Yosemite 10.10.1 - File cache

Hi,
I've just installed Yosemite 10.10.1 on my MBP 2011 and the File Cache keeps "eating" my RAM memory while only 4 to 5 app are open.
Does anyone have the same issue? Any recommendation?
Thanks.
Bertil

I have same problem on iMac (20 inch , early 2008) Memory 4GB.
You most likely do not have the same problem. You should start your own new post and not threadjack wbertil's discussion.
If you are using too much virtual memory that would indicate Apps that either have a memory leak or you are running apps that want more RAM than you have available to give.
There is a known issue with Apple Mail when using attachments where it can go crazy and consume huge amounts of virtual memory.
You might also consider running EtreCheck and removing most of the 3rd party additions listed unless you absolutely need them. Especially anti-malware, automatic cleaning utilities, etc... as they tend to actually hurt your performance, not help.
<https://discussions.apple.com/docs/DOC-6174>
If Apple Mail is 'not' your virtual memory issue, then try booting into Safe Mode and see if that improves things. Safe Mode will 'not' load any of the 3rd party stuff you have installed, and if things improve, it is a strong indication that one or more of those 3rd party additions are causing your issues.
<http://support.apple.com/kb/ht1564>

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TechNet Community Support

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Any ideas, how I can solve this.
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To answer your question directly - delete the file or unmount the file system.
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I have a few Questions regarding Data File cache and data cache. based on teh size of the application.
All the settings are changed by using a maxl script.
1. Data File cache-50MB,Data Cache - 100MB
I am using Buffered I/O, then will memory be allocated to Data File cache?
2. It is given in DBAG that data cache & index cache should be set as small as
possbile for both buffered & Direct I/O. The size of one of my application is
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In the DBAG it states data file cache is not used with buffered IO so the answere to 1) should be NO.
For 2) there is a hint in the DBAG that you should check the hit ratio of the caches to verify sizing, only calculatory advice for sizing is given on the calulator cache :-( This would mean for 2b) look at the hit ration if it stays around 1.0 try to decrease it until it drops slightly. Inspect the ratios from time to time.
3) don't know, 64bit should be no problem. But why would you do this anyway?
Example form our settings pag total ~20GB ind ~2GB
outline hat 11 dimensions with a block size of ~340KB largest dense ~400 members, largest sparse ~4000 members, existing blocks ~2.7 milions
The data cache is set to 256 MB, the index cache to 64MB our hit ratios are 1.0 for index cache and 0.77 for data chache. so our data cache could be larger, but the performace of retrievals is around 3.0 seconds which is fine for our users..
4) Check your hit ratios and try to increase or decrease the cahces in small steps (first I'd do the index cache, the if it's fine I'd tune the data cache).
hope it helped a bit..

Why does my MBP have such a huge Memory File Cache?

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Normal in Mavericks. Delete "Memory Cleaner," which is worthless.

Why So Much RAM Going to "File Cache"

Hi,
I seemed to be maxing out my RAM in my 5,1 Mac Pro when I had Adobe Lightroom, PhotoShop, and DxO's OpticsPro 10 open, which are the 3 apps I use in tandem quite a bit. So, I bought 8 GB's more RAM (not a great deal but as much as I can afford at the moment), popped it in on Saturday, and was happy to see that I seemed to have plenty of RAM when the 3 apps were open. By the end of yesterday, however, almost all of my RAM was being chewed up. I opened Activity Monitor this morning and saw that almost 12 GB is being used up by "File Cache". Is this normal? Right now - after installing the 8GB's and after 1.5 days almost being back to where I was before I bought the additional memory, it feels like I'm in a Memory Black Hole. Any insight?
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Yes. OS X uses the file cache to store frequently used code and files in order to make the computer run a little bit faster instead of spending a lot of time loading and unloading data from disk. It improves memory management. It's a good thing.
About OS X Memory Management and Usage
Using Activity Monitor to read System Memory & determine how much RAM is used
OS X Mavericks- About Activity Monitor
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.
Adding RAM only makes it possible to run more programs concurrently. It doesn't speed up the computer nor make games run faster. What it can do is prevent the system from having to use disk-based VM when it runs out of RAM because you are trying to run too many applications concurrently or using applications that are extremely RAM dependent. It will improve the performance of applications that run mostly in RAM or when loading programs.

Activity monitor file cache

In activity monitor it shows that I have 16GB of physical memory, 12.77 GB used memory, 16GB virtual memory.
It also shows App memory 1.9GB, FILE CACHE 9.56GB and wired memory 1.31GB.
My question is in regards to file cache at 9.56GB. What is file cache and why is it so high? Does this mean I should install more memory? I looked file cache up and I think it's memory that has been used but is not being used currently, it's waiting to be used again. Not sure if that's right though, or what it really means. Thanks for any help.
Late 2013 27" iMac, 3.4 GHz i5
16GB ram
OSX 10.9.4

Thank you, that helps. I'm not super tech savvy, but this is what I took from that article.
The app memory + wired memory + file cache = memory used. So since the memory used includes file cache, I'm not really running out of memory as I thought I was. The file cache is basically RAM on stand by in case it's needed by any app. God, I hope I got that right!
The memory pressure on my activity monitor shows green.

Implementing a file caching service

Hi,
I'm implementing a file caching service following this topic: http://www.javaworld.com/javaworld/jw-07-2001/jw-0720-cache.html
My question is which object should i cache? (a File or a FileReader/BufferedReader?)
Thanks and regards,
Robin,

I find this solution at the link you posted too much
overkill. Caching can be done much simpler and more
efficient. What's also missing here is the use of
weak references. In addition lazy loading of the
files is also a plus as the access to files is very
expensive and loading big files can take a while. If
you cache files, than cache just the File objects not
the FileReader or BufferedReader as they can still
claim resources. Just cache all the File objects you
need and load the file only if you really need it via
lazy instantiation of the corresponding data
containers. Also release the data as soon as possible
to avoid OutOfMemory or use at least WealReferences
for the garabage collector to have a chance to
through them out if memory is low.Sorry, but what good is it to cache the File object? As soon as the data is requested, you would still have to go and look it up.
(Not that I see too much sense in this file caching anyway, as long as the OP isn't creating a proxy server.)

Why do we minimize windows file cache?

Hi,
Can anybody please explain why do we minimize the windows file cache?
help.sap.com has the below lines..
"The Windows file cache directly competes with SAP programs for physical memory by pushing them out of the memory. Therefore, you should minimize the file cache"
Can anybody explain what does this exactly mean?
Thanks,
Debasis.

Hi Debasis,
when I first read your question I thought:
"This must be a joke-question! Surely nobody who has to deal with highly complex system landscapes like the ones NetWeaver makes necessary would have a real issue with understanding this basic concept!"
But on the other hand, we all started working in this business with more or less sound knowledge about the technical foundations that influence the systems we work with.
So, here is my try on this:
Main memory (in most computers today also known as RAM) is a resource to store data shared among all programs that run on that computer at the same time.
The SAP NetWeaver workprocesses (disp+work.exe) are such programs. And the Windows filesystem management is also a kind of program in that sense.
Both of these two programs need RAM to do their work. The more memory they get, the better they can do their work.
If you decide to install NetWeaver to a computer the documentation developers assumed, that this will be the main use for this computer. For example, they did not expect that you use the same computer as a file- or print server or webserver or server for anything else (although this would be possible).
Therefore it was decided that, to make the NetWeaver program work best, it would be best to give it as much resources (like RAM) as possible. Obviously this means that these resources have to be taken from other programs, just like the filesystem cache of Windows.
And there we are: by reducing the file cache of the Windows server we allow other programs (like our NetWeaver) to use more RAM for it's own purposes.
Usually there are not so much 'file actions' on a server where NetWeaver is running that this is a problem. Most of the data processed in a workprocess is read over the network from the database and stored back to it, so no need to keep a big cache for 'file actions'.
If your question just refered to the "pushing out of the memory" part, no problem either!
As you may have realized by know the demand for RAM is large. In fact its so large, that most often it is too expensive to buy as much RAM for a computer as it would be needed to fullfill all the demand.
Fortunately, not all data stored into the RAM is needed all the time. Actually, most parts of it are not used for most of the time. This characteristic of the demand for RAM opens the opportunity to save parts of the data in the RAM into a file (no, you won't need the filesystem cache for this file ) and thereby make space for other data to be stored in RAM.
This functionality is also called 'paging' as the data is written to disks in chunks which are called 'pages'.
Ok, with this faboulous feature we got the option to put more data into the RAM than we actually have installed into our computer, which is really great.
Unfortunately when we want to access our data again, it has to be loaded back from disk into memory. And for that some other part of the data in RAM needs to be saved to disk first to make space for the data we want to access.
This 'writing out - reading in' of data takes time. Programs like the workprocesses need to wait until the operating system has done this for them. Until this is done, they can basically do nothing than wait - and so can the users that see a 'hourglass' mousepointer when they called a new transactiom.
So 'paging' is really bad for the system performance and for the response times of the system.
Therefore it is usally wanted to keep this paging down on a level where it does not affect the workprocesses too badly.
And this can only be done by either putting more RAM into the machine or reducing the demand for RAM - which is done e.g. by minimizing the filesystem cache.
I hope this lengthly explanation helped you to get the idea.
Best regards,
Lars

Yosemite 10.10.1 - File cache

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