Intel Software Network - feed

problem with installing cilk++

Wed, 18 Nov 2009 17:26:19 -0800

hi every one,
iam a novice working on cilk++. i had a problem with installing and running the cilk++ examples on my test system. i performed the following steps as mentioned in the cilk++ release notes
1. I downloaded cilk++ 64-bit software cilk_8503-x86_64.release.tar.gz.
2. unzipped to my home directory /home2/chow../ and a folder was created /home2/chow../cilk
3. i set the path using the command PATH= /home2/chow../cilk/bin:$PATH.
4. next i changed to the examples directory cd /home2/scra07/cilk/examples/qsort.
5. i tried to build and run the program using the command make.
after this iam getting a problem i couldn't see any message or output (or)some times iam getting a message like "make: Nothing to be done for `all'." .
Could any one please help me with this problem.

Open MP inside Cilk++

Tue, 17 Nov 2009 05:37:10 -0800

Hi,

Is it possible to use an external code written in Open MP inside a cilk++ program ? Does cilk provide this
flexibility ?

Thanks!
pkroy

Multithreaded implementation of Intel ODE Solvers

Mon, 16 Nov 2009 22:07:55 -0800

Hello,

I tried to use Intel ODE solver library in my master course project. It is really easy-to-use and high-quality library. Thanks a lot to Intel engineers for this awesome software.

One thing I would like to know: will be multithreaded implementation available for this library in the future?

Best regards,
Art

PTU license issue

Fri, 13 Nov 2009 13:58:28 -0800

I bought a license for Vtune performance Analyzer for Linux, Version 9 recently. I also downloaded the accompanying Performance Tuning Utility, PTU 3.2. I installed the VTune performance analyzer and the PTU. However, when I try to use the PTU, I get following error:

Error: A license for PerfAnl could not be obtained.

Your license is not current enough to allow you to use this

newer version of our software. Usually this occurs because

your support services license expired before we created this

version. You will need to purchase a new license.

Note that I haven't used installed this software in any other machine and this is the first time I am trying to use it.

Can some one help?

Thanks,

Anirban

vtssrun not profiling child processes

Wed, 11 Nov 2009 10:00:04 -0800

Hi,

I am trying to run vtssrun with apache server where one master process spawns several child processes.
vtssrun does not seem to be collecting profile data for the child processes and I can't figure out why.

This is how I am invoking vtssrun

vtssrun --

After the run completes, I see a lot of empty .vtss files.

vtssview -p
gives some results but very few samples and none from the child process.

I also tried attaching to one of the apache child processes with

vtssrun -a

but it immediately exits with the below message.

Internal Error: Attached application can be terminated abnormally
Stop request has been processed..

I think trace:trace is default mode, so child process s'd be getting profiled by default. Can you please help with this ?

thanks,
Sujit

comparison cilk++, openmp, pthreads first results

Thu, 05 Nov 2009 04:10:30 -0800

Hello,

Here the first results of my comparison of cilk++ and openmp, on my application which is 3D meshgeneration. I have done here the first part which is octree-refinement + inserting triangles. The reference is a pthreaded version of the code.
Please consider, that these are first numbers. The difference between cilk++ and openmp is also due to the used compiler-version (but cilk is done only for the 4.2.4).

best regards

Ferdinand

PTU Error with OpenGL apps and new NVIDIA drivers

Wed, 04 Nov 2009 09:40:40 -0800

Running on Redhat 5 64-bit linux machines (tried on several different ones) with NVIDIA driver 185.18.14 or later, if I try to profile (vtssrun) any OpenGL app using ptu 3.2, I receive the following errors:

2714602317306492 : 2a95f18680 : CRITICAL : 'dlsym' for '_Exit' error Bad file descriptoropen log '(null)': Bad address
write log: Bad file descriptor
2714602317342532 : 2a95f18680 : CRITICAL : 'dlsym' for '_exit' faild. Error Bad file descriptoropen log '(null)': Bad address
write log: Bad file descriptor

If I roll back to 173.x.x drivers (specifically 173.14.12) the profiling works as expected

User undo action in TM

Wed, 04 Nov 2009 05:42:38 -0800

STM ABI says that function registered by calling _ITM_addUserUndoAction() is executed if a transaction is aborted or retried to allow the user code to undo any operations.

Is it possible to get pointer to _ITM_abortReason struct or to detect if transaction was aborted by user or retried inside this user-defined function?

cilk++ does not support 64bit programming ?

Tue, 03 Nov 2009 15:10:58 -0800

I find my cilk++ code can not be compiler wtih vs 2008 and intel c++ if I choose win64 platform.

openmp vs cilk++

Mon, 02 Nov 2009 19:18:49 -0800

which one is better ?
easy to use, performance ?