Memory usage in XP (memory leak detection)
in [Windows XP]
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From: Pegasus [MVP] on 6 Aug 2010 09:23 "Markus Moeller" <huaraz(a)moeller.plus.com> wrote in message news:4B36629B-EDB1-4807-8297-AB985A9206DA(a)microsoft.com... > But the result is the same. If I add all memory used by the processes it > is less than the total used. I get 1688344 Kbytes from the taskmanager > and committed are 2683666 Kbytes. Where does the rest (> 1GB) go ? > > Markus If you have a memory leak then one the programs in list will consume increasing amounts of memory. Take a snapshot in Task Manager twice a day, then compare the figures. If they remain much the same then you do not have a memory leak.
From: John John - MVP on 6 Aug 2010 10:27 Markus Moeller wrote: > Maybe it is my wording or misunderstanding. When I open the task > manager I see Total and Available memory This is the 'physical memory' (RAM) usage. > and the difference is Committed > memory This is 'virtual memory' (not RAM) usage but the figures can be completely misleading because all virtual memory allocation, whether used or not, 'maps' through the page file, this is sort of a trick that Windows uses to give the illusion of nearly unlimited available memory to applications. This (Commit Charge) is pagefile 'backed' memory but as long as there is available physical memory (RAM) the pagefile is not necessarily used for anything other than virtual memory mapping. Only if the pagefile itself (not the commit charge) is actually growing can you suspect a memory leak by an application, this is called a "Paged Pool" leak, usually one will notice the increased pagefile usage with an increasing sluggishness of the machine. As the application 'leaks' or consumes more memory Windows pages out RAM pages to the Pagefile, hence the name, a "Paged Pool" leak, the memory leaks to the pagefile. You can monitor the pagefile with the corresponding Perfmon counter or you can use Doug Knox's PageFileMon utility: http://www.dougknox.com/xp/utils/xp_pagefilemon.htm By contrast "Non Paged Pool" leaks occur in areas of memory which cannot be paged out so these leaks consume an increasing amount of RAM without any increase in the size of the pagefile. These leaks are quite serious, most often they are caused by buggy drivers and they eventually cripple the machine and cause it to hang completely, fortunately these leaks are rather rare. > and always < Total Memory or ? But when I add up the Memory > Usage( = Working set ?) of all processes in the tasklist I get after a > week or so 1GB less then the committed memory and have to reboot. Why do you have to reboot? Does the machine become sluggish or unresponsive? Or are you rebooting just for the sake of seeing the Commit Charge come down? > When I > boot up the memory usage sum and committed memory is about the same. You have to understand the concept of Virtual Memory and how it differs from actual physical memory to get a grasp on these Task Manager figures. John > Markus > > "John John - MVP" <audetweld(a)nbnet.nb.ca> wrote in message > news:OJqJwiVNLHA.2064(a)TK2MSFTNGP02.phx.gbl... >> I have a feeling that we may be chasing a non existent problem... The >> Task Manager's Commit counters are Virtual Memory counters and they >> can be quite misleading. >> >> John >> >> Markus Moeller wrote: >>> But the result is the same. If I add all memory used by the processes >>> it is less than the total used. I get 1688344 Kbytes from the >>> taskmanager and committed are 2683666 Kbytes. Where does the rest (> >>> 1GB) go ? >>> >>> Markus >>> >>> >>> "Pegasus [MVP]" <news(a)microsoft.com> wrote in message >>> news:OTAaToUNLHA.4968(a)TK2MSFTNGP02.phx.gbl... >>>> "Markus Moeller" <huaraz(a)moeller.plus.com> wrote in message >>>> news:AD63D158-331C-4CD0-94B8-09684987910A(a)microsoft.com... >>>>> Hi >>>>> >>>>> How can I found out the memory usage on XP ? My XP box uses over a >>>>> week all memory and then has no resources available. It has 4GB >>>>> memory (3.5 GB free) >>>>> >>>>> I used typeperf with the following: >>>>> >>>>> \Memory\Available Bytes >>>>> \Memory\Committed Bytes >>>>> \Memory\Pool Paged Bytes >>>>> \Memory\Pool Nonpaged Bytes >>>>> \Memory\Cache Bytes >>>>> \Memory\Cache Bytes Peak >>>>> \Process(_total)\Virtual Bytes Peak >>>>> \Process(_total)\Virtual Bytes >>>>> \Process(_total)\Working Set Peak >>>>> \Process(_total)\Working Set >>>>> \Process(_total)\Page File Bytes Peak >>>>> \Process(_total)\Page File Bytes >>>>> \Process(_total)\Private Bytes >>>>> \Process(_total)\Pool Paged Bytes >>>>> \Process(_total)\Pool Nonpaged Bytes >>>>> \Process(_total)\Working Set - Private >>>>> \Process(_total)\Page Faults/sec >>>>> \Process(_total)\Handle Count >>>>> >>>>> But when I add up Pool Paged Bytes, Pool Nonpaged Bytes, >>>>> \Process(_total)\Working Set I do net reach the Committed bytes >>>>> value by 1 GB or more when the machine has to be rebooted. >>>>> >>>>> What is the best way to find out which process is using it ? >>>>> >>>>> Thank you >>>>> Markus >>>>> >>>> >>>> The Task Manager will tell you. Just click the Processes tab, then >>>> click on the Memory column header so that the entries are sorted by >>>> memory usage. You also need to click the box "Show processes for all >>>> users" at the bottom. >>> >
From: Markus Moeller on 6 Aug 2010 10:40 Hi John, Thank you for the good explanation, which I have to digest now ;-) I have to reboot the machine as I get errors of no resource available and scheduled jobs don't run anymore ( I have to delete the keys in ...\Crypto\RSA\S-1-5-18\* as they got corrupted), application have issues and it coincides that my available physical memory goes to zero. Markus "John John - MVP" <audetweld(a)nbnet.nb.ca> wrote in message news:%23rpr9NXNLHA.5624(a)TK2MSFTNGP02.phx.gbl... > Markus Moeller wrote: > >> Maybe it is my wording or misunderstanding. When I open the task manager >> I see Total and Available memory > > This is the 'physical memory' (RAM) usage. > > >> and the difference is Committed memory > > This is 'virtual memory' (not RAM) usage but the figures can be completely > misleading because all virtual memory allocation, whether used or not, > 'maps' through the page file, this is sort of a trick that Windows uses to > give the illusion of nearly unlimited available memory to applications. > This (Commit Charge) is pagefile 'backed' memory but as long as there is > available physical memory (RAM) the pagefile is not necessarily used for > anything other than virtual memory mapping. > > Only if the pagefile itself (not the commit charge) is actually growing > can you suspect a memory leak by an application, this is called a "Paged > Pool" leak, usually one will notice the increased pagefile usage with an > increasing sluggishness of the machine. As the application 'leaks' or > consumes more memory Windows pages out RAM pages to the Pagefile, hence > the name, a "Paged Pool" leak, the memory leaks to the pagefile. You can > monitor the pagefile with the corresponding Perfmon counter or you can use > Doug Knox's PageFileMon utility: > http://www.dougknox.com/xp/utils/xp_pagefilemon.htm > > By contrast "Non Paged Pool" leaks occur in areas of memory which cannot > be paged out so these leaks consume an increasing amount of RAM without > any increase in the size of the pagefile. These leaks are quite serious, > most often they are caused by buggy drivers and they eventually cripple > the machine and cause it to hang completely, fortunately these leaks are > rather rare. > > >> and always < Total Memory or ? But when I add up the Memory Usage( = >> Working set ?) of all processes in the tasklist I get after a week or >> so 1GB less then the committed memory and have to reboot. > > Why do you have to reboot? Does the machine become sluggish or > unresponsive? Or are you rebooting just for the sake of seeing the Commit > Charge come down? > > >> When I boot up the memory usage sum and committed memory is about the >> same. > > You have to understand the concept of Virtual Memory and how it differs > from actual physical memory to get a grasp on these Task Manager figures. > > John > > >> Markus >> >> "John John - MVP" <audetweld(a)nbnet.nb.ca> wrote in message >> news:OJqJwiVNLHA.2064(a)TK2MSFTNGP02.phx.gbl... >>> I have a feeling that we may be chasing a non existent problem... The >>> Task Manager's Commit counters are Virtual Memory counters and they can >>> be quite misleading. >>> >>> John >>> >>> Markus Moeller wrote: >>>> But the result is the same. If I add all memory used by the processes >>>> it is less than the total used. I get 1688344 Kbytes from the >>>> taskmanager and committed are 2683666 Kbytes. Where does the rest (> >>>> 1GB) go ? >>>> >>>> Markus >>>> >>>> >>>> "Pegasus [MVP]" <news(a)microsoft.com> wrote in message >>>> news:OTAaToUNLHA.4968(a)TK2MSFTNGP02.phx.gbl... >>>>> "Markus Moeller" <huaraz(a)moeller.plus.com> wrote in message >>>>> news:AD63D158-331C-4CD0-94B8-09684987910A(a)microsoft.com... >>>>>> Hi >>>>>> >>>>>> How can I found out the memory usage on XP ? My XP box uses over a >>>>>> week all memory and then has no resources available. It has 4GB >>>>>> memory (3.5 GB free) >>>>>> >>>>>> I used typeperf with the following: >>>>>> >>>>>> \Memory\Available Bytes >>>>>> \Memory\Committed Bytes >>>>>> \Memory\Pool Paged Bytes >>>>>> \Memory\Pool Nonpaged Bytes >>>>>> \Memory\Cache Bytes >>>>>> \Memory\Cache Bytes Peak >>>>>> \Process(_total)\Virtual Bytes Peak >>>>>> \Process(_total)\Virtual Bytes >>>>>> \Process(_total)\Working Set Peak >>>>>> \Process(_total)\Working Set >>>>>> \Process(_total)\Page File Bytes Peak >>>>>> \Process(_total)\Page File Bytes >>>>>> \Process(_total)\Private Bytes >>>>>> \Process(_total)\Pool Paged Bytes >>>>>> \Process(_total)\Pool Nonpaged Bytes >>>>>> \Process(_total)\Working Set - Private >>>>>> \Process(_total)\Page Faults/sec >>>>>> \Process(_total)\Handle Count >>>>>> >>>>>> But when I add up Pool Paged Bytes, Pool Nonpaged Bytes, >>>>>> \Process(_total)\Working Set I do net reach the Committed bytes value >>>>>> by 1 GB or more when the machine has to be rebooted. >>>>>> >>>>>> What is the best way to find out which process is using it ? >>>>>> >>>>>> Thank you >>>>>> Markus >>>>>> >>>>> >>>>> The Task Manager will tell you. Just click the Processes tab, then >>>>> click on the Memory column header so that the entries are sorted by >>>>> memory usage. You also need to click the box "Show processes for all >>>>> users" at the bottom. >>>> >>
From: John John - MVP on 6 Aug 2010 11:57 It might help if you post the error message verbatim. Also look in the Event Viewer log for clues. John Markus Moeller wrote: > Hi John, > > Thank you for the good explanation, which I have to digest now ;-) I > have to reboot the machine as I get errors of no resource available and > scheduled jobs don't run anymore ( I have to delete the keys in > ..\Crypto\RSA\S-1-5-18\* as they got corrupted), application have issues > and it coincides that my available physical memory goes to zero. > > Markus > > "John John - MVP" <audetweld(a)nbnet.nb.ca> wrote in message > news:%23rpr9NXNLHA.5624(a)TK2MSFTNGP02.phx.gbl... >> Markus Moeller wrote: >> >>> Maybe it is my wording or misunderstanding. When I open the task >>> manager I see Total and Available memory >> >> This is the 'physical memory' (RAM) usage. >> >> >>> and the difference is Committed memory >> >> This is 'virtual memory' (not RAM) usage but the figures can be >> completely misleading because all virtual memory allocation, whether >> used or not, 'maps' through the page file, this is sort of a trick >> that Windows uses to give the illusion of nearly unlimited available >> memory to applications. This (Commit Charge) is pagefile 'backed' >> memory but as long as there is available physical memory (RAM) the >> pagefile is not necessarily used for anything other than virtual >> memory mapping. >> >> Only if the pagefile itself (not the commit charge) is actually >> growing can you suspect a memory leak by an application, this is >> called a "Paged Pool" leak, usually one will notice the increased >> pagefile usage with an increasing sluggishness of the machine. As the >> application 'leaks' or consumes more memory Windows pages out RAM >> pages to the Pagefile, hence the name, a "Paged Pool" leak, the memory >> leaks to the pagefile. You can monitor the pagefile with the >> corresponding Perfmon counter or you can use Doug Knox's PageFileMon >> utility: http://www.dougknox.com/xp/utils/xp_pagefilemon.htm >> >> By contrast "Non Paged Pool" leaks occur in areas of memory which >> cannot be paged out so these leaks consume an increasing amount of RAM >> without any increase in the size of the pagefile. These leaks are >> quite serious, most often they are caused by buggy drivers and they >> eventually cripple the machine and cause it to hang completely, >> fortunately these leaks are rather rare. >> >> >>> and always < Total Memory or ? But when I add up the Memory Usage( = >>> Working set ?) of all processes in the tasklist I get after a week >>> or so 1GB less then the committed memory and have to reboot. >> >> Why do you have to reboot? Does the machine become sluggish or >> unresponsive? Or are you rebooting just for the sake of seeing the >> Commit Charge come down? >> >> >>> When I boot up the memory usage sum and committed memory is about the >>> same. >> >> You have to understand the concept of Virtual Memory and how it >> differs from actual physical memory to get a grasp on these Task >> Manager figures. >> >> John >> >> >>> Markus >>> >>> "John John - MVP" <audetweld(a)nbnet.nb.ca> wrote in message >>> news:OJqJwiVNLHA.2064(a)TK2MSFTNGP02.phx.gbl... >>>> I have a feeling that we may be chasing a non existent problem... >>>> The Task Manager's Commit counters are Virtual Memory counters and >>>> they can be quite misleading. >>>> >>>> John >>>> >>>> Markus Moeller wrote: >>>>> But the result is the same. If I add all memory used by the >>>>> processes it is less than the total used. I get 1688344 Kbytes >>>>> from the taskmanager and committed are 2683666 Kbytes. Where does >>>>> the rest (> 1GB) go ? >>>>> >>>>> Markus >>>>> >>>>> >>>>> "Pegasus [MVP]" <news(a)microsoft.com> wrote in message >>>>> news:OTAaToUNLHA.4968(a)TK2MSFTNGP02.phx.gbl... >>>>>> "Markus Moeller" <huaraz(a)moeller.plus.com> wrote in message >>>>>> news:AD63D158-331C-4CD0-94B8-09684987910A(a)microsoft.com... >>>>>>> Hi >>>>>>> >>>>>>> How can I found out the memory usage on XP ? My XP box uses over >>>>>>> a week all memory and then has no resources available. It has >>>>>>> 4GB memory (3.5 GB free) >>>>>>> >>>>>>> I used typeperf with the following: >>>>>>> >>>>>>> \Memory\Available Bytes >>>>>>> \Memory\Committed Bytes >>>>>>> \Memory\Pool Paged Bytes >>>>>>> \Memory\Pool Nonpaged Bytes >>>>>>> \Memory\Cache Bytes >>>>>>> \Memory\Cache Bytes Peak >>>>>>> \Process(_total)\Virtual Bytes Peak >>>>>>> \Process(_total)\Virtual Bytes >>>>>>> \Process(_total)\Working Set Peak >>>>>>> \Process(_total)\Working Set >>>>>>> \Process(_total)\Page File Bytes Peak >>>>>>> \Process(_total)\Page File Bytes >>>>>>> \Process(_total)\Private Bytes >>>>>>> \Process(_total)\Pool Paged Bytes >>>>>>> \Process(_total)\Pool Nonpaged Bytes >>>>>>> \Process(_total)\Working Set - Private >>>>>>> \Process(_total)\Page Faults/sec >>>>>>> \Process(_total)\Handle Count >>>>>>> >>>>>>> But when I add up Pool Paged Bytes, Pool Nonpaged Bytes, >>>>>>> \Process(_total)\Working Set I do net reach the Committed bytes >>>>>>> value by 1 GB or more when the machine has to be rebooted. >>>>>>> >>>>>>> What is the best way to find out which process is using it ? >>>>>>> >>>>>>> Thank you >>>>>>> Markus >>>>>>> >>>>>> >>>>>> The Task Manager will tell you. Just click the Processes tab, then >>>>>> click on the Memory column header so that the entries are sorted >>>>>> by memory usage. You also need to click the box "Show processes >>>>>> for all users" at the bottom. >>>>> >>> >
From: Shenan Stanley on 7 Aug 2010 02:02 Markus Moeller wrote: <snip> > I have to delete the keys in ..\Crypto\RSA\S-1-5-18\* as > they got corrupted <snip> Scheduled Tasks? What scheduled tasks do you have running? -- Shenan Stanley MS-MVP -- How To Ask Questions The Smart Way http://www.catb.org/~esr/faqs/smart-questions.html
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