ATTN Litecoin GPU Miners - Scrypt support for cgminer

[-ck]

Okay I've experimented some more and
export GPU_MAX_ALLOC_PERCENT=100
will obviously cause a problem, but it gives me massive scope for trying different tc, etc since I can theoretically allocate 3GB on a 7970. However the code would try to allocate the largest buffer by default which is not right with this value now, so I've committed a change (to git) that will find the nearest buffer size that is a power of 2 between the thread concurrency buffer requirement and the maximum allocable ram.

Playing some more with my 7970s I found the values it was already running were pretty close to optimal. The only thing I found useful with the increased ram available was that I am now able to increase threads a little more (5 instead of 4) which afforded another 5kh per device.

The good news is that this should be what the 5x/6x miners were looking for on linux. I suggest you download the latest changes from git and start experimenting with TCs that are a multiple of your shader count after setting the above variable to 100%.

Wow - I am leaving work and was planning to try the parameter at home - and now I see that you already did my homework :-)


many thanks !!!

To say the lack of progress on scrypt performance is bugging me would be an understatement in the extreme. Thank you for spotting this, but I fear even this is not the holy grail. Goddamn witchcraft....

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[dellech]

...

The good news is that this should be what the 5x/6x miners were looking for on linux. I suggest you download the latest changes from git and start experimenting with TCs that are a multiple of your shader count after setting the above variable to 100%.

Wow - I am leaving work and was planning to try the parameter at home - and now I see that you already did my homework :-)


many thanks !!!

To say the lack of progress on scrypt performance is bugging me would be an understatement in the extreme. Thank you for spotting this, but I fear even this is not the holy grail. Goddamn witchcraft....

I am excited !
git pull - make - start with the export and -D -T

 [2012-07-25 17:28:35] CL Platform vendor: Advanced Micro Devices, Inc.                   
 [2012-07-25 17:28:35] CL Platform name: AMD Accelerated Parallel Processing                   
 [2012-07-25 17:28:35] CL Platform version: OpenCL 1.2 AMD-APP (938.1)                   
 [2012-07-25 17:28:35] List of devices:                   
 [2012-07-25 17:28:35]  0       Cypress                   
 [2012-07-25 17:28:35] Selected 0: Cypress                   
 [2012-07-25 17:28:35] Long-polling activated for http://p2p:9327/long-polling                   
 [2012-07-25 17:28:35] Preferred vector width reported 4                   
 [2012-07-25 17:28:35] Max work group size reported 256                   
 [2012-07-25 17:28:35] Max mem alloc size is 536870912                   
 [2012-07-25 17:28:35] Selecting scrypt kernel                   
 [2012-07-25 17:28:35] GPU 0: selecting lookup gap of 2                   
 [2012-07-25 17:28:35] GPU 0: selecting thread concurrency of 7200                   
 [2012-07-25 17:28:35] No binary found, generating from source                   
 [2012-07-25 17:28:35] Setting worksize to 256                   
 [2012-07-25 17:28:35] cl_amd_media_ops found, setting BITALIGN                   
 [2012-07-25 17:28:35] BFI_INT patch requiring device found, patched source with BFI_INT                   
 [2012-07-25 17:28:35] CompilerOptions: -D LOOKUP_GAP=2 -D CONCURRENT_THREADS=7200 -D WORKSIZE=256 -D BITALIGN -D BFI_INT -D GOFFSET                   
 [2012-07-25 17:28:38] X-Roll-Ntime expiry set to 10

cgminer crashed but restarting with -g 1 lets it hash away with about 260 kH/s :-)


ATM it runs with
DISPLAY=:0 GPU_MAX_ALLOC_PERCENT=100 ../cgminerltc/cgminer -o http://p2p:9327 -u x -p y --scrypt --shaders 1440 -I 15 -g 1 --auto-fan --auto-gpu --gpu-engine 600-900 --gpu-memclock 1000 --temp-cutoff 85 --gpu-fan 20-70 --temp-overheat 75 --temp-target 65

-I 15 seems to be the sweet spot, only 3 kH/s less than -I 16  but 0.x% rejects instead of >10%


Thanks again !   ... and I may later try lower tc with -g 2 and expermient more :-)

[grimd34th]

Image:

only get ~20 kh/s

Code:

cgminer --scrypt -I 16 --shaders 800

[Bigal]

I am excited !
git pull - make - start with the export and -D -T

 [2012-07-25 17:28:35] CL Platform vendor: Advanced Micro Devices, Inc.                    
 [2012-07-25 17:28:35] CL Platform name: AMD Accelerated Parallel Processing                    
 [2012-07-25 17:28:35] CL Platform version: OpenCL 1.2 AMD-APP (938.1)                    
 [2012-07-25 17:28:35] List of devices:                    
 [2012-07-25 17:28:35]  0       Cypress                    
 [2012-07-25 17:28:35] Selected 0: Cypress                    
 [2012-07-25 17:28:35] Long-polling activated for http://p2p:9327/long-polling                    
 [2012-07-25 17:28:35] Preferred vector width reported 4                    
 [2012-07-25 17:28:35] Max work group size reported 256                    
 [2012-07-25 17:28:35] Max mem alloc size is 536870912                    
 [2012-07-25 17:28:35] Selecting scrypt kernel                    
 [2012-07-25 17:28:35] GPU 0: selecting lookup gap of 2                    
 [2012-07-25 17:28:35] GPU 0: selecting thread concurrency of 7200                    
 [2012-07-25 17:28:35] No binary found, generating from source                    
 [2012-07-25 17:28:35] Setting worksize to 256                    
 [2012-07-25 17:28:35] cl_amd_media_ops found, setting BITALIGN                    
 [2012-07-25 17:28:35] BFI_INT patch requiring device found, patched source with BFI_INT                    
 [2012-07-25 17:28:35] CompilerOptions: -D LOOKUP_GAP=2 -D CONCURRENT_THREADS=7200 -D WORKSIZE=256 -D BITALIGN -D BFI_INT -D GOFFSET                    
 [2012-07-25 17:28:38] X-Roll-Ntime expiry set to 10

cgminer crashed but restarting with -g 1 lets it hash away with about 260 kH/s :-)


ATM it runs with
DISPLAY=:0 GPU_MAX_ALLOC_PERCENT=100 ../cgminerltc/cgminer -o http://p2p:9327 -u x -p y --scrypt --shaders 1440 -I 15 -g 1 --auto-fan --auto-gpu --gpu-engine 600-900 --gpu-memclock 1000 --temp-cutoff 85 --gpu-fan 20-70 --temp-overheat 75 --temp-target 65

-I 15 seems to be the sweet spot, only 3 kH/s less than -I 16  but 0.x% rejects instead of >10%


Thanks again !   ... and I may later try lower tc with -g 2 and expermient more :-)

Brilliant! that did the trick, don't know why I didn't try -g 1 before or did try it and something else was out of whack.

Still can only set the tc to a maximum of 4096 under ubuntu 12.04 (2048 for g 2 ) but now the intensity can go up to 12 without errors and the speed is nearly identical to reaper @ 1003 kh  

tc-4096  w-256  g-1  I-12

Edit: looks like tc 7200 works the best on a 5850

[Bigal]

I need some help to compile CGMiner with Scrypt under Ubuntu 12.04 64 bits, 1 7970, Catalyst 12.6, AMDAPP v2.6...

What is the procedure?

Basically: git clone, checkout newscrypt, autogen, configure --enable-scrypt ... ?

Thanks!
Thiago

adl files in the adl-sdk folder

./autogen.sh
CFLAGS="-O2 -Wall -march=native -I/opt/AMDAPP/include" LDFLAGS="L/opt/AMDAPP/lib/x86_64" ./configure --enable-scrypt
make

[-ck]

Image:

only get ~20 kh/s

Code:

cgminer --scrypt -I 16 --shaders 800

You'll have to fine tune it with thread concurrency, shaders alone still doesn't cut it. I haven't found the optimum autotune as of yet, and I'm not sure there will be one.

[forsetifox]

Thanks for your work on this Conman. =3 And thanks for the people that donated to him.

Here's where I am right now. It will mine on the Nvidia fine it seems but the ATI GPU isn't working correctly.
I'm using the 12.4 catalyst with the 2.7 SDK for the ATI GPU. I could not find a working DL link for the 2.6 SDK.



This is what "cgminer -n" says.



I've got one monitor hooked up to the first GPU (Nvidia). I've tried the gpu-map option and cannot get it to work correctly. I suspect windows thinks both adapters are hooked up to the monitor. >.>

[-ck]

Use --gpu-platform 1 for your AMD device.

[forsetifox]

Code:

cgminer.exe -o http://litecoinpool.org:9332 -u username -p password --intensity 4 --scrypt --shaders 800 --gpu-platform 1

Same result as before.

[-ck]

Code:

cgminer.exe -o http://litecoinpool.org:9332 -u username -p password --intensity 4 --scrypt --shaders 800 --gpu-platform 1

Same result as before.

You will still need to read up about the gpu map. However you wont be able to mine on the AMD device and the NVIDIA device from the same cgminer instance regardless; you must choose one platform for each instance of cgminer.

[forsetifox]

I don't want to mine on the Nvidia adapter I want to mine on the ATI adapter. CGminer wants to mine on the Nvidia adapter. The platform switch doesn't seem to do anything.

From what I see ..

[2012-07-25 17:49:35] Platform 0 devices: 1
[2012-07-25 17:49:35]  0       GeForce GTX 460
[2012-07-25 17:49:35] Platform 1 devices: 1
[2012-07-25 17:49:35]  0       Juniper

They both say "0". That isn't covered in your README that I see so the gpu-map command won't work?

[-ck]

I don't want to mine on the Nvidia adapter I want to mine on the ATI adapter. CGminer wants to mine on the Nvidia adapter. The platform switch doesn't seem to do anything.

That does not compute. It should... 

[forsetifox]

Making some headway. Deleted the Nvidia OpenCL files and now I'm getting a "scrypt120724Juniperglg2tc8000w256l4.bin" being created in the cgminer folder. However still the same errors and hash rate.

[-ck]

Making some headway. Deleted the Nvidia OpenCL files and now I'm getting a "scrypt120724Juniperglg2tc8000w256l4.bin" being created in the cgminer folder. However still the same errors and hash rate.

Now time to fiddle with the thread concurrency manually. Suggest 3200 or other multiples of 800.

[forsetifox]

It's working now.

5770 850/1200, catalyst 12.4, SDK 2.7

Code:

cgminer.exe -o http://litecoinpool.org:9332 -u username -p password --in
tensity 18 --scrypt --shaders 800 --gpu-platform 1 --thread-concurrency 4000 --w
orksize 256

[Cranky4u]

It's working now.

5770 850/1200, catalyst 12.4, SDK 2.7

Code:

cgminer.exe -o http://litecoinpool.org:9332 -u username -p password --in
tensity 18 --scrypt --shaders 800 --gpu-platform 1 --thread-concurrency 4000 --w
orksize 256

Is this on Win 7 or Linux?

Interested as I have 2*6770s just sitting around on a win7 doing nothing...pulled from my win 7 + 2* FPGA machine so I can run dedicated BTC and LTC machines

[Greedi]

It's working now.

5770 850/1200, catalyst 12.4, SDK 2.7

Code:

cgminer.exe -o http://litecoinpool.org:9332 -u username -p password --in
tensity 18 --scrypt --shaders 800 --gpu-platform 1 --thread-concurrency 4000 --w
orksize 256

Is this on Win 7 or Linux?

Interested as I have 2*6770s just sitting around on a win7 doing nothing...pulled from my win 7 + 2* FPGA machine so I can run dedicated BTC and LTC machines

I'm mining on 2*6770 on win 7.. here is my info i use to get the best.. 215 kh/s from both..

Code:

cgminer --scrypt -o http://litecoinpool.org:9332 -u username -p pass  --shaders 1536 -I 18 -g 1

[forsetifox]

It's Windows 7 64 bit.

[Greedi]

It's Windows 7 64 bit.

also here

[Tittiez]

I'm working on an idiots guide to setting up cgminer. Stay tuned.