Problems with parallel_for

brtaylor92 — Sun, 25 Sep 2011 03:02:38 GMT

I'm trying to learn how to use the parallel_for() function described in this link. . To do so, I wrote a simple program that prints "Hello World!" to the terminal 5 times using a loop. It looks like:



#include  

#include "tbb/parallel_for.h" 

#include "tbb/blocked_range.h" 



using namespace tbb;



struct Hello { 

    void operator() ( const blocked_range& range ) const { 

        for (int i=range.begin(); i!=range.end(); i++) 

            std::cout << "Hello World!" << std::endl; 

       }

}; 



int main () 

{   

    int i=0; 

    Hello hi; 

    parallel_for( blocked_range(0, i, 5), hi); 

    return 0; 

}

When I compile it with icpc hello.cpp I get:

Undefined symbols for architecture x86_64:
  "__ZNK3tbb8internal32allocate_root_with_context_proxy4freeERNS_4taskE", referenced from:
      __ZdlPvRKN3tbb8internal32allocate_root_with_context_proxyE in icpcFImXZe.o
  "__ZNK3tbb8internal27allocate_continuation_proxy8allocateEm", referenced from:
      __ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_ in icpcFImXZe.o
  "__ZNK3tbb8internal20allocate_child_proxy8allocateEm", referenced from:
      __ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_ in icpcFImXZe.o
  "__ZNK3tbb18task_group_context28is_group_execution_cancelledEv", referenced from:
      __ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_ in icpcFImXZe.o
  "__ZNK3tbb8internal27allocate_continuation_proxy4freeERNS_4taskE", referenced from:
      __ZdlPvRKN3tbb8internal27allocate_continuation_proxyE in icpcFImXZe.o
  "__ZNK3tbb8internal20allocate_child_proxy4freeERNS_4taskE", referenced from:
      __ZdlPvRKN3tbb8internal20allocate_child_proxyE in icpcFImXZe.o
  "__ZN3tbb4task13note_affinityEt", referenced from:
      __ZTVN3tbb10interface68internal9flag_taskE in icpcFImXZe.o
      __ZTVN3tbb10interface68internal11signal_taskE in icpcFImXZe.o
  "__ZTIN3tbb4taskE", referenced from:
      __ZTIN3tbb10interface68internal9flag_taskE in icpcFImXZe.o
      __ZTIN3tbb10interface68internal11signal_taskE in icpcFImXZe.o
      __ZTIN3tbb10interface68internal9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEE in icpcFImXZe.o
ld: symbol(s) not found for architecture x86_64

Or, on another system (gentoo rather than OS X),


/tmp/icpcFDqPZs.o: In function `operator delete(void*, tbb::internal::allocate_root_with_context_proxy const&)':
hello.cpp:(.text._ZdlPvRKN3tbb8internal32allocate_root_with_context_proxyE[.text._ZdlPvRKN3tbb8internal32allocate_root_with_context_proxyE]+0xb): undefined reference to `tbb::internal::allocate_root_with_context_proxy::free(tbb::task&) const'
/tmp/icpcFDqPZs.o: In function `.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_':
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x1be): undefined reference to `tbb::internal::allocate_continuation_proxy::allocate(unsigned long) const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x1f0): undefined reference to `tbb::internal::allocate_child_proxy::allocate(unsigned long) const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x2c1): undefined reference to `tbb::task_group_context::is_group_execution_cancelled() const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x3a8): undefined reference to `tbb::internal::allocate_continuation_proxy::allocate(unsigned long) const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x3e3): undefined reference to `tbb::internal::allocate_child_proxy::allocate(unsigned long) const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x4cb): undefined reference to `tbb::internal::allocate_continuation_proxy::allocate(unsigned long) const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x502): undefined reference to `tbb::internal::allocate_child_proxy::allocate(unsigned long) const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x5ac): undefined reference to `tbb::internal::allocate_continuation_proxy::allocate(unsigned long) const'
hello.cpp:(.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_[.text._ZN3tbb10interface68internal19partition_type_baseINS1_19auto_partition_typeEE7executeINS1_9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEES8_EEvRT_RT0_]+0x5e7): undefined reference to `tbb::internal::allocate_child_proxy::allocate(unsigned long) const'
/tmp/icpcFDqPZs.o: In function `operator delete(void*, tbb::internal::allocate_continuation_proxy const&)':
hello.cpp:(.text._ZdlPvRKN3tbb8internal27allocate_continuation_proxyE[.text._ZdlPvRKN3tbb8internal27allocate_continuation_proxyE]+0xb): undefined reference to `tbb::internal::allocate_continuation_proxy::free(tbb::task&) const'
/tmp/icpcFDqPZs.o: In function `operator delete(void*, tbb::internal::allocate_child_proxy const&)':
hello.cpp:(.text._ZdlPvRKN3tbb8internal20allocate_child_proxyE[.text._ZdlPvRKN3tbb8internal20allocate_child_proxyE]+0xb): undefined reference to `tbb::internal::allocate_child_proxy::free(tbb::task&) const'
/tmp/icpcFDqPZs.o:(.data._ZTVN3tbb10interface68internal9flag_taskE[_ZTVN3tbb10interface68internal9flag_taskE]+0x28): undefined reference to `tbb::task::note_affinity(unsigned short)'
/tmp/icpcFDqPZs.o:(.data._ZTIN3tbb10interface68internal9flag_taskE[_ZTIN3tbb10interface68internal9flag_taskE]+0x10): undefined reference to `typeinfo for tbb::task'
/tmp/icpcFDqPZs.o:(.data._ZTVN3tbb10interface68internal11signal_taskE[_ZTVN3tbb10interface68internal11signal_taskE]+0x28): undefined reference to `tbb::task::note_affinity(unsigned short)'
/tmp/icpcFDqPZs.o:(.data._ZTIN3tbb10interface68internal11signal_taskE[_ZTIN3tbb10interface68internal11signal_taskE]+0x10): undefined reference to `typeinfo for tbb::task'
/tmp/icpcFDqPZs.o:(.data._ZTIN3tbb10interface68internal9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEE[_ZTIN3tbb10interface68internal9start_forINS_13blocked_rangeIiEE5HelloNS_16auto_partitionerEEE]+0x10): undefined reference to `typeinfo for tbb::task'

Can someone help me figure out what might be causing this? I've got a much more complex piece of code in which I could really use a parallel_for, but unless I can get it working, it appears I'm out of luck.

Thanks,

--brtaylor92

Problems with parallel_for

Vladimir_P_1234567890 — Sun, 25 Sep 2011 06:04:00 GMT

hibrtaylor92,

did you add -ltbb to compile/link command line?

--Vladimir

Problems with parallel_for

brtaylor92 — Sun, 25 Sep 2011 15:04:19 GMT

I feel somewhat silly for not thinking of that, but I hadn't. There are no errors now, but the program also doesn't display any output. Assuming I'm reading my own code correctly, shouldn't it print 5 lines worth of "Hello, world" ?

Edit: So after re-reading the tutorial, I was mis-using blocked range. Now that I've fixed that, the code works as intended.

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