On 10/11/2015 11:27 AM, Patrick Dupre wrote:
Actually, the issue is with xmgrace which generate:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
1351 root      20   0  462744 105588  50068 R  84.4  3.5  24:46.20 Xorg.bin

If you're seeing high CPU utilization in Xorg.bin, it's probably an indication that you are using gnome-shell, and your graphics driver doesn't support GL acceleration. In that case, Xorg.bin will use software rendering (llvmpipe). So, check your logs for further info.

---
$ systemctl list-units -t scope
UNIT                             LOAD   ACTIVE SUB     DESCRIPTION
session-5.scope loaded active running Session 5 of user martin
[...]
$ journalctl -b -u session-5.scope

You could create a shortcut for this in bash, like this:

alias xsession-errors='journalctl -b -u $(systemctl -t scope | awk "/user $USER\$/ { print \$1; }")'
---

https://ask.fedoraproject.org/en/question/40930/where-does-stdout-from-applications-go-to-when-started-in-gnome-f20/
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