IO performance of multithreaded app
In a multithreaded app there are N threads. These threads produce some data and write to disk. The data is written on disk in following two ways:
1. Each thread is writing data to a different file.(All files are on same disk)
2. All threads write data to a single file.
After running some tests the results show that 2nd case takes 20% more time than 1st.
I want to know the actual reason the this, whether there is some parallel io happening, or some other reason.
Vinit.
Hi Vinit,
Assuming that you have set thread councurrency level to a proper value, a simple reason is that writing to a file involves locking the corresponding inode. So if all your threads are writing to the same file , there is a chance that the LWPs corresponding to your user threads sleep inside the kernel for the lock on the inode . This will reduce the performance.
BTW , you didn't give your machine configuration ..
Thanks,
Prajeesh
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I have a multithreaded app that refers stock price and suggest end user upon the availability, as of now it was running as a Swing app. we are thinking of porting it on web. So how can a end user access this Stock price screener using webservices ?
Here are my challenges :
1. I cannot deploy it in J2ee Webserver as they are managed environment.
2. We have not yet migrated to jdk1.6 ( WE WILL DO THAT NEXT YR DEPENDING HOW THE PRODUCT IS PERFORMING)
So how can this be acheived in a strict(ideal) j2ee environment.
My boss is strict about J2ee standard, I donot know how to implement this in budget n time ??
I am really scratching my head about the same for an hour n so I have not find a decent answer on web also. Is it that violting the basic rule of j2ee is the only way out. ("don't sponge a thread in a managed environment" ). I know there are software that are running thread with in like log4j but they have special grant to run not my application.
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I would have failed you in the interview for the garrulous verbosity of writing Boolean.TRUE.equals, which can be completely omitted, and Boolean.FALSE.equals, which can be replaced by !.Students learn what in the books, and lot of java books I see using the same style:
http://books.google.com/books?id=DXYZZVlWOAkC&pg=PA286&dq=Boolean.TRUE.equals%28&hl=en&sa=X&ei=i31sT8jdJonh0QH01-jyBg&ved=0CDIQ6AEwAA#v=onepage&q=Boolean.TRUE.equals%28&f=false
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Oracle 9.2.0.5
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if (counter++ <= 0)
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/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(nnfsn2a+0x66) [0x403bc310]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(niqname+0x18a) [0x40365a1a]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(kwfnran+0x11f) [0x402d5df7]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(kwfcinit+0x177) [0x402a9155]
/u/app/oracle/product/9.2.0/lib/libclntsh.so.9.0(kpuatch+0x834) [0x4014f7d2]
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Performance of Pro apps on MacBook Retina?
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Is this graphs are for normal performance or the app leaking the memory ?!!
Hey there,
I'm new to java profiling and testing and I faced some hang ups so i made some fixes to my code .
It's medium sized application and i captured some shots of the Memory Heap, Memory GC, Threads/Loaded classes Graphs From NetBeans Profiler.
If any one may see them and say if this is normal performance or I need some more fixing in the come.
Note that the graphs are captured when I was doing Load Test on the program
The Memory Heap Graphs
http://islamelhosary.mufix.org/profiler/3.png
http://islamelhosary.mufix.org/profiler/4.png
http://islamelhosary.mufix.org/profiler/7.png
The Memory GC Graphs
http://islamelhosary.mufix.org/profiler/2.png
http://islamelhosary.mufix.org/profiler/5.png
http://islamelhosary.mufix.org/profiler/8.png
The Threads/Loaded classes Graphs
http://islamelhosary.mufix.org/profiler/1.png
http://islamelhosary.mufix.org/profiler/6.png
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JDO Logging with MultiThreaded apps
I am having a HUGE problem w/ JDO displaying every SQL INFO statement to
the screen. I have my log4j.properties file setup as follows
log4j.rootCategory=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.SQL=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.JDBC=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.Schema=ERROR, console
log4j.category.com.solarmetric.kodo.Performance=ERROR, console
log4j.category.com.solarmetric.kodo.MetaData=ERROR, console
log4j.category.com.solarmetric.kodo.Enhance=ERROR, console
log4j.category.com.solarmetric.kodo.Query=ERROR, console
log4j.category.com.solarmetric.kodo.Runtime=ERROR, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
And this works fine for a single threaded application, however if that
application spawns any threads, those threads write everything imaginable
to the screen, as though I had everything in my log4j.properties set to
=INFO.
This is really, really annoying for debugging purposes, I have no idea
where to go with this
And yes my kodo.properties file has multithreaded=true
I am also using JUnit to run these tests, FYI
Thanks in advance for any helpWe are spawning these threads within our application and we see the same
behavior when launched from the command line.
Here is my logging.properties:
# Specify the handlers to create in the root logger
# (all loggers are children of the root logger)
# The following creates two handlers
handlers=java.util.logging.ConsoleHandler, java.util.logging.FileHandler
# Set the default logging level for the root logger
..level=ALL
# Set the default logging level for new ConsoleHandler instances
java.util.logging.ConsoleHandler.level=ERROR
# Set the default logging level for new FileHandler instances
java.util.logging.FileHandler.level=ALL
# Set the default formatter for new ConsoleHandler instances
java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
# Set the default logging level for all Kodo logs to ERROR
com.solarmetric.kodo.impl.jdbc.SQL.level=ERROR
com.solarmetric.kodo.impl.jdbc.JDBC.level=ERROR
com.solarmetric.kodo.impl.jdbc.Schema.level=ERROR
com.solarmetric.kodo.Performance.level=ERROR
com.solarmetric.kodo.MetaData.level=ERROR
com.solarmetric.kodo.Enhance.level=ERROR
com.solarmetric.kodo.Query.level=ERROR
com.solarmetric.kodo.Runtime.level=ERROR
Here is my log4j.properties:
log4j.rootCategory=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.SQL=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.JDBC=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.Schema=ERROR, console
log4j.category.com.solarmetric.kodo.Performance=ERROR, console
log4j.category.com.solarmetric.kodo.MetaData=ERROR, console
log4j.category.com.solarmetric.kodo.Enhance=ERROR, console
log4j.category.com.solarmetric.kodo.Query=ERROR, console
log4j.category.com.solarmetric.kodo.Runtime=ERROR, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
And yet, I still get this output( from just a few seconds of runtime)
sed=209;params={(long)21102}]
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=643;size=10;max
=70;hits=632;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=643;size=10;max=70
;hits=632;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=210;params={(long)21103}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=644;size=10;max
=70;hits=633;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=644;size=10;max=70
;hits=633;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=211;params={(long)21104}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=645;size=10;max
=70;hits=634;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=212;params={(long)22155}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=211;params={(long)22205}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=213;params={(long)22156}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=212;params={(long)22206}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=214;params={(long)22157}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=213;params={(long)22207}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=215;params={(long)22158}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=214;params={(long)22208}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=216;params={(long)22159}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=215;params={(long)22209}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=655;size=10;max=70
;hits=644;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=212;params={(long)21105}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=656;size=10;max
=70;hits=645;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=656;size=10;max=70
;hits=645;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=213;params={(long)21106}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=657;size=10;max
=70;hits=646;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=657;size=10;max=70
;hits=646;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=214;params={(long)21107}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=658;size=10;max
=70;hits=647;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=658;size=10;max=70
;hits=647;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=215;params={(long)21108}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=659;size=10;max
=70;hits=648;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=659;size=10;max=70
;hits=648;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=216;params={(long)21109}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=660;size=10;max
=70;hits=649;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=217;params={(long)22160}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=216;params={(long)22210}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=218;params={(long)22161}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=217;params={(long)22211}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=219;params={(long)22162}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=218;params={(long)22212}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=220;params={(long)22163}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=219;params={(long)22213}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <18423897>:
[re used=221;params={(long)22164}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:14008569; T:26117441; D:23582715 ] executing statement <10141941>:
[re used=220;params={(long)22214}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=670;size=10;max=70
;hits=659;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=217;params={(long)21110}] Jun 30, 2003 3:35:20 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 15ms Jun 30, 2003
3:35:20 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=671;size=10;max
=70;hits=660;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]]
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 11.157 sec Jun
30, 2003 3:35:21 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=671;size=10;max=70
;hits=660;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:21 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=218;params={(long)21111}] Jun 30, 2003 3:35:21 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:21 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms Jun 30, 2003
3:35:21 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] return
[com.solarmetric.datasource.
PoolConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dat
asou
rce.PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595
8617
,wrapped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=672;size=10;max
=70;hits=661;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0
to [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3 ; taken=2]] Jun 30, 2003 3:35:21 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] get
[com.solarmetric.datasource.Poo
lConnection@19da967[identityHashCode:16658781,wrapped:com.solarmetric.dataso
urce
..PreparedStatementCache$CacheAwareConnection@19da967[identityHashCode:595861
7,wr
apped:oracle.jdbc.driver.OracleConnection@19da967]:
[requests=672;size=10;max=70
;hits=661;created=11;redundant=0;overflow=0;new=11;leaked=0;unavailable=0]]]
fro m [com.solarmetric.datasource.DataSourceImpl$SortablePool[min=3; max=10;
size=3; taken=1]] Jun 30, 2003 3:35:21 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] executing statement <2622421>:
[reu sed=219;params={(long)21112}] Jun 30, 2003 3:35:21 PM
com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] begin rollback
Jun 30, 2003 3:35:21 PM com.solarmetric.datasource.DataSourceImpl log
INFO: [ C:27109735; T:26117441; D:23582715 ] end rollback 0ms
"Patrick Linskey" <[email protected]> wrote in message
news:[email protected]...
Are you spawning the threads, or is JUnit forking off to start the
threads?
I suspect that you are using junit to create the threads, and the
classpath that the junit task is seeing does not have log4j.properties in
the classpath.
Can you ensure that the log4j.properties file is in the classpath that the
threads that are logging are using?
Alternately, configure the apace commons logging framework to use their
built-in simple logger and configure the simple logger via its
system-properties-based configuration capabilities.
-Patrick
On Fri, 27 Jun 2003 20:56:39 +0000, Damian Bradicich wrote:
I am having a HUGE problem w/ JDO displaying every SQL INFO statement to
the screen. I have my log4j.properties file setup as follows
log4j.rootCategory=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.SQL=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.JDBC=ERROR, console
log4j.category.com.solarmetric.kodo.impl.jdbc.Schema=ERROR, console
log4j.category.com.solarmetric.kodo.Performance=ERROR, console
log4j.category.com.solarmetric.kodo.MetaData=ERROR, console
log4j.category.com.solarmetric.kodo.Enhance=ERROR, console
log4j.category.com.solarmetric.kodo.Query=ERROR, console
log4j.category.com.solarmetric.kodo.Runtime=ERROR, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
And this works fine for a single threaded application, however if that
application spawns any threads, those threads write everything
imaginable
to the screen, as though I had everything in my log4j.properties set to
=INFO.
This is really, really annoying for debugging purposes, I have no idea
where to go with this
And yes my kodo.properties file has multithreaded=true
I am also using JUnit to run these tests, FYI
Thanks in advance for any help--
Patrick Linskey
SolarMetric Inc. -
IOS worse performance when other apps in background OS
Hello,
I have seen this asked before. I notice my application is not quite as smooth when other apps are alive in the background of iOS.
I am guessing it's simply running low on ram and there is nothing i can do about it? I am rendering in GPU
if i close some or all, it runs fine.I think the problem is this: when doing parallel DML, Oracle uses direct path reads to read the data. To make sure the data being read is consistent though it needs to checkpoint blocks it is going to read. CR enqueue seems to be used to synchronize CKPT with PX slaves reading the data. It's going like this: PX slave requests CKPT to checkpoint a range of blocks it's about to read (and possibly enqueues on CR in order to be able to do so,) CKPT in turn orders DBWR to write all dirty blocks in the requested range, waits for this write to complete and signals PX slave that the blocks are consistent and can be read. Repeat as necessary. Now, with really large buffer cache and good portion of it dirty due to recent DML on source tables, busy CPUs and relatively slow writes this checkpointing might build up into a major performance inhibitor when these recently touched tables are being read in direct path mode: you have 8 cores and 8 parallel slaves, so CKPT, DBWR and pretty much all other background processes are competing with them for CPU time and I/O bandwidth (they all have the same priority, so your PX slaves can easily evict CKPT or DBWR from CPU only to immediately go back to sleep on an enqueue held by a process it just preempted.)
Things to try here:
1. do a checkpoint before running the insert and see if this makes any difference;
2. lower the degree of parallelism to 5-6;
3. If you have more than one DBWR configured - configure db_writer_processes back to 1. -
What are the main things to do when optimizing the performance of Java App
what are the main things to do when optimizing the performance of Java App
what are the main things to do when optimizing the performance of Java App
-
JNI_CreateJavaVM fails in Multithreaded app.
Hello,
when i call JNI_CreateJavaVM in a multithreaded application, I ll get the error:
"ERROR: Could not find the pthread library (2). Are you running a supported Linux
distribution?"
So, given the following program, everyhing works okay:
----code---
#include "jni.h"
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
void jnicall()
JNIEnv *env;
JavaVM *jvm;
jint res;
jclass cls;
jmethodID mid;
jstring jstr;
jclass stringClass;
jobjectArray args;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
options[0].optionString = "-Djava.class.path=.";
vm_args.version = 0x00010002;
vm_args.options = options;
vm_args.nOptions = 1;
vm_args.ignoreUnrecognized = JNI_TRUE;
res = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
if (res < 0) {
fprintf(stderr, "Can't create Java VM\n");
exit(1);
cls = env->FindClass("Hello");
if (cls == NULL) {
goto destroy;
mid = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");
if (mid == NULL) {
goto destroy;
jstr = env->NewStringUTF(" from C!");
if (jstr == NULL) {
goto destroy;
stringClass = env->FindClass("java/lang/String");
args = env->NewObjectArray(1, stringClass, jstr);
if (args == NULL) {
goto destroy;
env->CallStaticVoidMethod(cls, mid, args);
destroy:
if (env->ExceptionOccurred()) {
env->ExceptionDescribe();
jvm->DestroyJavaVM();
int main()
jnicall();
---code---
But when I replace main with something like
---code---
int main()
pthread_t thread;
if (0 != pthread_create(&thread, NULL, (void*(*)(void*))jnicall, NULL))
fprintf(stderr, "Cannot create thread");
exit(1);
---code---
Really strange is that is does not matter, how i use pthread functions: even if
i call the jnicall function directly from main but start a different thread using
pthread_create, i get this method too:
---code---
int main()
pthread_t thread;
jnicall();
if (0 != pthread_create(&thread, NULL, (void*(*)(void*))some_other_thread_without_jni,
NULL))
fprintf(stderr, "Cannot create thread");
exit(1);
---code---
My system is a Suse Linux Enterprise Server 8.0 (wth United Linux 1.0) (kernel
2.4.19, glibc is 2.2.5); the Jrockit stuff is JRockit 8.1 SP 2
Any ideas?
TIA,
JohannesTry checking that the environment variable LD_ASSUME_KERNEL=2.2.5 is not
set.
From the release notes at:
http://edocs.bea.com/wljrockit/docs81/relnotes/relnotes.html#1041981
Best Regards,
Josefin Hallberg
BEA WebLogic JRockit
Customer Centric Engineering
"Johannes Hampel" <[email protected]> wrote in message
news:[email protected]...
>
Hello,
when i call JNI_CreateJavaVM in a multithreaded application, I ll getthe error:
"ERROR: Could not find the pthread library (2). Are you running asupported Linux
distribution?"
So, given the following program, everyhing works okay:
----code---
#include "jni.h"
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
void jnicall()
JNIEnv *env;
JavaVM *jvm;
jint res;
jclass cls;
jmethodID mid;
jstring jstr;
jclass stringClass;
jobjectArray args;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
options[0].optionString = "-Djava.class.path=.";
vm_args.version = 0x00010002;
vm_args.options = options;
vm_args.nOptions = 1;
vm_args.ignoreUnrecognized = JNI_TRUE;
res = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
if (res < 0) {
fprintf(stderr, "Can't create Java VM\n");
exit(1);
cls = env->FindClass("Hello");
if (cls == NULL) {
goto destroy;
mid = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");
if (mid == NULL) {
goto destroy;
jstr = env->NewStringUTF(" from C!");
if (jstr == NULL) {
goto destroy;
stringClass = env->FindClass("java/lang/String");
args = env->NewObjectArray(1, stringClass, jstr);
if (args == NULL) {
goto destroy;
env->CallStaticVoidMethod(cls, mid, args);
destroy:
if (env->ExceptionOccurred()) {
env->ExceptionDescribe();
jvm->DestroyJavaVM();
int main()
jnicall();
---code---
But when I replace main with something like
---code---
int main()
pthread_t thread;
if (0 != pthread_create(&thread, NULL, (void*(*)(void*))jnicall,NULL))
fprintf(stderr, "Cannot create thread");
exit(1);
---code---
Really strange is that is does not matter, how i use pthread functions:even if
i call the jnicall function directly from main but start a differentthread using
pthread_create, i get this method too:
---code---
int main()
pthread_t thread;
jnicall();
if (0 != pthread_create(&thread, NULL,(void*(*)(void*))some_other_thread_without_jni,
NULL))
fprintf(stderr, "Cannot create thread");
exit(1);
---code---
My system is a Suse Linux Enterprise Server 8.0 (wth United Linux 1.0)(kernel
2.4.19, glibc is 2.2.5); the Jrockit stuff is JRockit 8.1 SP 2
Any ideas?
TIA,
Johannes
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