<div dir="ltr"><div>Hi Florian </div><div><br></div><div>thank you for your remarks and the information about the details of the implementation. However that input was just to test the density_propagation with the admm. My input for thereal-time spectrum contained the right keyword (rt_propagation). I tested the ARNOLDI algorithm and I did not get any speed-up respect to the padè. However as you pointed out, I used a small eps_schwartz I am going to try 1E-7 and later the truncated exchange.</div><div><br></div><div>Luca </div><br>On Wednesday, May 6, 2015 at 12:50:55 PM UTC+2, Florian Schiffmann wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">Hi
<br>
<br>A few remarks on your input.
<br>
<br>You are running ehrenfest dynamics which is not what you want. For spectra you need rt_propagation. This will speed up your calculation as no forces are required. Furthermore integrals only need to be computed at the very first step and afterwards are read from memory. Its mor than a factor of 2 at least in speed.
<br>I doubt eps_schwarz needs to be so low. Try 10e-7. This should still be accurate but again faster rtp steps.
<br>
<br>Would be nice if you could post timings with these settings.
<br>
<br>Flo</blockquote></div>