Program Design decisions and resource usage.

OK I have a rather lengthy method, and I am trying to decide whether to make it a static method or an instance method.
ok, so I have an object called obj of class ObjectA and a method called validate. I expect that at any one time there will be many many instances of class ObjectA in existence.
I can either make the method an instance method, and refer to it as obj.validate()
or I can make the method static, change the code slightly, put it anywhere, and refer to it as validate(obj)
given that there are many many instances of this class of which obj is an instance, are there any performance or resource decisions involved in deciding whether the method will be static or instance?
Thanks in advance.

BigDaddyLoveHandles wrote:
Fguy wrote:
I don't follow. Why is performance irrelevant?"Performance" isn't irrelevant. If I have a task that needs to run in 1 second and it's currently taking 47 hours, it's certainly relevant.
But that's not what you brought up. You brought up static versus non-static method, The difference is tiny. It's like someone who trying to get the best mileage out of their car asking if they should listen to AM or FM radio.
But we understand. Fixating on micro efficiencies is a disease that's endemic among newbies. The sooner you get over it and focus on writing clean simple code, the better.Itsy bitsy means it goes along the lines of "no difference".
It's possible that it diverges as usage increases but the rate of divergence is also itsy bitsy.
So I guess you don't need to worry, I recommend just writing cleaner, easier to understand code which would rather increase your productivity in the future.

Similar Messages

Feedback nodes / delays and Resource Usage on FPGA

Again it's time for an exotic FPGA semi-noob question from myself.
This has been bugging me for a long time:
When implementing a delay stage on a Virtex-5 target, we have a few options available.
Feedback nodes : Uses LUTs. Virtex 5 has 6-input LUTs. Does this mean that a Feedback node with delay 1 requires the same resources as a Feedback node with delay 6 and a Feedback node with delay 7 requires double the LUTs as one with delay 6?
Example: A single unit delay feedback node for a U16 requires 16 LUTs. What is the LUT usage for 6, 7, 9 delay?
BRAM : Uses few LUTs and Registers. I reckon I understand this one.
Discrete Delay : Can't be used as feedback but is more efficient than feedback nodes? It is written in the help that feedback nodes with the reset support disabled CAN be implemented as SRLs allowing the compiler to choose th ebest option whereas the Discrete Delay primitive forces an SRL Is the SRL implemented using LUTs?.
Which of these options is recommended for which purpose. We're really filling our chip and need to start considering such aspects of number storage.
Sorry for the over-reaching vague questions again.
On the other hand, being on a steep learning curve is actually almost thrilling. Every bit of information helps me learn so thanks for that in advance.
Shane
Say hello to my little friend.
RFC 2323 FHE-Compliant

JLewis wrote:
The number of inputs is only indirectly related to the supported delay. The V-5 and above CLBs (Configurable Logic Blocks) can be configured as dedicated shift registers with delays up to 32 in a single LUT per bit. The main restriction is that these shift registers are not resettable, so you only get this implementation when configured without an initialization value. Delays above 32 can be efficiently implemented in multiple LUTs (ie, 1 LUT per 32 delay). These shift registers are known as SRL16 or SRL32, depending on the target family.
So does this mean that on a LUT-basis, a shift register (with the reset conditions met) with a delay between 1 and 32 costs the same amount of resources? 33-64 delay costs twise that of a single delay? Is this correct? I think I need some benchmarking code.....
JLewis wrote:
Discrete Delay maps to the same shift register implementation as feedback nodes if the reset condition is met. Otherwise, the main difference is that the Discrete Delay exposes the dynamic delay feature available in the hardware shift registers and, as you noted, can't be used in a feedback cycle. If neither of those considerations is a factor in your design, it's just a matter of preference.
This document from Xilinx contains the keys to the kingdom, as far as what hardware capabilities are available: http://www.xilinx.com/support/documentation/user_guides/ug474_7Series_CLB.pdf
That's kind of what I thought.
JLewis wrote:
Hi Shane,
Great questions!
Well thank you, Thanks for the answers.
Say hello to my little friend.
RFC 2323 FHE-Compliant

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Please go to the following URL:
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Downloadable installation files available:
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Acrobat: XI, X | 9,8 | 9 standard
Premiere Elements: 13 |12 | 11, 10 | 9, 8, 7
Photoshop Elements: 13 |12 | 11, 10 | 9,8,7
Lightroom: 5.7.1| 5 | 4 | 3 | 2.7(win),2.7(mac)
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nline. Here is a screenshot:
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Dreamweaver is pretty good these days at showing the page in Design View how it will be viewed when online. HOWEVER having said that it does largely depend on the way you write the css.
I guess for Dreamweaver it's impossible for it to show every concievable way you can write css correctly. Unfortuantely if your css is not compatible with what Dreamweaver likes it won't make a great job of rendering the site correctly in Design View, that's always been the case.
The css is not wrong but I've seen many display issues in Dreameaver Design View caused as a direct result of the css being overly complex to crack simple presentation. I guess it's in the lap of the gods if you are fortunate enough to have found the way to write css that Dreamweaver likes.

JPA Arhitectural Design Decision

Hi,
I'm building a 1 tier web shop, using mostly Ajax, Servlets and JPA and I need your advice on a design decision.
When a user demands to see the products belonging to a particular category of products, my DAO object returns to the servlet a java.util.List<Product>, where Product is a JPA entity. In the servlet class I "manually" create the Ajax XML response, the user gets to see the products, everything is nice and great.
I am not happy with the fact that the list of products remains detached in the servlet class, sort of say, and when another user demands to see the same products another list gets greated. These are objects that have method scope, but still they are on the stack, right? For 100 users who want to see 100 products each, the no. of objects created could cause the application to have a slower reponse time.
So my question is about the design of the application.
I obtain the list of products in the servlet class and construct the XML response. Right before sending the response, should I pass the list of products back to the DAO, and ask the EntityManager to merge the products? Will this reduce the no. of objects my application creates? Shouldn't I do this because I'm merging entities that have not been changed and the merge operation is time consuming?
Should I not pass back the products to the DAO and set each product in the list to reference null and call System.gc() ?
Keeping in mind, that my main concern is application response time, not reduced development time, are there any other suggestions you can make?

first of all, a merge is only used to synchronize a changed entity that is not managed by an entity manager with the database. Why did you even come to the conclusion that you might need this?
No you don't nullify the entities in the list. You let the entire list go when you are done with it. Manually nullifying can hinder the garbage collector, just don't do it unless you have a very good reason for doing so.
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You may want to look into caching. If for example under water you use Hibernate as the persistence provider, search for "hibernate cache" using google.

Design Studio and DSL Bridge for BW (Sizing)

Hi,
I'm doing a sizing exercise on a system where we are only going to use Design Studio, Analysis for Office and their mobile counterpart.
Now, the "Resource Usage Estimator" does not provide options for these two tools, and as far as I can read they don't have that much usage on the server side.
My question is then - does Design Studio use the DSL bridge to connect to BW? Or is it like Analysis, where it connects directly and only gets the login and partial metadata from the SBOP Platform?
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Best regards,
Kris

Thanks Tammy, this solved some of my questions.
I am still uncertain as to how I can estimate the system usage, when the users only use Design Studio and Analysis, which I cannot add into the sizing estimator.
Looking at the sizing guides for DS, Analysis and mobile, I still need to estimate the basic platform.
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Best regards,
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Questioning design decision in java.lang.Character

Having a look at the source code for java.lang.Character, I have the Character class explicitly extends Object
I am using jre1.6.0_07 on window XP
Now the question is what is the reason for such a decision and we all know that any class implicitly extends Object class.
public final class Character extends Object implements java.io.Serializable, Comparable<Character> {
}Regards,
Alan Mehio
London, UK
Edited by: alan_mehio on 24-Jul-2009 12:31

I cannot answer with anything but personal intuition, and give non-conclusive details:
first this is not a design decision, merely a style decision, since, as you mention, any class implicitly extends directly java.lang.Object if not explicitly extending anything else (and at the bytecode level, the source-level difference is undetectable).
As far as style is concerned, I would have assumed that the whole JDK team is required to strictly follow consistent rules, but different classes suggest otherwise.
Sun's public [Code Conventions for the JavaTM Programming Language|http://java.sun.com/docs/codeconv/html/CodeConventions.doc5.html#2991] do not have an explicit rule about this; section +6.4 Class and Interface Declarations+ provide an example with an extends Object clause, but the rule is not explicit in the text; and the previous section 5.2 does provide an example without this clause...
I went on speculating that the developpers for the Character class had a special intent in mind, as they override Object methods equals() and hascode(), but other class in the same package do the same without the explicit extends Object clause (Void, System, Number). At that step I gave up trying to find a reason other than the developers' own style...

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Hi,
I'm using 2 cards for a specific application.
By changing the voltage on the analog outputs (I use both analog outputs) of a pci-6251 I move a scanning mirror to a desired position. After I find the desired position I just leave the voltage output as it is. At this point I use a second card to count photons (not a NI card).
My problem is that the second card doesn't run properly when the pci-6251 is supplying voltage simultaneously. When I turn off the program that controls the voltage output on the pci-6251 the second card works fine. I realized that both cards compete for the computers resource usage. When I don't use the pci-6251 I can have as many as 2M counts/sec on the other card and when I do use the pci-6251 I can only have ~ 80k counts/sec.
I don't understand why the pci-6251 uses so much of the computers resources just to keep a constant voltage output. Is there a why to solve this problem so the 2 cards work in harmony with each other?
Thanks for the help,
Eyal

Hi Eyal,
Are voltage values being constantly written to the analog output when the mirror is in the correct position? This analog output voltage will remain constant until it is changed so one thing that may reduce the use of resources is to write the final voltage values to the PCI-6251 and then close all references to it. This article gives a bit more information about this. Hopefully this will allow your other card to run as quickly as possible. Let me know if this helps.
Regards,
Kent
Applications Engineer
Digital Multimeter Home

Scratch disks and RAM usage

i would like to understand the relationship between scratch disks and RAM usage in Photoshop.
While i was working on a fairly big psb file (2gb), photoshop kept prompting that I was out of memory, but in fact the utilization was only 75% (i had 16gbs total, photoshop was only using 7gb, and i allowed PS to use up to 14gb in total). when it says out of memory, it was actually my scratch disk at fault ( i only set 1 scratch disk, which was my 120gb SSD running out of space).
any idea how I can optimize PS to use up all my RAM first before even touching my scratch disk? (short of using a RAMdisk, please).
thanks!

I am curious about this also. I just reinstalled W-7--have 11 G of physical memory--a ton of hard drive empty space also, and I have been wondering why PS_CC is so slow--since basically I have only put my Security and Browser in addition to Adobe back on the Dell XPS computer..... At least now it does show the downloading percentage (like .psd file) , but that must be what is happening. I do think that some of these "frozen" screens I have been experiencing, was because the program was using scratch disk, instead of the Ram... I came up from CS-5, and can't describe it in detail, but just realize how slow PS-CC is in most everything. Going back and see if reallocating will help...

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how can we find the most usage and lowest usage of table in Sql Server by T-SQL
The table has time stamp column
StartedOn datetime
EndedOn datetime

The Below query has been used , but the textdata column doesnot include the name of the table ServiceLog.
SELECT
FROM
databasename,
duration
fn_trace_gettable('F:\Program
Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\Log\log_148.trc',
default)
WHERE
DATABASENAME='ZTCFUTURE'
AND TEXTDATA
IS
NOT
NULL
--AND TEXTDATA LIKE 'SERVICE%'
order
by cpu
desc;

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I'm brand new to Dreamweaver CS5.5 and here is my problem:
I've made an html page in dreamweaver with a banner, with an additional graphic and some text on top of the banner. It displays just fine in every browser when I view from the local folder, but when I open DW and view, it displays incorrectly in all three design, live and browser views within DW. If I make changes to the css file until it views correctly in design view, it no longer displays correctly from the local folder and it still doesn't view correctly in live or browser view within DW. If what I'm doing isnt going to display accurately in any of the views provided by Dreamweaver as compared to the live server, whats the point in having this software? I could just keep building webpages in notepad and uploading with CoreFTP.
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align="center" is deprecated (obsolete) code in XHTML & HTML5 doc types. Instead of styling markup with HTML, you should be using CSS.
CSS
.center {text-align:center}
HTML
<p class="center">some centered text here</p>
With respect to break tags, in XHTML doc types the correct syntax is <br /> not <br>. However your usage of line breaks is inconsistent with good symantic markup. Use headings <h1> <h2> <h3> <h4> for important keywords. Use <p> for descriptive paragraphs. Use <ul> <li> or <ol> <li> for lists. Line breaks should be used minimally if ever.
XHTML doc types require all tags to be lowercase. Uppercase tags will throw errors.
Your design is too rigid. When text size is increased in browsers, your content is unreadable. See screenshot.
SOLUTIONS:
1) DO NOT USE POSITION ABSOLUTE. You don't need it. Absolute positioning removes content from the normal document flow resulting in a jumbled mess. Use default CSS positioning (none) with margins, padding & floats to align elements.
2) Remove HEIGHT values from all CSS containers. Height limits a container's capacity to hold more content when needed. Container height should always be determined by the amount of content it holds; not explicit values. If required to reveal a background image, for example, use CSS min-height instead of height.
CSS Box Model
http://www.w3schools.com/css/css_boxmodel.asp
CSS Floats
http://www.w3schools.com/cssref/pr_class_float.asp
CSS min-height
http://www.w3schools.com/cssref/pr_dim_min-height.asp
Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media Specialists
http://alt-web.com/
http://twitter.com/altweb
http://alt-web.blogspot.com/

Program Design decisions and resource usage.

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