Queue vs. Array question
I had a recent application where I wanted to take 100 samples of something then get the RMS of the dara. This happens in a loop and until program ends. Very basic stuff.
QUEUE Method:
Obtain Queue with 100 elements max.
Enqueue data (data arrives about every 50mS).
Get Queue Status, when Number of Elements is 100....
... Flush Queue and get all elements (that'll be an aray of course) and use RMS funtion.
Repeat
ARRAY Method:
Initialize Array with 100 elements of the DBL 9999.99 (that's a value that can't occur in the data)
Insert data into the array by using Replace Array Subset
When index 100 is not 9999.99, then....
... Put array in the RMS function, then re-initialize array full of 9999.99
Repeat
So my questions are, which should be Faster, which one better Memory Management ?
Thanks!
Solved!
Go to Solution.
LV_Addict wrote:
I had a recent application where I wanted to take 100 samples of something then get the RMS of the dara. This happens in a loop and until program ends. Very basic stuff.
QUEUE Method:
Obtain Queue with 100 elements max.
Enqueue data (data arrives about every 50mS).
Get Queue Status, when Number of Elements is 100....
... Flush Queue and get all elements (that'll be an aray of course) and use RMS funtion.
Repeat
ARRAY Method:
Initialize Array with 100 elements of the DBL 9999.99 (that's a value that can't occur in the data)
Insert data into the array by using Replace Array Subset
When index 100 is not 9999.99, then....
... Put array in the RMS function, then re-initialize array full of 9999.99
Repeat
So my questions are, which should be Faster, which one better Memory Management ?
Thanks!
Queues can pass data "inplace" by just moving the pointer to the data buffer to who ever want to read the queue.
The array method you outlined requires repeatedly peeking in at the data buffer to decide what you need to do plus you have to over-write the buffer with you special "code".
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
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Best way to iniitialize a queue with array elements
Hi Guys
I'm looking for a bit of performance optimization..
I'm developing a noise measurement application using LV8.6 and Win Xp /Win 7.
To put it very simple I have a loop that samples, and a loop that does the math. data is shipped in a queue, producer / consumer style.
So far so good.. Question is - is there a specific and more optimized way to declare this queue?
I was wondering if declaring the queue with an initialized array element of a fixed size (the number of samples pr. read from the sound card will be known at runtime) would produce a queue that would be less heavy on dynamic allocation of memory compared to a queue obtained using a simple control no values.
I've attached a screen dump to maybe make the question more obvious..
I've been thru the "clear as mud" thread, as recommended in other threads that covers this topic - but i gets very high tech, and I kind of lost my way in it.. So looking for a more simple "you should use solution #x, because..."
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Solved!
Go to Solution.I believe (but am not sure) RT FIFOs will allocate this memory for you ahead of time. But, remember they are not deterministic on windows. You need to wire an array constant of the correct size into the FIFO read function also to avoid memory allocation, which is easy to overlook. It's worth looking into, if nothing else, assuming you have RT functions available. WIth this method, the queue size needs to be set, and you run the risk of overflowing and losing elements if not handled correctly.
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Some basic HP Smart Array questions
Hopefully a simple answer to what seems to be a fairly simple question...
If, for example, you have a P800 HP Smart Array with 24 disks and a spare and you want to partition a number of database files across drives to maximise I/O performance (the transaction log file is heavy on writes and the other data and index files are heavy on reads), would it be better to:-
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I'm not so sure yours is a fairly simple question for the HP consumer notebook forum.
You may want to copy and paste your post in the HP Business Support Forum -- Disk Array section.
http://h30499.www3.hp.com/t5/Disk-Array/bd-p/itrc-195 -
Trying to send multiple types in a byte array -- questions?
Hi,
I have a question which I would really appreciate any help on.
I am trying to send a byte array, that contains multiple types using a UDP app. and then receive it on the other end.
So far I have been able to do this using the following code. Please note that I create a new String, Float or Double object to be able to correctly send and receive. Here is the code:
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My main question here is that I have to create a new Float and Double object to be able to send and receive this byte array correctly. However, I would like to be able to have to only create 1object, stuff it with the String, int, Float and Double, send it and then correctly receive it on the other end.
So I tried creating another class, and then creating an obj of this class and stuffing it with the 4 types:
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some_obj_server = (O_struct)ois.readObject();
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I might be making this more complicated than needed, but this was the only way I could figure out how to do this and any help will be greatly appreciated.
If there an easier way to do I certainly will appreciate that advise as well.
Thanks.public class O_struct implements Serializable {
// writing
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O_struct struct = ...;
oos.writeObject(struct);
// reading
ObjectInputStream ois = ...;
O_struct struct = (O_struct)ois.readObject();
I will be sending 1000s of these byte arrays, and I'm sure having to create a new Double or Float on both ends will hinder this.
I am worried that having to create new objs every time it is sending a byte array will affect my application.
That's the wrong way to approach this. You're talking about adding complexity to your code and fuglifying it because you think it might improve performance. But you don't know if it will, or by how much, or even if it needs to be improved.
Personally, I'd guess that the I/O will have a much bigger affect on performance than object creation (which, contrary to popular belief, is generally quite fast now: http://www-128.ibm.com/developerworks/java/library/j-jtp01274.html)
If you think object creation is going to be a problem, then before you go and cock up your real code to work around it, create some tests that measure how fast it is one way vs. the other. Then only use the cock-up if the normal, easier to write and maintain way is too slow AND the cock-up is significantly faster. -
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It looks like you are embarking on a very interesting project. Although you probably have seen many of the following documents, I've linked a few to get you started.
Discussion forum using LabVIEW to read from tables
Developer Zone article about developing a test system
Knowledgebase article about imitations of speed with database toolset
As far as your first question, I would suggest trying out both methods with simple code and testing with a small amount of values to determine which one will be the fastest.
Good luck with your project!
Amanda Howard
Americas Services and Support Recruiting Manager
National Instruments -
Hi, everyone.
I'm writing a lab program which counts the number of occurances of English letters in a line of English text.
The program has the following requirements
Assume that we input only lowercase English text
The program should be able to count the number of occurances of English letters in a text and print out both the number of occurances and the letters. Don't print out letters that don't exist in the text.
I write my code as following:
import java.util.*;
public class Translator
public static void main(String[]args)
Scanner sc = new Scanner(System.in);
System.out.println("Please enter text:");
String text = sc.nextLine();
char[] input = text.toCharArray();
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System.out.println("Letter Number of occurances");
int[] alphabet = new int[26];
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if (input=='a')
alphabet[0] += 1;
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alphabet[1] += 1;
else if (input[i]=='c')
alphabet[2] += 1;
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alphabet[3] += 1;
else if (input[i]=='e')
alphabet[4] += 1;
else if (input[i]=='f')
alphabet[5] += 1;
else if (input[i]=='g')
alphabet[6] += 1;
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alphabet[7] += 1;
else if (input[i]=='i')
alphabet[8] += 1;
else if (input[i]=='j')
alphabet[9] += 1;
else if (input[i]=='k')
alphabet[10] += 1;
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alphabet[11] += 1;
else if (input[i]=='m')
alphabet[12] += 1;
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alphabet[13] += 1;
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alphabet[14] += 1;
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alphabet[15] += 1;
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alphabet[16] += 1;
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alphabet[18] += 1;
else if (input[i]=='t')
alphabet[19] += 1;
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alphabet[20] += 1;
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alphabet[22] += 1;
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alphabet[24] += 1;
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Though having gotten no syntext error complain from the compiler, no matter what I input, the program returns nothing. At first I assumed that it's the first for loop's problem, so that I typed in some System.out.println() methods at the end of some elseif statements. But I still got nothing after this trial. So that I guess it's the char[] input = text.toCharArray();'s problem.
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for(i=0; i<26; i++)
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I have a bit of a silly question about the photo array Apple uses in many of their publications, including the idea behind "CoverFlow". Check this link to see what I mean: http://arstechnica.com/reviews/os/mac-os-x-10-5.ars/2. (Bottom photo)
Is there a way to achieve this? What software accomplishes this? I am a webmaster using iWeb.
I have something similar on the page I have created, but the difference is my photos are straight as they descend, whereas Apple's are straight, yet not square, they seem to be turned, like in this top image of Ubuntu: http://www.taimila.com/?q=node/3. The photos are not rotated, but turned.
Any software ideas?
Any ideas at all?Resizing is a different issue altogether from format.
It's safe to scale the image in ID regardless of the format. If you look in the info panel with the image selected you'll see two resolution numbers listed, actual and effective. Actual is just the resolution at the dimensions the image was saved and is essentially irrelevant. Effective resolution is what you have at the dimensions you are currently using, and that's the number that counts. If that number is in the range that is acceptable for the type of output you are using, there is no need to resize the image in Photoshop at all.
If you MUST resize the image, then yes, convert to something besides jpeg if that's what it is to start. And keep in mind that up-sampling won't improve image quality in general, and downsampling more than 20% or so can cause you to lose fine details (but so will scaling down).
Peter -
Queue or array which is better?
I need a array of clusters to be stored for which the length is not defined. I will update, Add new element to it.
Array or queue can be used to store the clusters. Which one would be better to use in terms of memory usage, fast execution and other performance parameters.
I have some other doubts also.
Consider an array of 8 elements. When an new element is added to the array using 'insert into array',
whether a new copy of 9 elements will be created? or 9th element will be linked after the 8th element (like linked lists)? or something else happens?
If a new copy is created, what happens to old 8 elements in the memory, whether that memory will be freed or kept as such?
The same doubt in case of queue also...
Thanks in advance..
Solved!
Go to Solution.In your case, you want to use a queue.
An array is stored in RAM in consecutive memory locations. When increasing the size of the array, the data structure is increased in size and often entirely moved to a place where it can all fit. If you are resizing an array inside a fairly fast loop, the performance hit would be noticeable.
A Queue is able to place individual elements in their own address chunks in RAM and is much more performance-friendly.
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Hi,
I have one basic question regarding CIF.
We are assigning queue type to scm system at two places.
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Is it required both above setting should have same value?
If it could have different value what is impact?
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Regards,
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let me try to explain cutomizing setting:
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So the first part of my question was kindly and quickly
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Thanks,
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Hello all, i have a couple of questions about multi-dimensional arrays.
The length of this 2-dimensional array is 3.
int table[] [] = {
{1, 2, 3},
{4, 5},
{6, 7, 8, 9},
But what is the length of both own dimensions? How many rows({}) belong to each dimension?
So, what are ? and ? int table [] [] = new int [?] [?] or is it not possible to have a value for ? and ? if you initialized the 2d array?
"Length= number of arrays stored in the multidimension." is this definition good?
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system.out.print(table [t] [i] + � �; } system.out.println();
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private int[][] data;
public ArrayOfArrays(int rows, int cols) {
data = new int[rows][cols];
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public void fillWithRandomNumbers(int lo, int hi) {
Random r = new Random();
for(int[] row: data) {
for(int i =0; i<row.length; ++i) {
row[i] = lo + r.nextInt(hi-lo);
public void display() {
for(int[] row: data) {
System.out.println(Arrays.toString(row));
public static void main(String[] args) {
ArrayOfArrays app = new ArrayOfArrays(5,10);
app.fillWithRandomNumbers(10,20);
app.display();
} -
Rc.conf deamons array - question
i have a question about the deamon array in rc.conf, this is mine:
DAEMONS=(preload syslog-ng dbus acpid netfs alsa crond hal acpi-support fam stbd wicd gpm cups samba asusoled-clockd bluetooth transmissiond sshd)
i know there is an order for some things, i just dont know what, so my question, is my order ok? if not what do i need to switch?
thanksadamruss wrote:
Inxsible wrote:
adamruss wrote:
i have a question about the deamon array in rc.conf, this is mine:
DAEMONS=(preload syslog-ng dbus acpid netfs alsa crond hal acpi-support fam stbd wicd gpm cups samba asusoled-clockd bluetooth transmissiond sshd)
i know there is an order for some things, i just dont know what, so my question, is my order ok? if not what do i need to switch?
thanks
As long as the daemons are independent of each other, it hardly matters what order they are started in. The only thing is that the syslog-ng is used for logging...so you always want to start that before anything else so that in case there are errors in starting any daemon, they will logged and you can see them later.
I am not sure what 'preload' daemon is. Also you might want to start the unimportant ones in the background by prefixing them with an '@' sign so that your boot up would be quicker.
what do you mean unimportant?
You could bacground "alsa gpm cups samba bluetooth".
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I'm currently having a certificate mismatch due to using a wildcard certificate, this only manifests as an error popup when you first start Outlook. Mail works fine, as do calendars - but I want to get rid of that pop-up.
I'm already doing a split-brain DNS for EWS and so forth - mail.domain.com resolves to an internal IP internally and an external IP externally through a "real" DNS entry that's Internet-facing, and this way neither users internally or externally
get certificate errors and everything works - EAS, OWA etc. So it's just this internal issue left.
The question I have is that I read something about it being a bad idea to use the same DNS name for CAS if the same address is externally resolvable (which it would be in this case). Does setting RPCClientAccessServer affect external clients too?
Should I create a second split brain DNS entry instead, like mail-internal.domain.com and point that at servername.domain.local just to use for CAS?
The second part of this question - can I just do: Set-MailboxDatabase MailboxDatabaseName -RpcClientAccessServer “mail.domain.com” and walk away, ie skip the CAS array creation entirely if I were to choose that, assuming mail.domain.com resolves internally
to servername.domain.local?
Or should I definitely create the array and use that instead even though this is a single-server environment?
Thanks.Indeed!
http://blogs.technet.com/b/exchange/archive/2012/03/23/demystifying-the-cas-array-object-part-1.aspx is what Will is referring to.
No, it is not that simple of just changing it and walking away.
Is this Outlook 2013 by any chance?
Cheers,
Rhoderick
Microsoft Senior Exchange PFE
Blog:
http://blogs.technet.com/rmilne
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