diff options
| author | Damien George | 2019-02-25 23:15:51 +1100 |
|---|---|---|
| committer | Damien George | 2019-03-05 16:25:07 +1100 |
| commit | 5996eeb48fa6ce773003eacbc7e0b52ad5cc4d31 (patch) | |
| tree | b5a1fe800073108d5da9abf84c59aa5387ec537e /tests/import | |
| parent | 5a2599d96299ad37cda954f1de345159f9acf11c (diff) | |
py/persistentcode: Add a qstr window to save mpy files more efficiently.
This is an implementation of a sliding qstr window used to reduce the
number of qstrs stored in a .mpy file. The window size is configured to 32
entries which takes a fixed 64 bytes (16-bits each) on the C stack when
loading/saving a .mpy file. It allows to remember the most recent 32 qstrs
so they don't need to be stored again in the .mpy file. The qstr window
uses a simple least-recently-used mechanism to discard the least recently
used qstr when the window overflows (similar to dictionary compression).
This scheme only needs a single pass to save/load the .mpy file.
Reduces mpy file size by about 25% with a window size of 32.
Diffstat (limited to 'tests/import')
| -rw-r--r-- | tests/import/mpy_invalid.py | 1 | ||||
| -rw-r--r-- | tests/import/mpy_invalid.py.exp | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/tests/import/mpy_invalid.py b/tests/import/mpy_invalid.py index 6a4e116e7..6e9cbc9db 100644 --- a/tests/import/mpy_invalid.py +++ b/tests/import/mpy_invalid.py @@ -48,6 +48,7 @@ user_files = { '/mod0.mpy': b'', # empty file '/mod1.mpy': b'M', # too short header '/mod2.mpy': b'M\x00\x00\x00', # bad version + '/mod3.mpy': b'M\x00\x00\x00\x7f', # qstr window too large } # create and mount a user filesystem diff --git a/tests/import/mpy_invalid.py.exp b/tests/import/mpy_invalid.py.exp index 1727ea1ce..ea748ff6c 100644 --- a/tests/import/mpy_invalid.py.exp +++ b/tests/import/mpy_invalid.py.exp @@ -1,3 +1,4 @@ mod0 ValueError incompatible .mpy file mod1 ValueError incompatible .mpy file mod2 ValueError incompatible .mpy file +mod3 ValueError incompatible .mpy file |