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Full Discussion: Display-performance in terminal, bash or python?
Top Forums Shell Programming and Scripting Display-performance in terminal, bash or python? Post 302905446 by Corona688 on Wednesday 11th of June 2014 03:07:40 PM
Old 06-11-2014
Let's see the difference between what bash and python do when you tell them to do nothing:

Code:
$ strace bash 2>&1 </dev/null | grep "^open"

open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libreadline.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libncurses.so.5", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/dev/tty", O_RDWR|O_NONBLOCK)     = 3
open("/usr/lib64/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
open("/proc/meminfo", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3

$ strace python 2>&1 </dev/null | grep "^open"

open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/etc/env.d/python/config", O_RDONLY) = 3
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/libpython3.3.so.1.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libutil.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib64/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3
open("/dev/urandom", O_RDONLY)          = 3
open("/usr/bin/pyvenv.cfg", O_RDONLY)   = -1 ENOENT (No such file or directory)
open("/usr/pyvenv.cfg", O_RDONLY)       = -1 ENOENT (No such file or directory)
open("/proc/meminfo", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3/", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/lib64/python3.3/encodings/__pycache__/__init__.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/codecs.cpython-33.pyc", O_RDONLY) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3/encodings", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/lib64/python3.3/encodings/__pycache__/aliases.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/encodings/__pycache__/utf_8.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/encodings/__pycache__/latin_1.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/io.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/abc.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/_weakrefset.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/locale.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/re.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/sre_compile.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/sre_parse.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/sre_constants.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/functools.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/collections/__pycache__/__init__.cpython-33.pyc", O_RDONLY) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3/collections", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/lib64/python3.3/collections/__pycache__/abc.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/keyword.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/heapq.cpython-33.pyc", O_RDONLY) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3/plat-linux", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3/lib-dynload", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/lib64/python3.3/lib-dynload/_heapq.cpython-33.so", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib64/python3.3/__pycache__/weakref.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/reprlib.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/copyreg.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/site.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/os.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/stat.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/posixpath.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/genericpath.cpython-33.pyc", O_RDONLY) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/lib64/python3.3/__pycache__/sysconfig.cpython-33.pyc", O_RDONLY) = 3
open("/usr/lib64/python3.3/__pycache__/_sysconfigdata.cpython-33.pyc", O_RDONLY) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3/site-packages", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/usr/lib64/python3.3/site-packages", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3

$

Python is a much bigger language -- it has to do a whole lot more to load than BASH. That doesn't mean it's slow once it's actually loaded... See how long either language takes to print 100,000 lines. I bet they'd be close to the same (since it's mostly going to be limited by I/O speed).

Python would be much better than BASH because Python will probably let you use the ncurses console library. That alone would probably make it faster for your needs -- replacing a lot of cumbersome things with simple calls.
 

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