Re: /etc/group, /etc/passwd usage by cygwin layer ?

Re: /etc/group, /etc/passwd usage by cygwin layer ?

[jurgen.defurne]

Thanks,

I found out how to prune that file without loosing my needed information.

Jurgen










Corinna Vinschen <corinna-cygwin@cygwin.com>
Sent by: 
cygwin-owner@cygwin.com
01/09/2003 01:02 PM
Please respond to cygwin

 
        To:     cygwin@cygwin.com
        cc:     (bcc: Jurgen Defurne/BRG/CE/PHILIPS)
        Subject:        Re: /etc/group, /etc/passwd usage by cygwin layer ?
        Classification: 



On Thu, Jan 09, 2003 at 11:28:04AM +0100, jurgen.defurne@philips.com 
wrote:
> Hello,
> 
> Are the /etc/group and /etc/passwd files referenced much by cygwin while
> executing programs or doing file accesses ?

Yes, the content of both files is read into memory.  Cygwin needs the
information, especially name, u/gid and SID.

> The only thing I changed yesterday, was copying a new group file, 
created
> by mkgroup -d. This file is 1669895 bytes large (yes, that is 1.59 Mb), 
it
> contains 22080 group entries.

*gasp*

> Do you think this should be filed as a bug ?

It doesn't count as a bug but it's a well known problem since... well...
3 years or so.  It's way faster than it was back then but we still don't
have an optimal solution.

Workaround:  Don't use such big files.

Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
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Re: /etc/group, /etc/passwd usage by cygwin layer ?

[Corinna Vinschen]

On Thu, Jan 09, 2003 at 11:28:04AM +0100, jurgen.defurne@philips.com wrote:
> Hello,
> 
> Are the /etc/group and /etc/passwd files referenced much by cygwin while
> executing programs or doing file accesses ?

Yes, the content of both files is read into memory.  Cygwin needs the
information, especially name, u/gid and SID.

> The only thing I changed yesterday, was copying a new group file, created
> by mkgroup -d. This file is 1669895 bytes large (yes, that is 1.59 Mb), it
> contains 22080 group entries.

*gasp*

> Do you think this should be filed as a bug ?

It doesn't count as a bug but it's a well known problem since... well...
3 years or so.  It's way faster than it was back then but we still don't
have an optimal solution.

Workaround:  Don't use such big files.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin@cygwin.com
Red Hat, Inc.

/etc/group, /etc/passwd usage by cygwin layer ?

[jurgen.defurne]

Hello,

Are the /etc/group and /etc/passwd files referenced much by cygwin while
executing programs or doing file accesses ?

The reason for asking is the following.

I have a server process which  schedules build jobs. This process awakes
every five seconds, to have a good response time. However, when looking
at the Task Manager performance display, I now have every five seconds
a spike up to 30% cpu. This is a dual processor system, at 1.8 GHz and a
SCSI subsystem.

The only thing I changed yesterday, was copying a new group file, created
by mkgroup -d. This file is 1669895 bytes large (yes, that is 1.59 Mb), it
contains 22080 group entries.

I done the test. I took the new group file, removed all lines below what I
needed (about 20500), and replaced it. The result is that everything is
snappier under Cygwin.

Do you think this should be filed as a bug ?

Jurgen

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