OsX 10.5.1 Virtual memory management

Is there any way to control which disk OsX uses for swap?
I have a ridiculously small Raptor that I would like to use as this is about all it's good for, but I can't see any way to control this.

Here a link to a solution at MacOSXHints-
http://www.macosxhints.com/article.php?story=20071121070305908

Similar Messages

Advance virtual memory management tool?

Hello, is there a way to specify which hard drive to use first and in which order for the virtual memory? Like I added some SSDs + HDDs + PCIe ssd but I would like the PCIe SSD to be used first (if it is the fastest) and then the SSDs and ultimately
the slowest HHDs.
Also if I build a RAID 0 of SSDs I guess it should measure the MB/s and use the fastest first and slowest last. Of course using the PCIe in // with RAID ssds can be great as long as the performance improve.
If such a tool doesn't already exist that will be a great one.
Note: I need a huge amount of virtual memory for few months, I have 64GB ram but buying 1TB will be way too expensive.
Thanks for your help
w
w.

Hi w.
If you don’t want Windows to automatically manage the page file, we have the following options:
You can move the page file to a different volume if you have more than one volume.
If you have more than one volume, you can establish more than one page file.
For any page file, you can choose between System Managed Size and Custom Size.
If you choose Custom Size, you can specify an initial size and a maximum size.
You can remove a paging file from a volume by selecting the volume and choosing No Paging File. (In fact, you can do this to get rid of all paging files, although doing so is not recommended, even on systems with a lot of RAM.)
Because your disk controller can process multiple requests to read or write data concurrently, we should let Windows choose which page file it feels are appropriate.
All we need to do is moving the page file to a fast drive that doesn’t contain your Windows system files if you have more than one physical disk. Using multiple page files split over two or more physical disks is an even better idea.
Regards,
D. Wu
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Advance Virtual Memory managment tool?

Hello, is there a way to specify which hard drive to use first and in which order for the virtual memory? Like I added some SSDs + HDDs + PCIe ssd but I would like the PCIe SSD to be used first (if it is the fastest) and then the SSDs and ultimately
the slowest HHDs.
Also if I build a RAID 0 of SSDs I guess it should measure the MB/s and use the fastest first and slowest last. Of course using the PCIe in // with RAID ssds can be great as long as the performance improve.
If such a tool doesn't already exist that will be a great one.
Note: I need a huge amount of virtual memory for few months, I have 64GB ram but buying 1TB will be way too expensive.
Thanks for your help
w
w.

Hi w.
If you don’t want Windows to automatically manage the page file, we have the following options:
You can move the page file to a different volume if you have more than one volume.
If you have more than one volume, you can establish more than one page file.
For any page file, you can choose between System Managed Size and Custom Size.
If you choose Custom Size, you can specify an initial size and a maximum size.
You can remove a paging file from a volume by selecting the volume and choosing No Paging File. (In fact, you can do this to get rid of all paging files, although doing so is not recommended, even on systems with a lot of RAM.)
Because your disk controller can process multiple requests to read or write data concurrently, we should let Windows choose which page file it feels are appropriate.
All we need to do is moving the page file to a fast drive that doesn’t contain your Windows system files if you have more than one physical disk. Using multiple page files split over two or more physical disks is an even better idea.
Regards,
D. Wu
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Why does my mac use virtual memory when I still have free physical memory?

I have a 2011 i7 quad core mac, I was hoping it would scream. Most of the time it does. However when trying to edit within FCPX I get a very disappointing experience with many pauses and pin wheels if I don't close every single other program.
I have 8GB of physical memory and when i'm experiencing these problems I see that i still have 1-2 gb of physical memory free or inactive. At the same time FCPX is only using 2gb of memory. I just happened to keep an eye on the VM page in/outs and noticed them going up.
Right now i'm doing some browsing and emailing, that's about it.. its sat with over 4gb of memory free or inactive and yet still the page in/outs is still going up occasionally. It's currently at over 2 million page ins, and over 1 million page outs.
So with so much physical memory free why is this happening!? At the moment the mac feels nice and responsive, but if i start trying to use FCPX i'll start to experience these slowdowns, stalls... whenever i see these i see my main hdd is being accessed whilst the pinwheel is displayed.. I mean i get it, its VM, the hdd is too full, a bit fragmented perhaps, its stalling... but i've got gigs of memory sitting free or inactive... why wont the OS use it!!!
Would my experience improve if i took the plunge and got 16gb of memory instead of 8gb!?
Thanks for your help!

Because without virtual memory, managing computer RAM is a royal pain in the ...
Virtual memory cost you nothing, and gains you huge benefits, even if you do not notice it
What cost you is when you need more real RAM than is available, and things are thown out of RAM, either back to the original file it came from (Read Only information), or pushed out to the swapfiles (/var/vm/*). Then the system has to wait for slower disk access. But even this is better than not being able to run the apps until you quit something else.
(speaking as someone that starting his professional life working with 1" punch paper tape, 80 columns cards, 7-track and 9-track mag tapes, 1MB disks (you heard me right 1 Megabyte), etc..., and trust me when I tell you that virtual memory is a god send to software development).
There are a lot of problems running a modern operating system with out virtual memory. For example all the shared libraries and frameworks that provide services to an application would all need to be compiled into the application, which means every application gets bigger and instead of having a single copy of the shared library or framework, you would have dozens of copies wasting your RAM.
Without virtual memory, you would be required to find a contiguous chunk of RAM to run your application. Think of this like going out to dinner by yourself, you can find any available table, but if you go to dinner with your extended family, you need a table for 10 to 15, and if you are going to dinner with your high school graduation class, you will need hundreds of seats all next to each other and a very large table. In the later situations you have to wait until the resturante has enough contiguous space, which means you have to wait until other diners finish. There may be lots of empty tables, but they are not together, and your group wants/needs to sit together. Virtual memory allows gathering any 4K chunk of RAM, building a virtual memory map for all those random 4K chunks, and make it look like one big contiguous chunk of RAM, so you can run your application right away, no waiting.
Going back to shared libraries and frameworks. This code will need to have addresses resolved so they branch to the correct locations during execution, and it will need to have addresses resolved on where its program variables are located in RAM. Using virtual memory, you can local a shared object into RAM, then place it in everyone's virtual memory map at the exact same RAM address. This means everyone can use the exact same code, and since everyone is using it at the same RAM address, it makes life so much easier for the operating system (translation, less work, less wasted CPU time, faster execution).
When a program wants to grow, for example a web browser loading a web page (and its images) into RAM, it needs to allocate additional RAM. In the contiguous RAM model, you need to get control of the RAM that imediately following your program, but if that RAM is being used by someone else, you have to wait until that program goes away.
Virtual memory provides protection from another program looking at and modifying your program's RAM. Malware would just love for virtual memory to go away.
You want virtual memory. What you do not want is excessive paging activity.
If you are concerned, then you can launch Applicaitons -> Utilities -> Terminal. Once you have a terminal command prompt, enter the following command:
sar -g 60 100
which will tell you the number of 4k pages written to /var/vm/pagefile ever minute for 100 minutes (modify the numbers to suit your tastes). You can then go about your normal usage, and come back later to see how much you have been using the pagefiles. If you have mostly zeros, and an occasional small burst, this is noise, and not worth worrying about. If you have sustained pageout activity, with higher numbers, then you should either consider running less things all at the same time, or looking for an application that is being greedy with its memory use (or has a memory leak), OR get more RAM for your Mac if you need to do all those things at once.
But do not complain about virtual memory. Life would be much worse without it. Then again if you have a better idea, write a research paper, and get operating system vendors (as well as hardware vendors) to implement your ideas. I am serious, as I've seen many accepted computing ideas be overturned by good new ideas.

OSX inactive memory management problems

On my 2010 Macbook Air 11" running OSX 10.8 Mountain Lion, I have run into some major issues with memory management. This problem persists across both my Mac machines and multiple generations of OSX. I have a 2007 2.2 Ghz Core 2 Duo Macbook Pro Running Lion (upgraded from Tiger) with 3 gb 667Mhz DDR2 RAM and my 2010 Air 1.4Ghz Core 2 Duo (Upgraded from Snow Leopard to Mountain Lion) with 2gb 1067mhz DDR3 RAM. On both machines, for some time now, during normal usage; especially web browsing using Chrome and Safari (respectively); the inactive RAM on both machines will grow to consume around 30% of all RAM and force time consuming page outs to the mass storage drives on both machines. The Pro has a slower hard drive and the problem is the worst here, the air has a much faster SSD. I have found myself constantly having a window of Activity Monitor up on at least one of my desktops watching my RAM usage, using terminal to purge ram upwards of 10 times an hour to prevent costly page outs, especially on the Pro. I know Apple claims that inactive RAM is essentially free RAM that is temporarily storing recently used information for ease of access later and that it's supposed to be released as free memory when needed, but this obviously is not happening. Right now on my air my swap file is over 650Mb and I've seen it top 2Gb before. The air is exponentially better than the Pro due to the faster SSD, but I do notice substantial UI lag and a massive drop in fluidity as soon as my meager 2Gb is full and I start paging. The Pro is another story entirely, the entire system will essentially become unusable, having to wait several seconds for mouse clicks to even register. That's why I upgraded the stock 2Gb of RAM it comes with to 3Gb hoping that a 150% increase in RAM would help, but it just prolonged the inevitable. I still end up paging out just as bad across both systems if un checked. Even when I keep a close eye on memory usage and purge often, I still end up paging out because I'm not vigilant enough.
I have to limit my browsing to less than 5 tabs and keep my number of open programs less than 2 on both machines. My active and wired memory rarely seem to top 70%, meaning the rest gets taken by inactive, which isn't functioning as Apple claims. Even if my conclusions aobut what is happening under the hood are incorrect, something is going terribly wrong. I can't upgrade the RAM on my Air at all, and the RAM on my Pro is capped at 4Gb. I'm holding on upgrading because I don't think the excess hardware will solve this software memory problem. Whatever is happening is causing a serious drop in performance for me (yes I do know I have underpowered machines), but there has to be something I can do to speed performance. I've read about disabling the dynamic page file entirely, which just seems to crash the system when free memory is gone, and I've read about programs that claim to free memory. Those programs seem to work by taking a high priority in the process heigharchy of the OS and then proceeding to eat up large portions of RAM and releasing them as needed in an attempt to replicate the true intentions of inactive RAM, but I've heard of problems with this method as well. Does anyone have a viable solution? Monitoring my RAM usage myself and ensuring I don't end up paging out is costly, time consuming, annoying, and inefficient since I fail to catch the problem before I page if I get particularly busy. There is no other OS I've ever been acquainted with that has this problem, not any flavor of Linux, not even the dreaded windows. I seriously hope Apple can do something to manage this runaway memory problem. I'd like to be able to open more than 3 windows in Safari. I've had to purge 3 seperate times while writing this on my Air, and I now have 678 inactive memory, 741 inactive, 582 wired, and less than 14Mb free out of 2Gb with a growing swap at 680Mb. Each purge becomes less and less effective and the last one I did freed up only about 100Mb and it got eaten up again by inactive in less than 10 seconds. On my Air, the memory hog is Safari right now at 700Mb between the web content and flash player with only Facebook, youtube, and this Apple Supprt tab open. I have NO other applications running in the fore or background other than Activity Monitor and Terminal. On my Pro the memory hog is always kernel task, I use Chrome and Safari both. While the memory used by the browser does not usually take up the most substantial portion of the total used RAM out of any process, the more tabs I open, the more RAM I use. The browser is usually the second heaviest RAM hog to Kernel Task. So it seems that across the two machines there are two lsightly different manifestations of the same problem with the same results: massive performance drops and extremely annoying and costly page outs no matter the reason. I just want this problem to go away. I've used underpowered windows laptops that can open a dozen tabs in a heavier browser like IE or Firefox while using other programs like Word or Excel and more with no memory lag issues. There's no way in **** I could manage to open that many pages in a browser while using Pages and/or Numbers on either of my machines and expect reliable (swap free performance). This is just kind of sad in my opinion. Does anyone have a way to get my OSX machine running smooth so that I can remove the one thing that windows and Linux fan boys get the right to laugh at my Macs for?

Hi Zephryl,
I was actually able to get an initial response from Sun on this a few months ago. However, the Sun Swing team has not followed up on a resolution for this pervasive problem, even though they noticed the same problem when running a test applet I had created for them. Apparently, I.E. is not releasing memory from the heap.
Below is a quote from a Sun rep. on this in an e-mail sent to me on Dec 4, 2002:
"I suspected the leak is in the native code because the # of handles and GDI objects keep increasing but no obvious Java objects are left behind in the Java heap during page switch."
So, until Sun and/or Microsoft work out a solution to this, anyone who uses I.E. 6 and applets for their UI seems to be in a lot of trouble.
As a note, trying to invoke the Garbage Collector does not do anything, but generally a very small amount of memory will be released (like maybe 5-10% of the memory allocated for the applet).
Cheers!
Avi Gray
Global Computer Enterprises

SQL Error Data Flow Task 1: The buffer manager detected that the system was low on virtual memory...

I'm relatively new to SQL and this is the error that appeared when I tried importing my data. Not sure how to deal with this. Help please. Thanks a lot!
Information 0x4004800c: Data Flow Task 1: The buffer manager detected that the system was low on virtual memory, but was unable to swap out any buffers. 14 buffers were considered and 14 were locked. Either not enough memory is available to the pipeline
because not enough is installed, other processes are using it, or too many buffers are locked.

Either reduce the amount of data e.g. by lowering the Data Flow Task records max per batch and buffer size
or install more RAM, or process on a more capable computer.
Arthur
MyBlog
Twitter

OSX Poor Memory Management.

Hi!
As a former windows user and developer I was happy with its memory management ( Windows 7).
Now I decided to change, and give Mac a chance... and the only thing I have to say.. Im felling as using the old versions of windows... My machine has 8GB of ram and using it for about 2 days running 1 VM (2 GB of ram) and internet browsing gives me 15MB of free memory and 2.5GB swap file!! The system is slow as ****... Btw page outs is about 25% of page ins.
What can I do to stop that ?
Do I have to keep my ( pseudo ) Unix system rebooting? Thats a shame!
Thanks!

Now I decided to change, and give Mac a chance... and the only thing I have to say.. Im felling as using the old versions of windows... My machine has 8GB of ram and using it for about 2 days running 1 VM (2 GB of ram)
Most virtual machines take the amount of memory you give them away from the Mac for the life of the virtual session. So now you are most likely down to 6GB of RAM.
and internet browsing gives me 15MB of free memory and 2.5GB swap file!! The system is slow as ****...
Since you do not indicate what kind of applications you are running (besides the 1 VM), it is difficult to guess what is consuming your memory. Some applications demand more memory than others, especially graphic/video related apps where there is a lot of data to process.
Also having 15MB of free can be considered a good thing, as the Mac is actually using all that memory you paid for. "Inactive" memory is also available to the OS. Its main difference from "Free" memory is that the operating system knows what is in the inactive memory and if the original owner asks for that memory back, the OS can give it to the original owner without requiring an expensive disk I/O.
Btw page outs is about 25% of page ins.
Since the operating system will page a program into memory, it is very typical that you will have more pageins than pageouts.
You can use tools such as
sar -g 60 100
to monitor your pageout activity once a minute for 100 minutes and see if you can correlate heavy pageout activity with the use of a specific application.
You can also use Applications -> Utilities -> Activity Monitor to monitor your programs. If you think you have found a heavy memory consumer, you can select that app, in Activity Monitor, then click on "Inspect", then "Statistics" and that will show you the paging activity.
You can also use Unix commands such as 'top' and 'ps' (see "man top" and "man ps"), as well as 'vm_stat', 'iostat', etc...
Another thing. A lot of people have reported slowness when it turned out their disk was getting lots of errors. This is unlikely, but it has been know to happen.

What is difference between 32 bit and 64 bit sql server memory management

What is difference between 32 bit and 64 bit sql server memory management
Thanks
Shashikala

This is the basic difference...check if helps:
A 32-bit CPU running 32-bit software (also known as the x86 platform) is so named because it is based on an architecture that can manipulate values that are up to 32 bits in length. This means that a 32-bit memory pointer can store a value between 0 and
4,294,967,295 to reference a memory address. This equates to a maximum addressable space of 4GB on 32-bit platforms
On the other hand 64-bit limit of 18,446,744,073,709,551,616, this number is so large that in memory/storage terminology it equates to 16 exabytes. You don’t come across that term very often, so to help understand the scale, here is the value converted to
more commonly used measurements: 16 exabytes = 16,777,216 petabytes (16 million PB)➤ 17,179,869,184 terabytes (17 billion TB)➤ 17,592,186,044,416 gigabytes (17 trillion GB)➤
As you can see, it is signiﬁcantly larger than the 4GB virtual address space usable in 32-bit systems; it’s so large in fact that any hardware capable of using it all is sadly restricted to the realm of science ﬁction. Because of this, processor manufacturers
decided to only implement a 44-bit address bus, which provides a virtual address space on 64-bit systems of 16TB. This was regarded as being more than enough address space for the foreseeable future and logically it’s split into an 8TB range for user mode
and 8TB for kernel mode. Each 64-bit process running on an x64 platform will be able to address up to 8TB of VAS.
Please click the Mark as answer button and vote as helpful if this reply solves your problem

When playing games on facebook, I often get the message "virtual memory too low, is being increased" Is there something I can do to clean out the "virtual memory" to avoid this?

As mentioned in my question above, it happens usually during playing games. I wondered if there were someway to clean out the virtual memory, as opposed to it "increasing" continually and overloading my memory in general. You are speaking with a computer novice for the most part, so I am unfamiliar with a lot. I do do updates and general maintenance on the computer, but is that enough for this issue?

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Update the [[Flash]] plugin to the latest version.
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Physical memory is the memory that is installed on your computer as real memory. To be able to run programs that require more memory and more programs at the same time (via time sharing and task switching) it is also possible to move (swap) currently not needed code and data to disk to make room for other programs and data. The total memory available for programs is the Virtual Memory.
You can check the Virtual Memory settings here: Control Panel > System > Advanced > Performance > Settings (Advanced tab)<br />
Windows can manage more memory then is physical available and that memory is stored in a page file on your hard drive.
If the size of that file is not large enough and all available memory is in use then you get the Virtual Memory is low warning.
Make sure that you have at least 1 GB or the recommended setting for the Virtual Memory.
If you have less than 1 GB physical memory installed on your computer then if possible add more memory.
http://support.microsoft.com/kb/555223 - RAM, Virtual Memory, Pagefile and all that stuff

High virtual memory after sleep with Mavericks

Here is a screenshot of activity monitor below, right after lifting the lid on my MacBook Air 2013 running Mavericks 10.9.2 (upgraded from Mountain Lion).
It's in french but you can see that the virtual memory is running higher than I would expect (IMO). There is no slowdown of the OS, no beach balls, no memory pressure, ever.
This does NOT happen on my Macbook Pro 2012 (standard 13", no SSD) in identical conditions under the same OS version.
Here what i do in more detail. I run several apps at once:
- MS Word (3 ou 4 docs)
- Pages (1 or 2 docs)
- Preview (1 or 2 medium or large PDFs)
- Mail
- iTunes
- Safari (no more than 5 or 6 tabs at once)
- Messages
- A spell checker (Antidote. Yes, a french one)
- Zotero
- Activity monitor
RAM used is never above 6 Gb, and some it is usually cache anyway.
At the end of the day I close the lid to put the MBAir to sleep. The next day I see this high (or is it really that high??) virtual memory usage, with swap used anywhere from 300 to 900 Mb.
Computer runs smoothly, no hang ups, everything is seamless!
Is this normal operating behavior for a Macbook Air??
I know Mavericks introduced new RAM management, but should I just stop looking at Activity Monitor like I have OCD (I dont. I think.) or should I call Apple? Or do a clean install?
Suggestions welcome! If I'm missing info please advise. If a thread already exists about this I didn't find it...

You are not alone in being baffled and worried about the memory readings in the Activity Monitor. There are many postings on this. Mavericks uses memory quite differently than previous OS X versions and so the numeric memory usage readings no longer mean what they used to. The best indicator now is the Memory Pressure graph, which on yours is low and green (good).
Computer runs smoothly, no hang ups, everything is seamless!
Yep. Mavericks runs great. There is nothing you need to change or be worried about, espeically with 8 GB of RAM.
should I just stop looking at Activity Monitor like I have OCD
Yes, unless you want to watch the green Memory Pressure graph but that would be booring.

How to change Virtual Memory in Windows 7 with SSD and 16GB RAM

I have SSD Samsung 850Pro with OS Windows 7 and have installed physical RAM 16GB.
In Adobe Help/Optimize performance/Photoshop written :
" To change Virtual Memory in Windows 7 and Vista, quit all applications and then do the following:
Choose Start > Control Panel, and double-click System.
Choose Advanced System Settings in the Tasks list.
Select the Advanced tab and click Settings in the Performance section.
Select the Advanced tab and click Change.
Deselect Automatically Manage Paging File Size For All Drives.
Click each hard disk letter to show the available space on that drive. Select a hard drive that has three times the amount of your computer’s installed RAM and doesn’t contain a scratch disk.
Select Custom Size, and type the amount of your physical RAM plus 300 MB in the Initial Size box. Type three times the amount of your computer’s installed RAM into the Maximum Size box.
Click Set, and then click OK. Continue to click OK to exit all dialog boxes.
Restart the computer: If you have applications open, select Restart Later, close your applications, then restart Windows. Otherwise, click Restart Now. "
Select Custom Size, and type the amount of your physical RAM plus 300 MB in the Initial Size box. Type three times the amount of your computer’s installed RAM into the Maximum Size box.
I have 16GB RAM
in the Initial Size box : 16384+300=16684MB
in the Maximum Size box:16684x3=50052MB
but in the description of SSD written :
" In order to address any potential lack of memory capacity, the Windows operating system automatically generates a block of virtual memory (pagefile.sys) on the C: drive. For example, a Windows® 7 64-bit system with 4 GB of physical memory would generate 4 GB of virtual memory at boot time.
In the past, before PC Memory (DRAM Modules) were available in high volume, PCs needed to utilize some HDD space to address any memory shortcomings. Today, with PCs featuring 4 GB of memory or more, it is possible to reduce or even eliminate the use of virtual memory. Additionally, using expanded physical memory, rather than creating virtual memory on the SSD, has performance and reliability advantages for the entire system. Some applications may require the use of virtual memory. In this case, please consider your specific application requirements before disabling this feature!!! ”..."SET virtual memory in the Initial Size Box :200MB and in the Maximum Size box: 2048MB"
what is the right choice ???
Please Help

Windows set to default virtual memory : 16348 MB =16GB !
But SSD program Samsung Magician wants virtual memory between in the Initial Size Box :200MB and in the Maximum Size box: 2048MB or 4096MB. If more than 8GB suggests that SSD will work slowly.
Perhaps the description in Adobe execution Help / Optimize / Photoshop is not correct or ?

Error message that no virtual memory pops up & crashes when application is run for more than 1 hour

My application uses VISA serial operations. It has arrays to store data collected from various devices. I reinitialise the arrays each time the index reaches 50.
Data acquisitions is carried out in separate threads by invoking the runVI method.
When i run the application on Win XP continuaously for more than 1 hour it gives an error message that no more virtual memory to complete the task and the system hangs up.
I open the serial port only once and close it when the application is terminated. But serial read/write operations are done continuaously
Is the error caused due to memory leakage? How can i solve the problem. It's very urgent and i shall be thankful if i ge
t the help.

Yes, it sounds like a memory leakage (either that or you're trying to run an advanced app on an old computer w/ little memory and a small hard drive).
Things to try:
1. Ensure it's only labview, and not say labview and another application interacting. This isn't a likely case, but you never know what people have on their boxes and I've seen some weird things with virus scanners. Hit Ctrl-Shift-Esc to get the task manager. Go to processes and watch the memory consumption (click Memory twice to sort in descending order) of the various processes. If labview keeps rising, you've got a leak.
2. If only a reasonable amount of memory is being used, double check your page file settings (read virtual memory).
From the Control Panel
Select System
Select
Advanced Tab
Under Performance, select the Settings button
Select Advanced Tab
Under Virtual Memory, let windows dynamically adjust the page file (and any XP speed tweakers out there can now chime in about how wrong this is. This essentially allows windows to keep upping the virtual memory as needed by various processes.
3. Find the leak. In LV Tools->Advanced->Profile VIs. Turn on memory stats. Start the profiler. Start your vi. If the vi crashes labview totally, you'll have to keep hitting snapshot to find the leaky vi (the one that's memory keeps growing).
4. Upload the vi to the forum so we can give it a looksee.
G'luck
2006 Ultimate LabVIEW G-eek.

Huge amount of virtual memory and system slows to a crawl

I have a mac mini with 5 GB of memory running os x mavericks and server 3, prior to the mavericks upgrade, it ran fine.Now it is showing an excessive amount of virtual memory in use, 40-70 gb, and the system slows to a near stop: e.g. switching apps takes over 30 seconds, starting one takes well over a minute, pressing command tab doesn't respond with list of apps and the display doesn't always wake up. A hard reboot (hold down power button to turn off, then back on) seems to be the only thing that works to get out of this. I tried scheduling a shutdown and reboot with energy saver but that just resulted in a completely non-responsive system. When the display does wake up, there's nothing in the activity monitor memory display that indicates a high memory usage.
I'm considering wiping out the hard drive and reinstalling unless somebody has some other ideas.
Does anybody have similar problems with mavericks and server 3?

I managed to look at it before the system hung up and it looks like devicemgrd is the top user of memory. Of course, I don't know if this is indicative of a problem as I have only 1 server. I saw it up to 1.4 GB just a little bit ago and now it is down below 800MB and dropping.

Running out of memory - not accessing Virtual Memory

Hi there,
I am working on a vision application, and trying to process very large images.
Environment:
LabVIEW 2014 (14.0f1) 64-bit
Vision Development Module 2014
Vision Acquisition Software 2014
Windows 7 Professional SP1 64-bit Settings:
Physical RAM = 8GB
Virtual RAM Settings:
Unchecked: "Automatically manage paging file size for all drives"
Checked: "Custom Size"
Initial Size (MB): 12094
Maximum Size (MB): 24188
I read in a sequence of images in the LabVIEW application and stitch it together. I observe (via Task Manager) the physical memory rise up to approx 7.6GB, and then I am getting the "Out of Memory Error".
So it doesn't seem to be accessing the virtual memory I have allocated? Is there a setting for this that I am missing?
Thanks
Christopher Farmer
Certified LabVIEW Architect
Certified TestStand Developer
http://wiredinsoftware.com.au

LabVIEW does need a contiguous block of memory for every data structure it creates. In addition its arrays are traditionally limited to 2^31-1 elements per dimension since the count member of an array is treated as signed 32 bit integer. This 2^31 limitation very likely doesn't come into play here since IMAQ Vision uses its own internal memory structures and treats IMAQ Vision handles as pointers rather than LabVIEW data handles to make it less prone to unintentional memory copies of the data.
Basically image memory only gets copied when explicitedly calling IMAQ Vision functions or when passing an image to an image control for display in a window. And that is pretty much unavoidable.So if you create an image that uses 4GB of memory you quickly end up consuming 2 or 3 blocks of contiguous 4GB memory. Due to memory fragmentation, even if your system has still 4 or more GB of memory free, calling a function that (temporarely) causes another copy in memory of that 4GB image may still fail, since there is no contiguous block of memory available anymore in the system. And yes that data has to be in physical memory as it is actively used at that moment.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

How to check virtual Memory Info on Solaris 10

Hello,
Can anybody please tell me command used to calculate or check virtual memory configured on my solaris 10 T2000 servers.
From Solaris Management Console I did get this information but I was wondering which command it used to extract this information.
Thanks in Advance

Here is vmstat 2 2 s output on my machine
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr s0 s1 s2 s3 in sy cs us sy id
0 0 0 18874528 3257488 19 47 32 3 3 0 1 2 3 0 0 964 16476 1115 1 1 98
0 0 0 21063104 5781064 36 135 28 0 0 0 0 0 0 0 0 1509 5049 1946 1 1 99
It says system has 21063104KB of Swap but my solaris management console shows
Physical Memory: 8184 MB
Virtual Memory : 21992 MB
Virtual Memory used : 7%(1537/21992)20455 MB Available
I want to know how Solaris Management Console calculated my Virtual Memory.
Thanks

OsX 10.5.1 Virtual memory management

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