libframetime

A preloadable library, able to dump the frame times of any OpenGL application on Linux, on any driver.

By default, the timing is written into /tmp/libframetime.out, but you can specify an alternate file with the LIBFRAMETIME_FILE env var.

To compile without EGL support (if you don’t have the EGL headers), add -DNO_EGL to your CFLAGS.

Required Packages

Linux (For example, Debian):

• gcc (for base compiling)

• mesa-common-dev (glx.h)

• libegl1-mesa-dev (egl.h)

Usage

LD_PRELOAD=path/to/libframetime.so dota2

For Steam Users,choose launch options for a given title. Example:

LD_PRELOAD=path/to/libframetime.so %command%

Or with a custom output file:

LIBFRAMETIME_FILE=/tmp/dota2.frametime LD_PRELOAD=path/to/libframetime.so dota2

The accompanying awk script can be used to calculate the usual stats:

stats.awk < libframetime.out

Min/avg/max frametimes (us):    166 / 625.626 / 5955
Min/avg/max FPS:                167.926 / 1598.4 / 6024.1

50/90/95/99 percentiles (us):   410 / 434 / 589 / 5018