Details of allocation memory (cRIO vxWorks)

Hello world

A question about memory allocation when dealing with arrays, strings and string array.

-I have to build and produce log files of the ASCII (LAS 2.0) on a cRIO. The cRIO already done tons of other operations and avoiding excessive fragmentation of memory and overall memory usage is an important consideration for us, but CPU is also a limited resource... This new requirement is an addition to "everything" the cRIO already, and I know from experience that manages large data and logging as string files are taxing on the CPU, but also memory, so suggestions are welcome.

Worst?) If I build the file whole by concatenation and set up the content of the file as one long string through one shift-register/ring to another, as it goes, more which I think is the worst possible way to do it from a management perspective of memory.

(Better?) If I build the content of the file line by line and create an array of strings where each element of the array corresponds to a single line, it will be better? As each item is a variable length (String), I don't know how the memory manager manages these tables? Ideally, this is a list of pointers, so that each element (of variable length of the string) is its own segment (contiguous) memory vs all elements in the array in a single contiguous block? If so, that would mean that an array of strings would require nearby less memory than the same data represented as a 1 d of U8 array?

An advantage I can think of the approach of the matrix (or line) is when it is time to write the data in the file, I could write each element of the array individually, once again, the idea is that there should be less overhead to manage the lines individually vs a giant stream on the disk memory? I could then possibly construct/write of the file into blocks so that I'm never content of "whole file" in a row of table...

Better yet? -Anyone have any ideas?

Best? n ' matter who feel that they have completely tamed this beast? Do you want to share?

As a mark of separation, unfortunately, all the data that will eventually be the file do not exist when the file is first created (trace-additional scans are added as soon as they are available throughout the day), and while the raw data itself in the LAS files are in the last section (so new raw data can be just added to the file of string without loading / parsing of the file) , there are some areas in the previous sections that may need to be updated (for example the tag STOP in the ~ section W), I was counting on the manipulation by a number of bytes for the fields that must be updated after the creation of follow-up, but if anyone has experience overview they can share on this subject as well , I am to listen to (in the case otherwise, I'll probably keep these counters in a list of attributes for quick recovery variant and simple because I maintain log files individual person well and therefore need a way a little more organized to follow that just a table or similar).

Like that everyone would just learn to consume newspapers of PDM files we recommend that rather than insisting on all these other formats. :/

(For a similar project (WITSML files), I ended up finding a relatively significant performance gain by building a large part of the ASCI file content as possible from the constant matrix U8, but luxury with this project was so much the structure/content of a static file that it was very, not to mention the WITSML requirement was for a scan/trace by file) , so it was create and forget. It's been a HUGE calculate time and the difference in CPU usage. Not sure this makes a real difference as far as its use/allocation of memory went other than constants of course being constant/charge with the VI and possibly optimizations the compiler as a constant U8 is potentially easier to work with than the strings (and string constants?).)

I am logging the data locally on the disk with my different projects cRIO, because Yes, people just can not and will not use the TDMS files. What I do is I pre-allocate my paintings of strings - for example one the point current data to be logged out of the text file is an array of strings of 1 d, 1 item per channel, I have created by first creating an array of fixed size U8 (INIT 1 d array, say 16 bytes), conversion to string and then initialize my array of strings (INIT 1 d array again).

I keep this saved allocated string of 1 d table change. When it comes time to write a new line to my account, I browse the table, using a loop FOR and Place the item Structure (not), new values in connects.

I do everything with CVT or variables shared so I just read the tags by program and do a 'chain of fractional' on them. To write the string in the file I keep a last number of bytes and simply go to the file position and write.

So far I didn't problems with leaks memory or fragmentation - you see the largest continuous block only decrease and then remain constant. My systems typically run a week to a month between resets.

It sounds like you are already planning to do this: work with arrays of pre-allocated chain. I'd say it's the way to go.

Tags: NI Hardware

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chukarma wrote:

I created VM1 with 1 GB of RAM.

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Subject, I left 0 by default. But under the limit, the default value is unlimited. I would indicate that Unlimited VM1 can use as much memory as it needs and that the ESX host can provide.

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If I set the limit to 2 GB, it does mean that VM1 can use more than 1 GB of RAM configured on built but can use up to 2 GB of RAM?

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From the file pdf resouce management, it appears that once you set the limit, the amount of memory configured on built is ignored, is that correct?

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CPU and memory limits default to unlimited. When the limit of memory is unlimited, the > amount of memory configured for the virtual machine when you create becomes sound > implicit limit in most cases.

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Problem with allocating memory collection arraycollection by AddItem

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------
for (var u: int = 0; u < 41; u ++) {}
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}
-----
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package marcoDoItBetter.utils
{
Import mx.collections.ArrayCollection;
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----
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pageList = mx.collections.ArrayCollection (@105cf341)
[inherited] =
[0] = marcoDoItBetter.utils.PageToSave (@113cb461)
[1] = marcoDoItBetter.utils.PageToSave (@113cb401)
[2] = marcoDoItBetter.utils.PageToSave (@113cb3a1)
[3] = marcoDoItBetter.utils.PageToSave (@113cb341)
[4] = marcoDoItBetter.utils.PageToSave (@113cb2e1)
[5] = marcoDoItBetter.utils.PageToSave (@113cb281) < -.
[6] = marcoDoItBetter.utils.PageToSave (@113cb221)
[7] = marcoDoItBetter.utils.PageToSave (@113cb1c1)
[8] = marcoDoItBetter.utils.PageToSave (@113cb161)
[9] = marcoDoItBetter.utils.PageToSave (@113cb101)
[10] = marcoDoItBetter.utils.PageToSave (@113cb0a1)
[11] = marcoDoItBetter.utils.PageToSave (@113cb041)
[12] = marcoDoItBetter.utils.PageToSave (@1140dfa1)
[13] = marcoDoItBetter.utils.PageToSave (@1140df41)
[14] = marcoDoItBetter.utils.PageToSave (@1140dee1)
[15] = marcoDoItBetter.utils.PageToSave (@1140de81)
[16] = marcoDoItBetter.utils.PageToSave (@1140de21)
[17] = marcoDoItBetter.utils.PageToSave (@1140ddc1)
[18] = marcoDoItBetter.utils.PageToSave (@1140dd61)
[19] = marcoDoItBetter.utils.PageToSave (@1140dd01)
[20] = marcoDoItBetter.utils.PageToSave (@1140dca1)
[21] = marcoDoItBetter.utils.PageToSave (@1140dc41)
[22] = marcoDoItBetter.utils.PageToSave (@113cb281) < -.
[23] = marcoDoItBetter.utils.PageToSave (@1140db81)
[24] = marcoDoItBetter.utils.PageToSave (@1140db21)
[25] = marcoDoItBetter.utils.PageToSave (@1140dac1)
[26] = marcoDoItBetter.utils.PageToSave (@1140da61)
[27] = marcoDoItBetter.utils.PageToSave (@1140da01)
[28] = marcoDoItBetter.utils.PageToSave (@1140d9a1)
[29] = marcoDoItBetter.utils.PageToSave (@1140 d 941)
[30] = marcoDoItBetter.utils.PageToSave (@1140d8e1)
[31] = marcoDoItBetter.utils.PageToSave (@1140 d 881)
[32] = marcoDoItBetter.utils.PageToSave (@1140 d 821)
[33] = marcoDoItBetter.utils.PageToSave (@1140d7c1)
[34] = marcoDoItBetter.utils.PageToSave (@1140 d 761)
[35] = marcoDoItBetter.utils.PageToSave (@1140 d 701)
[36] = marcoDoItBetter.utils.PageToSave (@1140d6a1)
[37] = marcoDoItBetter.utils.PageToSave (@1140 d 641)
[38] = marcoDoItBetter.utils.PageToSave (@1140 d 221)
[39] = marcoDoItBetter.utils.PageToSave (@1140d5e1)
[40] = marcoDoItBetter.utils.PageToSave (@1140 d 461)
source = Array (@1140c9a9)
as you can see the [5] and the [22] PageToSave id internal flex (or instances of the class has the same address listing.
"I don't know the exact name of it). It happens totally randomly.
sometimes fine, sometimes there's more than a duplicate with random address referencing the game.
I don't want duplicated instances, but I want independent authorities.
I tried to change addItem with
This._pages.addItemAt (page, 0);
Same result.
I also tried pagina = null before the statement new but same result
------
for (var u: int = 0; u < 41; u ++) {}
Page = new PageToSave();
project.addPage (page as PageToSave);
Page = null;
}
-----
is a garbage collector from?
How can we solve this problem?
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Hello

From the looks of it, looks like a bug.

Are you defining filters or performs a sort on the ArrayCollection collection? Or it's just a pure naked collection instance ArrayCollection.

Have you tried addItemAt() and got the same result?

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If you find this or any other answer useful please consider awarding points marking the answer correct or useful

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Details of allocation memory (cRIO vxWorks)

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