A thread's "working memory" -- opstack, lva, other?
Hi,
In reading section 8.1 of the JVM spec:
(http://java.sun.com/docs/books/vmspec/2nd-edition/html/Threads.doc.html#22197)
... I have these two questions:
1) I see it refers to a thread's "working memory". What exactly is this? At first I thought it was any information that was located on the thread's operand stack. Then I thought maybe it was the thread's local variable array. Now I'm not sure what to think... is it totally separate from both of these?
2) This section states that the thread performs the use/assign/load/store/lock/unlock ops, and that that the MMSS (Main Memory SubSystem) performs the read/write/lock/unlock ops. Okay, fine... but then it says later in that section that "A single thread issues a stream of use, assign, lock, and unlock ops..". Okay, so what happened to "load" & "store"? Maybe the term "thread" is supposed to refer only to the execution engine and not this "working mem"? Okay, let's go with that. Then later... "The underlying JVM impl is required to perform appropriate load/store/read/write ops.." Oh really? I thought it just said that the thread and the MMSS perform those? So confused!
Please help,
--Will
Hi,
In reading section 8.1 of the JVM spec:
(http://java.sun.com/docs/books/vmspec/2nd-edition/htm
l/Threads.doc.html#22197)
... I have these two questions:
1) I see it refers to a thread's "working memory".
What exactly is this? At first I thought it was any
information that was located on the thread's operand
stack. Then I thought maybe it was the thread's
local variable array. Now I'm not sure what to
think... is it totally separate from both of these?
2) This section states that the thread performs
the use/assign/load/store/lock/unlock ops, and that
that the MMSS (Main Memory SubSystem) performs the
read/write/lock/unlock ops. Okay, fine... but then
it says later in that section that "A single thread
issues a stream of use, assign, lock, and unlock
ops..". Okay, so what happened to "load" & "store"?
Maybe the term "thread" is supposed to refer only to
the execution engine and not this "working mem"?
Okay, let's go with that. Then later... "The
underlying JVM impl is required to perform
appropriate load/store/read/write ops.." Oh really?
I thought it just said that the thread and the
MMSS perform those? So confused!
Please help,
--Will1. The thread's operand stack is not the same as the working memory of the thread. The term "working memory" is deliberately abstract since where it is located is dependent on the vm implementation (registers, cache etc can all make up the "working memory")
2. The thread can perform load and store operations, but in the specific case you describe the underlying vm implementation performs those operations to obey a certain set of constraints defined later in that section.
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Disk Information:
ST3500418AS disk0 : (465,76 GB)
(null) (disk0s1) <not mounted>: 200 MB
Macintosh HD (disk0s2) / [Startup]: 418,29 GB (219,13 GB free)
BOOTCAMP (disk0s3) /Volumes/BOOTCAMP: 47,28 GB (16,88 GB free)
HL-DT-STDVDRW GA32N
USB Information:
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Apple Internal Memory Card Reader
Thunderbolt Information:
Apple, Inc. iMac
Kernel Extensions:
[not loaded] arcana.PRAM (6.1) Support
[not loaded] com.Immersion.driver.ImmersionForceFeedback (1.0.7) Support
[not loaded] com.acard.driver.ACard6280ATA (1.0.5) Support
[not loaded] com.acard.driver.ACard62xxM (2.0.6) Support
[not loaded] com.acard.driver.ACard67162 (2.0.3) Support
[not loaded] com.acard.driver.ACard671xSCSI (2.0.1) Support
[not loaded] com.acard.driver.ACard6885M (2.0.6) Support
[not loaded] com.acard.driver.ACard68xxM (2.0.5) Support
[kext loaded] com.eltima.ElmediaPlayer.kext (1.0 - SDK 10.4) Support
[not loaded] com.logitech.driver.LogitechForceFeedback (1.0.3) Support
[not loaded] com.vara.driver.VaraAudio (1.0.2) Support
Startup Items:
ArcanaStartupSound: Path: /Library/StartupItems/ArcanaStartupSound
Problem System Launch Daemons:
[not loaded] org.samba.winbindd.plist Support
Problem System Launch Agents:
[failed] com.apple.Kerberos.renew.plist
Launch Daemons:
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.adobe.SwitchBoard.plist Support
[running] com.eltima.ElmediaPlayer.daemon.plist Support
Launch Agents:
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[running] net.culater.SIMBL.Agent.plist Support
User Launch Agents:
[loaded] com.adobe.AAM.Updater-1.0.plist Support
[running] com.genieo.completer.download.plist Support
[loaded] com.genieo.completer.update.plist Support
User Login Items:
None
Internet Plug-ins:
Flip4Mac WMV Plugin: Version: 2.3.8.1 Support
FlashPlayer-10.6: Version: 13.0.0.206 - SDK 10.6 Support
JavaAppletPlugin: Version: 13.9.2 - SDK 10.6 Check version
Flash Player: Version: 13.0.0.206 - SDK 10.6 Support
QuickTime Plugin: Version: 7.6.6
Silverlight: Version: 4.0.51204.0 Support
iPhotoPhotocast: Version: 7.0 - SDK 10.7
iTunes Plug-ins:
Quartz Composer Visualizer: Version: 1.2
3rd Party Preference Panes:
Flash Player Support
Flip4Mac WMV Support
SizzlingKeys Support
ArcanaStartupSound Support
Top Processes by CPU:
99% Installer
3% firefox
1% WindowServer
1% fontd
0% activitymonitord
Top Processes by Memory:
1.79 GB Installer
311 MB firefox
82 MB Mail
66 MB WindowServer
53 MB Finder
Virtual Memory Information:
650 MB Free RAM
2.65 GB Active RAM
44 MB Inactive RAM
686 MB Wired RAM
205 MB Page-ins
1.34 GB Page-outs
I will check out the Genieo now...
Thanks for replys till now. -
touch screen does not work on my ipod when playing music on itunes, but works fine on every other thing on ipod, can anyone help or what is the cause
Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Unsync all music and resync
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar
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