diff --git a/docs/faq/README.md b/docs/faq/README.md index f3006697..0fb467ce 100644 --- a/docs/faq/README.md +++ b/docs/faq/README.md @@ -38,9 +38,3 @@ Hyperloop trains have a so-called express train feature. This feature is based o ### Why is it that my train test has a CPU warning but my wagon test was fine? This usually happens in a situation where the wagon test (which runs on a single core) uses so much memory that it doesn't fit a single core job on the grid and therefore needs two cores for the train (more cores means a higher memory allowance). But if the devices in the wagon cannot be parallelised well over multiple cores, this leads to more wall time and a higher CPU usage as the cores will be underutilised. In this situation, one can either reduce the wagon memory consumption to fit into a single core or reduce the CPU consumption to fit the dataset. - -## Your local machines -### `shmem: could not create a message of size ...` - -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 -It is due to shared memory segment that is probably outdated for the size of the intermediate tables you have.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. diff --git a/docs/troubleshooting/README.md b/docs/troubleshooting/README.md index 261d25b6..1155e6a5 100644 --- a/docs/troubleshooting/README.md +++ b/docs/troubleshooting/README.md @@ -180,6 +180,11 @@ 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 ... + +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 +It is due to shared memory segment that is probably outdated for the size of the intermediate tables you have.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. + ## 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