Re: Double the speed of ct-ng with CONFIG_SHELL=/bin/ash

["Yann E. MORIN" <yann dot morin dot 1998 at anciens dot enib dot fr>]

Hello Martin!
Hello All!

On Monday 25 August 2008 23:01:15 Martin Guy wrote:
> >  This gives an improvement in speed of about 6% here:
> >   CONFIG_SHELL not set:         26'47.81"
> >   CONFIG_SHELL set to /bin/ash: 25'11.60"
> Strange. What's your box?
> My measurements were on a 2x2GHz 32-bit AMD under Debian etch with 1GB
> RAM (so hard disk speed was not an issue - everything was in cache)
> using -j3 and with

Core-2 Quad @ 2.83GHz with 4GiB RAM running in 64-bit. Sorry... :-)
Debian Lenny as of this morning, and using -j10 (to hog the CPU).

> /bin/sh -> bash (so the login shell and $SHELL were /bin/bash)
> CONFIG_SHELL=/bin/ash ./ct-ng build

Same here.

The time quoted previously was to build a full toolchain:
  arm-unknown-linux-uclibcgnueabi  (local)
    OS        : linux-2.6.26.1
    GMP/MPFR  : gmp-4.2.2 / mpfr-2.3.1
    binutils  : binutils-2.18.50.0.8
    C compiler: gcc-4.3.1 (C,C++,Fortran,Java)
    C library : uClibc-20080801
    Tools     : sstrip dmalloc-5.5.2 duma-2_5_14 gdb-6.8 strace-4.5.16

As for the sole GMP build, it went about 30% faster, from 35" down to 24".
I will collect more data tomorow.

> I was seeing 50% system time and 50% user time,

I didn't pay attention too closely at user time vs. system time...
Will look more closely next time...

Regards,
Yann E. MORIN.

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