On 18 September 2014 08:04, Jan Gebauer <[email protected]> wrote: > Am 17.09.2014 um 17:59 schrieb Marcin Wojdyr: >> Some computers in Diamond running RHEL6 also have the slow-coot >> problem. Our IT even informed RedHat about it: >> Marcin >> > > Is this really the same problem (only slow with labels on)? Kay once > reported that RHEL and derivatives do not have this problem: > https://www.mail-archive.com/coot%40jiscmail.ac.uk/msg03501.html > > Would be very interesting to now whether RHEL is affected or not, as we > considering switching distributions.
It's affected. I don't think it's a distro-specific problem. When coot uses glutBitmapCharacter() it becomes slow spending almost all cycles in i965_dri.so. It's much slower than with software rendering, so starting it as: LIBGL_ALWAYS_SOFTWARE=1 coot makes it faster. It's probably even faster when llvmpipe is used for software rendering (I haven't measure it), but then you get black fonts on black background. It may all depend on the version of Mesa. As for not affected RHEL, what's the output of glxinfo | grep OpenGL ? Marcin
