fix: fail CLI edit if shared memory is not available #7921
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marimo edit today requires shared memory; this change updates the CLI to exit with an informative error if we detect that shared memory is not available This fixes an issue in which running marimo on minimal sandboxes that don't have /dev/shm led to a confusing error state, with the frontend repeatedly failing to connect.
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…github.com:marimo-team/marimo into aka/fix-fail-fast-when-shared-memory-not-available
mscolnick
reviewed
Jan 21, 2026
| " - If running in Docker, ensure /dev/shm is mounted with sufficient size\n" | ||
| " (e.g., --shm-size=256m or -v /dev/shm:/dev/shm)\n" | ||
| " - If /dev/shm is full, clear unused shared memory segments\n" | ||
| " - Use 'marimo run' instead if you only need to view notebooks" |
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another option is to warn and then disable virtualfiles (we do support disabling virtual files and it will inline data)
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Oh interesting. I think this is fine for now, but if someone opens an issue we can consider
mscolnick
approved these changes
Jan 21, 2026
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Failing test looks unrelated (this PR does not have API changes) |
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marimo edit today requires shared memory; this change updates the CLI to exit with an informative error if we detect that shared memory is not available This fixes an issue in which running marimo on minimal sandboxes that don't have /dev/shm led to a confusing error state, with the frontend repeatedly failing to connect. --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
botterYosuke
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Jan 23, 2026
marimo edit today requires shared memory; this change updates the CLI to exit with an informative error if we detect that shared memory is not available This fixes an issue in which running marimo on minimal sandboxes that don't have /dev/shm led to a confusing error state, with the frontend repeatedly failing to connect. --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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marimo edit today requires shared memory; this change updates the CLI to exit with an informative error if we detect that shared memory is not available
This fixes an issue in which running marimo on minimal sandboxes that don't have /dev/shm led to a confusing error state, with the frontend repeatedly failing to connect.