Posts by Nightwalker
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1) Message boards : News : Collatz Sieve v1.21 released for Windows (Message 21459)
Posted 836 days ago by Nightwalker
For me it did not work with driver 14.12. Only after I upgraded to current driver 15.7.1 the sieve worked.
Are you sure Win7 driver does not work? It has to work with win 2008...

Also I upgraded to VC++ 2012 Update 5 runtime.
2) Message boards : News : Collatz Sieve v1.21 released for Windows (Message 21387)
Posted 842 days ago by Nightwalker
The problem solved. After video driver update sieve is working.
3) Message boards : News : Collatz Sieve v1.21 released for Windows (Message 21386)
Posted 842 days ago by Nightwalker
By the way, for x64 application it's the same.

ModLoad: 000000003f9d0000 0000000000054000 C:\ProgramData\BOINC\projects\boinc.thesonntags.com_collatz\collatz_sieve_1.21_windows_x86_64__opencl_amd_gpu.exe (-nosymbols- Symbols Loaded)
Linked PDB Filename : D:\Source\CollatzSieveV1\x64\Release\collatz_sieve_1.21_windows_x86_64__opencl_nvidia_gpu.pdb


For example,
http://boinc.thesonntags.com/collatz/result.php?resultid=23999050
4) Message boards : News : Collatz Sieve v1.21 released for Windows (Message 21385)
Posted 842 days ago by Nightwalker
My old WUs ended at night. The sieve WUs begun. They all ended with error.

In the morning I saw that and updated VS 2012 runtime. Downloaded new tasks, and again they all ended with error. After that I googled some more and upgraded video driver (video card is AMD Radeon R7 260X).

But now BOINC client does not load Collatz tasks anymore. Am I banned because of errors or what? Will my status be restored with time?

One more question. Let's see any task which ended with error. For example
http://boinc.thesonntags.com/collatz/result.php?resultid=24572822
There are lines
ModLoad: 0000000000150000 000000000004d000 C:\ProgramData\BOINC\projects\boinc.thesonntags.com_collatz\collatz_sieve_1.21_windows_intelx86__opencl_amd_gpu.exe (-nosymbols- Symbols Loaded)
Linked PDB Filename : D:\Source\CollatzSieveV1\Release\collatz_sieve_1.21_windows_intelx86__opencl_nvidia_gpu.pdb

Is it normal that AMD GPU client is linked with Nvidia GPU pdb?
5) Message boards : Number crunching : Optimizing Collatz v6.xx OpenCL and CUDA Applications (Message 18522)
Posted 1437 days ago by Nightwalker
Still, I don't understand how to optimize parameters in config file. With 6.03 and before it, I didn't even know of config file. 6.03 app got 20 minutes to complete WU, cpu utilization was ~20-35%, cpu time ~700 sec, gpu utilization about 100%, gpu temperature ~70 degrees.

My GPU is Radeon R7 260X with 2 Gb RAM.

With 6.04 I've got 48 minutes at first (cpu time ~300 sec). Now, after some tuning, I have 25 minutes per WU, cpu utilization (by the app) 44-49%, cpu time ~1350 sec, gpu utilization 100%, gpu temperature ~73 degrees.

How's that? Higher GPU load (look at the temperature), higher CPU load - and longer processing times?

My current config is

verbose=1
threads=8
items_per_kernel=21
kernels_per_reduction=9
sleep=1
6) Message boards : Number crunching : Optimizing Collatz v6.xx OpenCL and CUDA Applications (Message 18521)
Posted 1437 days ago by Nightwalker
EG, if your AMD machine supports x64 and has 64 bit OS installed, use x86_64. If it has 32 bit OS installed, use x86 app.

About these times. Run time is the time taken by GPU app to complete one WU. CPU time is part of that time, it's the time of CPU used by the app for pumping data/code to GPU and extracting results from it. It is smaller than run time because not all CPU time is used by the app, some of it is used by other applications (or is free/idle).
7) Message boards : Number crunching : OpenCL Errors (Message 18475)
Posted 1439 days ago by Nightwalker
I don't understand what to put in config file. If I place there any settings (it is empty by default), application only becomes slower. At some settings, much slower.

Yes, CPU utilization increased. GPU utilization increased too. But computing time also increased...

My settings now

verbose=1
items_per_kernel=20
kernels_per_reduction=9
threads=8
sleep=1

Video adapter is Radeon R7 260X (2 Gb RAM). What do I change to speedup the application?
8) Message boards : Number crunching : OpenCL Errors (Message 18446)
Posted 1440 days ago by Nightwalker
I have a GPU that displays a checkerboard on any monitor all the time, regardless of the app being run.
No, it is only in Waterfox or Firefox.

I have another question. It is not a bug but...

I noticed that application was updated from 6.03 to 6.04. With 6.03 units were completed for ~1200 sec, now they are ~2400 sec (the score of one unit remains the same, ~7500 points). GPU load dropped from 100% to variable 10-100%. CPU load also dropped, it was ~700 sec per unit, now it is ~300 sec.

I think application was optimized to reduce CPU load. But does it make sense to do it at the cost of overall time? It increased twice. I don't mind if the application uses more CPU if it helps to compute faster.

Are there any options to tune to make the application behave like before?
9) Message boards : Number crunching : OpenCL Errors (Message 18426)
Posted 1441 days ago by Nightwalker

In Firefox, Options, Advanced, General tab, have you tried unchecking the "use hardware acceleration when available"?

What exactly do you mean by glitches? Square boxes if various colors? Words or things where they don't belong?

Yes, small square boxes. In the area of page tabs they are black, in the main window of Firefox they are white.

I disabled hardware acceleration in options, it mostly solved the problem. No more square boxes. Just some font distortion, but it's very rare. Thank you!
10) Message boards : Number crunching : OpenCL Errors (Message 18421)
Posted 1441 days ago by Nightwalker
I have an AMD GPU (Radeon R7 260X). After the last update of Collatz I experience a lot of small graphical glitches in Firefox / Waterfox. There were some glitches before but they were minimal. Now they are all over the upper part of the screen (page tabs, address line, search field etc). The Collatz application is solo_collatz 6.03 (opencl_amd_gpu).

What bothers me is if the GPU computation results are actually valid, with such glitches. Of course I understand it is the bug in Firefox graphics engine (it uses d3d to draw some elements). But I don't understand how it could interfere with Collatz computations.

I updated AMD drivers but it didn't help. Is there any way to fix this?




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