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result mismatch in BFS #20

Open jinz2014 opened 5 years ago

jinz2014 commented 5 years ago

Running the BFS example in OpenCL-U/D shows:

Computed node 2 cost (-2147483647 != 45) does not match the expected value

Thanks

el1goluj commented 5 years ago

Hi jinz2014, Sorry for the delay. Could you please give us more details?

  1. What input graph are you using?
  2. What GPU are you testing on?
  3. Does the error happens for both U and D version? In every run?

Thanks, Juan

jinz2014 commented 5 years ago

Sorry for the late reply. A few things need to be checked:

Some gcc version compiles the application with the following error: g++ -std=c++11 -I/soft/libraries/intel/system_studio_2019/opencl/SDK/include -c -MMD -o main.o main.cpp In file included from /soft/compilers/gcc/7.4.0/linux-rhel7-x86_64/include/c++/7.4.0/bits/move.h:54:0, from /soft/compilers/gcc/7.4.0/linux-rhel7-x86_64/include/c++/7.4.0/atomic:42, from kernel.h:36, from main.cpp:36: /soft/compilers/gcc/7.4.0/linux-rhel7-x86_64/include/c++/7.4.0/type_traits:680:65: error: there are no arguments to ‘is_trivially_copyable’ that depend on a template parameter, so a declaration of ‘is_trivially_copyable’ must be available [-fpermissive] : public integral_constant<bool, __is_trivially_copyable(_Tp)> .... ...

So I switch to intel's compiler, but in Makefile, the following doesn't add the option for Intel C++ compilers.

51 is_pthreads=$(shell ${CXX} -v 2> /dev/stdout | grep "Thread model" | awk {'print $$3'}) 52 ifeq ($(is_pthreads),posix) 53 LIB+=-pthread 54 endif

When I run BFS, I got the following error for OpenCL-D BFS:

$./bfs

Intel(R) Xeon(R) CPU Number of nodes = 264346 Number of edges = 733846 Initialization Time (ms): 241.688000 Allocation Time (ms): 0.118000 Copy To Device Time (ms): 2.828000 Kernel Time (ms): 1.654000 Copy Back and Merge Time (ms): 0.532000 Computed node 2 cost (-2147483647 != 45) does not match the expected value

When I run BFS, I got the following error for OpenCL-U BFS: $./bfs Intel(R) Xeon(R) CPU Allocation Time (ms): 0.043000 Number of nodes = 264346 Number of edges = 733846 Initialization Time (ms): 123.644000 Segmentation fault

el1goluj commented 5 years ago

Hi jinz2014, The Chai benchmarks have not been extensively tested on Intel Xeon CPU as the OpenCL device.