Os File Tmpfs

In this tutorial, you'll learn about How to Fix tmpfs Errors. We cover key concepts, practical examples, and best practices.

Fix tmpfs errors when tmpfs fills up memory/swap causing system OOM.

Quick Fix

Wrong

import os
# Writing large file to /dev/shm (tmpfs):
with open('/dev/shm/bigfile','w') as f:
    f.write('x'*(os.sysconf('SC_PAGE_SIZE')*10**6))  # huge file!

tmpfs uses RAM + swap. Writing too much fills RAM, triggers swapping, eventually OOM.

Right

import os, shutil
# Check available tmpfs space:
st=os.statvfs('/dev/shm')
available=st.f_frsize*st.f_bavail
print(f'Available tmpfs: {available//1024//1024} MB')
# Use with bounded size:
max_size=100*1024*1024  # 100MB
if available<max_size:
    print('Not enough tmpfs space')
else:
    with open('/dev/shm/temp.bin','wb') as f:
        f.write(b'x'*max_size)
# Clean up:
shutil.rmtree('/dev/shm/temp.bin', ignore_errors=True)

tmpfs space checked before write. Bounded to 100MB. Cleaned up after use.

Prevention

tmpfs uses RAM. Monitor /dev/shm usage. Don't write unbounded files to tmpfs.

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