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63 lines
1.8 KiB
63 lines
1.8 KiB
=======================
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Low memory environments
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=======================
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One important portability target are low memory environments. The default
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Duktape options are quite memory conservative, and significant Ecmascript
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programs can be executed with, say, 1 megabyte of memory. Currently realistic
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memory targets are roughly:
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* 256kB flash memory (code) and 256kB system RAM
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- Duktape compiled with default options is feasible
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* 256kB flash memory (code) and 128kB system RAM
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- Duktape feature options are needed to reduce memory usage
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- A custom memory allocation with manually tuned pools may be required
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- Only very small programs can currently be executed
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This document describes suggested feature options for reducing Duktape
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memory usage for memory-constrained environments.
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Suggested feature options
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=========================
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* Use the default memory management settings: although reference counting
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increases heap header size, it also reduces memory usage fluctuation
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which is often more important than absolute footprint.
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* Reduce error handling footprint with one or more of:
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- ``DUK_OPT_NO_AUGMENT_ERRORS``
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- ``DUK_OPT_NO_TRACEBACKS``
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- ``DUK_OPT_NO_VERBOSE_ERRORS``
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- ``DUK_OPT_NO_PC2LINE``
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* If you don't need the Duktape-specific additional JX/JC formats, use:
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- ``DUK_OPT_NO_JX``
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- ``DUK_OPT_NO_JC``
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* Features borrowed from Ecmascript E6 can usually be disabled:
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- ``DUK_OPT_NO_ES6_OBJECT_SETPROTOTYPEOF``
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- ``DUK_OPT_NO_ES6_OBJECT_PROTO_PROPERTY``
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- ``DUK_OPT_NO_ES6_PROXY``
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* If you don't need regexp support, use:
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- ``DUK_OPT_NO_REGEXP_SUPPORT``.
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* Duktape debug code uses a large, static temporary buffer for formatting
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debuglog lines. Use e.g. the following to reduce this overhead:
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- ``-DDUK_OPT_DEBUG_BUFSIZE=2048``
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