What is the best way to go about separating these (ex. an account or directory structure for each)?
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    Roger ---|-

    Dev/Test:
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    Do the same, but to keep licensing costs down, I'd be inclined to run everything
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    simon.
    Roger Cornejo wrote:
    I need to run multiple instances of BEA WLS on a unix machine. I need4 separate instances (dev and test for two different departments) on
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  • Running multiple instances from same oracle home

    Hi Gurus,
    I am preparing for OCA 11g examination. I had a question about running multiple instances from same oracle home. While reading the book I came across a statement about database control which says "If there are several database instances running off the same Oracle home, then each will have its own Database Control instance".
    Now I assume that this statement implies multiple instances accessing the same physical database (which as per my knowledge can happen only in case of a RAC).
    I am not able to understand how exactly can you have multiple database instances in a single oracle home. I have installed Oracle 11g on my computer whose oracle home is +"D:\oracle\product\10.2.0\db_1"+; now this directory houses all the binaries (executables and folders like admin,bin, etc) for the oracle instance that I have installed (the instance name is ocp1). Now if I am to install or create another Oracle Instance (say ocp2) in the same home, wont there be a conflict of binaries of the two instances in the same home ?
    Basically,it makes sense if db_1 folder is further split into multiple folders, one for each instance (for example, one for ocp1 & one for ocp2); each of these folders will then contain the binary files, libraries,etc for its own instance; but, this is not the case, here db_1 houses all the binaries directly under it ...
    The other question which stems from the statement I mentioned above is that if having multiple instances running from same oracle home accessing the same physical database, can this arrangement be called RAC at all; or does RAC dictate that you cannot have multiple instances that are accessing the same database have to be installed on physically separate machines and so you cannot have two RAC instances (accessing same physical database) installed on the same computer ??
    I hope my questions are not too much confusing ... !!
    Cheers,
    Sudripta

    Hello,
    "If there are several database instances running off the same Oracle home, then each will have its own Database Control instance".This is true, and also means each instance will have its separate database (i.e. dbf files etc.) & separate DB Control. Usually in this case you create several instances on the same node.
    Now I assume that this statement implies multiple instances accessing the same physical database (which as per my knowledge can happen only in case of a RAC).You are correct about RAC where several instances (usually running on separate nodes) access the RAC.
    More info:
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    1 Oracle Home - Many Databases - Many SID is possible.
    1 Oracle HOme - 1 Database - Multiple SID is possible and this is called RAC.

  • Multiple instances spawned after daylight savings time change

    This is a known issue and there is an SAP Knowledge Base Article created on this issue:
    1448881 - Multiple instances spawned after daylight savings time change
    Below is the information from the SAP Knowledge Base Article:
    Symptom
    Scheduled reports that are supposed to run once a day, run multiple times.
    Duplicate instances are being created.
    Environment
    BusinessObjects Enterprise XIR2 SP5
    BusinessObjects Enterprise XIR2 SP5 + FP5.x
    Reproducing the Issue
    A report is scheduled to be run on a daily basis - this is a Recurring schedule.
    Normally the report runs once a day, at a particular time.
    After Daylight Savings Time change, the report runs at the specified time, but immediately after the successful instance, another instance is spawned.
    Many more instances spawn after each instance completes.
    Cause
    This is a known issue: ADAPT01318487. This issue is because of DST and how our code handles this change.
    Resolution
    There is currently no known fix for this issue. There is however a script that can quickly resolve the problem.
    The issue it seems is related to Daily recurring schedules.
    What this script will do:
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    you will have the option to choose your jobs and reschedule them by 1 hour
    you will then highlight the same job and change them back by 1 hour
    by modifying the schedule times, you are modifying the schedule itself and this will keep the issue of duplicate instances from occurring.
    Exact Steps to Complete:
    Stop the Job Servers.
    Double click on the .hta file.
    Change the System Name to that of your CMS name.
    Add the Administrator's password.
    Click Logon.
    Click List All Recurring Instances.
    Select All.
    Make note of what it says in: Schedule Selected Recurring Instances: Should be 1 hr earlier.
    Click Reschedule Selected Recurring Instances.
    Choose All instances again and change Schedule Selected Recurring Instances to 1 hour Later.
    Click Reschedule Selected Recurring Instances.
    Now start your Job Servers.
    The issue should not occur again.
    The Script is attached here, but please review the SAP Knowledge Base article 1448881 as well

    Hi Nicola,
    - The multiple spawned instances issue ONLY affects XI3 SP3+ only.  For XI3 SP1 and SP2 all Fix Pack levels this is not an issue as it was introduced as a problem in SP3.
    - 1568239 notes the Java version and can apply to all O/S environments and is updated to reflect that.
    If you are located in Europe you can also apply the patches in advance of the DST change to avoid the problem.  If you are in Americas at this point utilizing the clean up scripts for this year is the approach needed to clean up the spawned instances and reschedule the existing schedules.
    Thanks,
    Chris

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