Question On Multiple Processors

I have a question I am hoping the gurus can clarify. I have an Ultra running two processors. Does the OS utilize both processors all the time (running OS functions and applications) or do the applications have to be specifically written to use multiple processors? Thank you in advance.
-Jim

Thank you Richard, that helps greatly. I guess I need to read up on multi-threading.
Thank you,
James Corrill
Generally, if the OS has something to do and there is
an idle processor, it will utilize the processor. If
you have 10 processors and at least 10 things to do,
all the processors can be kept busy. This could be 10
unrelated programs or a single program that is
designed to use at least 10 threads. Some of the
things to do may also be running OS functions such as
processing interrupts or handling TCP/IP.
On the other hand, if you typically have just one
single-threaded, cpu-intensive task to run, the second
processor won't help much; and more processors
probably won't help at all. In such a case, you would
want to consider breaking the program into parallel
processes or threads.
Richard

Similar Messages

Using multiple processors and threads

Hi there,
Just a quick question... I am working on an application that is VERY processor intensive. There is no real way to improve this, but I do have access to a multiple processor server.
Can anyone tell me if Java code can be written to utilise more than one processor? I assume due to the VM, that this is unlikely - and that one must resort to the operating system used on the server, where hopefully the VM can be forced to use more than one processor.
If this is not possible - has anyone written applications that run across several VMs? Is this possible, and what is the performance like?
Thanks for any help.
Nick

The Java VM will indeed utilize multiple processors. Just create a seperate thread to do your work and it will schedule it. In fact it's way easier than most languages:
public class MyThreadimplements Runnable {
public MyThread() {
try {
Thread newThread= new Thread(this);
newThread.setPriority(Thread.MIN_PRIORITY); // see other enumerations to boost priority
newThread.start();
} catch(Exception e) {
System.err.println(e);
public void run() {
// do your work here
}

Does PS CS6 take better advantage of multiple processors than PS CS5?

Hi,
According to the article on this Adobe Support page, it says: There is a law of diminishing returns with multiple processors- The more processors you use, the less you get from each additional processor. Therefore, Photoshop isn't necessarily four times as fast if you have four microprocessors.
My question is, is this part of PS improved in this new version? If anyone knows about this, your response would be greatly appreciated!
Thank you in advance.
Jung

newalchemist wrote:
So, do you mean that new PS can take "full" advantage of more than four threads now?
Good question. This was with a simple Image size (from 25,000 pixels square to 15,000 pixels square)
Six cores, but only only six threads, maxing out at about 70%. I helped itself to lots of RAM though.

LDAP design question for multiple sites

LDAP design question for multiple sites
I'm planning to implement the Sun Java System Directory Server 5.2 2005Q1 for replacing the NIS.
Currently we have 3 sites with different NIS domains.
Since the NFS over the WAN connection is very unreliable, I would like to implement as follows:
1. 3 LDAP servers + replica for each sites.
2. Single username and password for every end user cross those 3 sites.
3. Different auto_master, auto_home and auto_local maps for three sites. So when user login to different site, the password is the same but the home directory is different (local).
So the questions are
1. Should I need to have 3 domains for LDAP?
2. If yes for question 1, then how can I keep the username password sync for three domains? If no for question 1, then what is the DIT (Directory Infrastructure Tree) or directory structure I should use?
3. How to make auto map work on LDAP as well as mount local home directory?
I really appreciate that some LDAP experta can light me up on this project.

Thanks for your information.
My current environment has 3 sites with 3 different NIS domainname: SiteA: A.com, SiteB:B.A.com, SiteC:C.A.com (A.com is our company domainname).
So everytime I add a new user account and I need to create on three NIS domains separately. Also, the password is out of sync if user change the password on one site.
I would like to migrate NIS to LDAP.
I want to have single username and password for each user on 3 sites. However, the home directory is on local NFS filer.
Say for userA, his home directory is /user/userA in passwd file/map. On location X, his home directory will mount FilerX:/vol/user/userA,
On location Y, userA's home directory will mount FilerY:/vol/user/userA.
So the mount drive is determined by auto_user map in NIS.
In other words, there will be 3 different auto_user maps in 3 different LDAP servers.
So userA login hostX in location X will mount home directory on local FilerX, and login hostY in location Y will mount home directory on local FilerY.
But the username and password will be the same on three sites.
That'd my goal.
Some LDAP expert suggest me the MMR (Multiple-Master-Replication). But I still no quite sure how to do MMR.
It would be appreciated if some LDAP guru can give me some guideline at start point.
Best wishes

Sorry for posting a wrong question Loading multiple files!!

Sorry for posting a wrong question Loading multiple files!!
As per my understanding
Sorry for posting a wrong question Loading multiple files!!
As per my understanding only a standard Dat file can be compared with one single dat file.Because Eacg dat file will be containing its own values. So multiple files cannot be compared.
Am assuming dat files containing time(s) and acceleration values(g). G value for each file differs.
Thanku!!
Solved!
Go to Solution.

Hi Rash.patel,
I'm still not sure I follow you. When you say "Dat" file, do you mean the DIAdem 8.x standard file with the *.dat header and usuall a *.r64 binary file or two that it references, or do you mean some other specific data file with the extension *.dat or do you just mean a generic data file?
DIAdem can certainly load multiple files into the Data Portal at the same time, so you must be referring to either a limitation of the "*.Dat" file you're talking about or correcting yourself that all the data you want to compare turns out to be in one "Dat" file.
Brad Turpin
DIAdem Product Support Engineer
National Instruments

CP8: Custom question using multiple TEBs / Scrollable Text Widgets

Hi,
I want to create a custom question with multiple Text Entry Boxes (TEBs) or Scrollable Text Widgets (STWs) that is compatible with HTML5.
User has to enter just one word in each TEB / STW i.e. a one line STW.
I want the user to be able to Retry the question i.e. click Retry button to automatically clear the TEBs / STWs that are incorrect.
Question is not being scored or reported to an LMS.
TEBs:
I'm assuming you can't clear a TEB so I tried using a STW.
STWs:
FYI: I'm clearing the STW using Null.
The issues I am trying to resolve are:
1. Disabling the Enter key so that the 1 line STW will behave like a TEB i.e. doesn’t move to the 2nd line, and the Up Down scrollable indicators aren't displayed.
There is a post that suggests executing JS on Slide Enter but I already have an Advanced Action associated with Slide Enter.
https://forums.adobe.com/thread/1451011?q=disabling%20Enter%20key
2. When retrying a question how do I disable STWs i.e. ones that contains a correct answer so user can't change it. (I know the Disable action won't work)
I am using Captivate 8.0.1.242 on Windows 8.
Thanks for your help.
Regards
Donal.

Some answers, probably not all what you want. I blogged about using the Scrolling Text (formerly the TextArea widget) several times.
In Captivate 8 you can indeed control what is shown in the Scrolling Text Interaction, by changing the associated variable. That was not possible before this version (have been begging for it, finally with success) and it is still not possible for a Text Entry Box. You can change the value of the variable, but it will not be visible in the TEB.
An interaction is automatically reset when re-entering the slide, maybe that can help you as well? That is not the case for a TEB.
Disabling has no sense for an interaction that is static, only for interactive objects (and interactions). That means that you can disable a TEB, but not a Text Scrolling Interaction.
Maybe this tip to prevent changing a correct answer for the interaction: replace the interaction by a similar looking text container with the value of the variable if the answer is correct.

Utilizing Multiple-Processors in Classic Mode?

I have four PPC based scientific programs that will only run in classic mode. They take hours to run each, and so I am considering purchasing a Power Mac G5 Quad (2.5 GHz) to do so. Question: Can I run the 4 programs simultaneously, and can I ensure that each one runs on a different processor so that I will get the desired performance increase? (I currently run the programs on an iMac G5, OS X 10.4.11, and can run them all together if I want - but that doesn't improve performance...).
thanks,
Photonic

Apple made G4/500DP, 533DP, 800DP etc. And there are still cpu upgrades for pre-MDD models. The 1.42DP was the fastest made at the time, but not the only one, and not without some heat and noise issues.
http://www.welovemacs.com/appoma.html
http://www.welovemacs.com/g5machines.html
http://www.welovemacs.com/m96.html
http://www.welovemacs.com/g41gh80gb.html
One report showed Classic running on G5.
http://www.xlr8yourmac.com/G5/g5firstimpressions.html
And for some applications, they aren't written to, or benefit from running on multiple cores. And Classic is probably just such an application. OS 9 was not known for being efficient at giving foreground and background apps more cpu cycles.
Comparing cpu performance:
Finding a way to run Classic efficiently on a current 2.8GHz 8-core Mac Pro?
http://www.geekpatrol.ca/2006/08/mac-pro-3ghz-benchmarked/
http://www.geekpatrol.ca/2006/12/eight-core-mac-pro-benchmarks/
You said that right now it takes hours to run currently on your iMac G5. Your Intel iMac running @ 3GHz might be able to run SheepShaver, but the more I looked into it, the more iffy it seemed. But that would answer the question of whether you need to look at a new $1500 Quad G5, or invest in something else. or use your new iMac.
http://www.barefeats.com/imp02.html
http://www.macworld.com/article/133467/2008/05/imaccomparison.html
SheepShaver - Although it took me a few days to get it up and running, in hindsight, SheepShaver was the easiest of the three to install and configure. This is due to the fact that, while it requires a ROM file like the others, this ROM file can be obtained from Apple installation CDs or update disk images available from their Web site. http://www.atpm.com/12.09/classic.shtml
http://gwenole.beauchesne.info/en/projects/sheepshaver

Question about multiple LTS

Hi,
I am currently working with the rpd and a general doubt pops up... in the physical layer I have dimensions related, like for example Person, related to another dimension City and for example Age (with Foreign Key join):
City -< Person
Age -< Person
So in order to have a true star schema in the BMM, I need to create a single logical table with these three physical tables, right? The question is how.
I can add the physical tables as 3 logical table sources, or have one single logical table source, mapped to these three physical tables.
What is the difference, if any? Can someone explain, please? I always use the first choice (multiple logical table sources, each of them mapped to one physical table), but is it better to have just one single logical table source?
Thanks in advanced :)

I'm not surprised that it works fine, but there is a chance that it can lead to some problems. Let me explain.
You now have three LTS in your Logical dimension table Person.
Person
Age
City
When you create a report with columns from City and the Fact table, the BI Server will need to set up a join path between Fact and City table. There is no other option then via the physical Person table. So the BI Server decides for you to create a join between fact and person and person and city.
When the City is joined to other tables in the physical layer then the BI Server might create another join path between Fact and City, because it thinks it is more efficient. This can lead to inccorect results.
When you add the three physical tables to one LTS, you explicitly tell the BI Server, to create a join path from Fact to City table via the Person table.

Good CCIE question: Can multiple site-2-site VPNs support dynamic routing protocols?

Hi All,
Was not sure if this should be posted in LAN routing, WAN routing or VPN forums: I have posted here as the VPN tunnels are the limiting factors...
I am trying to understand if it is possible to have dynamic routing between LANs when using site to site VPNs on three or more ASA55x5-x (9.0).
To best explain the question I have put together an example scenario:
Lets say we have three sites, which are all connected via a separate site-2-site IKEv2 VPNs, in a full mesh topology (6 x SAs).
Across the whole system there would be a 192.168.0.0/16 subnet which is divided up by VLSM across all sites.
The inside / outside interfaces of the ASA would be static IPs from a /30 subnet.
Routing on the outside interface is not of concern in this scenario.
The inside interface of the ASA connects directly to a router, which further uses VLSM to assign additional subnets.
VLSM is not cleanly summarised per site. (I know this flys against VLSM best practice, but makes the scenario clearer...)
New subnets are added and removed at each site on a frequent basis.
EIGRP will be running on each core router, and any stub routers at each site.
So this results in the following example topology, of which I have exaggerated the VLSM position:
(http://www.diagram.ly/?share=#OtprIYuOeKRb3HBV6Qy8CL8ZUE6Bkc2FPg2gKHnzVliaJBhuIG)
Now, using static route redistribution from the ASAs into EIGRP and making the ASAs to be an EIGRP neighbour, would be one way. This would mean an isolated EIGRP AS per site, but each site would only learn about a new remote subnet if the crypto map match ACL was altered. But the bit that I am confused over, is the potential to have new subnets added or removed which would require EIGRP routing processes on the relevant site X router to be altered as well as crypto map ACLs being altered at all sites. This doesn't seem a sensible approach...
The second method could be to have the 192.168.0.0/16 network defined in the crypto map on all tunnels and allow the ASAs routing table to chose which tunnel to send the traffic over. This would require multiple neighbours for the ASA, but for example in OSPF, it can only support one neighbour over a S2S VPN when manually defined (point-to-point). The only way round this I can see is to share our internal routing tables with the IP cloud, but this then discloses information that would be otherwise protected by the IPSEC tunnel...
Is there a better method to propagate the routing information dynamically around the example scenario above?
Is there a way to have dynamic crypto maps based on router information?
P.S. Diagram above produced via http://www.diagram.ly/

Hi Guys,
Thanks for your responses! I am learning here, hence the post.
David: I had looked in to the potential for GRE tunnels, but the side-effects could out weight the benifits. The link provided shows how to pass IKEv1 and ISAKMP traffic through the ASA. In my example (maybe not too clear?) the IPSEC traffic would be terminated on the ASA and not the core router behind.
Marcin: Was looking at OSPF, but is that not limited to one neighbour, due to the "ospf network point-to-point non-broadcast" command in the example (needed to force the unicast over the IPSEC tunnel)? Have had a look in the ASA CLI 9.0 config guide and it is still limited to one neighbour per interface when in point-to-point:
ospf network point-to-point non-broadcastSpecifies the interface as a point-to-point, non-broadcast network.When you designate an interface as point-to-point and non-broadcast, you must manually define the OSPF neighbor; dynamic neighbor discovery is not possible. See the "Defining Static OSPFv2 Neighbors" section for more information. Additionally, you can only define one OSPF neighbor on that interface.
Otherwise I would agree it would be happy days...
Any other ideas (maybe around iBGPs like OSPF) which do not envolve GRE tunnels or terminating the IPSEC on the core router please?
Kindest Regards,
James.

JVM's suport for multicore processors and multiple processor systems

Hi all,
Do you have any concrete information about Sun Hot JVM 1.5's support for multi-core processors and also its support for multi processor systems. I ask this because i am looking at deploying a multi threaded application written in Java 5 and want to know the best CPU arrangement for optimal performance.
Does JVM run itself on multiple CPUs?
Does JVM run native threads on multiple CPUs ? at the same time.
Is there a place where i can find out the exact behavior of the JVM in sus environments ?
Thanks.

Hi,
Sun's JVM runs very well on multi-thread/core/chip systems and provides several mechanisms to scale well in such environments (for example Thread Local Allocation Buffers (TLABs), parallel gargabe collection threads etc.). Java threads are 1:1 mapped to operating system threads. There are lots of options that allow you to configure the JVM wrt number of gc threads and so on, although the defaults should in most cases work well. There is a lot information available at http://java.sun.com/docs/performance/index.html and some (quite outdated) information about threading at http://java.sun.com/docs/hotspot/threads/threads.html.
Nick.

Question about multiple audio tracks

Hello,
I see that imovie has only 2 audio tracks available when creating a movie. I need more than two since I will be working with a voiceover track, a soundtrack and at least one background/environment track all at one time. I won't be able to use the sound recorded with the video so that "track" is not an option.
My question is; Am I out of luck here and need to spend the 1K for studio pro to add more multiple audio tracks?
Also, I tried working with garageband but since all of my audio tracks import in at a minimum of 40 beats per minute, the voiceovers are all sped up and sound chipmunky.
Thanks for any help!

Well I didn't mean to irritate you...LOL And yes, I realize that this is the iM 6 forum but the gist of my question was related to multiple audio tracks in iM and thought I would ask about it in the forum pertaining to the latest release.
I had already posted a question in the GB forum regarding the bpm problem and found no answers so I was pretty much about to shelve that idea and forgo the whole garageband thing; this without knowing about the new "swap" features. I just updated to iM 6 yesterday.
As far as the "on-tape" raw audios: I was working on my movie in iM4. I wanted to add more audio bits but I don't have a proper mic for my G5 so I recorded the audio bits on dv8 tape through my camcorder. I imported the video (the image was the inside of my lens cap!), extracted the audio, took those audio files and imported them into GarageBand. That's when I noticed the bpm problem.
I'm sorry about the lack of info I originally gave but like I said, I had pretty much gave up on the idea of using GarageBand. I'm pretty new at this and I'm trying to decide what I need in terms of software to get what I want out of my movie. I'd be willing to pay for FCxp but still looking into whether I need to do just that or whether I can get by by using imovie and now it looks like GarageBand too.
ah, thanks for that
what irritates me, Prince wrote:
The audio tracks were voiceovers that came from my
dv8tape, imported into imovie4.
... ehm, but this is the iM 6(six) section, as said,
iM 6 allows now "swapping" files with GB3... (I'm way
back in the 90ies.... see my specs... )
so, video is in some iM, and he wants to use the
actual "on-tape" raw audios...
I thnik we need a little more detail...

Question about multiple listeners and vip addresses in rac.

We have a 2 node rac cluster running 10.2.0.3 on rhel4 on the itanium platform. We have a need where we want to connect the 2 hosts up to another network temporarily by configuring an additional network interface on each server so that we can test some connections from a different network.
My question is can you configure multiple listeners on the same server in which the newly added listener can be configured to service requets on the new network interface?
Because it's rac would you need to configure an additional vip address? I am not sure that you can have multiple vip's on a server?
Has anyone configured rac in such a way, any help is appreciated.

can you configure multiple listeners on the same server in which the newly added listener can be configured to service requets on the new network interface?Yes, you can but you should not be doing this. Listener is a node specific resource and one listener can server multiple services. You actually can create multiple services within the database for different set of users and all can be registered to the same listener.
Because it's rac would you need to configure an additional vip address? What do you mean by additional IP?
You have installed 10g RAC where you have already configured virtual IPs. Why do you want to have additional one? node1 - static ip1, vip1, pvtip1
node2 - static ip2 vip2, pvtip2
total 6
I am not sure that you can have multiple vip's on a server?Nothing to do with the server, they are based on public IP. Yes you can create multiples vip's based on same public IP. This is possible, But you do not need to do this in RAC environment.

Question about Multiple Choice Quiz

I have multiple choice quiz that I'd like make more complex. The quiz is based on a movie clip with a series of questions on different frames and the same set of answer buttons on each frame (no keyframes on the answer button layer). The user clicks a button to go from one question to the next. There’s a scoring mechanism that displays the number of correct answers (score), the total number of answers clicked (right or wrong), and the percentage of right answers.
For each question, only the first answer counts toward the score. If you click correctly the first time, a point is added to the score and to the total. If you click incorrectly the first time, a point is added to the total only. After you give the first answer, right or wrong, you can still click on all the answers to see which answer was correct; the correct answer button changes in appearance and the correct sound cue plays but no point is added to the score or total. If you click on a wrong answer after you’ve given the first answer, the incorrect sound cue plays but no point is added to the total. In other words, you can’t help or hurt your score after clicking on the first answer, but you can determine which answer was correct.
This all works fine.
But now I want to make a similar exercise that has TWO questions on each frame. The answers both come from the same set of answer buttons. The question is how to preserve the “only the first click counts” mechanism for each of the two answers, since clicking on the answer to the first question will mark the frame as “answer has been given” and prevent any further scoring. There needs to be a point given for each correct answer on the frame.
Here’s the code from an answer button in the existing quiz. How would I modify this to allow for two answers per frame?
on (press) {
                /* This code executes whether this is the first click on the answer button or a subsequent click. If the answer is correct (if this is frame 1 or 3), the correct sound cue plays and the answer button changes its appearance, and if the answer is incorrect (if this is any other frame), the incorrect sound cue plays */
                if (_currentframe == 1){
                        _parent.snd_obj.playsound("correct", "cue1");
                        answer1_mc.gotoAndStop(2);
                }else if (_currentframe == 3){
                        _parent.snd_obj.playsound("correct", "cue1");
                        answer1_mc.gotoAndStop(2);
                }else{
                        _parent.snd_obj.playsound("incorrect", "cue2");
                /* This code executes only if this is the first click on the answer button. It checks to see if an answer has been clicked in this frame, and if not, it marks the answer as given (so this code will be executed only once) and then adds one point to the total, one point to the score for correct answers, and re-calculates the percentage */
                if (!_parent.answerGiven[_currentframe]) {
                        _parent.answerGiven[_currentframe] = true;
                        _parent.total = _parent.total + 1;
                        _parent.percent = Math.round((_parent.score / _parent.total) * 100);
                       if (_currentframe == 1){
                               answer1_mc.gotoAndStop(2);
                               _parent.score = _parent.score + 1;
                               _parent.percent = Math.round((_parent.score / _parent.total) * 100);
                      }else if (_currentframe == 3){
                           answer1_mc.gotoAndStop(2);
                           _parent.score = _parent.score + 1;
                           _parent.percent = Math.round((_parent.score / _parent.total) * 100);
                       }else{
                           _parent.snd_obj.playsound("incorrect", "cue2");

This is indeed a very random issue. I have seen this in earlier versions of Captivate as well. I always create my template files from the blank theme, so I don't think it is specific to the theme.
As for solutions, sometimes changing the quality of slide to high worked, other times just reopening Captivate worked. Here are some of the solutions I have found on these forums:
1. Create one more answer than I need (ie for a 4 answer question, create 5 answers) and then delete answer B.
2. Uninstalled/reinstalled my Captivate 6 software
Sreekanth

Question About Multiple Choice/True/False Answer Alignment

When I insert a multiple choice or true/false question, The second response (answer B for either question type, is mis-aligned with it's radio button:
The Master Slide for these questions looks like this:
I can't figure out how to align the answer with its radio button. Any ideas?
I'm using CP 7.0.1.237 on Windows 7.

This is indeed a very random issue. I have seen this in earlier versions of Captivate as well. I always create my template files from the blank theme, so I don't think it is specific to the theme.
As for solutions, sometimes changing the quality of slide to high worked, other times just reopening Captivate worked. Here are some of the solutions I have found on these forums:
1. Create one more answer than I need (ie for a 4 answer question, create 5 answers) and then delete answer B.
2. Uninstalled/reinstalled my Captivate 6 software
Sreekanth

A question about multiple computer syncing

Hey i'm getting an iphone soon, and here's my situation.
I have an apple ibook, and an imac G5, which both have data and information (songs, videos, contacts, etc.) that i'd like on my iphone. The itunes running on both computers use the same itunes account, with the same password and user name and everything. So my question is, could i register the iphone on the iMac G5, get the songs on it from that computer, then go and plug it in to the apple iBook and sync the songs from that computer?
thanks for the help,
jim

These observations are from my own personal experience syncing my iPhone between an iMac G5 and a Dell Windows XP system...
- iMac G5 was the original activation computer and it's iTunes library became the "master" library
- when connected to Dell, acts like any other iPod that is not synced with the computer - you can see songs but cannot copy them
- there is no "file system" mode to the iPhone, unlike iPod, so there is no way to move files around
- syncing contacts and calendar events between the iMac (iCal and Address Book) and the Dell (Outlook 2007) was painless.
- iPhone does not appear to support multiple categories of calendar entries (e.g. "work" and "home")
- iPhone DOES work with Exchange Server as long as exchange has IMAP turned on
- iPhone DOES support multiple email accounts (I have three on mine and they work great)

Question On Multiple Processors

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