Paging question.

Hello Gurus,
We have a Production 2-node RAC system, recently there have been couple crashed. Oracle says that low memory fragmentation is the reason for that. I ran statspack report for the time period just before the crash, from that i found following ...
Virtual Memory Paging
~~~~~~~~~~~~~~~~~~~~~
KB paged out per sec: 404.9
KB paged in per sec: 2,396.9
I know that high Page is some thing positive, but not sure whether to start trouble shotting this ... please advice.
Thank you,
Aditya

To solve a problem you need to know WHAT the problem is. So just what is causing that paging? One or more processes are placing demands on memory that requires the o/s to heavily start swapping memory pages in and out of memory. Why?
Is this because the SGA is too large to be effectively kept in memory? Is it because of a single Oracle server process running a PL/SQL procedure that abuses memory by attempting to bulk collect a million rows with a single bulk fetch? Is it the Quake Multiplayer server running secretly on the server? ;-)
As always - solving a problem needs to have an accurate problem description. Paging is a symptom. Not the problem. You now need to find out what the problem is.

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Smart paging Question , What happen if i don't enable smart paging and available Memory is about 1GB and the VM need 3GB for Booting ?

Hi ,
I configure a dynamic memory With 512 MB for a VM , and available memory 1GB
what happen when I boot the VM , While it actually need 3GB for booting - Note I don't configure Smart Paging ?
Thanks.

You won't be able to boot at all.
pagefile and dynamic memory only comes into play when you don't have enough memory on the host, to support the 'startup RAM' on the VM, and when the VM does a
reboot.
-kn
Kristian (Virtualization and some coffee: http://kristiannese.blogspot.com )

Recordset paging question

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Test the recordset paging value in the querystring. If it's above the range of the first page, branch around the code you don't want to execute. Include a sample of your page code if you need more specific details.

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Importing class or jsp:useBean option

Hi,
I am bit confused as when to use between "beanClasses" or "tag librery" or "simple java classes useing import". as far as i feel all are capable of doing almost each others task (i.e excuting a method to process something). can anyone help me in understanding this

Well, first, if I understand correctly,
"simple java classes useing import"Would be using scriptlets to do the job. It is always best to avoid scriptlets, and the best way to do that is to
use javabeans. So I would say use "beanClasses" over "simple java classes useing import" whenever humanly possible.
On the other hand, I use tags and beans for different reasons. I use beans to transport data from one spot to another, such as through pages and requests, or to access non-display logic, like getting data from a database. I use tags mainly for complex display operations.
For instance, lets use the oft-asked Paging question. I have a database with 500 records. I want to display 20 at a time in a JSP. I would use a Bean to get the information (and store it in a List of another Bean type). Then I would use a tag to do the [prev] 1 2 3 4 5 6 7 8 9 10 ... [next] display and links.
Hi,
I am bit confused as when to use between
"beanClasses" or "tag librery" or . as far as i feel all are
capable of doing almost each others task (i.e
excuting a method to process something). can anyone
help me in understanding this

[EWS][FastTransfer][MS-OXCFXICS] Question about paging in the Fast Transfer Stream after exporting message and the meaning of the config in the previous section of the stream.

Hi, all.
First, I want to construct a fast transfer stream by programming not using the export item's stream and to import the stream to the folder by posting import request in EWS.
So, I export the item by EWS and investigate the exporting stream's struct by reading the [MS-OXCFXICS].pdf. And I can parse each MAPI property, marker, meta-property from the stream.
I find that the stream is made of many pages, most page's length is 0x7BC0, some are less then 0x7BC0. And in the previous section of the stream, there are some configurations. So the questions are:
1. What is the paging rule? or What is the principle of the paging? Whether a complete propvalue/marker(ref from [MS-OXCFXICS].pdf) must be contained in a page except some binary type?
2. Why the page's binary length is 0x7BC0? Or where is the configuation about paging length?
3. The stream is made of the FXOpcodes and the subbuffer about the FXOpcodes, and I find the mean of the FXOpcodes:
internal enum FxOpcodes
None = 0,
Config = 1,
TransferBuffer = 2,
IsInterfaceOk = 3,
TellPartnerVersion = 4,
StartMdbEventsImport = 11,
FinishMdbEventsImport = 12,
AddMdbEvents = 13,
SetWatermarks = 14,
SetReceiveFolder = 15,
SetPerUser = 0x10,
SetProps = 0x11
and in the stream there are 4 part(after I parse the stream):
A. OpCode:Config, value:0000000001000000
B. OpCode:IsInterfaceOk, value:010000000703020000000000C00000000000004600240080
C. OpCode:TellPartnerVersion, value:000F91838417
D and follows is: OpCode:TransferBuffer, Count:31680
So
a. What is the OpCode:Config value meaning?
b. Some parts of The OpCode:IsInterfaceOk' value is the IID_IMessage("00020307-0000-0000-C000-000000000046"), What is other parts meaning?
Thanks in advance for any ideas.

Hi Haiyang,
Your questions are not covered by the Open Specification documentation and this is documented in [MS-OXWSBTRF] — v20141018 section “1.3 Overview”.
The upload and export data stream is an opaque format that only needs to be understood by a server implementation. The client only serves as a repository for the opaque data stream so that it can be uploaded to the server at
a later time.
You made good progress in interpreting the buffer using other documents. Why do you need to be able to parse the data? Please describe your project in details and I might submit a suggestion to document the layout of the data stream,
if your project justifies it. You can send the description directly to me.
Thanks, Vilmos

[EWS][FastTransfer] Question about paging in the Fast Transfer Stream after exporting message and the meaning of the config in the previous section of the stream.

Hi, all.
First, I want to construct a fast transfer stream by programming not using the export item's stream and to import the stream to the folder by posting import request in EWS.
So, I export the item by EWS and investigate the exporting stream's struct by reading the [MS-OXCFXICS].pdf. And I can parse each MAPI property, marker, meta-property from the stream.
I find that the stream is made of many pages, most page's length is 0x7BC0, some are less then 0x7BC0. And in the previous section of the stream, there are some configurations. So the questions are:
1. What is the paging rule? or What is the principle of the paging? Whether a complete propvalue/marker(ref from [MS-OXCFXICS].pdf) must be contained in a page except some binary type?
2. Why the page's binary length is 0x7BC0? Or where is the configuation about paging length?
3. The stream is made of the FXOpcodes and the subbuffer about the FXOpcodes, and I find the mean of the FXOpcodes:
internal enum FxOpcodes
None = 0,
Config = 1,
TransferBuffer = 2,
IsInterfaceOk = 3,
TellPartnerVersion = 4,
StartMdbEventsImport = 11,
FinishMdbEventsImport = 12,
AddMdbEvents = 13,
SetWatermarks = 14,
SetReceiveFolder = 15,
SetPerUser = 0x10,
SetProps = 0x11
and in the stream there are 4 part(after I parse the stream):
A. OpCode:Config, value:0000000001000000
B. OpCode:IsInterfaceOk, value:010000000703020000000000C00000000000004600240080
C. OpCode:TellPartnerVersion, value:000F91838417
D and follows is: OpCode:TransferBuffer, Count:31680
So
a. What is the OpCode:Config value meaning?
b. Some parts of The OpCode:IsInterfaceOk' value is the IID_IMessage("00020307-0000-0000-C000-000000000046"), What is other parts meaning?
Thanks in advance for any ideas.

OK. Thank you.
Today I build a stream with a paging rule as below:
1. Keep each page's byte length is 31680.
2. Make sure a complete property value in a page except binary type property whose value length is larger
than 31680.
And it can work very well when import the stream to the folder by EWS.

Paging space and SQL question

Can someone tell me why a SQL statement , ie.
select count(*) from some_table;
Would take up excessive paging space on my server.

thank you for your help rago, but I am afraid I am
more confused from your response.
is important investigate on the minfree/maxfree,
is the amount of the RAM dedicated at procs/file ,on unix
What do you mean here?contact your sysadmin,
this parameter, OS, indicate the amount of the RAM
to dedicate at proc and/or at files !
similar parameter
pghead
minperc/maxperc ...
investigate on the
pagefault/syscall/swap area/pagin/pagout/. . .
top
topas
admintool, ?,
vmtune
>
And are you suggesting I increase my Shared pool to
375MB ?this the limit suggest to increase the sga on your system,
if the system have 1500 MB of RAM ,
then max amount suggest for allocate the SGA is 75%,
1500 * 0.75 = 1125 for the 3 instance, on the machine !
1125 / 3 = 375 MB of RAM suggest to allocate.
I feel like , and my database is showing symptons of
the shared pool using paging space - so indicating
the shared pool is more than the available RAM.the question is:
1- if you have sufficient SGA, 1125 MB
but the OS dedicate to processes only
its 20% of the RAM -> 300 MB of RAM
the remaining is swap, that increase dayly !
2- if you have insufficient sga, the sga
swap continuously , with high page fault.
rago pasquale

Range Paging rownum question

I am using JDeveloper 11.1.1.3.0 and I have a question about the range paging access mode and I went through some docs but couldn't get myself to answer all the questions I have.
1. In the VO's I set the Access Mode to Range Paging and set the Range Size to 25 but I only have (at this time) 19 rows. But in the logs, I notice:
"<OracleSQLBuilderImpl><bindRangePagingParams> [2540] setting rownum query between (0, 28)"
which doesn't make sense. Firstly, 0-28 is not a 25 row range and secondly, why is the SQL even accessing anything outside the range of 25 when there are only 19 rows for the VO?
2. Also, I have two buttons on the page (page fragment #1) which performs operations (add a new row, version an existing row) by having the user go to a different page fragment (page fragment #2). After the user submits the info and returns to the original page (page fragment #1), I see this message in a pop-up:
"Cannot navigate with unposted rows in a RangePaging RowSet"
which, although not an error, doesn't make sense because the info was saved in the DB.
Hope my questions make sense.

I don't have the url reference handy for the "official" word, but I recall that jdev overfetches 3 records in range paging mode.
It's not known that there are only 19 records until the first batch is fetched, which is why you see 0-28.
Just noticed the second question - no comment on that one, unfortunately ;)
John

ML Ram, VRAM paging and allocation questions.

Question 1: I have been dealing with ram issues since I got my 2012 13 MacBook air since I put mountain lion on it. I benched the machine for awhile because of it and used my 2011 MBP since it has 16gb of ram but it recently gave up the ghost so im back on the air. I did all the updates it needed since being benched and for my light duty work it’s always good but as soon as I have more then 2 or 3 apps open at the same time or 6 or 7 safari tab it really goes to crap. After a cold boot with nothing running the OS is using 1.4-1.6gb ram to idle the older MBP used 1gb or less after a cold boot. I have gone to the trouble of doing a complete reinstall and not using any extra apps other then iLife and iWork and that hasn’t helped. The wired ram sits right at a gig and the active ram right around 4-5 hundred mb. I have added up all the running processes and factored in a 10% increase over that number just in case and added in the video ram(which with 4gb of system ram I thought was supposed to be 384mb but its actually 512mb, which is another topics ill be asking about) at 512mb the totally ram usage is only 918mb. I asked this once before and didn’t get any help so ill ask again, is this ram usage normal for this kind of machine or is there something wrong? The apple store says there isn’t anything wrong but there has to either be something wrong or the OS has hidden processes that cant be seen in activity monitor?
Question 2: did one of the updates increase the video ram allocation and is the video ram automatically and always paged or does the OS and graphics processor (HD4k) page VRAM only as needed?
If the graphics processor doenst always page all the video ram and does it dynamically then I have an even bigger problem and more ram being used and not accounted for.

Your issue almost certainly has nothing to do with RAM. Right now I am running Photoshop, FileMaker Pro, Word, iTunes, Mail, I have 8 tabs open in Safari, and about little utilities running. It is a 2011 MBA with 4GB of RAM and it feels no slower now than it did when I rebooted it yesterday after installing an update.
Obsessing over the Activity Monitor's report of RAM usage will get you nowhere - there's only one number in the entire dialog box that has any real importance to us: Page Outs - which indicate how much data has had to be swapped from RAM to hard drive, which, of course means you are trying to use more RAM than the computer actually has.
I suggest that you take a close look at what processes are running and the CPU usage of each. You may have a rogue process that is bogging the computer down. Another two prime suspects would be Internet plug-ins and Safari extensions.
One of my most important troubleshooting tools is a test account in which I've installed no software or performed any configurations. When my computer acts up I boot into that account to see if the problem follows me there. If it does not, I know the problem exists in my library.

XSQL Paging Example Questions - XMLBOOK

Hi all,
I run example NewsCategorySimple.xsql?p=2&id=1 from XMLBOOK (S.Muench pag. 650), but it doesn't show stateless paging. shows data, but not: Page 1 of 4 Next - Total 19.
I run over WNT4/Sp5, Ora816/R2, WEBDB/IAS, XSQL Utility (Examples is good), I don't have jdev 3.1 (is necesary?), my evironment variable CLASSPATH is add c:\xmlbook\samples\ch17\classes;....
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I think what configure Jserv (jserv.conf or jserv.properties) is the problem. can anybody help me
Thanks..

thanks, Steve
now is ok, but i have an other problem, in the URL: http://ias/orxmlapp/Examples/ch17/
I see the main page (index.html) and the message:
"No stocks selected" and "You have not selected any news categories... Preferences for roy-ayala". (XMLBOOK pag. 684, Fig. 17-23)
I added: wrapper.classpath=C:\xmlbook\samples\ch17\classes
wrapper.classpath=C:\xmlbook\samples\ch06\classes
in jserv.properties.
and run all script in ch06 / ch17
what do you think
[email protected]
null

Paged LDAP Search Results Question

Greetings,
I have some code that does a dbms_ldap.search_s to create a view of all users. Everything was working fine until last week when got an error and I realized the results return exceeded the LDAPS MaxPageSizeLimit (was set to 2000, we now have 2000+ users). I was able to get the sys admins to increase the size temporarily until I can modify my code to page the search results. I've been doing some research on Page LDAP Search Results and am not finding much for dbms_ldap. Perhaps my research skills are not up to snuff. In any case, I found on oracle docs (http://docs.oracle.com/cd/E17904_01/oid.1111/e10186/ext_ldap.htm#CEGJJIAF) where it references:
"As of Oracle Internet Directory 10g (10.1.4.0.1), you can obtain paged results from an LDAP search, as described by IETF RFC 2696. You request sorted results by passing a control of type 1.2.840.113556.1.4.319 to the search function. Details are described in RFC 2696."
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Can anyone point me somewhere that I can found how to implement returning pagedResults using ldap with Oracle 11g?
Best,
Nat
Edited by: 899806 on Jan 10, 2012 10:23 AM

Yes, I did read that but I don't see in that file where it references anything about dbms. I see the section on:
RFC 2696 LDAP Control Ext. for Simple Paged Results September 1999
pagedResultsControl ::= SEQUENCE {
controlType 1.2.840.113556.1.4.319,
criticality BOOLEAN DEFAULT FALSE,
controlValue searchControlValue
However, when I look at oracle docs, I don't see where in dbms_ldap you can specify this config. any pointers?

Blazeds Paging support question

Hi,
I've read an article explaining how simple paging can be implemented in a Data Grid using Flash Builder 4. FB4 generates a lot of code and when I started to take a look at the details, I found that it's using classes specific to LiveCycleDS (ManagedQuery, RPCDataManager etc.). The confusing part is that the guide chooses BlazeDS as the remote access service. However, I've also read from a few sources that data paging is only available in LiveCycleDS.
In an enterprise Flex app, does anyone know if I must purchase LiveCycleDS to have paging in a Data Grid as shown in the article?
The article above was mentioning: "Yet another source of confusion – LiveCycle DS Express is exactly the same as LiveCycle DS except that it is FREE and restricted to a single application running on a single CPU (click here for more details on the licensing)."
So does that mean the data paging article only works for a small scale app and not for an enterprise app - unless I purchase LiveCycleDS?
Thanks.

Hi,
I understand your confusion, but hopefully this helps
Paging was a feature only available to LiveCycle Data Services (LC DS) until Nov 2009. Since then, we have moved some of the data management library (fds.swc), which was only available to LC DS customers, in Flash Builder. This was done in Flash Builder 4.0. This change allows anyone who has purchased Flash Builder 4.0 to use the paging feature as demonstrated in http://blog.everythingflex.com/2009/11/03/data-paging-within-flash-builder-4/ without having to buy a license of LC DS.So, yes, you can use this with BlazeDS.
Greg's post is quite old and reflects information before we made this change and has not been updated. However, LC DS continues to offer sophisticated data paging if that is something you are interested in.
Finally LiveCycle Data Services Express - We also used to call it LiveCycle Data Services 1-CPU. This option allowed developers to use LC DS in production as long as they limited it to a single application running on a machine with 1CPU. This option was discontinued last Nov (2009) with the release of LC DS 3.0.
Hope this l clears the confusion
Anil Channappa
Sr. Product Manager, BlazeDS and LiveCycle Data Services

Question regarding ScrollView and pageControl with multiple XIBs

Hi,
I am very new to iPhone programmming and OO type programming in general so please forgive me for my basic questions.
I am trying to set a paging scrollview up with each page being loaded from a different XIB and put into a view controller. This viewcontroller is attached to a scrollview that's put on a "Detail" view. I have this working OK with blank XIB pages.
My question is, when I start adding fields/buttons to the different XIBs how should I then process the actions etc. Do I create a seperate .h and .m file for each XIB and add the individual screen processing into the individual classes or do I use a single class (the "Detail" screen) and do all the processing in that class?, is that even possible?
I do hope that this makes sense. I'm still going through the basic learning books and I'm maybe trying to run before I can walk.
Any help is most appreciated.
Thanks

Hi Ziximo, and welcome to the Dev Forums!
Ziximo wrote:
I am very new to iPhone programmming and OO type programming in general so please forgive me for my basic questions.
No forgiveness is necessary. You came to the right place.
I am trying to set a paging scrollview up with each page being loaded from a different XIB and put into a view controller. This viewcontroller is attached to a scrollview that's put on a "Detail" view. I have this working OK with blank XIB pages.
In case it's useful to you, here's a thread which shows how to use the PageControl sample app as the template for what you're doing: [Re: Flipping through views help|http://discussions.apple.com/thread.jspa?messageID=10417960&#10417960].
My question is, when I start adding fields/buttons to the different XIBs how should I then process the actions etc.
The advice you have from thomas-r is right on target, so I'll just try to add to that. Firstly, I think you may be making a diligent attempt at "top-down" design, which is commendable. However there's a dirty little secret that working programmers don't share with managers: Quite often we don't produce the functional specification until we get the code working.
In other words, thomas-r's reference to Murphy isn't an insult. That's just how software gets designed.
In general, the decision to make a new class should be based on encapsulation and re-usability. For example when you get a memory warning, you might want to release all of the resources required for a screen that isn't currently visible. If that screen and its controller can be fully regenerated from one nib, this can be an easy task.
As another example, say the top-level controller is an instance of your ScrollViewController class. If you limit that controller to managing the scroll view and page control, you'll probably have a class you can reuse the next time you need a paging scroll view. But if you pack the functionality for multiple content views into that same controller, the class will only be useful for an identical app.
.. or do I use a single class (the "Detail" screen) and do all the processing in that class?, is that even possible?
So, no, I would definitely not attempt to put all the control in one class. Yes, it's possible, but besides being bad practice, it's awkward to implement. For example, when you make a nib which is owned by a view controller, it's easy to connect that controller's outlets and action methods to controls which are defined in that nib. There are ways to connect controls to an object defined in another nib, but it's much more difficult. It's not a "natural" configuration, and that by itself should give us second thoughts about our design. On the other hand, if we make one giant nib which is owned by the top-level controller, memory management goes out the window. We would need to unload everything in that nib to gracefully handle a memory warning.
Do I create a seperate .h and .m file for each XIB and add the individual screen processing into the individual classes ...
Yes. This gives us the reusability and encapsulation we want. The only remaining question is: "Do I need a separate controller class with it's own custom xib for each screen?". Well you may not. There could be two or more screens that are so similar (e.g. the same layout and functionality but with a different image) they can each use an instance of the same controller class and share the same xib.
I usually start with a different controller class and a different xib for each screen. Then, near the end of the project, I'll look at all those controllers and see if two or more are nearly identical. If so, I might get rid of one or more classes, and possibly one or more xibs as well. But I'd almost never assume I can merge two controller classes at the outset. If I did that, I might start adding kludges to the merged class as I found differences between the screens I hadn't seen earlier. When the merged class finally got too complex for anyone to maintain, the job of splitting it up might be nasty.
I do hope that this makes sense.
I think that's my line.
I'm still going through the basic learning books and I'm maybe trying to run before I can walk.
If you've suceeded in getting the skeleton working--i.e. you're paging through blank screens, each with it's own vanilla controller/xib, without any bugs, I'd say you're more than ready for the question you're asking here. And it's a very good question.
\- Ray

Memory problems (/questions/967643)

Some basics
Firefox 30
Windows XP SP3
Technical level
I am a software developer but have no experience building or debugging firefox or any of the other mozilla products. I am willing to provide debug information as needed. I also have a background in QA and testing so I am not afraid to roll up my sleeves and help iron out some of these issues if given some guidance on how to proceed.
Troubleshooting Information:
I have the Troubleshooter installed but don't see the data.
I also can't see the educated guesses about the current browser and operating system when I click the "See the data" and "Show details" links. I generally browse always in private mode. I have attached a list of addons at the bottom just in case.
Firefox seems to leak both memory and virtual memory during routine web surfing. By Routine, I am doing the following:
1. Opening Gmail and reading all my mail. After I am done, I close the tab. I probably go through 100-200 emails at a time.
2. Go to Google News and read some stories. I will share some of them using the Buffer This Page addon. I will close the tab when I am done.
3. Go to Slashdot and read all the days stories. I will close the tab when I am done.
4. Maybe go to facebook or twitter and catch up on some updates. I will close the tab when I am done.
After that, depending on how long I leave firefox open with no activity, it will just continue to use the same amount of physical and virtual memory as it was using at peak. It is almost like it keeps requesting resources and never frees them until I completely close firefox and sometimes kill the firefox.exe process in Windows Task Manager.
As a point of reference, after doing the above tasks and trying to research this issue by checking about:addons-memory (which currently shows about 100 MB of known memory usage) as well as researching this support site, I am up to almost 600 MB. Some days, it will exhaust all my systems physical and virtual memory until it starts paging. As a result, I keep firefox closed as soon as I am done using it. I use other apps to check email and only use firefox for very short periods of time.
The following are the current addons I see installed and enabled:
about:addons-memory 8
ActiveInbox for Gmail and Google Apps 5.0.12
Adblock Plus 2.6.3
Bitdefender QuickScan 0.9.9.119
Buffer for Firefox 2.6.0
DoNotTrackMe: Online Privacy Protection 3.2.1113
DownThemAll! 2.0.17
DownThemAll! AntiContainer 1.3
HTTPS-Everywhere 3.5.3
IE Tab 2(FF 3.6+) 5.12.12.1
Launchy 4.4.0
Linky 3.0.0
Neo Diggler 1.0.6
NoScript 2.6.8.33
Rapportive 1.4.0.1
Troubleshooter 1.1a
YouTube Video and Audio Downloader 0.3.6.2
The folloiwng are disabled:
Privacy Badger Firefox 0.1.4
ThinkVantage Password Manager 2.0

I admire you for being willing to get your hands dirty, I will pull out the profiler and memory bug instructions:
*this will tell you more about the about:memory page: [https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIMemoryReporter]
*Memory leak tools [https://wiki.mozilla.org/Performance:Leak_Tools](not sure how old that is)
*[https://wiki.mozilla.org/Platform/Memory_Reporting]
Also the Telementary data sent on the browsers can help improve the performance. There are also automated tests done to check performance of different platforms.
If you are interested in providing a website example this could help create a bug. With the websites you tested/mentioned in your description, there are have these tools to test the performance of the profile as well: This will test the javascript engine on desktop: [https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Reporting_a_Performance_Problem]
There is also DTrace that can help optimize development on javascript pages [https://wiki.mozilla.org/Performance/Optimizing_JavaScript_with_DTrace#Tips]
I understand that add on memory is assumed to only measure: " about 100 MB of known memory usage) as well as researching this support site, I am up to almost 600 MB" - Another troubleshooting step for running Firefox without addons is Safe Mode, does the memory stay high without them as well?
The troubleshooting info will be in the link in the right column of this question's page. "More System Details" is the title.
What is the webGlRenderer message? "TrynewDriver"
Also I invite you to get involved in QA if you have some free time. The contacts page for Firefox Desktop is: [https://wiki.mozilla.org/QA/Desktop_Firefox/GetInvolved Desktop_Firefox Get involved] :-)

Paging question.

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