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Yes, but still this version is not optimal. Clang trunk will produce
a little bit faster code.<br>
<pre class="moz-signature" cols="72">Best regards,
Alexey Bataev
=============
Software Engineer
Intel Compiler Team</pre>
<div class="moz-cite-prefix">19.08.2015 23:39, Finkel, Hal J. via
Openmp-dev пишет:<br>
</div>
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cite="mid:7680F369141D38439F620B3B1427503A385C338C@PAYTON.anl.gov"
type="cite">
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<div><i><font style="color:#333333"><br>
</font></i></div>
<div><i><font style="color:#333333">Sent from my Verizon
Wireless 4G LTE DROID</font></i></div>
<div><i><font style="color:#333333">On Aug 19, 2015 1:36 PM,
César via Openmp-dev <</font></i><a
moz-do-not-send="true"
href="mailto:openmp-dev@lists.llvm.org"><i><font
style="color:#333333"><a class="moz-txt-link-abbreviated" href="mailto:openmp-dev@lists.llvm.org">openmp-dev@lists.llvm.org</a></font></i></a><i><font
style="color:#333333">> wrote:</font></i></div>
<div><i><font style="color:#333333">></font></i></div>
<div><i><font style="color:#333333">> On Wed, Aug 19, 2015 at
3:07 PM, Jack Howarth <</font></i><a
moz-do-not-send="true"
href="mailto:howarth.mailing.lists@gmail.com"><i><font
style="color:#333333"><a class="moz-txt-link-abbreviated" href="mailto:howarth.mailing.lists@gmail.com">howarth.mailing.lists@gmail.com</a></font></i></a><i><font
style="color:#333333">> wrote:</font></i></div>
<div><i><font style="color:#333333">>></font></i></div>
<div><i><font style="color:#333333">>> On Tue, Aug 18,
2015 at 2:14 PM, César via Openmp-dev</font></i></div>
<div><i><font style="color:#333333">>> <</font></i><a
moz-do-not-send="true"
href="mailto:openmp-dev@lists.llvm.org"><i><font
style="color:#333333"><a class="moz-txt-link-abbreviated" href="mailto:openmp-dev@lists.llvm.org">openmp-dev@lists.llvm.org</a></font></i></a><i><font
style="color:#333333">> wrote:</font></i></div>
<div><i><font style="color:#333333">>> > Hello,</font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> > I don't know
if this is the correct list to talk about this - I did not
find</font></i></div>
<div><i><font style="color:#333333">>> > a better
place..</font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> > I am doing
performance experiments with a few OpenMP implementations
(IOMP,</font></i></div>
<div><i><font style="color:#333333">>> > GOMP and our
private impl.) and I am seeing a severe slowdown when I
use</font></i></div>
<div><i><font style="color:#333333">>> > IOMP (GOMP and
others are performing well).</font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> > The benchmarks
I am using are these ones:</font></i></div>
<div><i><font style="color:#333333">>> > </font></i><a
moz-do-not-send="true"
href="http://kastors.gforge.inria.fr/#%21index.md"><i><font
style="color:#333333"><a class="moz-txt-link-freetext" href="http://kastors.gforge.inria.fr/#!index.md">http://kastors.gforge.inria.fr/#!index.md</a></font></i></a></div>
<div><i><font style="color:#333333">>></font></i></div>
<div><i><font style="color:#333333">>> That web page
claims the benchmarks use parts of the OpenMP 4.0
specification.</font></i></div>
<div><i><font style="color:#333333">>></font></i></div>
<div><i><font style="color:#333333">>> "The KaStORS
benchmark suite has been designed to evaluate the
implementation of</font></i></div>
<div><i><font style="color:#333333">>> the OpenMP
dependent task paradigm, introduced as part of the OpenMP
4.0</font></i></div>
<div><i><font style="color:#333333">>> specification."</font></i></div>
<div><i><font style="color:#333333">>></font></i></div>
<div><i><font style="color:#333333">>> Currently openmp is
only complete for the OpenMP 3.2 specification</font></i></div>
<div><i><font style="color:#333333">>></font></i></div>
<div><i><font style="color:#333333">></font></i></div>
<div><i><font style="color:#333333">> I am able to compile a
few benchmarks that use task dependence annotations (from
OMP 4.0) but for those that specify the range of the
memory dependence I get syntax error. So, should I assume
that this part is not implemented, right? Is there a list
for the OMP 4.0 items that are currently supported?</font></i></div>
<div><i><font style="color:#333333">></font></i></div>
<div><i><font style="color:#333333">> BTW, the Clang version
from Github was able to parse these annotations, was it
dropped from the current newer version?</font></i></div>
<div><i><font style="color:#333333">></font></i></div>
<div><i><font style="color:#333333"><br>
</font></i></div>
<div><i><font style="color:#333333">It is not there yet. You'll
need to use the code from the github clang_trunk (and
llvm_trunk, etc.) repositories to get both recent
Clang/LLVM and all of the OpenMP features.</font></i></div>
<div><i><font style="color:#333333"><br>
</font></i></div>
<div><i><font style="color:#333333">-Hal</font></i></div>
<div><i><font style="color:#333333"><br>
</font></i></div>
<div><i><font style="color:#333333">> </font></i></div>
<div><i><font style="color:#333333">>></font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> > Really, the
slowdown is huge. For one of the programs
(plasma/dpotrf_taskdep</font></i></div>
<div><i><font style="color:#333333">>> > -n 8192 -b 64
-i 1 -c) the serial version executes in ~28s and the
parallel</font></i></div>
<div><i><font style="color:#333333">>> > one executes
in ~110s. I did some profiling and found that most of the
time</font></i></div>
<div><i><font style="color:#333333">>> > is being spent
on synchronization barriers and dependence tracking (see</font></i></div>
<div><i><font style="color:#333333">>> > attached
image). Before digging deeper I would like to hear back
from you if</font></i></div>
<div><i><font style="color:#333333">>> > I am doing
something wrong here:</font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> > - I tested
with the last version of the repository:</font></i></div>
<div><i><font style="color:#333333">>> > </font></i><a
moz-do-not-send="true"
href="http://llvm.org/svn/llvm-project/openmp/trunk"><i><font
style="color:#333333"><a class="moz-txt-link-freetext" href="http://llvm.org/svn/llvm-project/openmp/trunk">http://llvm.org/svn/llvm-project/openmp/trunk</a></font></i></a></div>
<div><i><font style="color:#333333">>> > - I am using
Ubuntu 14.10.</font></i></div>
<div><i><font style="color:#333333">>> > - I have
tested on more than one machine, the results above are
from a Intel</font></i></div>
<div><i><font style="color:#333333">>> > i7-3770</font></i></div>
<div><i><font style="color:#333333">>> > - The runtime
itself is compiled using: make compiler=gcc os_omp=linux</font></i></div>
<div><i><font style="color:#333333">>> > arch=32e</font></i></div>
<div><i><font style="color:#333333">>> > - The version
of GCC that I am using is: 4.9.1</font></i></div>
<div><i><font style="color:#333333">>> > - The version
of Clang that I am using to compile the benchmarks: 3.5.0</font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> > César.</font></i></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">>> >
_______________________________________________</font></i></div>
<div><i><font style="color:#333333">>> > Openmp-dev
mailing list</font></i></div>
<div><i><font style="color:#333333">>> > </font></i><a
moz-do-not-send="true"
href="mailto:Openmp-dev@lists.llvm.org"><i><font
style="color:#333333"><a class="moz-txt-link-abbreviated" href="mailto:Openmp-dev@lists.llvm.org">Openmp-dev@lists.llvm.org</a></font></i></a></div>
<div><i><font style="color:#333333">>> > </font></i><a
moz-do-not-send="true"
href="http://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev"><i><font
style="color:#333333"><a class="moz-txt-link-freetext" href="http://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev">http://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev</a></font></i></a></div>
<div><i><font style="color:#333333">>> ></font></i></div>
<div><i><font style="color:#333333">></font></i></div>
<div><i><font style="color:#333333">></font></i></div>
<div><i><font style="color:#333333"><br>
</font></i></div>
<div><br>
</div>
<div><font style="color:#333333"><i>Sent from my Verizon
Wireless 4G LTE DROID</i></font></div>
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