How to use the cilkview?

[Lawrence_R_]

I have a C search application  on a centos 6.x 64 bit linux server that I just installed the cilkplus compiler on to take advantage of more cpu/cores. I've added the cilk_spawn function to some recursive scanning functions in my program.  After re-compiling the search application with the cilkplus gcc compiler, the search program is working as intended without any seg faults or any other errors.

My question is how do I use the cilkview analyzer? I want to if cilkplus/spawning is helping my search application and if so by how much?

Thanks!

Lawrence

[Barry_T_Intel]

When you installed the Cilk Tools, there should have been a "doc" directory containing cilktools.html.  It should explain how to run Cilkview and how to interpret the output. Is this documentation insufficient?

   - Barry

[Lawrence_R_]

Hi Barry,

Thanks for the quick reply!  Is the cilk tools a separate item to install outside of the gcc compiler?  I did a search for the doc directory and this is all I have on the server:

/cilkplus/boehm-gc/doc
/cilkplus/zlib/doc
/cilkplus/x86_64-unknown-linux-gnu/libstdc++-v3/doc
/cilkplus/libstdc++-v3/doc
/cilkplus/gcc/doc
/cilkplus/prev-x86_64-unknown-linux-gnu/libstdc++-v3/doc
/cilkplus/stage1-x86_64-unknown-linux-gnu/libstdc++-v3/doc
/cilkplus/host-x86_64-unknown-linux-gnu/prev-gcc/doc
/cilkplus/host-x86_64-unknown-linux-gnu/gcc/doc
/cilkplus/host-x86_64-unknown-linux-gnu/stage1-gcc/doc
/cilkplus/libffi/doc
/cilkplus/libgo/go/go/doc
/cilkplus/libjava/classpath/doc

[Barry_T_Intel]

Yes. The Cilk Tools are available from the Download page of the Cilk Plus website: http://www.cilkplus.org/download

You'll find them referred to as the "Intel Cilk Plus SDK."

   - Barry

[Lawrence_R_]

Hi so I downloaded the cilk tools and perused the cilktools.html#CilkviewAssumptions and when I try and run the cilkview on my system I get the following error:

$ cilkview ./search
cilkview: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory

Currently I have the cilk tools on my root directory:

/root/cilktools-linux

/root/cilktools-linux/bin/cilkview

So I understand that the error is related to some kind of missing path or not seeing the correct location of the file needed.  Currently I have the following locations for libstdc++.so

$ find / -name libstdc++.so
/usr/lib/gcc/x86_64-redhat-linux/4.4.4/32/libstdc++.so
/usr/lib/gcc/x86_64-redhat-linux/4.4.4/libstdc++.so
/opt/centos/devtoolset-1.1/root/usr/lib/gcc/x86_64-redhat-linux/4.7.2/32/libstdc++.so
/opt/centos/devtoolset-1.1/root/usr/lib/gcc/x86_64-redhat-linux/4.7.2/libstdc++.so
/cilkplus/cilkplus-install/lib64/libstdc++.so
/cilkplus/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so
/cilkplus/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so
/cilkplus/stage1-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so

How can I resolve this issue?

Thanks for all the help you guys have shown over the last couple of days!

[Lawrence_R_]

in my bashrc file I have the following:

export PATH=/cilkplus/cilkplus-install/bin:$PATH
export CPATH=/cilkplus/cilkplus-install/include:$CPATH
export LIBRARY_PATH=/cilkplus/x86_64-unknown-linux-gnu/libcilkrts/.libs/:/cilkplus/cilkplus-install/lib:/cilkplus/cilkplus-install/lib/../lib64:$LIBRARY_PATH
export LD_LIBRARY_PATH=/cilkplus/x86_64-unknown-linux-gnu/libcilkrts/.libs/:/cilkplus/cilkplus-install/lib:$/cilkplus/cilkplus-install/lib/../lib64:$LD_LIBRARY_PATH
export PATH=/root/cilktools-linux/bin:$PATH

[Lawrence_R_]

Also I have previously installed the clikplus on my mac.  I tried to test out the cilkview there and got a curious error:

/Users/cilkm2search/dev/app/cilktools/bin/cilkview  test
root_dir: /Users/cilkm2search/dev/app/cilktools/

Cilkview: Generating scalability data
Cilkview Scalability Analyzer V2.0.0, Build 3566
Error: No Cilk code found in program

However the test program is just the basic fib example with cilk_spawn and cilk_sync:

#include <cilk/cilk.h>
#include <assert.h>

int fib(int n) {
  if (n < 2)
    return n;
  int a = cilk_spawn fib(n-1);
  int b = fib(n-2);
  cilk_sync;
  return a + b;
}

int main() {
  int result = fib(30);
  assert(result == 832040);
  return 0;
}

Also cilk is working though in the program:

unknown68a86d1de446:test lawrence$ CILK_NWORKERS=4 time ./test
        0.04 real         0.15 user         0.00 sys
unknown68a86d1de446:test lawrence$ CILK_NWORKERS=1 time ./test
        0.10 real         0.10 user         0.00 sys

[Lawrence_R_]

I believe I fixed the issue for linux install of cilk tools. I was on centos6 64 bit OS and I need the 32 bit libs:

http://ipswitchft.force.com/kb/articles/FAQ/How-to-install-32-bit-version-of-libstdc-on-RHEL-6-64-bit

http://stackoverflow.com/questions/11471722/libstdc-so-6-cannot-open-shared-object-file-no-such-file-or-directory

[Lawrence_R_]

I believe I fixed the issue for linux install of cilk tools. I was on centos6 64 bit OS and I need the 32 bit libs:

http://ipswitchft.force.com/kb/articles/FAQ/How-to-install-32-bit-version-of-libstdc-on-RHEL-6-64-bit

http://stackoverflow.com/questions/11471722/libstdc-so-6-cannot-open-shared-object-file-no-such-file-or-directory

[Barry_T_Intel]

Hi Lawrence.

I'm glad to hear that you've resolved your problems on CentOS.

The message "Error: No Cilk code found in program" means that Cilkview (and Cilkscreen) didn't see any metadata. Which compiler are you using?

   - Barry

[Lawrence_R_]

For my mac which was getting the error message about not finding the cilk meta data, I followed these instructions here:

"An implementation of the Intel® Cilk™ Plus C/C++ language extensions in LLVM"

http://cilkplus.github.io/

[Barry_T_Intel]

Ah! Cilk Plus/LLVM is known to not be generating metadata.

I recommend that you post a bug about it. At the bottom of http://cilkplus.github.io/ there are directions to report bugs or make feature requests at https://github.com/cilkplus/clang/issues .

    - Barry