<div dir="ltr">Hi Ondrej,<div><br></div><div>there is the an EVAL_ENERGY_FORCES <span style="line-height: 17px; color: rgb(0, 0, 0); font-family: Tinos; font-size: medium;">keyword in the MD section, I guess it is meant to do what you are asking about. Maybe it only changes output or something at the moment?</span><div><font color="#000000" face="Tinos" size="3"><span style="line-height: 17px;"><br></span></font></div><div><font color="#000000" face="Tinos" size="3"><span style="line-height: 17px;">Matt</span></font></div><br>On Friday, February 19, 2016 at 2:53:53 AM UTC, Ondřej Maršálek wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">Dear CP2K developers,
<br>
<br>I am doing reftraj runs where I am interested in some electronic
<br>properties, but not in the forces on atoms. It seem that these are
<br>always calculated, though, with no setting in the input file - the one
<br>that is available is energy+forces or nothing. I have tried disabling
<br>forces in `force_env_methods.F` (just changing `calculate_forces`)
<br>and, as an example, with a hybrid functional I got times per step go
<br>down from ~135 s to ~115 s. While this is not a deal breaker by any
<br>means, it would be nice to have a settings for reftraj, where you can
<br>enable the calculation of the forces separately. My guess would be
<br>that on line 1674 of `motion/integrator.F` the call to
<br>`force_env_calc_energy_force` should get `calc_force` passed to it,
<br>which would be read from a new setting in the REFTRAJ section.
<br>
<br>Thank you for considering this,
<br>Ondrej
<br></blockquote></div></div>