sluggish start time; files created in pwd

[Crusader Ky]

Hi,
I'm running this hello world:

#!/usr/bin/env python

import cffi
ffi = cffi.FFI()
ffi.cdef(r"""
    void hello();
""")
C = ffi.verify(r"""
    #include <stdio.h>
    void hello(void) {
        printf("Hello world!\n");
    }
""")

if __name__ == '__main__':
    C.hello()

On Ubuntu 14.04, Python 2.7.6, pycparser 2.10, CFFI 0.8.2,
it takes 200ms for the first run and 45ms for the subsequent ones,
and it creates .__pycache__ under $HOME/.

On my office environment, RedHat 5, Python 2.6.2 installed in a custom location, pycparser 2.10 and CFFI 0.8.6 (both built from sources and installed in a custom location),
it takes 2s on the first run and 1.5s for the subsequent ones thereafter,
and it creates .__pycache__, yacctab.py and lextab.py in the current directory.

This is how I build them:

tar -xzf pycparser-release_v2.10.tar.gz
cd pycparser-release_v2.10
python setup.py --prefix=/my/custom/root
cd ..

tar -xzf cffi-0.8.6.tar.gz
cd cffi-0.8.6
python setup.py --prefix=/my/custom/root
cd ..


Thanks in advance

[Armin Rigo]

Hi,

On 18 December 2014 at 15:41, Crusader Ky <crusa...@gmail.com> wrote:
> On my office environment, RedHat 5, Python 2.6.2 installed in a custom
> location, pycparser 2.10 and CFFI 0.8.6 (both built from sources and
> installed in a custom location),
> it takes 2s on the first run and 1.5s for the subsequent ones thereafter,
> and it creates .__pycache__, yacctab.py and lextab.py in the current
> directory.

This is due to a misinstalled ``pycparser``. It is not finding its
precomputed C yacc and lex files, and so it creates them afresh in the
current directory. I'm not 100% sure how a correctly-installed
pycparser should look like, but I suggest that you do ``pip install
cffi`` (which will do ``pip install pycparser``) if possible, or if
not, try to figure out what's different in your pycparser installation
when compared against the machine where it works.


A bientôt,

Armin.

[Crusader Ky]

Fixed

tar -xzf pycparser-release_v2.10.tar.gz
cd pycparser-release_v2.10

cd pycparser/
python _build_tables.py
cd ..
python setup.py install --prefix=/my/custom/root
cd ..