Litecoin GPU mining on a Mac?

[maxpower]

I managed to get cgminer working on my iMac with a 5670 but the hash rate for LTC is over 100 times slower than BTC.

I think that's normal, right? If you look at the LTC mining hardware comparison, most cards have hash rates in KHs, but if you look at the BTC mining hardware comparison, the same cards have rates measured in MHs. I think that's just due to differences in the two algorithms.

I have a 15-20 performance hit from LTC/FTC under OSX on the exact same hardware even losing system memory to a 32 bit Windows Version. It's not just SHA vs Scrypt hashing.

I believe I mentioned something about a performance hit using opencl on mac vs windows or linux.  I found the thread:

Q: Can I mine with cgminer on a MAC?
A: cgminer will compile on OSX, but the performance of GPU mining is
compromised due to the opencl implementation on OSX, there is no temperature
or fanspeed monitoring, and the cooling design of most MACs, despite having
powerful GPUs, will usually not cope with constant usage leading to a high
risk of thermal damage. It is highly recommended not to mine on a MAC unless
it is to a USB device.

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

Hey, thanks for digging that up. The OpenCL implementation could certainly be the culprit. I guess that's another point in favor of an OS change.

[the1silverwolf]

Hey, thanks for digging that up. The OpenCL implementation could certainly be the culprit. I guess that's another point in favor of an OS change.

Glad I could help.

[joae1975]

I was CPU mining on my iMac, getting about 20 Kh/s.  

Then I decided to try GPU mining.  My terminal window says it's getting 60+ Mh/s, but when I log into my pool website, it says I'm only getting ~14 Kh/s.

I'm also mining on my iphone 5 (for fun) using MobileMiner.  It says I'm getting 0.79 Kh/s and the pool says 3 Kh/s.  

What's the deal?

[maxpower]

I was CPU mining on my iMac, getting about 20 Kh/s.  

Then I decided to try GPU mining.  My terminal window says it's getting 60+ Mh/s, but when I log into my pool website, it says I'm only getting ~14 Kh/s.

I'm also mining on my iphone 5 (for fun) using MobileMiner.  It says I'm getting 0.79 Kh/s and the pool says 3 Kh/s.  

What's the deal?

There doesn't seem to be a direct correlation between hash speed on your system and what the pool reports. For me, it tends to fluctuate depending on how many accepted shares I've sent over the last couple of minutes. I wouldn't worry about the difference.

[joae1975]

I was CPU mining on my iMac, getting about 20 Kh/s.  

Then I decided to try GPU mining.  My terminal window says it's getting 60+ Mh/s, but when I log into my pool website, it says I'm only getting ~14 Kh/s.

I'm also mining on my iphone 5 (for fun) using MobileMiner.  It says I'm getting 0.79 Kh/s and the pool says 3 Kh/s.  

What's the deal?

There doesn't seem to be a direct correlation between hash speed on your system and what the pool reports. For me, it tends to fluctuate depending on how many accepted shares I've sent over the last couple of minutes. I wouldn't worry about the difference.

Thanks, all my shares are being rejected too.  I just started an hr ago.

[maxpower]

I was CPU mining on my iMac, getting about 20 Kh/s.  

Then I decided to try GPU mining.  My terminal window says it's getting 60+ Mh/s, but when I log into my pool website, it says I'm only getting ~14 Kh/s.

I'm also mining on my iphone 5 (for fun) using MobileMiner.  It says I'm getting 0.79 Kh/s and the pool says 3 Kh/s.  

What's the deal?

There doesn't seem to be a direct correlation between hash speed on your system and what the pool reports. For me, it tends to fluctuate depending on how many accepted shares I've sent over the last couple of minutes. I wouldn't worry about the difference.

Thanks, all my shares are being rejected too.  I just started an hr ago.

What are you mining, and what's your cgminer configuration?

[smokeyrd]

I had similar experience with the mac line...really slow and not worth it

[maxpower]

I had similar experience with the mac line...really slow and not worth it

It definitely works better under Boot Camp/Windows 7 for me.

[joae1975]

I was CPU mining on my iMac, getting about 20 Kh/s.  

Then I decided to try GPU mining.  My terminal window says it's getting 60+ Mh/s, but when I log into my pool website, it says I'm only getting ~14 Kh/s.

I'm also mining on my iphone 5 (for fun) using MobileMiner.  It says I'm getting 0.79 Kh/s and the pool says 3 Kh/s.  

What's the deal?

There doesn't seem to be a direct correlation between hash speed on your system and what the pool reports. For me, it tends to fluctuate depending on how many accepted shares I've sent over the last couple of minutes. I wouldn't worry about the difference.

Thanks, all my shares are being rejected too.  I just started an hr ago.

What are you mining, and what's your cgminer configuration?

LTC, I have the intensity at 9, not sure how to tell you what the config is.  Noob here.  My imac is locked down, I'm on my mpb here.  up to 59 Kh/s now on pool.

[maxpower]

I was CPU mining on my iMac, getting about 20 Kh/s.  

Then I decided to try GPU mining.  My terminal window says it's getting 60+ Mh/s, but when I log into my pool website, it says I'm only getting ~14 Kh/s.

I'm also mining on my iphone 5 (for fun) using MobileMiner.  It says I'm getting 0.79 Kh/s and the pool says 3 Kh/s.  

What's the deal?

There doesn't seem to be a direct correlation between hash speed on your system and what the pool reports. For me, it tends to fluctuate depending on how many accepted shares I've sent over the last couple of minutes. I wouldn't worry about the difference.

Thanks, all my shares are being rejected too.  I just started an hr ago.

What are you mining, and what's your cgminer configuration?

LTC, I have the intensity at 9, not sure how to tell you what the config is.  Noob here.  My imac is locked down, I'm on my mpb here.  up to 59 Kh/s now on pool.

Make sure you're passing the "--scrypt" command line option to cgminer if you're mining Litecoins. Otherwise it will try to submit SHA256 shares, which are used for Bitcoin but not Litecoin, and they'll all be rejected.

[joae1975]

Make sure you're passing the "--scrypt" command line option to cgminer if you're mining Litecoins. Otherwise it will try to submit SHA256 shares, which are used for Bitcoin but not Litecoin, and they'll all be rejected.

Oh crap, thanks!  Slowly getting this.  Now I'm at 3Kh, I was better off CPU mining. I'm going to play with the parameters.  Ttyl

Edit: got my info from
blog.nwoolls.com/2013/05/02/litecoin-mining-on-mac-os-x-gpu-mining/