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stratix v ethash rate #2140
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stratix v ethash rate #2140
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Former-commit-id: 31e80dca1e5a12e076e070aba82bfd65198ab331
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When it gets new work the farm calls setWork for each GPU’s miners. For an nvidia GPU miner, setWork: - Sets a flag for the miner to stop. The miner will not acknowledge this flag till it completes its current calculation pass, on average half of one hash calculation’s time. - Wait for the miner to stop (blocks). - Reset the miner with new work. This has performance and cost consequences. Since the farm calls setWork sequentially over all miners, a miner will not be stopped and informed of new work, till the previous has completed the reset. It also means that because of this, the laer a miner restarts the more likely to provide a stale share working on old work instead of getting started new work. To mittigate this we break up the setWork process in two parts: setWork and waitReady. setWork - Sets a flag for the miner to stop. waitReady - Wait for the miner to stop (blocks). - Reset the miner with new work. With this partitioning we can now restart the GPUs in parallel by first iterating over miners with setWork (which can’t block), then doing a second pass calling waitReady. Actual measuments - Ubuntu - 4X1060 - time from start of farm setWork to completion of last GPU reset): - Sequential GPU resets – avg. farm setWork time 180-200ms. (yes, it’s that slow!!!) - Parallel GPU resets – avg. farm setWork time 70-90ms. These are averages since, at least for nvidia, switch time is highly dependent on when new work arrives during a hash calculation, so it fluctuates a lot per job. Former-commit-id: 04aef40af3266833713742836d69bd258aa6ff8f
When it gets new work the farm calls setWork for each GPU’s miners. For an nvidia GPU miner, setWork: - Sets a flag for the miner to stop. The miner will not acknowledge this flag till it completes its current calculation pass, on average half of one hash calculation’s time. - Wait for the miner to stop (blocks). - Reset the miner with new work. This has performance and cost consequences. Since the farm calls setWork sequentially over all miners, a miner will not be stopped and informed of new work, till the previous has completed the reset. It also means that because of this, the laer a miner restarts the more likely to provide a stale share working on old work instead of getting started new work. To mittigate this we break up the setWork process in two parts: setWork and waitReady. setWork - Sets a flag for the miner to stop. waitReady - Wait for the miner to stop (blocks). - Reset the miner with new work. With this partitioning we can now restart the GPUs in parallel by first iterating over miners with setWork (which can’t block), then doing a second pass calling waitReady. Actual measuments - Ubuntu - 4X1060 - time from start of farm setWork to completion of last GPU reset): - Sequential GPU resets – avg. farm setWork time 180-200ms. (yes, it’s that slow!!!) - Parallel GPU resets – avg. farm setWork time 70-90ms. These are averages since, at least for nvidia, switch time is highly dependent on when new work arrives during a hash calculation, so it fluctuates a lot per job. Former-commit-id: abe5ab5
Halve the nvidia farm switch time. Former-commit-id: ee3e98aa53b346dee6be82006282ddac609b7805
Halve the nvidia farm switch time. Former-commit-id: 08a458b
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…eptions Catch exceptions from execute() Former-commit-id: 8d95a2ad92ffa1e5dc5831e0949534b9ab51675a
…eptions Catch exceptions from execute() Former-commit-id: b3c18d0
Fix fixes the race condition when the pool thread has a new work package already. The work package is passed along with the nonce now to make sure that the solution reported is valid. Former-commit-id: a706e89bd0297d11d3d8f9b5100e614b4ca8bd02
Fix fixes the race condition when the pool thread has a new work package already. The work package is passed along with the nonce now to make sure that the solution reported is valid. Former-commit-id: 9d01627
…rting CUDAMiner: Pass work package to report() Former-commit-id: d782306250284a46cabf2a6a2bc8c5320a0ab232
…rting CUDAMiner: Pass work package to report() Former-commit-id: 822358d
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Clarify license Former-commit-id: 7d90ed4241b35e51da0c786eb562bbaeea7ecfc6
Clarify license Former-commit-id: d7d14d6
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# Conflicts: # CMakeLists.txt # ethminer/MinerAux.h # ethminer/main.cpp # libethash-cl/CLMiner.cpp # libethash-cl/CLMiner.h # libethcore/CMakeLists.txt # libethcore/Farm.h # libethcore/Miner.h # libstratum/EthStratumClient.cpp # libstratum/EthStratumClient.h # libstratum/EthStratumClientV2.cpp # libstratum/EthStratumClientV2.h # scripts/install-cuda-ubuntu1604.sh # scripts/install_cmake.sh
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fix the stratix v ethash rate，the previous is unbelievable