further improved phatk_dia kernel for Phoenix + SDK 2.6 - 2012-01-13

[jedi95]

>I modified the shipping phatk Kernel from Phoenix 1.50. I now get round about 9-10 MHash/s more on my 5830 (up >from 310 to 319/320)!

I would really like to replicate this. Currently getting 310 Mh with 2.1 + 11.5 with bitless Ma() changes. Using the 7-11 I only get a small jump to 311. Can you share the config you use? sdk/driver version etc Thanks.

That might be tough since phatk doesn't work very well on older SDK versions. It was designed to be used with SDK 2.4, and on 2.1 I get better results with poclbm. The Ma() changes also apply to poclbm, so you won't see a gain there.

[1714848209]

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[1714848209]

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[Uzza]

I just did a quick comparison against poclbm for me.

On my dedicated 5870:
poclbm     SDK 2.1: ~424
phatk       SDK 2.1: <420
phatk imp SDK 2.1: ~432

poclbm     SDK 2.4: <424
phatk       SDK 2.4: ~424
phatk imp SDK 2.4: ~437

So on SDK 2.1 your improvements made it so phatk was better than poclbm in 2.1, and way better in 2.4.

The init optimizations gave me a minor boost of ~0.5 MHs over 2011-07-11.

[PcChip]

Uzza, two questions:

1.) what is "phatk imp"

2.) Surely you meant a 5870 instead of a 4870?  Either that or you must have four 4870's to hit 430 MH/s!

[CYPER]

Uzza, two questions:

1.) what is "phatk imp"

2.) Surely you meant a 5870 instead of a 4870?  Either that or you must have four 4870's to hit 430 MH/s!

1 - Phatk Improved - it's what this topic is all about.
2 - Most probably he meant 5870 

[Uzza]

1 - Phatk Improved - it's what this topic is all about.
2 - Most probably he meant 5870 

What this guy said.

[nico_w]

Sadly it only gives me 1Mhash/s increase from 344 to 345 on my server, but keep up the good work!

[MiningBuddy]

Testing the 2011-07-11 kernel.7z

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.1
Before: [428.56 Mhash/sec] -> After: [432.28 Mhash/sec]
Stales before: 0.22% - > Stales after: 3.48%
Over a 4 hour test period

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.4
Before: [422.34 Mhash/sec] -> After: [189.58 Mhash/sec]
Stales: Not tested due to adverse affects.

[Diapolo]

Testing the 2011-07-11 kernel.7z

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.1
Before: [428.56 Mhash/sec] -> After: [432.28 Mhash/sec]
Stales before: 0.22% - > Stales after: 3.48%
Over a 4 hour test period

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.4
Before: [422.34 Mhash/sec] -> After: [189.58 Mhash/sec]
Stales: Not tested due to adverse affects.

Well that is very strange, but at least you are able to mine faster with SDK2.1 and the current kernel version ^^.
Btw. I had other things to do, but during the next week I will release a new version.

Dia

[MiningBuddy]

Testing the 2011-07-11 kernel.7z

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.1
Before: [428.56 Mhash/sec] -> After: [432.28 Mhash/sec]
Stales before: 0.22% - > Stales after: 3.48%
Over a 4 hour test period

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.4
Before: [422.34 Mhash/sec] -> After: [189.58 Mhash/sec]
Stales: Not tested due to adverse affects.

Well that is very strange, but at least you are able to mine faster with SDK2.1 and the current kernel version ^^.
Btw. I had other things to do, but during the next week I will release a new version.

Dia

Awesome, I look forward to it.
I think the rejected shares was random variance from my side as it seems to have settled down to a more realistic 0.88%.

[jedi95]

Testing the 2011-07-11 kernel.7z

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.1
Before: [428.56 Mhash/sec] -> After: [432.28 Mhash/sec]
Stales before: 0.22% - > Stales after: 3.48%
Over a 4 hour test period

XFX 5870 @ 940/300
Ubuntu 11.04, ATI Drivers 11.5, SDK 2.4
Before: [422.34 Mhash/sec] -> After: [189.58 Mhash/sec]
Stales: Not tested due to adverse affects.

Well that is very strange, but at least you are able to mine faster with SDK2.1 and the current kernel version ^^.
Btw. I had other things to do, but during the next week I will release a new version.

Dia

Awesome, I look forward to it.
I think the rejected shares was random variance from my side as it seems to have settled down to a more realistic 0.88%.

Keep in mind that OpenCL kernel changes have NO effect on stale shares (aside from the VERY small difference in time it takes to run 1 execution of some number of hashes) All nonces found by the kernel to satisfy H == 0 are verified on the CPU prior to sending. Shares are also checked against the current known block before sending, in case new work was received while the kernel was executing. Basically this means that every share sent to the server is valid as far as the miner is concerned. If the OpenCL kernel is returning bad work it will never be sent to the server, and instead you will get "Unusual behavior from OpenCL. Hardware problem?"

That said, changes to the python portion of a Phoenix kernel can increase stale shares if badly implemented. (see: FASTLOOP excessive stales with high aggression in older versions of Phoenix)

[zimpixa]

Every new version up to 07~ was faster than previous on both of my rigs. 11~ version however is faster for single 5850, but on 5870+5850 rig Im noticing minor slowdown (due to bigger deltas, means best performance is same, but it can go little lower). In adition primary GPU set '-f0' stopped to bottleneck other GPU (but changing from -f35 to -f0 didnt add any speed). After all tests I've changed version on single gpu rig and left old one on double gpu rig.

[coblee]

Donation sent!

When you release the next version, please explain whats changed in __init__.py.
I'm using fpgaminer's poclbm w/ phatk: http://forum.bitcoin.org/index.php?topic=19169.0
I'd like to see if we can make your phatk kernel still work with that.

Thanks!

[Diapolo]

Important: since version 2011-07-17 a modified version of __init__.py (for the Phoenix 1.5 miner) is included in this package and has to be used!
The kernel won't work for other Miners without modifications to them, see kernel.cl for further infos.


The new version 2011-07-17 is ready for download . Should be faster on 58XX and 69XX cards again.
This version will only work, if you use it with Phoenix and the supplied __init__.py file because of modifications to kernel variables!

A very big thank you goes to user Vince for input and ideas!

Download here:
http://www.mediafire.com/?317u0y93u7mnbys

Have fun,
Dia

[dikidera]

With this version on my 5870: 410.58/411.6 -> 413.44/414Mhash/s

But on my HD5850, i see a decrease of a minimum of 0.50 mhash/s

[CYPER]

2011-07-07 was the best for me so far and with 2011-07-17 I see no improvements - the speed is 1758-1760 as before with the same fluctuations.

4x XFX 5870 @ 960Mhz Core & 300Mhz Memory
Ubuntu 32bit
SDK 2.1
11.5 Drivers

[Peao]

I noticed an improvement in performance.

Thank you, Dia!

[erek]

Solid increase equivalent to nearly 5MHz overclock w/ 2011-07-17

Catalyst 11.7 Early + SDK 2.5


905/340 GPU/VRAM clocks on (2x 6970s)

hitting 812+ MH/sec

[dishwara]

Same hash rate as mod.zip. No "more" hashes.

[bcforum]

I get the same speed with DiabloMiner

[Diapolo]

I get the same speed with DiabloMiner

No need to use Phoenix or this kernel then ...

Dia