請求啓動

CUDA太多的資源我跑我的代碼在GTX 480與計算能力的一些問題2.0請求啓動

我總是得到以下錯誤，如果我進入內核，每塊1024個主題：

========= CUDA-MEMCHECK 
========= Program hit cudaErrorLaunchOutOfResources (error 7) due to "too many resources requested for launch" on CUDA API call to cudaLaunch. 
=========  Saved host backtrace up to driver entry point at error 
=========  Host Frame:/usr/lib/x86_64-linux-gnu/libcuda.so.1 [0x2ef613] 
=========  Host Frame:/usr/local/cuda-6.5/lib64/libcudart.so.6.5 (cudaLaunch + 0x17e) [0x3686e] 
=========  Host Frame:./bin/myProgram [0x3a50] 
=========  Host Frame:./bin/myProgram [0x388a] 
=========  Host Frame:./bin/myProgram [0x38e3] 
=========  Host Frame:./bin/myProgram [0x2a99] 
=========  Host Frame:./bin/myProgram [0x1410] 
=========  Host Frame:./bin/myProgram [0x1da0] 
=========  Host Frame:/lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main + 0xed) [0x2176d] 
=========  Host Frame:./bin/myProgram [0x1139] 
=========

我運行程序多時間，不同的塊和線程數：

5 Blocks, 512 Threads per Block => Works 
5 Blocks, 1024 Threads per Block => Error 
10 Blocks, 512 Threads per Block => Works 
10 Blocks, 1024 Threads per Block => Error 
15 Blocks, 512 Threads per Block => Works 
15 Blocks, 1024 Threads per Block => Error

我檢查了使用的寄存器，它似乎是確定。帶有28個寄存器的「Function4」是使用這麼多線程的內核。所有其他內核只使用< < < 1,328次/每次調用。

ptxas info : 0 bytes gmem 
ptxas info : Function properties for _Z7function1Py 
    0 bytes stack frame, 0 bytes spill stores, 0 bytes spill loads 
ptxas info : Compiling entry function '_Z13function2PyS_i' for 'sm_20' 
ptxas info : Function properties for _Z13function2PyS_i 
    0 bytes stack frame, 0 bytes spill stores, 0 bytes spill loads 
ptxas info : Used 22 registers, 52 bytes cmem[0] 
ptxas info : Compiling entry function '_Z6function3PyiS_' for 'sm_20' 
ptxas info : Function properties for _Z6function3PyiS_ 
    0 bytes stack frame, 0 bytes spill stores, 0 bytes spill loads 
ptxas info : Used 22 registers, 56 bytes cmem[0] 
ptxas info : Compiling entry function '_Z17function4PyiiS_Phji' for 'sm_20' 
ptxas info : Function properties for _Z17function4PyiiS_Phji 
    0 bytes stack frame, 0 bytes spill stores, 0 bytes spill loads 
ptxas info : Used 28 registers, 72 bytes cmem[0]

我用CC 3.0運行這個程序，我的GTX 660也有CC 3.0，它的工作方式是每塊1024線程。我不知道問題來自何處。有沒有人有想法？

來源

2014-10-05 Burak

它可能是一個註冊每線程問題。嘗試用'-maxrregcount 28'（或'24'）編譯代碼，看看它是否會影響失敗的案例。 – 2014-12-01 09:51:34