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-SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
-appl-config-option-type: integer
-constraints:
- set:
- - 16
- - 32
- - 64
- - 128
- - 256
- - 512
-copyrights:
-- Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
-default-value: 128
-description: |
- The value of this configuration option defines the block size for in-memory
- files managed by the IMFS.
-enabled-by: true
-index-entries: []
-interface-type: appl-config-option
-links:
-- role: appl-config-group-member
- uid: group-filesystem
-name: CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK
-notes: |
- The configured block size has two impacts. The first is the average amount of
- unused memory in the last block of each file. For example, when the block
- size is 512, on average one-half of the last block of each file will remain
- unused and the memory is wasted. In contrast, when the block size is 16, the
- average unused memory per file is only 8 bytes. However, it requires more
- allocations for the same size file and thus more overhead per block for the
- dynamic memory management.
-
- Second, the block size has an impact on the maximum size file that can be
- stored in the IMFS. With smaller block size, the maximum file size is
- correspondingly smaller. The following shows the maximum file size possible
- based on the configured block size:
-
- * when the block size is 16 bytes, the maximum file size is 1,328 bytes.
-
- * when the block size is 32 bytes, the maximum file size is 18,656 bytes.
-
- * when the block size is 64 bytes, the maximum file size is 279,488 bytes.
-
- * when the block size is 128 bytes, the maximum file size is 4,329,344 bytes.
-
- * when the block size is 256 bytes, the maximum file size is 68,173,568 bytes.
-
- * when the block size is 512 bytes, the maximum file size is 1,082,195,456
- bytes.
-text: ''
-type: interface