# Comparison of the results of the performance and the sum of the sum of array elements

I did a comparison of the performance of "Add table" with 2 other methods (an Add elements and function of ddot BLAS) to see who was the fastest and also to compare their results, given that I was watching a few slight differences.

Conclusions
BLAS ddot's quicker (just a little), then add items, then add it in a loop of table

BLAS ddot and add items table give identical results almost all the time.

I don't know why add items in a loop manually gives a slightly different result. I understand there are any rounding due to finite precision errors, but why is it different for the 2 other methods?

This classic of digital computing: the quality of the result depends on the order of operations.

A simple example is the calculation of a * b / c with a, b, c equal to 25, 200 and 100 respectively. The result should be 50, but if a, b and c are U8, the result depends on the order of operation, as shown in the example below. DBL and data non-entier, the difference is of course that much smaller, but still there are!

In your case, the difference also stems from the order of operations:

-in the table add-in, the product of all the elements is calculated first and then the elements of the array are added.

-in the loop, the addition is performed after each multiplication.

Tags: NI Software

### Similar Questions

• A fundamental question/problem with the like undefined array element

Hello everyone,

Thanks for looking at my problem. I am very new script and javaScript, and I encountered a strange problem. I always try to solve all my problem myself, with documentation (it helps to learn) or as a last resort with the help of google. But in this case, I'm stuck. I'm sure its something very simple and elementary.

Here I have a code that simply loads a text file (txt), load the contents of the file in a "var glad." This summary text file a font family name, every name on a new line, as:

Albertus

Antenna

Antique

Arial

Arimo

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Barber1

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Barber4

Birch

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undefinedAlbertus

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----------------------------

----------------------------

Here is my code:

#target illustrator

Open the file

var myFile = new File ("c:/ScriptFiles/installedFonts-Families.txt");

openFile var = myFile.open ("r");

check if it is open

if(OpenFile == true) {}

else {\$.writeln ("the file does not load, check the name or the path") ;}}

load the contents of the file into a variable

myFile.close ();

var ch;

var x = 0;

var fontList = [];

for (var i = 0; i < content.length; i ++) {}

ch = content.charAt (i);

If ((ch)! == (string.fromCharCode(0)) (10))) {}

fontList [x] += ch;

}

else {}

x ++;

}

}

for (i = 0; i < fontList.length; i ++) {}

\$.writeln (fontList [i]);

}

doc. Close (SaveOptions.DONOTSAVECHANGES);

-----------------

-----------------

Thanks for any help or an explanation. If you have any tips on how to improve my practices or any suspicion, please do not hesitate to say. Thank you

better, you try something like this:

```#target illustrator

//open file
var myFile = new File ("c:/ScriptFiles/installedFonts-Families.txt");
var openFile = myFile.open("r");

//check if open
if(openFile == true){
else {\$.writeln("The file did not load, check the name or the path");}

//load the file content into a variable
var fontList = [];

fontList = content.split ("\n")
myFile.close();

for ( i = 0; i < fontList.length; i++) {
\$.writeln(fontList[i]);
}

//doc.close (SaveOptions.DONOTSAVECHANGES);
```

Have fun

A note:

The real font names may be different from your own list for example:

Arial! = ArialMT

Birch! = BirchStd

Blackoak! = BlackoakStd

Concerning

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Hello

[Apex 4.2.1] Oracle 11g.

I create an interactive report using some elements of the page. Now, I am able to write these items in a table by using a button with a dynamic action:
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Thorsten

Thorsten wrote:
OK, now I know that I need to use

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```

Do you know why?

It only works when the page is rendered

Create an item hidden on your page or use if available. for example P35_ID

Change your dynamic action that has this process

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```

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Hello!

Hard drive of my new PC (C) is 1 TB (processor Samsung 7i, Windows 8.1). It doesn't have any other disk/partition. How this space is safe to use to store large files (videos, esp., stored in the native video library file) without harming the performance and speed?

And if I create another partition (D) and just use it for storage, it will make much difference compared to the above?

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Sunday, March 1, 2015 10:59 + 0000, AnaFilipaLopes wrote:

And if I create another partition (D) and just use it for storage, it will make much difference compared to the above?

The Question

Partitions, how much should I have on my hard drive, what do I use
each of them for, and what size should each one be?

It s a common question, but unfortunately this doesn t have a
only simple, just answer to all the world. A lot of people will respond with
the way they do, but their response isn't necessarily best for the
person seeking (in many cases it isn't right even for the person)
response).

Terminology

First, let's rethinking the terminology. Some people ask "should I".
partition my drive? That s the wrong question, because the
the terminology is a little strange. Some people think that the word
"partition" means divide the drive into two or more partitions.
That s not correct: to partition a drive is to create one or several
partitions on it. You must have at least one partition to use
He who think they have an unpartitioned disk actually
have a player with only one partition on it and it s normally
Called C:. The choice you have is to have more than one
partition, not that it's the partition at all.

A bit of history

Back before Windows 95 OEM Service Release 2 (also known as Windows
95 (b) was published in 1996, all MS-DOS and Windows hard drives have been set
using the file system FAT16 (except for very tiny to aid
FAT12). That 16-bit only because were used for addressing, FAT16 has a
maximum 2 GB partition size.

More than 2 GB of hard disks were rare at the time, but if you had
one, you must have multiple partitions to use all the available
space. But even if your drive was not larger than 2GB, FAT16 created
Another serious problem for many people - the size of the cluster has been
more great if you had a larger partition. Cluster sizes increased from 512
bytes for a partition to no greater than32Mb all the way up to 32 KB for a
partition of 1 GB or more.

More the cluster size, the space more is wasted on a hard drive.
That s as space for all the files is allocated in whole clusters
only. If you have 32 KB clusters, a 1 byte file takes 32 KB, a file, a
greater than 32 k byte takes 64 k and so on. On average, each file
about half of his last group waste.

If large partitions create a lot of waste (called "soft"). With a 2 GB
FAT16 drive in a single cluster, if you have 10,000 files, each
lose half a cluster of 32 KB, you lose about 160 MB for relationships. This s
back in an important part of a player that probably cost more than \$400
1996 - around \$ 32.

So what did the people? They divided their 2 GB drive in two,
three or more logical drives. Each of these logical drives has been
smaller the real physical disk, had smaller clusters, and
so less waste. If, for example, she was able to keep all the partitions
less than 512 MB, cluster size was only 8 KB, and the loss was reduced to a
a quarter of what it would be otherwise.

People partitioned for other reasons also, but back in the days of
FAT16, it was the main reason to do so.

The present

Three things have changed radically since 1996:

1. the FAT32 and NTFS file systems came along, allowing a larger
partitions with smaller clusters and so much less waste. In
with NTFS, cluster sizes are 4 K, regardless of the size of the partition.

2 hard drives have become much larger, often more than 1 TB (1000 GB) in
size.

3 hard drives have become much cheaper. For example, a 500 GB drive
can be bought today for about \$50. That s 250 times the size of this
Player 2Gb typical 1996, about one-eighth of the price.

What these things mean together which is the reason to be old to have
multiple partitions to avoid the considerable wastage of disk space left.
The amount of waste is much less than it used to be and the cost of
that waste is much less. For all practical purposes, almost nobody does
should no longer be concerned about slack, and it should no longer be
has examined when planning your partition structure.

What Partitions are used for today

There are a variety of different ways people put in place several
scores of these days. Some of these uses are reasonable, some are
debatable, some are downright bad. I'll discuss a number of Commons
partition types in the following:

1. a partition for Windows only

Most of the people who create such a partition are because they believe
If they never have to reinstall Windows properly, at least they
He won t lose their data and he won t have to reinstall their applications.
because both are safe on other partitions.

The first of these thoughts is a false comfort and the second
is downright bad. See the analysis of the types of partition 2 and 4
below to find out why.

Also note that over the years, a lot of people who find their windows
partition that has begun to be the right size proves to be too
small. For example, if you have such a partition for Windows and later
partition is too small.

2. a partition for installed programs

This normally goes hand in hand with the partition type 1, a partition for
just Windows. The thought that if you reinstall Windows, your
installed application programs are safe if they are in another
partitions is simply not true. That s because all programs installed
(with the exception of an occasional trivial) have pointers to the inside
Windows, in the registry and elsewhere, as well as associated files
buried in the Windows folder. So if Windows, pointers and
the files go with it. Given that the programs need to be reinstalled if Windows
the fact, this reasoning to a separate partition for programs not
work. In fact, there is almost never a good reason to separate
Windows of the software application into separate partitions.

3. a partition for the pagefile.

Some people think mistakenly that the pagefile on another
score will improve performance. It is also false; It doesn t
help and often I hurt, performance, because it increases the movement of the head
to get back to the page to another file frequently used
data on the disk. For best performance, the paging file should normally
be on the most widely used score of less used physical player. For
almost everyone with a single physical disk than the same drive s
Windows is on C:.

4. a partition for backup for other partitions.

Some people make a separate partition to store backups of their other
or partitions. People who rely on a "backup" are a joke
themselves. It is only very slightly better than no backup at all.
because it leaves you likely to be simultaneously the original losses
and backup for many of the most common dangers: the head crashes and other
types of drive, serious glitches to power failure, near lightning
strikes, virus attack, even stolen computer.  In my opinion,.
secure backup must be on a media removable and not stored in the
computer.

5. a partition for data files

Above, when I discussed separate Windows on a clean partition,
I pointed out that separate data from Windows is a false comfort if
He of done with the idea that data will be safe if Windows ever
must be reinstalled. I call it a false comfort that's because
I'm afraid many people will rely on this separation, think that their
data are safe there and so do not take measures to
Back it up. In truth the data is not safe there. Having to reinstall
Windows is just one of the dangers to someone a s hard disk and not
probably even one. This kind of "backup" falls into the same
category, as a backup to other partitions partition; It lets you
sensitive to the simultaneous loss of the original and the backup on many of
the most common dangers that affect the entire physical disk, not
just the particular partition. Security comes from a solid backup
diet, not how partition you.

However, for some people, it may be a good idea to separate Windows and
programs on the one hand of the data on the other, putting each of the
two types into separate partitions. I think that most people
partitioning scheme must be based on their backup system and backup
plans are generally of two types: whole hard disk imaging
or data only backup. If you back up data, backup is
usually facilitated by the presence of a separate with data only partition;
to save just the score easily, without having to
collect pieces from here and elsewhere. However, for
those who backup by creating an image of the entire disk, there is
usually little, if any, benefit the separation of data in a partition of
its own.

Furthermore, in all honesty, I must point out that there are many
very respected people who recommend a separate partition for Windows,
Whatever your backup plan.  Their arguments haven t convinced
me, but there are clearly two views different here.

6. a partition to image files

Some people like to deal with the images and videos as something separate
other data files and create a separate partition for them. To my
the spirit, an image is simply another type of data and there is no

7. a partition for music files.

The comments above related to the image files also apply to music
files. They are just another type of data and must be dealt with the
just like the other data.

8. a partition for a second operating system to dual-boot to.

For those who manage several operating systems (Windows Vista, Windows
XP, Windows 98, Linux, etc.), a separate partition for each operating
system is essential. The problems here are beyond the scope of this
discussion, but simply to note that I have no objection to s
all these partitions

Performance

Some people have several partitions because they believe that it
somehow improves performance. That s not correct. The effect is
probably low on modern computers with modern hard disks, but if
whatever it is, the opposite is true: more music mean poorer
performance. That's because normally no partition is full and it
so are gaps between them. It takes time for the drive s

Organization

I think a lot of people overpartition because they use scores as a
organizational structure. They have a keen sense of order and you want to
to separate the apples from the oranges on their readers.

Yes, separating the different types of files on partitions is a
technical organization, but then is to separate different types of
files in folders. The difference is that the walls are static and
fixed in size, while the files are dynamic, changing size automatically
as needed to meet your changing needs. This usually done records
a much better way to organize, in my opinion.

Certainly, partitions can be resized when necessary, but except with the latter
versions of Windows, which requires a third-party software (the and the
possibility to do so in Windows is primitive compared to the third-party
solutions). These third party software normally costs money and not
any point and how stable it is, affects the entire disk.
with the risk of losing everything. Plan your partitions in
first place and repartitioning, none will be necessary.  The need
to repartition usually occurs as a result of overpartitioning in
the first place.

What often happens when people organize with partitions instead
records are that they make a miscalculation of how much room they need on each
This partition, and then when they run out of space on the partition
When a file is logically, while having plenty of space
on the other hand, they simply saving the file in the score of "poor".
Paradoxically, therefore, results in this kind of score structure
less organization rather than more.

So how should I partition my drive

If you read what came before, my findings will not come as a
surprise:

1. If your backup set is the image of the entire disk, have just one
single (usually c partition :));

2. If you backups just data, have two partitions one for Windows and
application programs installed (usually c :)), the other for data
(normally D :).)

With the exception of multiple operating systems, it is rarely
any advantage to have more than two partitions.

• What is the best software to improve performance and free hard disk cleanup. I used MacKeeper, but I'm tired of paying annual fees for this service.

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You shouldn't have these software.  See discussion of Klaus1

Do not install MacKeeper

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But since I intend to make some photos and video editing in the computer and watch a few videos, I wondered if the work will be compromised.

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Hello

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Oracle 10g.

----------------------

Query

UPDATE FACETS_CUSTOM. MMR_DTL

SET

CAPITN_PRCS_IND = 2,

FIL_RUN_DT = Current_fil_run_dt,

ROW_UPDT_DT = dta_cltn_end_dttm

WHERE CAPITN_PRCS_IND = 5

AND HSPC_IND = 'Y '.

AND EXISTS (SELECT 1

OF FACETS_STAGE. CRME_FUND_DTL_STG STG_CRME

WHERE STG_CRME. MBR_CK = MMR_DTL. MBRSHP_CK

AND MMR_DTL. PMT_MSA_STRT_DT BETWEEN STG_CRME. ERN_FROM_DT AND STG_CRME. ERN_THRU_DT

AND STG_CRME. FUND_ID IN ('AAB1', '1AA2', '1BA2', 'AAB2', '1AA3', '1BA3', ' 1 B 80 ', ' 1 HAS 80 '))

AND EXISTS (SELECT 1

OF FACETS_CUSTOM. FCTS_TMS_MBRID_XWLK XWLK

WHERE XWLK. MBR_CK = MMR_DTL. MBRSHP_CK

AND MMR_DTL. PMT_MSA_STRT_DT BETWEEN XWLK. HSPC_EVNT_EFF_DT AND XWLK. HSPC_EVNT_TERM_DT);

Explain the plan of the query

-----------------------------------------------

Hash value of plan: 3109991485

-------------------------------------------------------------------------------------------------------

| ID | Operation | Name                  | Lines | Bytes | Cost (% CPU). Time |

-------------------------------------------------------------------------------------------------------

|   0 | UPDATE STATEMENT.                       |     1.   148. 12431 (2) | 00:02:30 |

|   1.  UPDATE                       | MMR_DTL |       |       |            |          |

|   2.   SEMI NESTED LOOPS.                       |     1.   148. 12431 (2) | 00:02:30 |

|*  3 |    HASH JOIN RIGHT SEMI |                       |    49.  5488. 12375 (2) | 00:02:29 |

|   4.     TABLE ACCESS FULL | FCTS_TMS_MBRID_XWLK |  6494 | 64940 |    24 (0) | 00:00:01 |

|*  5 |     TABLE ACCESS FULL | MMR_DTL |   304K |    29 M | 12347 (2) | 00:02:29 |

|*  6 |    TABLE ACCESS BY INDEX ROWID | CRME_FUND_DTL_STG |     1.    36.     5 (0) | 00:00:01 |

|*  7 |     INDEX RANGE SCAN | IE1_CRME_FUND_DTL_STG |     8.       |     1 (0) | 00:00:01 |

-------------------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

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6 filter (("STG_CRME". "FUND_ID" = "1 HAS 80 ' OR 'STG_CRME'." " FUND_ID "="1AA2"OR"

'STG_CRME '. "FUND_ID"= '1AA3' OR 'STG_CRME'. "FUND_ID" = "1 B 80 ' OR 'STG_CRME'. '. "FUND_ID" = "1BA2" OR "

'STG_CRME '. "FUND_ID"= "1BA3" OR "STG_CRME". "FUND_ID"= "AAB1" OR "STG_CRME". ("FUND_ID"="AAB2") AND

'STG_CRME '. "" ERN_FROM_DT "< = INTERNAL_FUNCTION ("MMR_DTL". "PMT_MSA_STRT_DT") AND "

'STG_CRME '. "" ERN_THRU_DT "> = INTERNAL_FUNCTION ("MMR_DTL". "PMT_MSA_STRT_DT")) "

7 - access("STG_CRME".") MBR_CK "=" MMR_DTL. " ("' MBRSHP_CK")

I could not optimize this query for best performance and optimized the cost... Can someone guide me on this.

Thank you

DS

You think you're going to lines updates 85K, Oracle think it will update a line.

At the time where the existence of the first test runs that oracle think already up to 49 lines, which is probably why he uses the loop join nested for the second test. (In your version of Oracle, the subquery introduced existence a very bad assumption (small) on the amount of data will survive).

It is possible that you will get better performance if you hint Oracle using a hash join for testing the existence - and you might want to think what test will eliminate most of the data and that we can first force.

Having said that, however, note that MMR_DTL research is a considerable fraction of the cost of the query - and an analysis is an easy thing for Oracle cost properly - if, despite your comments on update a column with a clue to this topic, you will find that the query can be more effective if you use an index. This is more likely to be the case if data ' WHERE CAPITN_PRCS_IND = 5 AND HSPC_IND = 'Y' "is well grouped (perhaps the latest data added to the table).". "  You could then reduce the cost of maintaining this index by creating an index based on a feature that indexes only the lines where the predicate are both true so that the 2 update deletes the index entries and allows the index remain as thin as possible.

Concerning

Jonathan Lewis

• Try to get your hands on my own pdf courses for performance and tuning 11g, oracle would have a list of the classes that I took?

Tyring to find my own course pdf for oracle performance and tuning that I took through Oracle 11 g.

I am student at 1z0 - 064 currently using 10g perf tuning book.

Oracle would be the list of Oracle classes I've taken.

If Yes, is it possible to get hold of the pdf from the class that I took?

I realize that it is a stretch.

Roger

Roger,

It is a question that you would need to contact the Support University Oracle- Oracle University Contact Information. They should be able to help you.

Kind regards
Brandye Barrington

Oracle Certification program

• The similarity is the performance and tuning 1z1-064 (12 c) the exam 1z0-054 (11g)?

I had Oracle 11 g performance and Tuning of Oracle class.

I wonder how close the 1z1-064 will be the exam 1z0-054.

I'm also a student at the exam 1z1-064.

Is he still released books, or simply the material of the RTO.

Thank you Roger

Oh - and regarding the materials on 1Z0 - 064, there is not yet any material of third parties specific to 1Z0 -054 out right now.  I am sure that there is no output for 064 yet.  I will create a guide for it shortly... I hope that I will be able to complete before the beta and take the exam at the end of the beta.  However, I concentrate on my exams to practice at the moment... so I don't even know if I'll make this deadline.  I certainly will not post before the end of the beta review and probably not until the review of the production is released.

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So @ VMware vCenter Architecture Team is going to make an effort to hear and give due to the much needed performance improvements and improvements to the user interface before adding more features and SSO type services which majority of clients don't use not and not force it's customers continue to loose faith its vCenter product?

Looking for answers with options to remove vCenter 5.5 U1c installation as well as a promise to answer to these in vCenter 6.0 version!

Here is your answer. First of all, to use Chrome as your browser, then you need to go with at least 4vCPU * 32 GB of RAM & adjust the segment size of java for SSO, Tomcat, (TC) Management Server, inventory server and profile based storage to "refine" vCenter device with DB Oracle embedded or external memory. I did, and performance gains went 10 X. This includes the vSAN enabled running clusters. My recommendation that works very well based on design documents:

vCenter Server inventory

VMware VirtualCenter Management Webservices (tc Server)

The inventory service

(Sps) profile-based storage service

Large (more than 400 guests or 4000 VMS) stock

4 GB

12 GB

4 GB

#### Setting on the vCenter server 5.5 of the memory unit

• Connect the unit to vCenter server using SSH
• VI /usr/lib/vmware-vsphere-client/server/wrapper/conf/wrapper.conf configuration file, locate the JVM memory section and change maxmemory to 4096
 Line 66 # Memory #wrapper.java.initmemory = 512wrapper.java.maxmemory = 4096 JVM
• /usr/lib/vmware-vpx/inventoryservice/wrapper/conf/wrapper.conf VI configuration file, find the setting. MaxMemory and replace it with 12288
 Line 116 # Size (in MB) maximum Java heap wrapper.java.maxmemory = 12288
• VI /usr/lib/vmware-vpx/sps/wrapper/conf/wrapper.conf find the setting. MaxMemory and change from 1024 to 4096
 On line 154 # Size (in MB) maximum Java heap wrapper.java.maxmemory = 4096
• Restart the vCenter device w / DB (1000 hosts) external /embedded for lab (100 guests)

http://KB.VMware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=2005086&sliceId=1&docTypeID=DT_KB_1_1&dialogID=294472825&StateID=1%200%20294492358

Documentation Centre of vSphere 5.5

PS: vCenter 6.0 has much better performance based on my beta test... so don't lose hope yet. Many improvements to come...

PS: I've also broken down on this here until I figured this out just recently: Re: big client - vCenter 5.5 response time of the customer Web U1c / questions of Performance and Navigation

• The difference b/w maximum performance and maximum availability

Hello

What is the basic difference b/w maximum performance and maximum availability.
If maximum performance scenarios is used and ensures db stops, changes in the primary db will apply to the next time you start backup db.

Thanx

Hello

If you create a broker - managed DataGuard configuration, you can use
quick start failover (FSFO) for your dataguard.

Concerning

• Comparison of the two bays and change alpha to the array element?

Hello

I continue to work on improving my code ("do more with less"), but ran into a problem.

I try to have some cases become visible when the mouse over other forums (as if the 'campScene.goToAxSign' becomes visible once the mouse is on "campScene.goToAx"). I have two tables; "hoverDetectArray" handles instances "goToX"and "hoverInfoArray" handles instances "goToXSign.

hoverDetectArray = [campScene.goToAx, campScene.goToBridge, campScene.cantGo];

hoverInfoArray = [campScene.goToAxSign, campScene.goToBridgeSign, campScene.cantGoSign];

The event listener constantly listening for any changes.

I have also two functions (although if there is a way to do this with one, please let me know), "SceneHoverInfo" and "SceneHoverInfo2". I am able to do "SceneHoverInfo" works correctly (at least drawing, not my final goal) if I add an event listener for the second function.

public void SceneHoverInfo(event:Event) {}

for (var i: uint = 0; i < hoverDetectArray.length; i ++) {}

If (hoverDetectArray [i] .hitTestPoint (mouseX, mouseY, true)) {}

trace ("cheese");

} else {}

null;

}

}

}

However, I get the error 'term is undefined' if I write this:

If the mouse is hovering

public void SceneHoverInfo(event:Event) {}

for (var i: uint = 0; i < hoverDetectArray.length; i ++) {}

If (hoverDetectArray [i] .hitTestPoint (mouseX, mouseY, true)) {}

} else {}

removeEventListener (Event.ENTER_FRAME, SceneHoverInfoAlso);

}

}

}

sign to view

public void SceneHoverInfoAlso(event:Event) {}

for (var e:uint = 0; e < hoverInfoArray.length; e ++) {}

.Alpha hoverInfoArray [e] = 1;

}

}

I don't know there is something I'm missing, as for the comparison of the two tables. I was hoping somehow the installation program, ' if the mouse is positioned on stationary pointDetectArray [0], castInfoArray [0] to be visible.»

Help is appreciated, as always, and let me know if you need more information.

Geez, sorry, my bad. It was a problem of naming error that I do not. However, I must point out that functions still do not work the way I want. I am only able to do the alpha = 0 if I hover over the first element of hoverDetectArray [i] (although a trace works on all levels to detect three); others don't seem to be listening. I will continue to work on that.

Ned Murphy wrote:

What is the full error message?  Make sure you go in your publication of PFlash settings and select the option to enable debugging so that your error message provides more complete information when possible.

EDIT: Welp, IT solved. The key was simply re-use i like the whole (since both "line up" quite a bit) and not worry a statement 'for' for hoverInfoArray.

public void SceneHoverInfo(event:Event) {}

for (var i: uint = 0; i

If (hoverDetectArray [i] .hitTestPoint (mouseX, mouseY, true)) {}

hoverInfoArray [i] .alpha = 1;

} else {}

hoverInfoArray [i] .alpha = 0;

}

}

}