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Other shared caches - shared memory

. IPC::Cache
- No max size
- Not transparent
- Uses shared memory
. OS limit on amount of shm in use, and segment size
. shm segments have 32 bit integer ids
. shm locking survives process death
. IPC::SharedCache
+ Tied hash interface
+ Transparent (read only)
+ Max size can be specified
- Uses shared memory

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