Sharing JVM applet cache among multiple users (crosspost)

Does anyone have experience sharing a single JVM applet cache among multiple users?
(This is a crosspost of http://forum.java.sun.com/thread.jspa?threadID=5157018. I know crossposting is frowned on, but it went a week without replies in the plug-in forum.)
Our browser plugin clients run in a Citrix environment where Windows Terminal Services servers host the client sessions for multiple users and the users only have a thin client hardware device at their desks. We've discovered that as a consequence of optimizing certain aspects of the Citrix environment a user's JVM cache is remote to the server hosting his/her browser session, and that the remote caching is a performance bottleneck.
Turning applet caching off improves performance considerably, but we'd like to get the cache directed locally to the server hosting the browser session and turn caching back on. But since hundreds of users times tens of servers in the "Citrix farm" adds up to a lot of cache disk space, we're wondering about users sharing a JVM cache. This already happens when one runs multiple browser/plugin sessions locally on a regular workstation. But what about fifty users' separate plugins sharing a single applet cache? It appears from file timestamps that jars'/classes' idx files in a cache are updated when a file is loaded from the cache. What if multiple browser plugins were trying to do this concurrently? Is there a risk of locking, or a data integrity exposure? Or are those idx updates insignificant since they don't affect the last modified date or the sticky cache version number? (Most apps use a 1_5_0_2 JRE, but some apps require a 1.4 plugin.)
Thanks,
Brian

This sounds very similar to a problem that's occuring for us at the moment. Did you ever find some solution to this problem?
Regards,
Jon.

Similar Messages

Sharing JVM applet cache among multiple users

Our browser plugin clients run in a Citrix environment where Windows Terminal Services servers host the client sessions for multiple users and the users only have a thin client hardware device at their desks. We've discovered that as a consequence of optimizing certain aspects of the Citrix environment a user's JVM cache is remote to the server hosting his/her browser session, and that the remote caching is a performance bottleneck.
Turning applet caching off improves performance considerably, but we'd like to get the cache directed locally to the server hosting the browser session and turn caching back on. But since hundreds of users times tens of servers in the "Citrix farm" adds up to a lot of cache disk space, we're wondering about users sharing a JVM cache. This already happens when one runs multiple browser/plugin sessions locally on a regular workstation. But what about fifty users' separate plugins sharing a single applet cache? It appears from file timestamps that jars'/classes' idx files in a cache are updated when a file is loaded from the cache. What if multiple browser plugins were trying to do this concurrently? Is there a risk of locking, or a data integrity exposure? Or are those idx updates insignificant since they don't affect the last modified date or the sticky cache version number? (Most apps use a 1_5_0_2 JRE, but some apps require a 1.4 plugin.)
Thanks,
Brian

This sounds very similar to a problem that's occuring for us at the moment. Did you ever find some solution to this problem?
Regards,
Jon.

Sharing Itunes Music Library among Multiple User Accounts on One Mac

I have 3 user accounts set up on the computer and one itunes account authorized on all 3 user accounts. I have the music library files placed in the shared folders and permissions set up to allow all users to read & write the music. However, only my user account (the main account with admin privileges) is able to access the music unless I log into my user account, run iTunes with sharing enabled, then exit to the login window. Then the other users can access the shared iTunes library. I have preferences setup to use the same library folders.
An earlier version of iTunes used to allow me to do this, and iPhoto still does allow a similar setup with my photo library.
Is there a way to fix this?
Thanks!

I have an iMac at home with 4 users. I've recently struggled with this and thought I had a working solution ...
I created a new iTunes folder off of root. I then logged in as each user and set the path on their Advanced Tab to /iTunes/iTunes Music/ and dragged and dropped their local iTunes Music folders (~/Music/iTunes/iTunes Music/) into iTunes. This copies files that aren't there but skips anything that might be in two peoples library.
Then iTunes 8.1 came out and now things are broken. I've rebuilt the index by doing an Add to Library but my Podcasts don't download any more. 8-(

Sharing IPhoto library among multiple users

I'd like to make sure that each of the user accounts on my Mac can easily access the same complete IPhoto library -- to add, edit and remove photos, and to be able to use the photos in the IWeb, GarageBand and other projects associated with those accounts. What the best way to get this to happen (and while I'm at it, I guess I'd like to do the same things with ITunes.)

webalias rex:
There are several ways that can be done. The one that has the best success rate is to put the library on an external FW HD which the ownership set to be ignored. Here's Apple's document on that method: iPhoto: Sharing libraries among multiple users.
Here are some other methods that have been discussed.
http://ad.hominem.org/log/2005/07/acl.php
http://discussions.apple.com/thread.jspa?messageID=2151309&#2151309
http://discussions.apple.com/thread.jspa?threadID=579542&tstart=0
http://www.captnswing.net/2004/03/20/shareiphotolibrary.html
http://www.macosxhints.com/article.php?story=20050904072808460
Do you Twango?
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've written an Automator workflow application (requires Tiger), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 08 libraries. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

How Can I Share iPhoto Library/Keywords Among Multiple Users

Hi there! I am having a bit of a dilemma where I am trying how I can have several users access a shared iPhoto library (as well as retain their own personal iPhoto libraries). Basically, I have a handful of (three) users that need to be able to store/search against a common shared photo library - ideally, in iPhoto.
I understand that I can share albums through iPhoto (users are using a mix of iPhoto '08 and '09) on one account as long as iPhoto is running - a serious drawback. When I tried sharing photos via this method I was able to see the shared albums; however the keywords that were defined for those photos were not available. This presents two questions:
1) Can iPhoto share its library among multiple users (including keywords, etc) so that if a user account (let's call it "media") shares out selected albums that the viewing users (user1 and user2) can search against the keywords in the host library? Or is this not possible with iPhoto?
2) Is there another way of sharing photos that is more efficient and can be hosted on our private servers? The interface in iPhoto is amazing - and if there was an application that allowed for that same sort of feel/tagging we would be good to go...

Well here is the weird thing. If I was sharing out the library from my computer, I could search for the keywords (and obtain results) as expected. However, if I went to another computer that was viewing my shared library, searching by the same keyword did not return any results.

What is the best way to sync multiple collections of contacts among multiple users?

(I originally submitted this question under the "Mac OS X Technologies" section, but got no response. I'm submitting a duplicate here because this is where all the smart folks are! My apologies that my question is only partially related to OS X Server . . . )
What is the best way to sync multiple collections of contacts among multiple users on iOS and OS X?
For example, suppose I have three collections of contacts: Bob's, Sally's, and Common. I want Bob to be able to access and sync Bob's contacts and Common contacts, and Sally to access and sync Sally's contacts and Common contacts. Bob and Sally never need to access or sync each other's contacts. Bob and Sally would both sync and share contacts in Common.
How would I best implement this? It's my understanding I have three options for managing contacts across iOS and OS X: 1. iCloud accounts, 2. Install OS X server, or 3. Install and manage Darwin CardDAV directly. Which method would best support what I wish to do?
I am a seasoned Unix geek well versed in the terminal, so I am prepared to get my hands dirty as much as necessary to achieve what I want. Also, it is sufficient if syncing takes place over WiFi on the local network, in fact, that is desirable versus syncing over the cloud.

Thanks for your reply Nick101. I see my example was oversimplified. When I say "multiple groups of contacts over multiple users" I'm really referring to N groups of contacts over N users.
So I need to add Fred, who can access and sync Bob's contacts, Sally's contacts, and Common contacts, as well as Fred's contacts. Can I do it with OS X server?
You mention you keep your and your partner's contacts administered locally. What keeps you from administering them through OS X server as well?
I am guessing this can all somehow be accomplished with multiple contact accounts, but I can't find any information on the web explicitly describing this.

Can InDesign indicate who has a file open among multiple users?

Hi,
Does anyone know if InDesign can indicate who has a file open among multiple users?
Thank you

No. All you'll know is that it's open.
Bob

Trouble with sharing iPhoto library among multiple users

I followed the directions in this guide to share my iPhoto library between two accounts. However, it does not allow both users to open the library. One user gets a message that it is locked. I have ensured that the disk image and the library give everyone read/write access and that ownership of the volume is ignored. I've also ensured that the other user is logged out of iPhoto. However, I still get the error.
http://support.apple.com/kb/HT1198?viewlocale=en_US
I am, however, able to share the iPhoto library if I don't use the disk image and if I just store the library in the Shared folder and by giving both users read/write access. However, I'm afraid that this will someday crash on me based on this article.
Does anyone have any experience with this??

The disk image approach looks complex. I'd avoid it. Note that all the users need to have read/write access to the disk image plus the folder that it's inside of ...
The use of an external disk looks simplest and I've done that myself so I know that it works.
Also, here is another solution: http://www.fatcatsoftware.com/iplm/Documentation/iPLM/pgs/sharing.html

Sharing in-memory database among multiple processes

From the bdb document, due to disk-less operation, it is not possible to share in-memory among multiple processes.
I am wondering, if it is possible to use DB_ENV but without DB->sync or any other sync() function call, such that the database, cache, etc in the shared region not flushed to the disk, to achieve disk-less operation. Please share your thought.

See "Using the Resource Capping Daemon on a System With Zones Installed" in SystemAdministration Guide: Solaris Containers-Resource
Management and Solaris Zones. You can get the manual from docs.sun.com.
Chapter 10 discuss physical memory control.
Regards

Sharing a single session among multiple portlets for single application (e.g. wInsight)

Does anyone know the best practices way for sharing a single Session for an application (running on a single Porlet server) among multiple portlets on a page?
For example, the application wInsight uses 3 frames (navigation, search results - tabular, search results - chart) which need to communicate via the application's session scope. It is not just that we do not want for a single user to be running multiple sessions, but they really do share variable parameters this way.
So far I can only think of trying to build a one true portlet and two empty containers on page load. I would use the portlet to establish the session with the Portlet server and then transfer the session information to the other two empty containers to instantiate their respective portlets. I haven't tried this yet, but will do so soon...
Any help and feedback would be greatly appreciated.

Karen,
You can easiliy create several portlets out of a Struts application. For detailed instructions, refer to the Struts section of the Portal Developer's Guide.
Good luck,
Peter

Sharing an iTunes Library across multiple user account and a network.

Sharing an iTunes Music Library across multiple user accounts.
Hello Everybody!
Firstly, this was designed to be run in Mac OS X 10.4 Tiger. It will not work with earlier versions of Mac OS X! Sorry.
Here's a handy tip for keeping your hard drive neat and tidy, it also saves space, what in effect will be done is an iTunes music library will be shared amongst multiple users on the same machine. There are advantages and disadvantages to using this method.
• Firstly I think it might be worthwhile to state the advantages and disadvantages to using this approach.
The advantages include:
- Space will be saved, as no duplicate files will occur.
- The administrator will be able to have complete control over the content of the iTunes library, this may be useful for restricting the content of the Library; particularly for example if computer is being used at and education institution, business or any other sort of institution where things such as explicit content would be less favorable.
- The machine will not be slowed by the fact that every user has lots of files.
The disadvantages to this system include.
- The fact that the account storing the music will have to be logged in, and iTunes will have to be active in that account.
- If the account housing the music is not active then nobody can use the iTunes library.
- There is a certain degree of risk present when an administrator account must be continually active.
- Fast User Switching must be enabled.
Overview:
A central account controls all music on the machine/network, this is achieved by storing iTunes files in a public location as opposed to in the user's directory. In effect the system will give all users across the machine/network access to the same music/files without the possibility of files 'doubling up' because two different users like the same types of music. This approach saves valuable disk space in this regard and may therefore prove to be useful in some situations.
This is a hearty process to undertake, so only follow this tutorial if you're willing to go all the way to the end of it.
Process:
Step 1:
Firstly, we need to organize the host library, I tidied mine up, removing excess playlists, random files, things like that. this will make thing a bit easier in the later stages of this process.
Once the library is tidied up, move the entire "iTunes" folder from your Home directory to the "//localhost" directory (The Macintosh HD) and ensure that files are on the same level as the "Applications", "Users", "Library" and "System" directories; this will ensure that the files in the library are available to all users on the machine (this also works for networks)
Optionally you can set the ownership of the folder to the 'administrator' account (the user who will be hosting the library.), you may also like to set the permissions of 'you can' to "Read & Write" (assuming that you are doing this through the user who will host the library); secondly you should set the "Owner" to the administrator who will be hosting the library and set their "access" to "Read & Write" (this will ensure that the administrator has full access to the folder). The final part of this step involves setting access for the "Others" tab to "Read Only" this will ensure that the other users can view but not modify the contents on the folder.
Overview:
So far we have done the following steps:
1. Organized the host library.
2. Placed the iTunes directory into a 'public' directory so that other users may use it. (this step is essential if you plan on sharing the library across multiple accounts on the same machine. NOTE: this step is only necessary if you are wanting to share you library across multiple accounts on the same machine, if you simply want to share the music across a network, use the iTunes sharing facility.
3. set ownership and permissions for the iTunes music folder.
Step 2:
Currently the administrator is the only user who can use this library, however we will address this soon. In this step we will enable iTunes music sharing in the administrator's account, this will enable other users to access the files in the library.
If you are not logged in as the administrator, do so; secondly, open iTunes and select "Preferences" from the "iTunes" menu, now click the "Sharing" tab, if "share my library on my local network" is not checked, the radio buttons below this will now become active, you may choose to share the entire libraries contents, or share only selected content.
Sharing only selected content may be useful if their is explicit content in the library and minors use the network or machine that the library is connected to.
If you have selected "share entire library" go to Step 3, if you have selected share "share selected playlists" read on.
After clicking "share selected playlists" you must then select the playlists that you intend to share across your accounts and network. Once you have finished selecting the playlists, click "OK" to save the settings.
Overview:
In this step we:
1. Enabled iTunes sharing in the administrator's account, now, users on the local network may access the iTunes library, however, users on the same machine may not.
Step 3:
Now we will enable users on the same machine to access the library on the machine. This is achieved by logging in as each user, opening iTunes, opening iTunes preferences, and clicking "look for shared music". now all users on the machine may also access the library that the administrator controls.
This in effect will mean that the user will not need to use their user library, it will be provided to them via a pseudo network connection.
As a secondary measure, I have chosen to write a generic login script that will move any content from the user's "Music/iTunes/iTunes Music" directory to the trash and then empties the user's trash.
This is done through the use of an Automator Application: this application does the following actions.
1. Uses the "Finder" action "Get Specified Finder Items"
1a. The user's "~/Music/iTunes/iTunes Music" folder
2. Uses the "Finder" action "Get Folder Contents"
3. Uses the "Finder" action "Move to Trash"
4. Uses the "Automator" action "Run AppleScript"
4a. with the following:
on run {input, parameters}
tell application "Finder"
empty trash
end tell
return input
end run
IMPORTANT: Once the script is adapted to the user account it must be set as a login item. in order to keep the script out of the way i have placed it in the user's "Library" directory, in "Application Support" under "iTunes".
Overview:
Here we:
1. Enabled iTunes sharing in the user accounts on the host machine, in effect allowing all users of the machine to view a single iTunes library.
2. (Optional) I have created a login application that will remove any content that has been added to user iTunes libraries, this in effect stops other users of the machine from adding music and files to iTunes.
Step 4:
If it is not already enabled, open system preferences and enable Fast User Switching in Accounts Options.
Summary:
We have shared a single iTunes library across multiple user account, while still allowing for network sharing. This method is designed to save space on machines, particularly those with smaller hard drives.
I hope that this hint proves to be helpful and I hope everybody will give me feedback on my process.
regards,
Pete.
iBook G4; 60GB Hard Drive, 512MB RAM, Airport Extreme Mac OS X (10.4.6) iWork & iLife '06, Adobe CS2, Final Cut Pro. Anything and Everything!!!

how to share music between different accounts on a single computer

Any improvements in sharing an iPhoto Library between multiple users?

It is possible and Apple Approved to share an iPhoto Library between multiple users, but the Library must be stored on a drive or disk image that ignores permissions:
http://tech.kateva.org/2008/10/apple-supports-multi-user-iphoto.html
This doesn't work for me. Has Apple changed anything with iLife '09 to make it easier to share a Library? For example, have they changed from the prior Package format?
Message was edited by: jfaughnan

Alternatives to a trip to the Terminal:
If you want the other user to be able to see the pics, but not add to, change or alter your library, then enable Sharing in your iPhoto (Preferences -> Sharing), leave iPhoto running and use Fast User Switching to open the other account. In that account, enable 'Look For Shared Libraries'. Your Library will appear in the other source pane.
Any user can drag a pic from the Shared Library to their own in the iPhoto Window.
Remember iPhoto must be running in both accounts for this to work.
If you want the other user to have the same access to the library as you: to be able to add, edit, organise, keyword etc. The problem here is that OS X works very hard to keep your data safe and secure from the other users. You're trying to beat what's built in to the system. So, to beat the system
Quit iPhoto in both accounts
Move the iPhoto Library Folder to an external HD set to ignore permissions. You could also use a Disk Image or even partition your Hard Disk.
In each account in turn: Hold down the option (or alt) key and launch iPhoto. From the resulting dialogue, select 'Choose Library' and navigate to the new library location. From that point on, this will be the default library location. Both accounts will have full access to the library, in fact, both accounts will 'own' it.
However, there is a catch with this system and it is a significant one. iPhoto is not a multi-user app., it does not have the code to negotiate two users simultaneously writing to the database, and trying will cause db corruption. So only one user at a time, and back up, back up back up.
Lastly: This method seems a little clunky at first, but works very well. Most importantly, it uses the System to do the job for you.
Create a new Account on your Mac, call it Media. Create an iPhoto Library there. (BTW: This will work for iTunes too.)
Enable Sharing on the Library:(Preferences -> Sharing), leave iPhoto running and use Fast User Switching to open the other accounts. In those accounts, enable 'Look For Shared Libraries'. The Library will appear in the other source pane.
This means that both users will be able to see the pics. If you want to use a pic then simply drag it from the shared Library to your own in the iPhoto Window. This means that each user can have their own edits.
If you want to add photos to the Library: Log into the Media account for that purpose.
To make it all seamless: Set your Mac to log into the Media Account automatically. Set iPhoto to launch on log-in. Then switch to your own account using Fast User Switching.
Net result: a Library that's permanently available to all users but also protected. Each user can have their own versions of the pics if they want.
No partitioning, no permissions issues. Uses no extra disk space. What's not to like?
Regards
TD

Sharing one iphoto library between multiple user accounts

I hav an extensive photo library and would like to share this across multiple users on the one computer. Am I able to do this without having to move the library to an external hard drive?

What you mean by 'share'.
If you want the other user to be able to see the pics, but not add to, change or alter your library, then enable Sharing in your iPhoto (Preferences -> Sharing), leave iPhoto running and use Fast User Switching to open the other account. In that account, enable 'Look For Shared Libraries'. Your Library will appear in the other source pane.
Any user can drag a pic from the Shared Library to their own in the iPhoto Window.
Remember iPhoto must be running in both accounts for this to work.
If you want the other user to have the same access to the library as you: to be able to add, edit, organise, keyword etc. The problem here is that OS X works very hard to keep your data safe and secure from the other users. You're trying to beat what's built in to the system. So, to beat the system
Quit iPhoto in both accounts
Move the iPhoto Library Folder to an external HD set to ignore permissions. You could also use a Disk Image or even partition your Hard Disk.
In each account in turn: Hold down the option (or alt) key and launch iPhoto. From the resulting dialogue, select 'Choose Library' and navigate to the new library location. From that point on, this will be the default library location. Both accounts will have full access to the library, in fact, both accounts will 'own' it.
However, there is a catch with this system and it is a significant one. iPhoto is not a multi-user app., it does not have the code to negotiate two users simultaneously writing to the database, and trying will cause db corruption. So only one user at a time, and back up, back up back up.
Lastly: This method seems a little clunky at first, but works very well. Most importantly, it uses the System to do the job for you.
Create a new Account on your Mac, call it Media. Create an iPhoto Library there. (BTW: This will work for iTunes too.)
Enable Sharing on the Library:(Preferences -> Sharing), leave iPhoto running and use Fast User Switching to open the other accounts. In those accounts, enable 'Look For Shared Libraries'. The Library will appear in the other source pane.
This means that both users will be able to see the pics. If you want to use a pic then simply drag it from the shared Library to your own in the iPhoto Window. This means that each user can have their own edits.
If you want to add photos to the Library: Log into the Media account for that purpose.
To make it all seamless: Set your Mac to log into the Media Account automatically. Set iPhoto to launch on log-in. Then switch to your own account using Fast User Switching.
Net result: a Library that's permanently available to all users but also protected. Each user can have their own versions of the pics if they want.
No partitioning, no permissions issues. Uses no extra disk space. What's not to like?
Regards
TD

Shared Photo & Music Libraries for Multiple Users on Same Machine

I've setup multiple users on a single machine and I'm trying to have a common shared folder for photos (w/ Adobe PSE) and music (w/ iTunes). First, on photos:
-Tried setting up a folder on /users/shared/pictures. How can I "share" the main folder and have permissions carry down to all subfolders and files?
-I've given the other user permission, but when logged on, Finder window only displays icon, not preview of image? In cover flow mode, image shows up, though?
-Is this the best approach or is /me/public the better way or /me/pictures (shared) a better way?
And then on music:
-recommendations on best approach to have a single library with multiple users and multiple iTunes accounts.
Thanks in advance

The iTunes sharing is for sharing music between computers on a network.
To share music on a single PC, read this article
http://docs.info.apple.com/article.html?artnum=93195

Sharing the same keychain across multiple user accounts

Hello, Anyone know how to do this? Thanks in advance!

I have tried, without success to share a keychain between two accounts. In Keychain Access -> Edit -> Keychain List there is a Shared checkbox next to each keychain. If I click on that, the keychain disappears from the list of Keychains that you see when you open Keychain Access (and if necessary, click on Show Keychains). The keychain does not show up on any other account, either. The keychain is still there in ~/Library/Keychains.
Seems pretty useless, as does Apple's article "Mac OS X 10.4 Help -- Administering keychains for multiple user" at <http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh1775.html>.
Some idiot in the security world recommended that we split our account into administrator and non-administrator, and normally log on only to the non-administrator account. This forces me to try to share files, folder, and keychains, so I can get any work done while logged on from the administrator account. Mostly, I don't think Unix, or Mac OS X, was designed to share things. (This is not a Mac versus PC statement. I only have one account on the PCs I'm forced to use at work -- it may be just as hard or harder on a PC.)
This security advice is stupid! Don't do it. Do everything on one account or you will waste hours and hours trying to bridge the gap between them.
But I would like to know how to share a keychain, since Apple's help files SAY you can. Only it does not work.

Sharing JVM applet cache among multiple users (crosspost)

Similar Messages

Maybe you are looking for