Cosmos: Issues with StreamReader / Writer

Created on 7 Apr 2019 · 16Comments · Source: CosmosOS/Cosmos

I have a performance test program to test how big files can be handled in COSMOS.

This performance test consists of:
Creating a file of 144 x 128 pairs of coordinates 0,0 to 143,127 and writing them in a file line by line.

Reading said coordinates into an array of point objects and then displaying the X and Y values of the points on the screen.

Thing is, the whole test doesn't progress past the reading part.

Why?

It works a bit like this:

The program stalls while writing to the disk , and when I break it and look into the vmdk on VMWare I get the following result:

ScreenShot 142

What I tried was to write the file on my own on windows and then just read the contents of it and display it on the screen.
The problem is that after a certain number of lines, I get garbage on the screen consisting of random characters and the character.

Bug

Source

365Tito

All 16 comments

I think @charlesbetros was working on some fixes for the file system caused by the writing or reading of larger files. The issue might be caused by the bugs.

quajak on 16 Apr 2019

👍1

Can you check if https://github.com/CosmosOS/Cosmos/commit/b9307acfdfa7f92b46093612fac761752763588b changed anything?

quajak on 23 Apr 2019

@quajak I was about to. Will try it out.

365Tito on 24 Apr 2019

@quajak the problem is still there with the latest commit, albeit in a different form. (no garbage chars, just empty ones) video and test file supplied.

https://files.gitter.im/CosmosOS/Cosmos/G3pY/bandicam-2019-05-12-13-12-11-250.avi

https://files.gitter.im/CosmosOS/Cosmos/lcuC/lcet10.txt

365Tito on 12 May 2019

the StreamReader reads approx. 4245 characters before displaying the empty lines.

365Tito on 12 May 2019

Is it possible for you to run the code as a test in testrunner, and enable cosmos debug in a few files so we have some debug log to work off?

quajak on 12 May 2019

Since I don't know how to use the testrunner... Here's the code:

            StreamReader myreader = new StreamReader(@"0:\lcet10.txt");
            int lncount = 0;
            int chrlength = 0;
            while (!myreader.EndOfStream)
            {
                string tmp = myreader.ReadLine();
                chrlength += tmp.ToCharArray().Length;
                Console.WriteLine(tmp);
                lncount++;
                Console.WriteLine("Chr:" + chrlength);
                if(lncount==20)
                {
                    Console.WriteLine("Length: " + chrlength);
                    Console.ReadKey();
                    lncount = 0;
                }
            }

            myreader.Close();

365Tito on 12 May 2019

I'm looking in to this.