Mateusz Loskot :: hacking on, working out, living up

parallel_sort crashes on Ubuntu 9.10

20 Feb 2010 | mloskot

I’ve started to experiment with the Intel Threading Building Blocks and hit a wall trying to run a very simple example:

#include <tbb/parallel_sort.h>
#include <cmath>
#include <vector>
using namespace tbb;
int main()
    const int n = 100000;
    std::vector<double> a(n);
    for (int i = 0; i < n; i++)
        a[i] = std::sin(double(i));
    parallel_sort(a.begin(), a.end());

$ g++ -O0 -g -DTBB_USE_DEBUG  -o sort_vector sort_vector.cpp -ltbb
$ gdb ./sort_vector

(gdb) run
Starting program: /home/mloskot/workshop/tbb/parallel_sort/sort_vector
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
tbb::task_group_context::init (this=0x7ffffff9c4e0) at ../../src/tbb/task.cpp:3124
3124    ../../src/tbb/task.cpp: No such file or directory.
in ../../src/tbb/task.cpp
(gdb) bt
#0  tbb::task_group_context::init (this=0x7ffffff9c4e0) at ../../src/tbb/task.cpp:3124
#1  0x00000000004013ff in task_group_context (this=0x7ffffff9c4e0, relation_with_parent=tbb::task_group_context::bound)
at /usr/include/tbb/task.h:284
#2  0x0000000000401be4 in tbb::internal::parallel_quick_sort<float *, std::less<float> > (begin=0x7ffffff9c6a0,
end=0x7fffffffe120, comp=...) at /usr/include/tbb/parallel_sort.h:155
#3  0x0000000000401b23 in tbb::parallel_sort<float *, std::less<float> > (begin=0x7ffffff9c6a0, end=0x7fffffffe120,
comp=...) at /usr/include/tbb/parallel_sort.h:203
#4  0x0000000000401ab3 in tbb::parallel_sort<float> (begin=0x7ffffff9c6a0, end=0x7fffffffe120)
at /usr/include/tbb/parallel_sort.h:219
#5  0x0000000000401363 in main () at sort_vector.cpp:12

It seems like a failure during initialization of worker threads pool or close to it.

I’m using fairly recent version of TBB 2.1 installed from Ubuntu 9.10 packages, but I’m suspicious this may be a problem with this particular binary version. Let’s see what Intel folks will judge parallel_sort example throws segmentation fault. Pity Microsoft PPL does not provide parallel_sort algorithm.

Update: see parallel_sort problem fixed

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