ATTN Litecoin GPU Miners - Scrypt support for cgminer

[penek]

I came to the result start from:
--scrypt --worksize 64 --lookup-gap 2 -g 1 --thread-concurrency {number of shaders by card} --intensity 10
and increase "worksize" and multiplying number of shaders in different variants
Edit: may be you have problem with system
Edit 2: try to reinstall (delete and install new) drivers (from amd.com)

--scrypt --worksize 64 --lookup-gap 2 -g 1 --thread-concurrency 1792 --intensity 10  - work = ~60kH/s

with increasing --thread-concurrency = Error -5: Enqueueing kernel onto command queue. (clEnqueueNDRangeKernel)
only whit --thread-concurrency 1792 work but poor

with increasing over --intensity :
on intensity 11 - Accepted 100% at 135kH/s
on intensity 12 - Accepted / Rejected = 50/50 at ~270kH/s  (target-miss)
on intensity 19 - Rejected 100%  at ~490kH/s  (target-miss)

with increasing worksize to 256 with intensity 11, thread-concurrency 1792 lookup-gap 2
Accepted / Rejected = 75 / 25 at 135kH/s  (target-miss)

I've had the same problem in linux.
My problem resolved by export previously specified params
How to do it in windows I don't now, but many of people haven't same problem as your. Try Windows XP x32

[-ck]

I've had the same problem in linux.
My problem resolved by export previously specified params
How to do it in windows I don't now, but many of people haven't same problem same your. Try Windows XP x32

How much ram do you have penek? Yours is a different issue.

[penek]

I've had the same problem in linux.
My problem resolved by export previously specified params
How to do it in windows I don't now, but many of people haven't same problem same your. Try Windows XP x32

How much ram do you have penek? Yours is a different issue.

machine with 2 videocards (6930 and 6870) have 8 Gb
machine with 4 videocards 6770 have 1 Gb

Edit: But cgminer not use many ram (1,1% and 15% of total ram resp.)

P.S. (my bad English)

[-ck]

I've had the same problem in linux.
My problem resolved by export previously specified params
How to do it in windows I don't now, but many of people haven't same problem same your. Try Windows XP x32

How much ram do you have penek? Yours is a different issue.

machine with 2 videocards (6930 and 6870) have 8 Gb
machine with 4 videocards 6770 have 1 Gb

6770 has 1GB of RAM. The 7950 he has has  2GB of ram. Different problem when the GPU has more ram the the system it seems....

[penek]

I've had the same problem in linux.
My problem resolved by export previously specified params
How to do it in windows I don't now, but many of people haven't same problem same your. Try Windows XP x32

How much ram do you have penek? Yours is a different issue.

machine with 2 videocards (6930 and 6870) have 8 Gb
machine with 4 videocards 6770 have 1 Gb

6770 has 1GB of RAM. The 7950 he has has  2GB of ram. Different problem when the GPU has more ram the the system it seems....

I posted my best results in https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison (see 6870 and 6930)

Edit: append my 6770

Edit2: each my card have 1Gb of ram

[Graet]

Scrypt mining has now been merged into the master branch of cgminer, so you can switch to that and from now on it will be in the main release as well.

awesome
Thanks ckolivas

[-ck]

Official release of cgminer with binaries including scrypt support, version 2.6.0, is now available on the cgminer thread:

https://bitcointalk.org/index.php?topic=28402.0

[wndrbr3d]

Deserving of a bump to get this above the drama-rama!

[nitrox]

great new release cgminer 2.6 , but the same problems  ...
now I'm starting to think about does it make sense to buy one more HD7950 eventually, unable to work only one to digging LTC.
will take more RAM for the system tomorrow to see if it has an effect.

meanwhile I saw manual somewhere for ubuntu and cgminer, but I can not find it now

[EskimoBob]

If any of you run 6950, those settings seem to work fine:

Code:

./cgminer --scrypt -o http://xxxxx:9332 -u USER -p PASS --worksize 256 --lookup-gap 2 --thread-concurrency 7040 -g 1 --intensity 19

I get (avg):403.4 Kh/s

I have not fraked with any aticonfig setting.
If you find better options, please post them here.

Cheers and happy LTC mining

[nitrox]

If any of you run 6950, those settings seem to work fine:

Code:

./cgminer --scrypt -o http://xxxxx:9332 -u USER -p PASS --worksize 256 --lookup-gap 2 --thread-concurrency 7040 -g 1 --intensity 19

I get (avg):403.4 Kh/s
I have not fraked with any aticonfig setting.
If you find better options, please post them here.
Cheers and happy LTC mining

i try to run HD7950 , but only a half of HD6950 hashe rate , or cgminer crash , look past 2.3 pages

[EskimoBob]

If any of you run 6950, those settings seem to work fine:

Code:

./cgminer --scrypt -o http://xxxxx:9332 -u USER -p PASS --worksize 256 --lookup-gap 2 --thread-concurrency 7040 -g 1 --intensity 19

I get (avg):403.4 Kh/s
I have not fraked with any aticonfig setting.
If you find better options, please post them here.
Cheers and happy LTC mining

i try to run HD7950 , but only a half of HD6950 hashe rate , or cgminer crash , look past 2.3 pages

did you forget

Code:

export GPU_MAX_ALLOC_PERCENT=100 && ./cgminer --scrypt -o h....

see SCRYPT-README

[nitrox]

did you forget

Code:

export GPU_MAX_ALLOC_PERCENT=100 && ./cgminer --scrypt -o h....

see SCRYPT-README

you not read my post .....
windows 7 x64
Driver 12.6
SDK 2.7

[Bigal]

The latest cgminer 2.6.0 reports the gpus SICK after about a minute or two of mining but appears to hash away just fine and submit shares successfully this is on windows 7 and Ubuntu-12.04

[-ck]

The latest cgminer 2.6.0 reports the gpus SICK after about a minute or two of mining but appears to hash away just fine and submit shares successfully this is on windows 7 and Ubuntu-12.04

Ah fuck a problem of scale. Hashrate will look too low making it think it's sick for scrypt only. I'll fix it tomorrow.

[wndrbr3d]

Ah fuck a problem of scale. Hashrate will look too low making it think it's sick for scrypt only. I'll fix it tomorrow.

Thank you sir for looking into this issue and your effort to date!

[nitrox]

ckolivas,
now i run xubuntu 12.4
cgminer 2.6 with this settings :

--scrypt -I 14 --shaders 1792 -g 1

it run normal , if i increase intensity start rejecting,
but a hash rate i think is little be low >260kH/s

edit:
come one mining linux guru how to increase hashe rate ?

[Bigal]

ckolivas,
now i run xubuntu 12.4
cgminer 2.6 with this settings :

--scrypt -I 14 --shaders 1792 -g 1

it run normal , if i increase intensity start rejecting,
but a hash rate i think is little be low >260kH/s

Did you run
export GPU_MAX_ALLOC_PERCENT=100
before running cgminer under Ubuntu?

What are you stock clock rates? Maybe try experimenting there a little with engine and memory clocks upwards and downwards, the hash rates can vary quite a bit depending on the ratio of engine to memory

[Greedi]

did you forget

Code:

export GPU_MAX_ALLOC_PERCENT=100 && ./cgminer --scrypt -o h....

see SCRYPT-README

you not read my post .....
windows 7 x64
Driver 12.6
SDK 2.7

you have not readed either, some cards can not go over -I 13 !

[nitrox]

Did you run
export GPU_MAX_ALLOC_PERCENT=100
before running cgminer under Ubuntu?
What are you stock clock rates? Maybe try experimenting there a little with engine and memory clocks upwards and downwards, the hash rates can vary quite a bit depending on the ratio of engine to memory

export GPU_MAX_ALLOC_PERCENT=100 - YES I RUN IT

GPU : 1045Mhz (default : 900MHz)
RAM : 1450MHz (default : 1250MHz)