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Heap Memory
by sortiz
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We are programming an application that requires to work with 3 Gb of heap
memory from a java virtual machine but, in spite we had prove with the Xmx parameter in order to obtain the said necessary memory level, we had only obtained 64 Mb (we had used MemoryMXBean and MemoryUsage in order to know the disposed memory level) Please, would you tell us how to increase the heap memory level at the java virtual machine? --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@... |
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Re: Heap Memory
by Bharath Mundlapudi
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I am assuming you are programming your application on Glassfish?
Please refer heap sizing section here http://java.sun.com/performance/reference/whitepapers/tuning.html Also you may want to refer, http://java.sun.com/docs/hotspot/HotSpotFAQ.html#gc_heap_32bit You can increase the heap size with -Xmx jvm option. -Bharath >We are programming an application that requires to work with 3 Gb of heap >memory from a java virtual machine but, in spite we had prove with the >Xmx parameter in order to obtain the said necessary memory level, we had >only obtained 64 Mb (we had used MemoryMXBean and MemoryUsage in order to >know the disposed memory level) > >Please, would you tell us how to increase the heap memory level at the >java virtual machine? > > > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: dev-unsubscribe@... >For additional commands, e-mail: dev-help@... > > > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@... |
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Re: Heap Memory
by sortiz
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Hi Bharath
Yes, we work with Glassfish and Netbeans. We tried to increase heap java memory with -Xmx jvm option but we can't increase more than 64MB Working directly with Netbeans heap memory increase to 1024MB, but not without Netbeans. Maybe we must change another jvm option? thanks Susana. > I am assuming you are programming your application on Glassfish? > > Please refer heap sizing section here > http://java.sun.com/performance/reference/whitepapers/tuning.html > > Also you may want to refer, > http://java.sun.com/docs/hotspot/HotSpotFAQ.html#gc_heap_32bit > > You can increase the heap size with -Xmx jvm option. > > -Bharath > >>We are programming an application that requires to work with 3 Gb of >> heap >>memory from a java virtual machine but, in spite we had prove with the >>Xmx parameter in order to obtain the said necessary memory level, we had >>only obtained 64 Mb (we had used MemoryMXBean and MemoryUsage in order to >>know the disposed memory level) >> >>Please, would you tell us how to increase the heap memory level at the >>java virtual machine? >> >> >> >> >>--------------------------------------------------------------------- >>To unsubscribe, e-mail: dev-unsubscribe@... >>For additional commands, e-mail: dev-help@... >> >> >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscribe@... > For additional commands, e-mail: dev-help@... > > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@... |
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Re: Heap Memory
by Bharath Mundlapudi
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Did you try setting -Xms (Min Heap Size) to be equal to -Xmx (Max Heap Size)? Lets say you wanted 1024MB for your application then you can set -Xms 1024m -Xmx 1024m. This forces the JVM to commit 1024MB upon startup. If you don't set -Xms then JVM commits whatever application requires and but allowed to max till -Xmx heap size. In your current case, your application might be using 64MB upon startup and allowed to grow till -Xmx heap size. But you can force JVM to allocate/commit the initial memory you want with -Xms. Still, the maximum memory required for your application is controlled by -Xmx. If you want to verify this, you can use jconsole (memory tab) to see used memory vs committed memory for your application. Let us know if you have more questions, -Bharath Glassfish http://www.sun.com/software/products/appsrvr/support.jsp Hi Bharath Yes, we work with Glassfish and Netbeans. We tried to increase heap java memory with -Xmx jvm option but we can't increase more than 64MB Working directly with Netbeans heap memory increase to 1024MB, but not without Netbeans. Maybe we must change another jvm option? thanks Susana.I am assuming you are programming your application on Glassfish? Please refer heap sizing section here http://java.sun.com/performance/reference/whitepapers/tuning.html Also you may want to refer, http://java.sun.com/docs/hotspot/HotSpotFAQ.html#gc_heap_32bit You can increase the heap size with -Xmx jvm option. -BharathWe are programming an application that requires to work with 3 Gb of heap memory from a java virtual machine but, in spite we had prove with the Xmx parameter in order to obtain the said necessary memory level, we had only obtained 64 Mb (we had used MemoryMXBean and MemoryUsage in order to know the disposed memory level) Please, would you tell us how to increase the heap memory level at the java virtual machine? --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@...--------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@...--------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@... |
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Re: Heap Memory
by sortiz
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Thanks Bharath,
We know this parameters, in fact we setting this two parameters and nothing. We think that we are setting in a mistaken place, because anything happens. We change values with Sun Java System Application Server. We change Application Server > JVM Settings > JVM Options and then we add two options: -Xms1024m and -Xmx1024m. After that, we shutdown the application server but ... anything! the heap memory is 64M. what do you think? Susana > Hi Susana, > > Did you try setting -Xms (Min Heap Size) to be equal to -Xmx > (Max Heap Size)? > > Lets say you wanted 1024MB for your application then you can set -Xms > 1024m -Xmx 1024m. This forces the JVM to commit 1024MB upon startup. If > you don't set -Xms then JVM commits whatever application requires and > but allowed to max till -Xmx heap size. > > In your current case, your application might be using 64MB upon startup > and allowed to grow till -Xmx heap size. But you can force JVM to > allocate/commit the initial memory you want with -Xms. Still, the > maximum memory required for your application is controlled by -Xmx. > > If you want to verify this, you can use jconsole (memory tab) to see > used memory vs committed memory for your application. > > Let us know if you have more questions, > -Bharath > > Glassfish > http://www.sun.com/software/products/appsrvr/support.jsp > > > >>Hi Bharath >> >> Yes, we work with Glassfish and Netbeans. We tried to increase heap java >>memory with -Xmx jvm option but we can't increase more than 64MB >> >> Working directly with Netbeans heap memory increase to 1024MB, but not >>without Netbeans. >> >> Maybe we must change another jvm option? >> >> thanks >> >> Susana. >> >> >> >>>I am assuming you are programming your application on Glassfish? >>> >>>Please refer heap sizing section here >>>http://java.sun.com/performance/reference/whitepapers/tuning.html >>> >>>Also you may want to refer, >>>http://java.sun.com/docs/hotspot/HotSpotFAQ.html#gc_heap_32bit >>> >>>You can increase the heap size with -Xmx jvm option. >>> >>>-Bharath >>> >>> >>> >>>>We are programming an application that requires to work with 3 Gb of >>>>heap >>>>memory from a java virtual machine but, in spite we had prove with the >>>>Xmx parameter in order to obtain the said necessary memory level, we >>>> had >>>>only obtained 64 Mb (we had used MemoryMXBean and MemoryUsage in order >>>> to >>>>know the disposed memory level) >>>> >>>>Please, would you tell us how to increase the heap memory level at the >>>>java virtual machine? >>>> >>>> >>>> >>>> >>>>--------------------------------------------------------------------- >>>>To unsubscribe, e-mail: dev-unsubscribe@... >>>>For additional commands, e-mail: dev-help@... >>>> >>>> >>>> >>>> >>>> >>>--------------------------------------------------------------------- >>>To unsubscribe, e-mail: dev-unsubscribe@... >>>For additional commands, e-mail: dev-help@... >>> >>> >>> >>> >> >> >> >>--------------------------------------------------------------------- >>To unsubscribe, e-mail: dev-unsubscribe@... >>For additional commands, e-mail: dev-help@... >> >> >> > > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@... |
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Re: Heap Memory
by Claudio Miranda
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Can you please, run those commands after glassfish startup, and paste
the results here. - jinfo PID - jmap -heap PID Where PID is the glassfish process id = if solaris prstat -s rss /usr/sbin/prtconf | grep Memory = if linux free top (then press shift M to sort by memory use) Also, attach the domains/domain/domain.xml Thanks Claudio Miranda On Wed, Jul 9, 2008 at 2:12 PM, <sortiz@...> wrote: > Thanks Bharath, > > We know this parameters, in fact we setting this two parameters and > nothing. We think that we are setting in a mistaken place, because > anything happens. We change values with Sun Java System Application > Server. > > We change Application Server > JVM Settings > JVM Options and then we add > two options: -Xms1024m and -Xmx1024m. > > After that, we shutdown the application server but ... anything! the heap > memory is 64M. -- Claudio Miranda _______________________________________________ --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@... For additional commands, e-mail: dev-help@... |
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