Python internals

Improving Python's Memory Allocator
Stepping Through CPython
Why Python is Slow: Looking Under the Hood
Python’s Innards

Eli Bendersky's - Python internals
Питон изнутри. Введение (Python’s Innards)


http://pythoninternal.wordpress.com/

Видео с Minsk Python Meetup

Read auxv

LD_SHOW_AUXV=1 /bin/true

or

Elfutils

https://access.redhat.com/site/documentation/en-US/Red_Hat_Developer_Toolset/1/html/User_Guide/chap-elfutils.html

sudo apt-get install elfutils
eu-readelf --all /lib/x86_64-linux-gnu/libc.so.6

gcc dumpspecs

gcc -dumpspecs
# ...
# *startfile:
# %{!mandroid|tno-android-ld:%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}    crti.o%s # %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s};:%{shared: crtbegin_so%O%s;:  %{static: crtbegin_static%O%s;: crtbegin_dynamic%O%s}}}
# ...

http://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Spec-Files.html#Spec-Files

ld --verbose
#...
# OUTPUT_ARCH(i386:x86-64)
# ENTRY(_start)
# SEARCH_DIR("/usr/x86_64-linux-gnu/lib64"); SEARCH_DIR("=/usr/local/lib/x86_64-linux-gnu"); SEARCH_DIR("=/usr/local/lib64"); SEARCH_DIR("=/lib/x86_64-linux-gnu"); SEARCH_DIR("=/lib64"); SEARCH_DIR("=/usr/lib/x86_64-linux-gnu"); SEARCH_DIR("=/usr/lib64"); SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib"); # SEARCH_DIR("=/usr/lib");
SECTIONS
# ...

https://sourceware.org/binutils/docs/ld/

Core dump

Allow core dump
Permanent:

sudo vi /etc/security/limits.conf
#add line
#YOUR_USERNAME     soft    core            1000000

Temporary:

ulimit -c unlimited

Core dump

sleep 30
# Type Control-\
Quit (core dumped)

kill -ABRT <PID>
# 11602 abort (core dumped)

In C

abort()

Core dump misc

cat /proc/sys/kernel/core_pattern
man 5 core
cat /proc/PID/coredump_filter

Software architecture design principles

GRASP - General Responsibility Assignment Software Patterns (or Principles) consists of guidelines for assigning responsibility to classes and objects in object-oriented design. The different patterns and principles used in GRASP are: Controller, Creator, Indirection, Information Expert, High Cohesion, Low Coupling, Polymorphism, Protected Variations, and Pure Fabrication.
SOLID (ru)
KISS Keep it simple, stupid
DRY Don't repeat yourself
YAGNI You aren't gonna need it
Worse is better
Law of Demeter, LoD Each unit should have only limited knowledge about other units: only units "closely" related to the current unit. Each unit should only talk to its friends; don't talk to strangers. Only talk to your immediate friends.

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