Оптимизация? Конечно, каждый сталкивался с данной задачей при разработке своих, сколь-нибудь значительных, требующих определённых вычислений, приложений. При этом способов оптимизировать код существует огромное множество, и, как следствие, различных путей сделать это в автоматическом режиме с помощью опций компилятора. Вот здесь и возникает проблема – как выбрать то, что нужно нам и не запутаться?
We did a webinar this morning at 8am Pacific time on changes and new updates in Cilk in the Intel Parallel Composer beta. I am posting the slides here. Let me know if there's any interest to do another webinar on this around 5pm or so Pacific time - I want to see if there's anyone that couldn't attend due to the time that would have liked to attend. Thanks everyone, and I really enjoyed the questions in today's session.
It appears that the compiler option -mfpmath=387 immediately causes floating point exceptions on Intel architecture processors in cilk_spawn routines compiled with gcc-5.1 cilk. This seems to be a regression as gcc-4.9 with the cilk patches works fine. Note that -mfpmath=sse works on 64-bit machines, however, this option is not available for 32-bit Intel machines. As far as I can tell, most floating point code is affected. Does anyone know of patches or workarounds for this, especially as this appears to be a show-stopper on 32-bit Intel.
I compiled the new release of gcc-5.1 with the Cilkplus parallel processing extensions and runtime library for ARMv7 architecture on the Raspberry Pi 2B single board computer. Two changes were needed.
The first change corrects a typo in generic/cilk-abi-vla.c by changing the second to the last line of the file from
the second change was to generic/os-fence.c and ARM specific. Comment out the line
COMMON_SYSDEP void __cilkrts_fence(void); ///< MFENCE instruction
I note that premier.intel.com is open for submissions for the first time in months, so I submitted a ticket. It still looks like setting up premier for beta 16 has not been completed, as the form requires choosing compiler version 15.0 or earlier from the pull-down.
I'm curious whether Cilk(tm) Plus is under deprecation, in view of the comments at IDF last year that Intel would not sponsor publications on it, and the lack of follow-through to make gcc -fcilkplus viable.
As to changes in behavior in the beta test:
Hi I am trying to offload some parallel work to MIC using _Cilk_Shared and _Cilk_offload.
I declare a Cilk shared function:
_Cilk_shared void somefun(int count)
In main I call this function using
_Cilk_offload somefun(12) ;
inside this function everything is expected to be offloaded to MIC;
I want to declare a Cilk reducer inside somefun, so I can then use cilk_for and append to a cilk reducer list,
but I get error:
Hi I am new to cilk plus and MIC. I had this topic in MIC forum as well
I have a problem where I need to offload/parallel process some data, append to a list B , and return to the host. The host will then combine this list to another host std::list<T> A.
I have following approach:
Hello, and thank you for your time.
I've just installed a fresh version of GCC Cilk Plus, and my first simple program is presenting an anomalous warning.
I was following the instructions from https://www.cilkplus.org/build-gcc-cilkplus, and I consistently got an error saying that "tm.h": no file or directory was found. I'm not sure what tm.h is, or what package it is included with.
I installed the following packages: GNAT (probably doesn't help), GMP, MPFR, MPC, ISL, Flex, Bison.
My configuration options were `./configure --prefix=/usr/lib/gcc/cilkplus --enable-languages="c,c++" --disable-multilib`
On Ubuntu 14.10.
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