[ARVADOS] created: 2.1.0-1480-gcaf80418a

[Git user]

        at  caf80418a903c9be5a8a3dbebd8767bb751f7c4b (commit)


commit caf80418a903c9be5a8a3dbebd8767bb751f7c4b
Author: Ward Vandewege <ward at curii.com>
Date:   Fri Oct 8 12:49:20 2021 -0400

    18259: initial doc improvements.
    
    Arvados-DCO-1.1-Signed-off-by: Ward Vandewege <ward at curii.com>

diff --git a/doc/install/singularity.html.textile.liquid b/doc/install/singularity.html.textile.liquid
index bd990b491..356a5b0bf 100644
--- a/doc/install/singularity.html.textile.liquid
+++ b/doc/install/singularity.html.textile.liquid
@@ -15,6 +15,7 @@ Arvados can be configured to use "Singularity":https://sylabs.io/singularity/ in
 
 *Current limitations*:
 * Even when using the singularity runtime, users' container images are expected to be saved in Docker format using @arv keep docker at . Arvados converts the Docker image to Singularity format (@.sif@) at runtime as needed. Specifying a @.sif@ file as an image when submitting a container request is not yet supported.
+* Because Docker images are converted on the fly as needed (fixme ref to cache) by mksquashfs, some memory is required for that conversion. The amount of memory that mksquashfs uses can be restricted in `/etc/singularity/singularity.conf` with a line like `mksquashfs mem = 512M`, if needed. The amount of memory made available for mksquashfs should be configured lower than the smallest amount of memory requested by a container on the cluster.
 * Singularity does not limit the amount of memory available in a container. Each container will have access to all memory on the host where it runs, unless memory use is restricted by SLURM/LSF.
 * Programs running in containers may behave differently due to differences between Singularity and Docker.
 ** The root (image) filesystem is read-only in a Singularity container. Programs that attempt to write outside a designated output or temporary directory are likely to fail.

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