VMMAP. How to...

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   Прошу тех, кто с ней плотно и регулярно работает, дать мне ответ на такие

вопросы:

1. В верхней части VMMAP есть 3 линейки: Committed, Private Bytes и

Working Set. Что каждая из них обозначает и на которую их этих линеек в

первую очередь стоит обращать внимание, при попытке определить, чем и на

сколько занята виртуальная память, выделенная программе?

2. Что будет с данными в многопользовательском приложении, если

периодически через VMMAP очищать Working Set?

3. Может ли периодическая очистка Working Set помочь в решении проблемы

"Out of memory"?

4. Что означают данные в столбцах Size, Committed и Private? (просьба

объяснить человеческим понятным языком)

ПС: причина, побудившая меня задать эти вопросы, состоит в том, что на

просторах инетва я не нашел внятных ответов на них. А на некоторые вообще

ответы отсутствуют. Потому и спрашиваю тех, кто этим пользуется в работе.

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harisma Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 February 2012 Location: Ukraine Status: Offline Points: 4	Post Options Post Reply Quote harisma Report Post Thanks(0) Quote Reply Topic: VMMAP. How to... Posted: 11 February 2012 at 4:05pm
	Прошу тех, кто с ней плотно и регулярно работает, дать мне ответ на такие вопросы: 1. В верхней части VMMAP есть 3 линейки: Committed, Private Bytes и Working Set. Что каждая из них обозначает и на которую их этих линеек в первую очередь стоит обращать внимание, при попытке определить, чем и на сколько занята виртуальная память, выделенная программе? 2. Что будет с данными в многопользовательском приложении, если периодически через VMMAP очищать Working Set? 3. Может ли периодическая очистка Working Set помочь в решении проблемы "Out of memory"? 4. Что означают данные в столбцах Size, Committed и Private? (просьба объяснить человеческим понятным языком) ПС: причина, побудившая меня задать эти вопросы, состоит в том, что на просторах инетва я не нашел внятных ответов на них. А на некоторые вообще ответы отсутствуют. Потому и спрашиваю тех, кто этим пользуется в работе.

MagicAndre1981 Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 08 January 2007 Location: Germany Status: Offline Points: 1456	Post Options Post Reply Quote MagicAndre1981 Report Post Thanks(0) Quote Reply Posted: 11 February 2012 at 9:21pm
	Please ask the question again in English!

harisma Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 February 2012 Location: Ukraine Status: Offline Points: 4	Post Options Post Reply Quote harisma Report Post Thanks(0) Quote Reply Posted: 13 February 2012 at 8:06am
	I ask those who with it regularly works to give me the answer to such questions: 1. In the top part VMMAP there are 3 rulers: Committed, Private Bytes and Working Set. What each of them designates and on which they of these rulers first of all should be paid attention, at attempt to determine, than and on virtual memory allocated to the program how many is engaged? 2. What will be with the data in the multiuser application, if periodically through VMMAP to clear Working Set? 3. Can periodic clearing Working Set help with the decision of a problem "Out of memory"? 4. What mean the data in columns Size, Committed and Private? (request to explain by human clear language) PS: the reason which has induced me to set these questions, is, that on internet resources I have not found the good answers on them. And on some in general answers are absent. Therefore I ask those who uses it in work. Thanks.

Dax1792 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 March 2011 Status: Offline Points: 404	Post Options Post Reply Quote Dax1792 Report Post Thanks(1) Quote Reply Posted: 13 February 2012 at 4:51pm
	It is still not easy to understand. The answers to most of your questions are in the VMMAP help. 1. For eample, Commit Summary Graph This graph shows the committed (memory that represents data or code) memory usage of the process by type. The graph's scale is the total committed virtual memory usage of the process. Private Summary Graph This graph shows the committed private virtual memory. This memory is backed by the paging file and charged against the system commit limit. It corresponds to the PrivateBytes performance counter. Working Set Summary Graph This graph shows the working set usage of the process by memory type. Working set represents the amount of commited virtual memory that's in physical memory and owned by the process. The graph's scale is the total committed virtual memory. Working Set is the amount of physical memory used by the process. Committed memory is the virtual memory that is represented by physical memory or pagefile for the process. Private bytes is virtual memory that cannot be shared with other processes. 2. The 'Empty Working Set' command in VMMAP releases the physical memory used by the process. The data will either be paged out or the pages will be reclaimed from the standby list if the application references them first. 3. No. Working set is physical memory. Out of memory happens when the sum of committed memory for all processes is greater than the commit limit. The commit limit is the sum of physical memory + the size of the pagefiles. 4. Size is the virtual memory that the process has reserved. The memory is committed when it is used for something. Private is virtual memory which cannot be shared by other processes. You can find out more in these articles. Mysteries of Memory Management Revealed,with Mark Russinovich (Part 1 of 2) \| Tech·Ed North America 2011 \| Channel 9 Mysteries of Memory Management Revealed,with Mark Russinovich (Part 2 of 2) \| Tech·Ed North America 2011 \| Channel 9 http://blogs.technet.com/b/markrussinovich/archive/2008/11/17/3155406.aspx You need to find a Russian speaker to help you.

harisma Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 February 2012 Location: Ukraine Status: Offline Points: 4	Post Options Post Reply Quote harisma Report Post Thanks(0) Quote Reply Posted: 14 February 2012 at 7:46am
	Thanks a lot for your help for my. "Russian speakers" on russian forums can't help me, because my similar questions already half-week does not any answer

Dax1792 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 March 2011 Status: Offline Points: 404	Post Options Post Reply Quote Dax1792 Report Post Thanks(0) Quote Reply Posted: 14 February 2012 at 12:17pm
	Unfortunately, it's 45 years since I learnt Russian.

Carlo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 October 2010 Status: Offline Points: 15	Post Options Post Reply Quote Carlo Report Post Thanks(0) Quote Reply Posted: 09 March 2012 at 3:21pm
	HI, I watched at Mark's videos and a question arise... Slide 20 in WCL406 states that system commit charge include "Read/write file pages". Question is: which file type Mark refers to ? As far as I understand memory-mapped file pages are backup by the file itself on the disk.. Thanks in advance....

LMiller7 Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 27 May 2011 Status: Offline Points: 85	Post Options Post Reply Quote LMiller7 Report Post Thanks(0) Quote Reply Posted: 09 March 2012 at 5:38pm
	Any file type could be used as a memory mapped file. Normally memory mapped files are backed by the file itself. But it is also possible to create a file mapping object that does not refer to a file at all. This could be used for such things as sharing data between processes. In this case it would be backed by the pagefile.

Carlo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 October 2010 Status: Offline Points: 15	Post Options Post Reply Quote Carlo Report Post Thanks(0) Quote Reply Posted: 09 March 2012 at 10:24pm
	right, this is ok....but the question is related to VMMAP view of a process running an executable image For instance, as you can see in attach, the detail for notepad.exe image show a committed region of 32K (Read/Execute) for .text section Now, from my understanding, .text section contain executable code (no writable attribute) so it would be backed by the image file itself... Why VMMAP show this region as committed ? Note: From VMMAP help Committed: The amount of the allocation backed by system virtual memory (RAM and paging files) and charged against the system commit limit) VMMAP-notepad.zip

Carlo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 October 2010 Status: Offline Points: 15	Post Options Post Reply Quote Carlo Report Post Thanks(0) Quote Reply Posted: 13 March 2012 at 4:37pm
	Maybe it could be a misunderstanding in VMMAP help....the column "committed" could mean all committed memory (backed either by RAM+pagefile or "normal" file (image/data) on the disk) ? Any help is appreciated, thanks