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- ====== NOSview [301]
- memory
- ======
-
- _________________________________________________________________
- memory circular [on|off] Default: on
- _________________________________________________________________
- Experimental flag for enabling or disabling reset of a search
- pointer.
-
- >> Example: memory circular off
-
-
- _________________________________________________________________
- memory debug [on|off] Default: off
- _________________________________________________________________
- Display or set the memory allocator debug flag.
-
- If set to 'on', debug information containing most flags and
- parameters from the memory allocation routines is written to the
- log file.
-
-
- _________________________________________________________________
- memory efficient [on|off] Default: on
- _________________________________________________________________
- Displays or sets the search algorithm for buffer memory.
-
- When set to 'on' the search is always started from the beginning
- of the free list. This is slower but keeps memory fragmentation
- to a minimum.
-
- When set to 'off', the search is started from the end, accounting
- for more memory fragmentation but keeping speed.
-
- (Rumours state that you should include this command as the first
- line in /autoexec.nos. The current releases set the 'efficient'
- default to 'yes').
-
- >> Example: memory efficient off
-
-
- _________________________________________________________________
- memory free
- _________________________________________________________________
- Display the storage allocator free list. Each entry consists of
- a starting address, in hex, and a size, in decimal bytes.
-
-
- _________________________________________________________________
- memory garbage
- _________________________________________________________________
- Start garbage collection. Warning: This does not work as
- advertised.
-
-
- _________________________________________________________________
- memory ifbufsize [<bytes>] Default: 2048
- _________________________________________________________________
- Display or set the size of the buffers in the interrupt buffer
- pool.
-
- The size should be set to the largest type of buffer plus a
- header size of 22.
-
- For example: If AX.25 is the only interface and a packet length
- of 256 is defined, the 'ibufsize' should be 256 + 10 * 6 + 22.
- The 10 * 6 is the AX.25 header (source, destination and 8
- digipeaters).
-
- >> Example: memory ifbufsize 338
-
-
- _________________________________________________________________
- memory minheap [<number>]
- _________________________________________________________________
- Display or set the minimum heap size to be allocated before shell
- escaping to DOS. This assures a free heap so that NOS can run
- without getting short on memory for a while.
-
-
- _________________________________________________________________
- memory nibufs [<n>] Default: 5
- _________________________________________________________________
- Display or set the number of buffers in the interrupt buffer
- pool.
-
- If the number of buffers is set, the statistics in the memory
- status display are reset for number of interrupt buffer fails.
- The minimum available value is set to the requested number of
- buffers.
-
- A rule of thumb for the number of buffers is to watch the
- statistics and keep a minimum of 2 free buffers. Increase or
- decrease as required.
-
- >> Example: memory nibufs 10
-
-
- _________________________________________________________________
- memory sizes
- _________________________________________________________________
- Display a histogram of storage allocator request sizes. Each
- histogram bin is a binary order of magnitude (i.e. a factor of
- 2).
-
-
- _________________________________________________________________
- memory status
- _________________________________________________________________
- Display a summary of storage allocator statistics.
-
- The first line shows the base address of the heap, its total
- size, the amount of heap memory available in bytes and as a
- percentage of the total heap size, and the amount of memory left
- over (i.e. not placed on the heap at startup) and therefore
- available for shell subcommands.
-
- The second line shows the total number of calls to allocate and
- free blocks of memory, the difference of these two values (i.e.
- the number of allocated blocks outstanding), the number of
- allocation requests that were denied due to lack of memory, and
- the number of calls to 'free' that attempted to free garbage
- (e.g. by freeing the same block twice or freeing a garbled
- pointer).
-
- The third line shows the garbage collection status.
-
- The fourth line shows the number of calls to 'malloc' and 'free'
- that occurred with interrupts off. In normal situations these
- values should be zero.
-
- The fifth line shows the current setting of the interrupt buffer
- pool, its minimal value and the number of failed buffer requests.
-
-
- _________________________________________________________________
- memory threshold [<bytes>] Default: 8192
- _________________________________________________________________
- Display or set the memory threshold size in bytes.
-
- If available memory falls below this value, no more new sessions
- are started or accepted.
-
- >> Example: memory threshold 4096
-