From de8c6ce08a7aa329989b35342506f2458002abdb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?V=C3=ADt=20Ku=C4=8Dera?= <26327373+vkucera@users.noreply.github.com> Date: Thu, 4 Jun 2026 19:46:55 +0200 Subject: [PATCH] Troubleshooting: Rephrase the help for the shm error --- docs/troubleshooting/README.md | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/docs/troubleshooting/README.md b/docs/troubleshooting/README.md index 1155e6a5..8fdd2701 100644 --- a/docs/troubleshooting/README.md +++ b/docs/troubleshooting/README.md @@ -180,12 +180,20 @@ Error in : Failed to connect to any server! Giving up - You should be greeted with `Welcome to the ALICE GRID`. - Exit with `exit`. -### shmem: could not create a message of size ... +### Could not create a message -Add `--shm-segment-size 1000000000` (or larger number) to your o2 command. -It is due to shared memory segment that is probably outdated for the size of the intermediate tables you have. It is actually set as 90% of system's max VSIZE allowance set in limits, or 2GB if the limits cannot be found, which is probably what happens in your case. +Error message: + +```text +shmem: could not create a message of size ... +``` + +The shared-memory segment is probably too small for the size of the intermediate tables you have. +It is set as 90 % of system's maximum `VSIZE` set in limits or 2 GB, if the limits cannot be found, which is probably what happens in your case. + +Set `--shm-segment-size 1000000000` (or larger) in your O2 command. -## Graphical issue with high DPI monitors +## Graphical issue with high-DPI monitors When using monitors with high DPI the labels and text in TBrowser might be too small, especially when fractional scaling is enabled in multiple monitors setup. A workaround for this issue is to create a local .rootrc file in the $HOME folder including the following lines, edited with your own