Comments (10)
rm-hull
commented on May 23, 2024
I'm on holiday at the moment, so can't immediately try anything. You could try running the python profiler, by adding -m cProfile to the python command line. See here for an example: http://stackoverflow.com/questions/582336/how-can-you-profile-a-python-script
And paste the results as a new comment.
from luma.oled.
musskopf
commented on May 23, 2024
Thanks for replying during your holidays! I've noticed that some of the CPU is because of the program loading, but still some load after everything is running.
Here the trace from the demo.py, I just modified the code to loop 5 times the with canvas(device) as draw:
(oledEnv)mike@localhost~/ssd1306/examples $ time python -m cProfile demoLoop5.py
11110 function calls (11089 primitive calls) in 1.561 seconds
Ordered by: standard name
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 0.000 0.000 BmpImagePlugin.py:202(DibImageFile)
1 0.011 0.011 0.020 0.020 BmpImagePlugin.py:27(<module>)
6 0.000 0.000 0.000 0.000 BmpImagePlugin.py:56(_accept)
1 0.000 0.000 0.000 0.000 BmpImagePlugin.py:63(BmpImageFile)
1 0.005 0.005 0.048 0.048 FixTk.py:1(<module>)
1 0.006 0.006 0.007 0.007 GifImagePlugin.py:27(<module>)
6 0.000 0.000 0.000 0.000 GifImagePlugin.py:44(_accept)
1 0.000 0.000 0.000 0.000 GifImagePlugin.py:52(GifImageFile)
5 0.000 0.000 0.001 0.000 Image.py:1133(getdata)
1 0.000 0.000 0.000 0.000 Image.py:1966(_ImageCrop)
1 0.000 0.000 0.000 0.000 Image.py:2002(ImagePointHandler)
1 0.000 0.000 0.000 0.000 Image.py:2007(ImageTransformHandler)
5 0.001 0.000 0.003 0.001 Image.py:2024(new)
6 0.000 0.000 0.000 0.000 Image.py:2250(_decompression_bomb_check)
6 0.002 0.000 0.106 0.018 Image.py:2264(open)
6 0.000 0.000 0.001 0.000 Image.py:2436(register_open)
5 0.000 0.000 0.000 0.000 Image.py:2451(register_mime)
6 0.000 0.000 0.000 0.000 Image.py:2462(register_save)
1 0.000 0.000 0.000 0.000 Image.py:2473(register_save_all)
12 0.000 0.000 0.001 0.000 Image.py:2485(register_extension)
1 0.038 0.038 0.176 0.176 Image.py:27(<module>)
1 0.000 0.000 0.000 0.000 Image.py:34(DecompressionBombWarning)
6 0.013 0.002 0.088 0.015 Image.py:343(preinit)
1 0.000 0.000 0.000 0.000 Image.py:38(_imaging_not_installed)
6 0.000 0.000 0.001 0.000 Image.py:406(_getdecoder)
1 0.000 0.000 0.000 0.000 Image.py:447(_E)
1 0.001 0.001 0.001 0.001 Image.py:482(Image)
16 0.001 0.000 0.001 0.000 Image.py:496(__init__)
5 0.001 0.000 0.001 0.000 Image.py:516(_new)
23 0.001 0.000 0.001 0.000 Image.py:623(__getattr__)
22 0.001 0.000 0.001 0.000 Image.py:760(load)
1 0.000 0.000 0.000 0.000 ImageChops.py:18(<module>)
1 0.001 0.001 0.001 0.001 ImageColor.py:20(<module>)
45 0.003 0.000 0.007 0.000 ImageDraw.py:138(_getink)
5 0.001 0.000 0.011 0.002 ImageDraw.py:191(ellipse)
10 0.001 0.000 0.002 0.000 ImageDraw.py:201(line)
5 0.000 0.000 0.002 0.000 ImageDraw.py:239(polygon)
10 0.001 0.000 0.004 0.000 ImageDraw.py:249(rectangle)
15 0.000 0.000 0.001 0.000 ImageDraw.py:259(_multiline_check)
15 0.003 0.000 0.007 0.000 ImageDraw.py:269(text)
1 0.003 0.003 0.004 0.004 ImageDraw.py:33(<module>)
5 0.001 0.000 0.003 0.001 ImageDraw.py:345(Draw)
1 0.000 0.000 0.000 0.000 ImageDraw.py:50(ImageDraw)
5 0.001 0.000 0.001 0.000 ImageDraw.py:62(__init__)
6 0.005 0.001 0.014 0.002 ImageFile.py:130(load)
6 0.000 0.000 0.001 0.000 ImageFile.py:262(load_prepare)
1 0.000 0.000 0.000 0.000 ImageFile.py:284(StubImageFile)
1 0.005 0.005 0.005 0.005 ImageFile.py:30(<module>)
1 0.000 0.000 0.000 0.000 ImageFile.py:314(Parser)
6 0.000 0.000 0.000 0.000 ImageFile.py:506(_safe_read)
6 0.000 0.000 0.000 0.000 ImageFile.py:66(_tilesort)
1 0.000 0.000 0.000 0.000 ImageFile.py:75(ImageFile)
6 0.001 0.000 0.014 0.002 ImageFile.py:78(__init__)
1 0.000 0.000 0.000 0.000 ImageFont.py:121(FreeTypeFont)
1 0.000 0.000 0.000 0.000 ImageFont.py:194(TransposedFont)
1 0.009 0.009 0.010 0.010 ImageFont.py:28(<module>)
6 0.006 0.001 0.143 0.024 ImageFont.py:326(load_default)
1 0.000 0.000 0.000 0.000 ImageFont.py:39(_imagingft_not_installed)
1 0.000 0.000 0.000 0.000 ImageFont.py:65(ImageFont)
6 0.002 0.000 0.017 0.003 ImageFont.py:88(_load_pilfont_data)
1 0.001 0.001 0.001 0.001 ImageMode.py:17(<module>)
1 0.000 0.000 0.000 0.000 ImageMode.py:23(ModeDescriptor)
1 0.003 0.003 0.004 0.004 ImagePalette.py:19(<module>)
1 0.000 0.000 0.000 0.000 ImagePalette.py:24(ImagePalette)
1 0.001 0.001 0.001 0.001 ImageSequence.py:19(<module>)
1 0.000 0.000 0.000 0.000 ImageSequence.py:19(Iterator)
6 0.000 0.000 0.000 0.000 JpegImagePlugin.py:274(_accept)
1 0.000 0.000 0.000 0.000 JpegImagePlugin.py:281(JpegImageFile)
1 0.007 0.007 0.017 0.017 JpegImagePlugin.py:35(<module>)
1 0.000 0.000 0.000 0.000 JpegPresets.py:67(<module>)
12 0.001 0.000 0.002 0.000 PngImagePlugin.py:104(read)
6 0.000 0.000 0.000 0.000 PngImagePlugin.py:122(close)
12 0.001 0.000 0.005 0.000 PngImagePlugin.py:129(call)
6 0.001 0.000 0.002 0.000 PngImagePlugin.py:136(crc)
1 0.000 0.000 0.000 0.000 PngImagePlugin.py:167(iTXt)
1 0.000 0.000 0.000 0.000 PngImagePlugin.py:187(PngInfo)
1 0.000 0.000 0.000 0.000 PngImagePlugin.py:264(PngStream)
6 0.001 0.000 0.001 0.000 PngImagePlugin.py:266(__init__)
6 0.001 0.000 0.002 0.000 PngImagePlugin.py:310(chunk_IHDR)
6 0.000 0.000 0.000 0.000 PngImagePlugin.py:325(chunk_IDAT)
1 0.009 0.009 0.023 0.023 PngImagePlugin.py:34(<module>)
6 0.000 0.000 0.000 0.000 PngImagePlugin.py:476(_accept)
1 0.000 0.000 0.000 0.000 PngImagePlugin.py:483(PngImageFile)
6 0.002 0.000 0.013 0.002 PngImagePlugin.py:488(_open)
6 0.001 0.000 0.001 0.000 PngImagePlugin.py:549(load_prepare)
6 0.000 0.000 0.001 0.000 PngImagePlugin.py:557(load_read)
6 0.000 0.000 0.001 0.000 PngImagePlugin.py:583(load_end)
1 0.000 0.000 0.000 0.000 PngImagePlugin.py:626(_idat)
1 0.000 0.000 0.000 0.000 PngImagePlugin.py:94(ChunkStream)
6 0.000 0.000 0.000 0.000 PngImagePlugin.py:96(__init__)
1 0.002 0.002 0.008 0.008 PpmImagePlugin.py:18(<module>)
6 0.000 0.000 0.000 0.000 PpmImagePlugin.py:52(_accept)
1 0.000 0.000 0.000 0.000 PpmImagePlugin.py:59(PpmImageFile)
6 0.000 0.000 0.000 0.000 TiffImagePlugin.py:221(_accept)
1 0.000 0.000 0.000 0.000 TiffImagePlugin.py:228(ImageFileDirectory)
1 0.005 0.005 0.009 0.009 TiffImagePlugin.py:42(<module>)
1 0.000 0.000 0.000 0.000 TiffImagePlugin.py:630(TiffImageFile)
1 0.000 0.000 0.000 0.000 UserDict.py:18(__getitem__)
3 0.000 0.000 0.000 0.000 UserDict.py:58(get)
3 0.000 0.000 0.000 0.000 UserDict.py:70(__contains__)
1 0.000 0.000 0.000 0.000 __future__.py:48(<module>)
1 0.000 0.000 0.000 0.000 __future__.py:74(_Feature)
7 0.000 0.000 0.000 0.000 __future__.py:75(__init__)
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1 0.000 0.000 0.000 0.000 __init__.py:14(<module>)
14 0.002 0.000 0.003 0.000 __init__.py:147(_check_size)
1 0.000 0.000 0.000 0.000 __init__.py:159(py_object)
1 0.000 0.000 0.000 0.000 __init__.py:168(c_short)
1 0.000 0.000 0.000 0.000 __init__.py:172(c_ushort)
1 0.000 0.000 0.000 0.000 __init__.py:176(c_long)
1 0.000 0.000 0.000 0.000 __init__.py:180(c_ulong)
1 0.000 0.000 0.000 0.000 __init__.py:197(c_float)
1 0.000 0.000 0.000 0.000 __init__.py:201(c_double)
1 0.000 0.000 0.000 0.000 __init__.py:205(c_longdouble)
1 0.000 0.000 0.000 0.000 __init__.py:215(c_longlong)
1 0.000 0.000 0.000 0.000 __init__.py:219(c_ulonglong)
1 0.000 0.000 0.000 0.000 __init__.py:226(c_ubyte)
1 0.000 0.000 0.000 0.000 __init__.py:233(c_byte)
1 0.000 0.000 0.000 0.000 __init__.py:238(c_char)
1 0.000 0.000 0.000 0.000 __init__.py:243(c_char_p)
1 0.000 0.000 0.000 0.000 __init__.py:255(c_void_p)
1 0.000 0.000 0.000 0.000 __init__.py:260(c_bool)
1 0.001 0.001 0.003 0.003 __init__.py:265(_reset_cache)
1 0.000 0.000 0.000 0.000 __init__.py:291(c_wchar_p)
1 0.000 0.000 0.000 0.000 __init__.py:294(c_wchar)
1 0.000 0.000 0.000 0.000 __init__.py:3(<module>)
1 0.000 0.000 0.000 0.000 __init__.py:332(CDLL)
1 0.001 0.001 0.001 0.001 __init__.py:349(__init__)
1 0.000 0.000 0.000 0.000 __init__.py:359(_FuncPtr)
1 0.000 0.000 0.000 0.000 __init__.py:388(PyDLL)
1 0.029 0.029 0.042 0.042 __init__.py:4(<module>)
1 0.000 0.000 0.000 0.000 __init__.py:428(LibraryLoader)
2 0.000 0.000 0.000 0.000 __init__.py:429(__init__)
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24 0.001 0.000 0.001 0.000 _binary.py:56(i32be)
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70 0.001 0.000 0.003 0.000 _util.py:4(isStringType)
12 0.000 0.000 0.001 0.000 _util.py:7(isPath)
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12 0.000 0.000 0.001 0.000 _weakrefset.py:20(__enter__)
12 0.001 0.000 0.001 0.000 _weakrefset.py:26(__exit__)
38 0.003 0.000 0.003 0.000 _weakrefset.py:36(__init__)
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24 0.001 0.000 0.003 0.000 _weakrefset.py:58(__iter__)
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1 0.000 0.000 0.000 0.000 collections.py:395(Counter)
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1 0.000 0.000 0.000 0.000 device.py:149(ssd1306)
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1 0.000 0.000 0.000 0.000 device.py:210(const)
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1 0.000 0.000 0.000 0.000 device.py:56(device)
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1 0.000 0.000 0.000 0.000 render.py:56(canvas)
5 0.000 0.000 0.003 0.001 render.py:62(__init__)
5 0.000 0.000 0.003 0.001 render.py:67(__enter__)
5 0.003 0.001 1.117 0.223 render.py:71(__exit__)
166 0.022 0.000 0.607 0.004 smbus.py:261(write_i2c_block_data)
1 0.014 0.014 0.016 0.016 smbus.py:27(<module>)
166 0.050 0.000 0.052 0.000 smbus.py:296(list_to_smbus_data)
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1 0.000 0.000 0.000 0.000 smbus.py:54(__init__)
1 0.000 0.000 0.000 0.000 smbus.py:71(open)
166 0.002 0.000 0.002 0.000 smbus.py:85(_set_addr)
5 0.000 0.000 0.001 0.000 sre_compile.py:228(_compile_charset)
5 0.001 0.000 0.001 0.000 sre_compile.py:256(_optimize_charset)
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4 0.000 0.000 0.000 0.000 {method 'endswith' of 'str' objects}
5 0.000 0.000 0.000 0.000 {method 'find' of 'bytearray' objects}
18 0.000 0.000 0.000 0.000 {method 'get' of 'dict' objects}
15 0.002 0.000 0.002 0.000 {method 'getmask' of 'ImagingFont' objects}
1 0.000 0.000 0.000 0.000 {method 'index' of 'str' objects}
16 0.000 0.000 0.000 0.000 {method 'items' of 'dict' objects}
3 0.000 0.000 0.000 0.000 {method 'join' of 'str' objects}
1 0.000 0.000 0.000 0.000 {method 'keys' of 'dict' objects}
12 0.000 0.000 0.000 0.000 {method 'lower' of 'str' objects}
12 0.000 0.000 0.000 0.000 {method 'match' of '_sre.SRE_Pattern' objects}
166 0.004 0.000 0.004 0.000 {method 'new' of 'CompiledFFI' objects}
16 0.000 0.000 0.000 0.000 {method 'pixel_access' of 'ImagingCore' objects}
6 0.000 0.000 0.000 0.000 {method 'pop' of 'dict' objects}
54 0.001 0.000 0.001 0.000 {method 'read' of '_io.BytesIO' objects}
18 0.000 0.000 0.000 0.000 {method 'readline' of '_io.BytesIO' objects}
12 0.000 0.000 0.000 0.000 {method 'remove' of 'set' objects}
3 0.000 0.000 0.000 0.000 {method 'replace' of 'str' objects}
18 0.000 0.000 0.000 0.000 {method 'seek' of '_io.BytesIO' objects}
6 0.000 0.000 0.000 0.000 {method 'setimage' of 'ImagingDecoder' objects}
1 0.000 0.000 0.000 0.000 {method 'setter' of 'property' objects}
7 0.000 0.000 0.001 0.000 {method 'sort' of 'list' objects}
11 0.000 0.000 0.000 0.000 {method 'split' of 'str' objects}
7 0.000 0.000 0.000 0.000 {method 'startswith' of 'str' objects}
12 0.000 0.000 0.000 0.000 {method 'tell' of '_io.BytesIO' objects}
4 0.000 0.000 0.000 0.000 {method 'translate' of 'str' objects}
30 0.000 0.000 0.000 0.000 {method 'upper' of 'str' objects}
18 0.000 0.000 0.000 0.000 {min}
28 0.000 0.000 0.000 0.000 {ord}
1 0.000 0.000 0.000 0.000 {posix.open}
2 0.000 0.000 0.000 0.000 {posix.stat}
2 0.000 0.000 0.000 0.000 {range}
1 0.000 0.000 0.000 0.000 {sorted}
real 0m2.961s
user 0m1.900s
sys 0m0.280s
From what I can see the 5 0.427 0.085 1.114 0.223 device.py:181(display) and the 166 0.523 0.003 0.523 0.003 {built-in method i2c_smbus_access} seems to be the big offenders.
As I can see every loop the whole image is sent to the OLED. I'm wondering if would be beneficial to keep the previous image in memory, perform some image logic operations (XOR?!) and send only the "delta" to the OLED. This way, if only a small portion of the "image" changes, only those pixels, or "pages" will get updated over I2C.
I'll see if I find some time to play with the Pillow tool and have a look on the datasheets to see if that's possible.
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rm-hull
commented on May 23, 2024
That definitely seems like a good idea. As far as I remember you can access individual pages and pixels on the device.
I'm away for a couple of weeks, so will look into it a bit more in september, but by all means go for it yourself & if I can help I will.
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musskopf
commented on May 23, 2024
Just an update... I got some reasonable performance improvement. The easiest one is to increase the I2C Baudrate on the RPI. To do that just add the following to the /boot/config.txt and restart (assuming you're using a recent version of Raspbian):
dtparam=i2c_arm=on
dtparam=i2c1_baudrate=400000
That's 400Khz, compared to the default 100Khz. I've tried to push to 1Mhz, it still works but there is no much performance gain and too fast might cause communication issues as not all I2C devices support 1Mhz.
The other change is to the code itself, I'll try to get a version to send here but I basically start using numpy library which boost the conversion from Image to array.
I also started printing things by "page", that's actually "lines of 8 bits". I've done some tests printing 8x8 pixels but after many attempts I noticed that there is too much overhead just to put the cursor on the right position and the profiler start to show some delays.
The idea is basically to compare the previous image (numpy array) with the new one and "print" only the modified lines. If you just change one or two lines, things are really fast!
The test code below is basically displaying 10 images in 0.8s (after loading all libs) on my RPI B+. The optimization prints only 60 lines instead of printing 80 lines (each image has 8 lines of 8 pixels each), that's the "delta per line".
Be aware that you'll need numpy to use it... I compile myself as I don't use the stock Python and it takes more than one hours on RPI.
import smbus
import numpy as np
from PIL import Image, ImageDraw, ImageFont
import time
import cProfile, pstats, StringIO
pr = cProfile.Profile()
lookup = np.array([
0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
])
port = 1
addr = 0x3C
cmd_reg = 0x00
data_reg = 0x40
bus = smbus.SMBus(port)
# Set page number
setPageCounter = 0
def setPage(page, endPage=0):
# write CMD
cmd = [0x22, page, page + endPage]
bus.write_i2c_block_data(addr, cmd_reg, cmd)
global setPageCounter
setPageCounter += 1
# Set Start and End column number.
setColCounter = 0
def setCol(col, endCol=127):
# write CMD
cmd = [0x21, col, col + endCol]
bus.write_i2c_block_data(addr, cmd_reg, cmd)
global setColCounter
setColCounter += 1
# write DATA
writeCounter = 0
def writeData(data):
global writeCounter
for x in np.nditer(data, op_flags=['readwrite']):
x[...] = lookup[x]
data = data.flatten().tolist()
for i in xrange(0, len(data), 32):
bus.write_i2c_block_data(addr, data_reg, data[i:i+32])
writeCounter += 1
def draw(shape):
im = Image.new('L', (128, 64))
dr = ImageDraw.Draw(im)
if shape == 0:
pass
#blank image
if shape == 1:
dr.rectangle((0, 0, 120, 30), outline=0, fill=1)
if shape == 2:
dr = ImageDraw.Draw(im)
font = ImageFont.truetype('pixelmix.ttf', 8)
dr.text((50, 50), time.strftime("%X"), font=font, fill=1)
return np.asarray(im)
def printOled(current_data, new_data):
i = 0
write_page = None
last_page = 7
for row in new_data:
if not np.array_equal(current_data[0], row):
# We only set a new page if necessary. If it's a continuous write the page should increment itself.
if write_page != i:
setPage(i, last_page)
write_page = i
writeData(row)
write_page += 1
i += 1
def test(a, b):
da = np.packbits(a, axis=0)
db = np.packbits(b, axis=0)
diff = np.not_equal(a,b)
# Create a blank Image... that actually can be a first image, we just need something to compare with.
data_blank = np.packbits(draw(0), axis=0)
setCol(0)
pr.enable()
for i in range(0,5):
a = draw(1)
data_a = np.packbits(a, axis=0)
printOled(data_blank, data_a)
b = draw(2)
data_b = np.packbits(b, axis=0)
printOled(data_a, data_b)
# time.sleep(1);
#print 'Build a matrix of 8x8 bits. Lines X Columns'
#matrix = np.asarray(np.split(np.asarray(np.split(a, 2, axis=1)), 2, axis=1))
pr.disable()
s = StringIO.StringIO()
sortby = 'cumulative'
ps = pstats.Stats(pr, stream=s).sort_stats(sortby)
ps.print_stats()
print s.getvalue()
print 'SetPages: {} SetCols: {} Writes: {}'.format(setPageCounter, setColCounter, writeCounter)from luma.oled.
musskopf
commented on May 23, 2024
As you can see with numpy you can load the Image directly into the array... and also it has some very funky, but it doesn't require many changes apart from the bit order change using the lookup. One thing important to high light and I spent quite some time on is that numpy only accepts a 8bit image... if you try to load an 1bit image on it, the produce array is broken. In any case it still much faster than using the Image.getdata()
Cheers!
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musskopf
commented on May 23, 2024
Another update... I just got my RPi 2 and the same code which used to take 0.8s now takes 0.34s. I haven't recompiled anything, just plugged the SD card on the new RPi and was working!
The RPi 2 is really much faster! I'm running CAN Bus sending 1.3K msg/s + one ssd1306 refresh per second + RabbitMq and the system is around 92% IDLE....you can even notice on the SSH session that is more responsive and the tasks get well distributed across the 4 cores.
Well done Raspberry Pi team!
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rm-hull
commented on May 23, 2024
Hi, yeah the RPi2 is a lot faster: also the class of microSD card makes a big difference too - try class 10. I haven't really had chance to digest your earlier comments (even thoufh I've been back off hols for a few weeks now) - is there worth pulling anything out into the code to make it quicker?
I think when I wrote it originally, I assumed that as the screen is so small, keeping track of dirty writes and doing diffs would be more effort (both dev and CPU time) than just flushing everything to the screen. I willl have a fresh look into the profiling trace you attached.
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musskopf
commented on May 23, 2024
You can do a very simple thing that is use the numpy library, so you do
need to loop through the whole image array.
On 19 September 2015 at 00:30, Richard Hull [email protected]
wrote:
Hi, yeah the RPi2 is a lot faster: also the class of microSD card makes a
big difference too - try class 10. I haven't really had chance to digest
your earlier comments (even thoufh I've been back off hols for a few weeks
now) - is there worth pulling anything out into the code to make it quicker?I think when I wrote it originally, I assumed that as the screen is so
small, keeping track of dirty writes and doing diffs would be more effort
(both dev and CPU time) than just flushing everything to the screen. I
willl have a fresh look into the profiling trace you attached.—
Reply to this email directly or view it on GitHub
#8 (comment).
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thijstriemstra
commented on May 23, 2024
@musskopf optional support for numpy would be cool (if it makes things faster?)
from luma.oled.
rm-hull
commented on May 23, 2024
I dont really want to add numpy as a dependency.
Adding the following kernel params to /boot/config.txt makes an appreciable difference like @musskopf noted:
dtparam=i2c_arm=on
dtparam=i2c1_baudrate=400000
Today, I revisited the cProfile trace, and have pushed a new version (f82e1d3) which aggressively optimises the display method; it reduces the render time by a factor or two - down from ~63ms to about ~33ms (as measured on my RPi Zero, running at 800MHz).
I've only done the ssd1306 version at the moment and not the sh1106 driver - mainly because I dont have one of those. Need to implement some tests (see #33) before tackling that I think.
... In the meantime, I think this ticket should be closed & for any new perf-related issues/queries, please raise a new issue.
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