zsh-users
 help / color / mirror / code / Atom feed
From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
To: Zsh Users <zsh-users@zsh.org>
Subject: One glob (*cbp) slow, other (*1000) fast, why?
Date: Thu, 8 Sep 2016 10:47:48 +0200	[thread overview]
Message-ID: <CAKc7PVCX0zW_bXncdrjZ37nQ4NtYHPpbP6AgCaZxm=gV7F6GuA@mail.gmail.com> (raw)

[-- Attachment #1: Type: text/plain, Size: 689 bytes --]

Hello,
on a directory with 80000 files (result of touch {1..2000} {1..2000}{a..c})
I do:

typeset -F SECONDS; myst=$SECONDS; tmp=( *cbp(NY1) ); echo $(( (SECONDS -
myst) * 1000 ))

it returns: 80.449999999927968

then I do:

typeset -F SECONDS; myst=$SECONDS; tmp=( *1000(NY1) ); echo $(( (SECONDS -
myst) * 1000 ))

it returns: 0.15299999995477265

Why such a difference?


More:

typeset -F SECONDS; myst=$SECONDS; tmp=( *10000(NY1) ); echo $(( (SECONDS -
myst) * 1000 ))
0.2779999999802385
typeset -F SECONDS; myst=$SECONDS; tmp=( *100000(NY1) ); echo $(( (SECONDS
- myst) * 1000 ))
78.060000000277796

I.e. it starts to be slow at 5 or more zeros.

Best regards,
Sebastian Gniazdowski

             reply	other threads:[~2016-09-08 10:41 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-08  8:47 Sebastian Gniazdowski [this message]
2016-09-08  9:06 ` Sebastian Gniazdowski

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAKc7PVCX0zW_bXncdrjZ37nQ4NtYHPpbP6AgCaZxm=gV7F6GuA@mail.gmail.com' \
    --to=sgniazdowski@gmail.com \
    --cc=zsh-users@zsh.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this public inbox

	https://git.vuxu.org/mirror/zsh/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).