Echelon LonTal Stack - Manual (Page 206)

194 Appendix E: Appendix E
Determining Memory Usage for LonTalk
Stack Applications
Overview
The LonTalk Host stack allocates memory dynamically, so a direct measurement
of the memory usage might lead to an underestimate for memory usage,
especially for peak usage conditions. This appendix provides both static code
analysis and runtime measurements so that you can calculate more reliable
memory usage estimates.
Memory Use for Code
The following table lists the estimated memory required for the LonTalk Stack
code. The values will vary depending on the processor, operating system, and
compiler that you use.
Code Type Bytes Required
Native LonTalk protocol stack and
LonTalk API 750 KB
IP-852 LonTalk protocol stack and
LonTalk API
855 KB
Native LonTalk to IP-852 Router 880 KB
Serial MIP driver 70 KB
SimpleDevice and SimpleIp852Device
example applications
30 KB
Ip852Router example application 15 KB
Memory Use for Transactions
The LonTalk host stack allocates memory for transactions at runtime, as they are
needed. On the Stack Configuration page of the LonTalk Interface Developer
utility, you can specify maximum allowed values for the number of simultaneous
receive transactions and for the number of simultaneous transmit transactions.
These values limit the amount of memory that the LonTalk host stack allocates
for transactions.
The following table lists the estimated amount of memory required for each type
of transaction. .
Transaction Type Bytes Required
Transmit transaction 196
Receive transaction 400