Bitcoin Forum
December 06, 2016, 10:11:05 PM *
News: Latest stable version of Bitcoin Core: 0.13.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: How I got multi-GPU Mining without CPU bug on windows (5xxx series)  (Read 3630 times)
ssateneth
Legendary
*
Offline Offline

Activity: 1288



View Profile
January 27, 2012, 03:35:52 AM
 #1

TL;DR at the end + picture of multi GPU mining with no cpu bug.

So like many other people grinding their teeth on how their cpu pegs to 100% while mining, I had gotten this too on all my rigs. At first, it was -all- my miners, including single GPU setups. I had heard of 2.1 SDK not having a CPU bug but couldn't figure out how to get it to work with GUIMiner frontend as well as newer Phoenix miners, since it would always complain that no OpenCL devices are installed. I thought maybe it had something to do with how SDK 2.1 installs itself in C:\Program Files (x86)\ATI Stream. All AMD GPGPU applications from 2.4 onward install into C:\Windows\System32 and C:\Windows\SysWOW64. Maybe GUIMiner/Phoenix look in those directories instead to find OpenCL files? Not sure, but likely. In any case, SDK speeds vary for the 5xxx series in that 2.1 > 2.4 = 2.5 > 2.6. If you use all 5xxx series cards, you're in luck.

First instances where I saw CPU bug was gone started in 11.11 driver and 2.1/2.5 SDK (Untested 2.4 and 2.6, but likely no bug there too), but this only seemed to apply to single GPU setups. Also, how "intense" your miner ran seemed to cause the CPU bug to arise again, so I was stuck with 11.11 + 2.5 SDK + mid-high aggression on single GPU rigs (10 aggression on phoenix seemed to be the max. 11 would get 40% and 12 would get 80-100%). I ran this for a while and decided to suck up the CPU bug on my multi GPU rig.

Then I started playing around with 2.1 again, but forgot to uninstall 2.5 off my system once, and found that GUIMiner no longer complained about no OpenCL devices! I also had access to -2- OpenCL platforms, because they were installed in seperate locations. I found that 2.1 SDK had a small edge against 2.5 as far as speed goes while using the same phatk 2.2 kernel, gaining about 0.5% more mhash. But I also found 2.1 was -very- aggressive, causing the mouse to lag, and even causing TDR to trigger (read about TDR at http://msdn.microsoft.com/en-us/windows/hardware/gg487368) at the aggression of 14 I normally mined with 2.5, so I bumped it down to 12 and found it no longer crashed the driver. I also found at even such high aggressions, there was an absolutely negligible amount of cpu time being consumed by Phoenix.exe!

I went about trying this for my multi-GPU miner using 11.11 driver + 2.1/2.5 SDK combo, but I had horrible problems with what could have been power issues, bad scheduling, I don't know. While 11.11 + 2.5 retained 99% GPU usage, it had a CPU bug. Once I tried out 2.1 though, GPU usage varied anywhere from 70% to 98%. I also had wildly fluctuating power draw at the wall, commonly going over what it normally drew with 2.5, and causing the entire pc to crash, so rolled back for a while, though now I had found a way to reduce processor frequency inside windows from 3.00 GHz to a meager 800MHz inside one of windows advanced power options.

Ran this for about a month before coming across https://bitcointalk.org/index.php?topic=56740 and someone mentioned their "golden combo" of 11.12 + 2.5. I tried it to no avail, but on a whim, I went about trying 2.1 again, and lo and behold, no cpu bug and 99% GPU activity!

TL;DR: If you're running 5xxx series cards, 2.1 SDK + 11.12 (or greater) driver seem to not exhibit any cpu bug across multi-GPU setups when running Windows 7. If you use GUIMiner, install another sdk alongside of 2.1 in order to get the frontend to recognize your devices (I use 2.5). If you need a better explanation, just post in thread. Here's a pic of my 4-GPU rig mining away with no CPU bug, and yes, those GPU temperatures are correct; the entire PC sits outside.

Specific OS/driver/miner/whatever settings: Windows 7 x64 Ultimate, Driver 11.12, SDK 2.1 + 2.5, GUIMiner frontend, Phoenix 1.7.4 using only the 2.1 SDK mining at Eligius using phatk 2.2 kernel with the Extra Flags box filled with "-k phatk2 VECTORS AGGRESSION=12" without quotes. Phatk 2.2 automatically assumes BFI_INT and maximum worksize supported by the device (256) so these are not supplied into the arguments. Hardware used is 2x5870 @ 1000core/330 memory, 1x5830 @ 1000/330 and 1x 5830 @ 1024/330. I ran a before and after between 2.5 and 2.1 (AGGRESSION=14 for 2.5, everything else is the same) and got these hash numbers. 2.1 SDK seems to have a 0.1% speed increase over 2.5 SDK

Before       ||||||        After
463.0 (1000core/5870) 462.7
463.4 (1000core/5870) 462.7
324.5 (1000core/5830) 324.8
330.9 (1025core/5830) 332.9
2.5 sdk                    2.1 sdk
1581.4 mhash | 1583.1 mhash

Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1481062265
Hero Member
*
Offline Offline

Posts: 1481062265

View Profile Personal Message (Offline)

Ignore
1481062265
Reply with quote  #2

1481062265
Report to moderator
1481062265
Hero Member
*
Offline Offline

Posts: 1481062265

View Profile Personal Message (Offline)

Ignore
1481062265
Reply with quote  #2

1481062265
Report to moderator
OggerMC
Member
**
Offline Offline

Activity: 93


View Profile
March 19, 2012, 06:25:37 PM
 #2

does that mean i can use the newest driver and only have to change the SDK's to get the "bug fix"?
im using my main pc, for games and mining, so i need new drivers for games like BF3 and such.

could you make a step by step guide? cuz its kinda confusing, i havend done much with sdk yet, and been using gui miners since i started mining.
Beaflag VonRathburg
Sr. Member
****
Offline Offline

Activity: 472



View Profile
March 19, 2012, 09:54:35 PM
 #3

does that mean i can use the newest driver and only have to change the SDK's to get the "bug fix"?
im using my main pc, for games and mining, so i need new drivers for games like BF3 and such.

could you make a step by step guide? cuz its kinda confusing, i havend done much with sdk yet, and been using gui miners since i started mining.

I went through this last night after my 6870x2 and Ubuntu refusing to cooperate. I'm in a similar boat and was running catalyst 12.1. I did a complete driver removal and rebooted. I installed in this order:

11.12 catalyst
SDK2.1
CGMiner 2.3.1
Sapphire Trixx

For some odd reason I was having major issues the first time I tried to install SDK2.1. I don't know why, but it just didn't want to work with GUIMiner. 11.12 has it's own SDK package that you can see if you select to custom install. That SDK and SDK2.1 install in different directories as mentioned above. There are no CPU bugs and I am not using dummy plugs. My 5870 at 975/170 1.100V hashes steady at 440. My two 4x5870 linux rigs that run 11.6 and SDK2.4 hash slightly lower around 425-430, but I believe there is another issue. The 6870x2 and 6870 also in the system are proving to be a pain in the ass, but at least it is working.

OggerMC
Member
**
Offline Offline

Activity: 93


View Profile
April 16, 2012, 12:28:18 PM
 #4

does that mean i can use the newest driver and only have to change the SDK's to get the "bug fix"?
im using my main pc, for games and mining, so i need new drivers for games like BF3 and such.

could you make a step by step guide? cuz its kinda confusing, i havend done much with sdk yet, and been using gui miners since i started mining.

I went through this last night after my 6870x2 and Ubuntu refusing to cooperate. I'm in a similar boat and was running catalyst 12.1. I did a complete driver removal and rebooted. I installed in this order:

11.12 catalyst
SDK2.1
CGMiner 2.3.1
Sapphire Trixx

For some odd reason I was having major issues the first time I tried to install SDK2.1. I don't know why, but it just didn't want to work with GUIMiner. 11.12 has it's own SDK package that you can see if you select to custom install. That SDK and SDK2.1 install in different directories as mentioned above. There are no CPU bugs and I am not using dummy plugs. My 5870 at 975/170 1.100V hashes steady at 440. My two 4x5870 linux rigs that run 11.6 and SDK2.4 hash slightly lower around 425-430, but I believe there is another issue. The 6870x2 and 6870 also in the system are proving to be a pain in the ass, but at least it is working.

So, which SDK is being used? the one which comes with the 11.12 driver or the 2.1?

Edit: i just now installed the new SDK 2.6 and my 7870 and 5850 are working without 100 % cpu bug!
ssateneth
Legendary
*
Offline Offline

Activity: 1288



View Profile
April 17, 2012, 10:02:06 AM
 #5

does that mean i can use the newest driver and only have to change the SDK's to get the "bug fix"?
im using my main pc, for games and mining, so i need new drivers for games like BF3 and such.

could you make a step by step guide? cuz its kinda confusing, i havend done much with sdk yet, and been using gui miners since i started mining.

I went through this last night after my 6870x2 and Ubuntu refusing to cooperate. I'm in a similar boat and was running catalyst 12.1. I did a complete driver removal and rebooted. I installed in this order:

11.12 catalyst
SDK2.1
CGMiner 2.3.1
Sapphire Trixx

For some odd reason I was having major issues the first time I tried to install SDK2.1. I don't know why, but it just didn't want to work with GUIMiner. 11.12 has it's own SDK package that you can see if you select to custom install. That SDK and SDK2.1 install in different directories as mentioned above. There are no CPU bugs and I am not using dummy plugs. My 5870 at 975/170 1.100V hashes steady at 440. My two 4x5870 linux rigs that run 11.6 and SDK2.4 hash slightly lower around 425-430, but I believe there is another issue. The 6870x2 and 6870 also in the system are proving to be a pain in the ass, but at least it is working.

So, which SDK is being used? the one which comes with the 11.12 driver or the 2.1?

Edit: i just now installed the new SDK 2.6 and my 7870 and 5850 are working without 100 % cpu bug!


I actually mine on 2.1 SDK with 5870 and 5830's, but the 2.6 SDK is required in order for some miners to see the faster 2.1 SDK (2.1 SDK will NOT work with your 7970, but you can mine on 2 different cards using 2 different SDKs at the same time. just configure your miners appropriately)

Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!