<div dir="ltr"><div>Hello, everyone, </div><div><br></div><div>I am a beginner in Institute of High Energy Physics, China.</div><div><br></div><div>I am using ubuntu16.04 and my machine has two cpus:</div><div> </div><div> Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GHz X2</div><div><br></div><div>I am trying to repeat "Gallery: Binary, inspiraling neutron stars forming a hypermassive neutron star" in <a href="http://einsteintoolkit.org/gallery/bns/index.html">http://einsteintoolkit.org/gallery/bns/index.html</a>. I am using the par file and <a href="http://thornlist.th">thornlist.th</a> provided in the webpage.</div><div> </div><div>However, I found it runs slowly when I run with "mpirun -np 2 ./Cactus_sim nsns.par". It needs about 600s per iteration. All cpu's usage are 100%.</div><div><br></div><div>Then I try to directly run with command "./Cactus_sim nsns.par", then it needs about 13s per iteration. All cpu's usage are 100%.</div><div><br></div><div>And then, I try to run with "numactl --cpunodebind=0 --preferred=0 ./cactus_sim nsns.par", It only needs 2.5s per iteration. And just half cpu ( 28 of 56 )'s usage are 100%.</div><div><br></div><div>I wonder is there some error? I think it should be faster when mpirun are used.</div><div><br></div><div>Yours, </div><div>ZhiChao.</div><div class="gmail_signature"><div dir="ltr"><div></div></div></div>
</div>