Re: [Dspace-tech] another unscheduled shutdown

2013-07-08 Thread Ady Wahyudi Paundu 


Thank you to Dr.Andrea, we downgraded the jvm (to 6u45) and the tomcat 
have been running for almost a week without forced shutdown (previously 
3-4 times a day).


on a side note, aren't there suppose any documentation about jvm 
compatibility to each OS version?


Best Regards.
AdyWP

On 07/03/2013 12:01 PM, Andrea Schweer wrote:

Hi,

On 03/07/13 14:20, Ady Wahyudi Paundu wrote:
is it a known problem? because i've read several article about bugs 
on java 7, something about loops?

so, did you downgrade your jvm?


We downgraded the jvm; I haven't had time to do a root cause 
investigation.


cheers,
Andrea

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Re: [Dspace-tech] another unscheduled shutdown

2013-07-03 Thread adywp 

 I,ve done several hardware test these couple of days using memtest86+ 
 and`IBM DSA Memory stress test.
 IBM DSA Memory Stress Test gave me 'Passed' result, but memtest86+ 
 showed errors.
 I don't know which one to believe, so i think i will try Dr.Andrea's 
 option.

 Dr.Andrea, which jvm version now you are running?

 Regards,
 AdyWP

 On Wed, 03 Jul 2013 16:01:33 +1200, Andrea Schweer wrote:
 Hi,

 On 03/07/13 14:20, Ady Wahyudi Paundu wrote:

 is it a known problem? because i've read several article about
 bugs on java 7, something about loops?
 so, did you downgrade your jvm?

  We downgraded the jvm; I haven't had time to do a root cause
 investigation.

  cheers,
  Andrea


 
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Re: [Dspace-tech] another unscheduled shutdown

2013-07-02 Thread Ady Wahyudi Paundu 


is it a known problem? because i've read several article about bugs on 
java 7, something about loops?

so, did you downgrade your jvm?

as for my problem, i still haven't pinpoint the source problem, but now 
i'm investigating the probability of hardware (RAM) problem


Regards,
AdyWP

On 06/27/2013 10:56 AM, Andrea Schweer wrote:
I've had problems with Java 7 on a RHEL box (RHEL 6.4), maybe that's 
it here too?


cheers,
Andrea


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Re: [Dspace-tech] another unscheduled shutdown

2013-07-02 Thread Andrea Schweer 

  
  
Hi,

On 03/07/13 14:20, Ady Wahyudi Paundu
  wrote:


  
  
  is it a known problem? because i've read several article about
  bugs on
  java 7, something about loops?
  so, did you downgrade your jvm?


We downgraded the jvm; I haven't had time to do a root cause
investigation.

cheers,
Andrea

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IRR Technical Specialist, ITS Information Systems
The University of Waikato, Hamilton, New Zealand
  


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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Ady Wahyudi Paundu 

Hiy'all

unfortunately my system still experiencing unscheduled tomcat shutdown 
(even after i increase the heap and permgen).
this is the error message i got from catalina.out:

 # A fatal error has been detected by the Java Runtime Environment:
 #
 #  SIGSEGV (0xb) at pc=0x2afaab76955d, pid=6604, tid=1081977152
 #
 # JRE version: 7.0_21-b11
 # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.21-b01 mixed mode 
 linux-amd64 compressed oops)
 # Problematic frame:
 # V  [libjvm.so+0x69b55d]  MachNode::in_RegMask(unsigned int) const+0x3d
 #
 # Failed to write core dump. Core dumps have been disabled. To enable 
 core dumping, try ulimit -c unlimited before starting Java again
 #
 # An error report file with more information is saved as:
 # /home/dzpac3/hs_err_pid6604.log
 #
 # If you would like to submit a bug report, please visit:
 #   http://bugreport.sun.com/bugreport/crash.jsp

i know this is JVM problem (and not dspace's), but i'm asking this 
question anyway:
can anybody help me for a solution?

TIA
AdyWP

On 06/13/2013 05:12 PM, helix84 wrote:

 There's really no hard science behind determining those numbers. For
 starters, you can increase them to 2x their current value. I recommend
 deploying the Psi probe [1] webapp and watching utilization of the
 different memory spaces over time to get some idea how much they need.

 You can find a bit of information on here, but no exact values: [2]

 After giving Tomcat more memory, you should notice significant
 improvement in page load times. Especially Solr is memory-hungry, so
 this will be most visible if you're using Discovery.


 [1] http://code.google.com/p/psi-probe/
 [2] https://wiki.duraspace.org/display/DSDOC3x/Performance+Tuning+DSpace


 Regards,
 ~~helix84



 
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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Hilton Gibson 
Can you send the following system specs:

1. Server operating system.
2. Server hardware, with RAM and CPU details.
3. DSpace version and UI used.
4. Details of guides or links used to setup the IR.

Cheers

hg


On 26 June 2013 12:04, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:


 Hiy'all

 unfortunately my system still experiencing unscheduled tomcat shutdown
 (even after i increase the heap and permgen).
 this is the error message i got from catalina.out:

  # A fatal error has been detected by the Java Runtime Environment:
  #
  #  SIGSEGV (0xb) at pc=0x2afaab76955d, pid=6604, tid=1081977152
  #
  # JRE version: 7.0_21-b11
  # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.21-b01 mixed mode
  linux-amd64 compressed oops)
  # Problematic frame:
  # V  [libjvm.so+0x69b55d]  MachNode::in_RegMask(unsigned int) const+0x3d
  #
  # Failed to write core dump. Core dumps have been disabled. To enable
  core dumping, try ulimit -c unlimited before starting Java again
  #
  # An error report file with more information is saved as:
  # /home/dzpac3/hs_err_pid6604.log
  #
  # If you would like to submit a bug report, please visit:
  #   http://bugreport.sun.com/bugreport/crash.jsp

 i know this is JVM problem (and not dspace's), but i'm asking this
 question anyway:
 can anybody help me for a solution?

 TIA
 AdyWP

 On 06/13/2013 05:12 PM, helix84 wrote:
 
  There's really no hard science behind determining those numbers. For
  starters, you can increase them to 2x their current value. I recommend
  deploying the Psi probe [1] webapp and watching utilization of the
  different memory spaces over time to get some idea how much they need.
 
  You can find a bit of information on here, but no exact values: [2]
 
  After giving Tomcat more memory, you should notice significant
  improvement in page load times. Especially Solr is memory-hungry, so
  this will be most visible if you're using Discovery.
 
 
  [1] http://code.google.com/p/psi-probe/
  [2] https://wiki.duraspace.org/display/DSDOC3x/Performance+Tuning+DSpace
 
 
  Regards,
  ~~helix84
 


 
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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Ady Wahyudi Paundu 


here is my machine info:

- dual cpu (xeon 2.2G) IBM machine with 2x8 GB memory
- work only for repository (plus postgredb)
- with modjk to work with apache
- using only xmlui-mirage
- Current JAVA_OPTS=-Xmx8192M -Xms8192M -XX:MaxPermSize=1024M -XX:PermSize=1024M 
-XX:+UseParallelGC -XX:-UseLoopPredicate -Dfile.encoding=UTF-8 
-Dcom.sun.management.jmxremote=true
- OS: RedHat Enterprise 5.6 64 bit
- DSpace 3.1


Thanks
AdyWP


On 06/26/2013 06:36 PM, Hilton Gibson wrote:

Can you send the following system specs:

1. Server operating system.
2. Server hardware, with RAM and CPU details.
3. DSpace version and UI used.
4. Details of guides or links used to setup the IR.

Cheers

hg


On 26 June 2013 12:04, Ady Wahyudi Paundu ad...@unhas.ac.id 
mailto:ad...@unhas.ac.id wrote:



Hiy'all

unfortunately my system still experiencing unscheduled tomcat shutdown
(even after i increase the heap and permgen).
this is the error message i got from catalina.out:

 # A fatal error has been detected by the Java Runtime Environment:
 #
 #  SIGSEGV (0xb) at pc=0x2afaab76955d, pid=6604, tid=1081977152
 #
 # JRE version: 7.0_21-b11
 # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.21-b01 mixed mode
 linux-amd64 compressed oops)
 # Problematic frame:
 # V  [libjvm.so+0x69b55d]  MachNode::in_RegMask(unsigned int)
const+0x3d
 #
 # Failed to write core dump. Core dumps have been disabled. To
enable
 core dumping, try ulimit -c unlimited before starting Java again
 #
 # An error report file with more information is saved as:
 # /home/dzpac3/hs_err_pid6604.log
 #
 # If you would like to submit a bug report, please visit:
 # http://bugreport.sun.com/bugreport/crash.jsp

i know this is JVM problem (and not dspace's), but i'm asking this
question anyway:
can anybody help me for a solution?

TIA
AdyWP





 
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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Hilton Gibson 
Ok.

Have you tried this:
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S08#Step_8.3_Increase_number_of_open_files_available

Cheers

hg


On 26 June 2013 12:47, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:

 **

 here is my machine info:

 - dual cpu (xeon 2.2G) IBM machine with 2x8 GB memory
 - work only for repository (plus postgredb)
 - with modjk to work with apache
 - using only xmlui-mirage
 - Current JAVA_OPTS=-Xmx8192M -Xms8192M -XX:MaxPermSize=1024M 
 -XX:PermSize=1024M -XX:+UseParallelGC -XX:-UseLoopPredicate 
 -Dfile.encoding=UTF-8 -Dcom.sun.management.jmxremote=true
 - OS: RedHat Enterprise 5.6 64 bit
 - DSpace 3.1


 Thanks
 AdyWP


 On 06/26/2013 06:36 PM, Hilton Gibson wrote:

 Can you send the following system specs:

  1. Server operating system.
 2. Server hardware, with RAM and CPU details.
 3. DSpace version and UI used.
 4. Details of guides or links used to setup the IR.

  Cheers

  hg


 On 26 June 2013 12:04, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:


 Hiy'all

 unfortunately my system still experiencing unscheduled tomcat shutdown
 (even after i increase the heap and permgen).
 this is the error message i got from catalina.out:

  # A fatal error has been detected by the Java Runtime Environment:
  #
  #  SIGSEGV (0xb) at pc=0x2afaab76955d, pid=6604, tid=1081977152
  #
  # JRE version: 7.0_21-b11
  # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.21-b01 mixed mode
  linux-amd64 compressed oops)
  # Problematic frame:
  # V  [libjvm.so+0x69b55d]  MachNode::in_RegMask(unsigned int) const+0x3d
  #
  # Failed to write core dump. Core dumps have been disabled. To enable
  core dumping, try ulimit -c unlimited before starting Java again
  #
  # An error report file with more information is saved as:
  # /home/dzpac3/hs_err_pid6604.log
  #
  # If you would like to submit a bug report, please visit:
  #   http://bugreport.sun.com/bugreport/crash.jsp

 i know this is JVM problem (and not dspace's), but i'm asking this
 question anyway:
 can anybody help me for a solution?

 TIA
 AdyWP





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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Ady Wahyudi Paundu 


Not yet, but i'm implementing it now...
i'll let you know the result
in the mean time, can you explain what it is for?

TIA
AdyWP

On 06/26/2013 07:27 PM, Hilton Gibson wrote:

Ok.

Have you tried this: 
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S08#Step_8.3_Increase_number_of_open_files_available


Cheers

hg


On 26 June 2013 12:47, Ady Wahyudi Paundu ad...@unhas.ac.id 
mailto:ad...@unhas.ac.id wrote:



here is my machine info:

- dual cpu (xeon 2.2G) IBM machine with 2x8 GB memory
- work only for repository (plus postgredb)
- with modjk to work with apache
- using only xmlui-mirage
- Current JAVA_OPTS=-Xmx8192M -Xms8192M -XX:MaxPermSize=1024M 
-XX:PermSize=1024M -XX:+UseParallelGC -XX:-UseLoopPredicate -Dfile.encoding=UTF-8 
-Dcom.sun.management.jmxremote=true
- OS: RedHat Enterprise 5.6 64 bit
- DSpace 3.1

 


Thanks
AdyWP





 
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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Hilton Gibson 
It should allow you to get a proper java dump the next time.
The dump should tell you what happened.
I am not a java expert but it seems like the direction to go.
Personally I have better results regularly using Ubuntu as a server.
Perhaps you should reconsider Redhat EL, I believe it has very old versions
of software.


On 26 June 2013 13:25, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:

 **

 Not yet, but i'm implementing it now...
 i'll let you know the result
 in the mean time, can you explain what it is for?

 TIA
 AdyWP

 On 06/26/2013 07:27 PM, Hilton Gibson wrote:

 Ok.

  Have you tried this:
 http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S08#Step_8.3_Increase_number_of_open_files_available

  Cheers

  hg


 On 26 June 2013 12:47, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:


 here is my machine info:

 - dual cpu (xeon 2.2G) IBM machine with 2x8 GB memory
 - work only for repository (plus postgredb)
 - with modjk to work with apache
 - using only xmlui-mirage
 - Current JAVA_OPTS=-Xmx8192M -Xms8192M -XX:MaxPermSize=1024M 
 -XX:PermSize=1024M -XX:+UseParallelGC -XX:-UseLoopPredicate 
 -Dfile.encoding=UTF-8 -Dcom.sun.management.jmxremote=true
 - OS: RedHat Enterprise 5.6 64 bit
 - DSpace 3.1



 Thanks
 AdyWP





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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Pottinger, Hardy J. 
Hi, I think you need more info before you do much more performance tuning, but, 
if it helps at all, here are the settings we are using in production with 32bit 
RHEL5:

http://lso.umsystem.edu/~pottingerhj/article/25/dspace-3-tomcat-tweaks

--Hardy

Sent from my iPad

On Jun 26, 2013, at 7:17 AM, Hilton Gibson 
hilton.gib...@gmail.commailto:hilton.gib...@gmail.com wrote:

It should allow you to get a proper java dump the next time.
The dump should tell you what happened.
I am not a java expert but it seems like the direction to go.
Personally I have better results regularly using Ubuntu as a server.
Perhaps you should reconsider Redhat EL, I believe it has very old versions of 
software.


On 26 June 2013 13:25, Ady Wahyudi Paundu 
ad...@unhas.ac.idmailto:ad...@unhas.ac.id wrote:

Not yet, but i'm implementing it now...
i'll let you know the result
in the mean time, can you explain what it is for?

TIA
AdyWP

On 06/26/2013 07:27 PM, Hilton Gibson wrote:
Ok.

Have you tried this: 
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S08#Step_8.3_Increase_number_of_open_files_available

Cheers

hg


On 26 June 2013 12:47, Ady Wahyudi Paundu 
ad...@unhas.ac.idmailto:ad...@unhas.ac.id wrote:

here is my machine info:

- dual cpu (xeon 2.2G) IBM machine with 2x8 GB memory
- work only for repository (plus postgredb)
- with modjk to work with apache
- using only xmlui-mirage
- Current JAVA_OPTS=-Xmx8192M -Xms8192M -XX:MaxPermSize=1024M 
-XX:PermSize=1024M -XX:+UseParallelGC -XX:-UseLoopPredicate 
-Dfile.encoding=UTF-8 -Dcom.sun.management.jmxremote=true
- OS: RedHat Enterprise 5.6 64 bit
- DSpace 3.1



Thanks
AdyWP





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Re: [Dspace-tech] another unscheduled shutdown

2013-06-26 Thread Andrea Schweer 
I've had problems with Java 7 on a RHEL box (RHEL 6.4), maybe that's it
here too?

cheers,
Andrea


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Re: [Dspace-tech] another unscheduled shutdown

2013-06-13 Thread ady 
Dear Mr.Wood and Mr.Gibson,
Thank you for the insight, our repo. system hasn't been crashed for a week
now.
I just follow Mr.Gibson suggestion to reduce log file (change all instances
of INFO to ERROR)

Best Regards,
Ady W. Paundu



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Re: [Dspace-tech] another unscheduled shutdown

2013-06-13 Thread helix84 
On Thu, Jun 13, 2013 at 10:02 AM, ady ad...@unhas.ac.id wrote:
 Dear Mr.Wood and Mr.Gibson,
 Thank you for the insight, our repo. system hasn't been crashed for a week
 now.
 I just follow Mr.Gibson suggestion to reduce log file (change all instances
 of INFO to ERROR)

Please, note that by removing the INFO lines from log files, you'll be
unable to generate some statistics later. However, Solr statistics
will still work if you use them.


Regards,
~~helix84

Compulsory reading: DSpace Mailing List Etiquette
https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette

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Re: [Dspace-tech] another unscheduled shutdown

2013-06-13 Thread Ady Wahyudi Paundu 

ouch... but i don't know what else to do...

here is my machine info:
- dual processor IBM machine with 16 GB memory
- work only for repository (plus postgredb)
- with modjk to work with apache
- using only xmlui-mirage
- JAVA_OPTS=-Xmx1024M -Xms512M -XX:MaxPermSize=256M -Dfile.encoding=UTF-8
- OS: RedHat Enterprise 5.6 64 bit

well... i think i will settle with this configuration for now until i 
found a better solution

Thanks Helix

Warm regards,
Ady W. Paundu

On 06/13/2013 04:12 PM, helix84 wrote:
 On Thu, Jun 13, 2013 at 10:02 AM, adyad...@unhas.ac.id  wrote:

 Dear Mr.Wood and Mr.Gibson,
 Thank you for the insight, our repo. system hasn't been crashed for a week
 now.
 I just follow Mr.Gibson suggestion to reduce log file (change all instances
 of INFO to ERROR)
  
 Please, note that by removing the INFO lines from log files, you'll be
 unable to generate some statistics later. However, Solr statistics
 will still work if you use them.


 Regards,
 ~~helix84

 Compulsory reading: DSpace Mailing List Etiquette
 https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette




 
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Re: [Dspace-tech] another unscheduled shutdown

2013-06-13 Thread helix84 
On Thu, Jun 13, 2013 at 10:23 AM, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:
 - dual processor IBM machine with 16 GB memory
 - JAVA_OPTS=-Xmx1024M -Xms512M -XX:MaxPermSize=256M -Dfile.encoding=UTF-8

Since you have 16 GB of memory, you may definitely want to assign
majority of it to Tomcat. You're giving it less than 2 GBs. I
recommend giving it about 14 GB, the rest should be more than enough
for postgres, apache, disk cache and any other processes.

If disk space for log files is a problem, you may want to compress
them or move them to another machine. Most syslog implementations
allow you to do both.


Regards,
~~helix84

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Re: [Dspace-tech] another unscheduled shutdown

2013-06-13 Thread Ady Wahyudi Paundu 

Oh.. can I? lol.. all the reference I read never mention anything above 
2G :)
how about the other two? (Xms and MaxPermSize)

Regards,
Ady W. Paundu

On 06/13/2013 04:47 PM, helix84 wrote:
 On Thu, Jun 13, 2013 at 10:23 AM, Ady Wahyudi Paunduad...@unhas.ac.id  
 wrote:

 - dual processor IBM machine with 16 GB memory
 - JAVA_OPTS=-Xmx1024M -Xms512M -XX:MaxPermSize=256M -Dfile.encoding=UTF-8
  
 Since you have 16 GB of memory, you may definitely want to assign
 majority of it to Tomcat. You're giving it less than 2 GBs. I
 recommend giving it about 14 GB, the rest should be more than enough
 for postgres, apache, disk cache and any other processes.

 If disk space for log files is a problem, you may want to compress
 them or move them to another machine. Most syslog implementations
 allow you to do both.


 Regards,
 ~~helix84

 Compulsory reading: DSpace Mailing List Etiquette
 https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette




 
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Re: [Dspace-tech] another unscheduled shutdown

2013-06-13 Thread Hilton Gibson 
We use 8GB. See:
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S08#Java_environment_settings_used_for_SUNScholar



On 13 June 2013 10:46, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:


 Oh.. can I? lol.. all the reference I read never mention anything above
 2G :)
 how about the other two? (Xms and MaxPermSize)

 Regards,
 Ady W. Paundu

 On 06/13/2013 04:47 PM, helix84 wrote:
  On Thu, Jun 13, 2013 at 10:23 AM, Ady Wahyudi Paunduad...@unhas.ac.id
  wrote:
 
  - dual processor IBM machine with 16 GB memory
  - JAVA_OPTS=-Xmx1024M -Xms512M -XX:MaxPermSize=256M
 -Dfile.encoding=UTF-8
 
  Since you have 16 GB of memory, you may definitely want to assign
  majority of it to Tomcat. You're giving it less than 2 GBs. I
  recommend giving it about 14 GB, the rest should be more than enough
  for postgres, apache, disk cache and any other processes.
 
  If disk space for log files is a problem, you may want to compress
  them or move them to another machine. Most syslog implementations
  allow you to do both.
 
 
  Regards,
  ~~helix84
 
  Compulsory reading: DSpace Mailing List Etiquette
  https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette
 
 


 
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Re: [Dspace-tech] another unscheduled shutdown

2013-06-05 Thread helix84 
On Wed, Jun 5, 2013 at 7:18 AM, Ady Wahyudi Paundu ad...@unhas.ac.id wrote:
 Today i had another automatic shutdown. This is the log last lines taken
 from catalina, dspace and cocoon:

Sorry, there is nothing in these logs that indicates what happened.

It never happened to me that Tomcat shut down spontaneously, although
I have plenty of experience with other cases where it could not
respond to queries. I can give you only general recommendations -
check your diskspace on all used partitions, especially where you
store your log files; check memory usage for each individual JVM
memory spaces/generations and see if any of them fills up after
prolonged use; check file system permissions - it's easiest to run
dspace under the same user as you run tomcat.


Regards,
~~helix84

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Re: [Dspace-tech] another unscheduled shutdown

2013-06-05 Thread Mark H. Wood 
On the assumption that the affected site runs on Linux, one thing to
check is the OOM Killer.  When all memory and swap space is
committed and the kernel is desperate to free some memory, it will
pick a large process and terminate it to reclaim its memory.  Tomcat
tends to be large and in many ways look like a good candidate for
reclamation.  When the OutOfMemory Killer strikes, the process has no
warning and its logs won't show anything.  I don't recall whether the
kernel logs such events.  You can get some useful numbers from 'top'.

If this is happening, then you need one or more of several things:

o  reduce Tomcat's memory demand significantly.  There is a lot of
   advice out there about sizing Tomcat's memory, some of it better
   than others.  If Tomcat's heap bloats up to tremendous size and
   then sheds much committed space during infrequent garbage
   collections, try reducing the heap size until you get small garbage
   collections at intervals of a few minutes.  Any more heap than that
   is probably unnecessary, unless your load is *very* bursty.  Small
   GCs are cheap and we can afford to have them frequently.

   I try to keep the heap startup size slightly larger than the
   steady-state committed size and the heap maximum about twice that.
   A monitor such as Psi Probe helps to get these numbers, and is good
   to glance at regularly to understand loads and trends.

o  migrate some other large services to some other machine, to free up
   memory.

o  install more memory.  You can temporarily alleviate the problem
   with more swap space, but swapping is slow.  Normally the swap
   space should be very little used.  Add memory until every essential
   process fits, you have a comfortable margin in free space and I/O
   buffers, and swap space is mostly or entirely unused.

Other things to look for would be hardware errors that destroy the
process somehow.  Is the kernel logging oopses, severe I/O errors,
or the like?  You might have memory or interconnect issues.

-- 
Mark H. Wood, Lead System Programmer   mw...@iupui.edu
Machines should not be friendly.  Machines should be obedient.


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Re: [Dspace-tech] another unscheduled shutdown

2013-06-05 Thread Hilton Gibson 
Here are some of the optimisations I did on an Ubuntu 10.04 LTS server:
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Optimisations
Hope it helps.


On 5 June 2013 15:04, Mark H. Wood mw...@iupui.edu wrote:

 On the assumption that the affected site runs on Linux, one thing to
 check is the OOM Killer.  When all memory and swap space is
 committed and the kernel is desperate to free some memory, it will
 pick a large process and terminate it to reclaim its memory.  Tomcat
 tends to be large and in many ways look like a good candidate for
 reclamation.  When the OutOfMemory Killer strikes, the process has no
 warning and its logs won't show anything.  I don't recall whether the
 kernel logs such events.  You can get some useful numbers from 'top'.

 If this is happening, then you need one or more of several things:

 o  reduce Tomcat's memory demand significantly.  There is a lot of
advice out there about sizing Tomcat's memory, some of it better
than others.  If Tomcat's heap bloats up to tremendous size and
then sheds much committed space during infrequent garbage
collections, try reducing the heap size until you get small garbage
collections at intervals of a few minutes.  Any more heap than that
is probably unnecessary, unless your load is *very* bursty.  Small
GCs are cheap and we can afford to have them frequently.

I try to keep the heap startup size slightly larger than the
steady-state committed size and the heap maximum about twice that.
A monitor such as Psi Probe helps to get these numbers, and is good
to glance at regularly to understand loads and trends.

 o  migrate some other large services to some other machine, to free up
memory.

 o  install more memory.  You can temporarily alleviate the problem
with more swap space, but swapping is slow.  Normally the swap
space should be very little used.  Add memory until every essential
process fits, you have a comfortable margin in free space and I/O
buffers, and swap space is mostly or entirely unused.

 Other things to look for would be hardware errors that destroy the
 process somehow.  Is the kernel logging oopses, severe I/O errors,
 or the like?  You might have memory or interconnect issues.

 --
 Mark H. Wood, Lead System Programmer   mw...@iupui.edu
 Machines should not be friendly.  Machines should be obedient.


 --
 How ServiceNow helps IT people transform IT departments:
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JS Gericke Library
Room 1025C
Stellenbosch University
Private Bag X5036
Stellenbosch
7599
South Africa

Tel: +27 21 808 4100 | Cell: +27 84 646 4758
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