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Re: The speed of zsh

X-seq: zsh-workers 2067
From: Zoltan Hidvegi <hzoli@xxxxxxxxxx>
To: schaefer@xxxxxxx
Subject: Re: The speed of zsh
Date: Sun, 25 Aug 1996 02:12:45 +0200 (MET DST)
Cc: zsh-workers@xxxxxxxxxxxxxxx
In-reply-to: <960824141541.ZM453@xxxxxxxxxxxxxxxxxxxxxxx> from Bart Schaefer at "Aug 24, 96 02:15:41 pm"
Organization: Dept. of Comp. Sci., Eotvos University, Budapest, Hungary
Phone: (36 1)2669833 ext: 2667, home phone: (36 1) 2752368

> } The patch below improves zsh preformance by 10-15%.  An other 10% speed
> } improvement would be possible by avoiding the
> } child_block()/child_unblock() calls whenever possible (other shells do not
> } use any system calls while executing builtin-only scritpts).
> 
> I think I said before that we could avoid those if we aren't going to fork
> and if the job table is empty.  Maybe they're expensive enough to be worth
> the extra test.  On what do you base the 10% figure?

Because zsh time is 26.11s+3.00s, 94% CPU, 30.659 total while ksh is
9.99s+0.00s, 93% CPU, 10.674 total for 9999 bottles of beer.

It's clear that zsh spends 10% of the time in system calls and the only
system call used by zsh while executing non-forking builtin-only scripts is
sigprocmask (which can be easily seen using strace).

Zoltan

References:
- Re: The speed of zsh
  - From: Bart Schaefer

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