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Showing posts from June, 2017

Python is SLOW - How to speed it up - 1

Python is slow.  For most cases this doesn't really matter as the development time is more of a factor. However on low CPU power devices (phones) anything is significant. First tip on how to speed up python, is to use Atom !  Just install with pip.  Atom speeds up object creation by about 50% per property (ex an object with 4 properties is about 2x faster, 8 properties 4x, etc...) . I've seen significant performance increases simply by switching in my testing. See the simple example below: from atom.api import Atom, ForwardInstance, Callable, Unicode, Tuple, Bool, Int, Instance, set_default, Property class TestAtom(Atom): i = Int(1) a = Unicode("abc") b = Tuple(default=(1,2,3)) c = Bool() f = Callable(default=lambda: "test") class TestObj(object): def __init__(self): self.i = 1 self.a = 'abc' self.b = (1,2,3) self.c = False self.f = lambda: "test" %timeit

Debugging a crash in a python native library on Android (ex, kivy)

I'm trying to debug a crash in a python extension (cythonized) from pyjnius. The crash signature is as follows: 06-05 18:41:46.111 3631-3631/com.jventura.pyapp I/System.out: + java:invoke( , public abstract void android.text.TextWatcher.beforeTextChanged(java.lang.CharSequence,int,int,int), [Ljava.lang.Object;@c30cd5c) 06-05 18:41:46.113 3631-3631/com.jventura.pyapp I/pybridge: beforeTextChanged called 06-05 18:41:46.114 3631-3631/com.jventura.pyapp A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 3631 (.jventura.pyapp) [ 06-05 18:41:46.114 151: 151 W/ ] debuggerd: handling request: pid=3631 uid=10103 gid=10103 tid=3631 06-05 18:41:46.112 4374-4374/? W/debuggerd: type=1400 audit(0.0:1696): avc: denied { search } for name="com.jventura.pyapp" dev="dm-0" ino=130503 sco