TEST RELEASE: Cygwin 1.7.35-0.3

Corinna Vinschen corinna-cygwin@cygwin.com
Mon Feb 23 12:23:00 GMT 2015

On Feb 20 13:46, John Hein wrote:
> Corinna Vinschen wrote at 11:29 +0100 on Feb 20, 2015:
>  > So I just changed the order of the objectClass and objectCategory test.
>  > If that's really the culprit, you can easily test it:
>  >
>  > Revert to the Cygwin 1.7.34-6   DLL, run `time mkpasswd -d >/dev/null'
>  > Revert to the Cygwin 1.7.35-0.3 DLL, run `time mkpasswd -d >/dev/null'
>  > Revert to the Cygwin 1.7.34-6   DLL, run `time mkpasswd -d >/dev/null'
>  > Revert to the Cygwin 1.7.35-0.3 DLL, run `time mkpasswd -d >/dev/null'
>  >
>  > Does that clearly show that 1.7.34-6 is faster performing the enumeration?
>  > If so, and despite my total puzzlement, the order in the expression seem
>  > to have an effect.
> mkpasswd w/1.7.35-0.3 finally finished - took about 5+ hours and only
> returned ~1800 results instead of ~8000.
> mkpasswd w/1.7.33 took about 50 minutes.  This was mostly after peak
> business hours, however (not clear how much that matters).
> Trying 1.7.34-6 now.  Looks like it's going to be slow.  It's been
> two hours and only about 200 entries have trickled in.
> Slow going here.  Note this last run is under strace (see below), so
> not exactly what you suggested.  I'll try without strace and redirecting
> to /dev/null to see if it matters after this test finishes (if ever).

Come to think of it, it's probably really just slow.  The difference
between mkpasswd/mkgroup for domain accounts:


  Calls NetUserEnum/NetGroupEnum,NetLocalGroupEnum with maximum Buffer


  Calls an LDAP enumerator fetching 100 SIDs per call.
  For each SID:
    Call LookupAccountSid.
    For each User:
      Depending on nsswitch.conf, call LDAP to fetch the extended passwd
      info (pw_shell, pw_home, pw_gecos).

I guess there's some room for improvement.

OTOH, keep in mind that you're not suppsoed to call mkpasswd/mkgroup
to enumerate your entire organization.  If you're using it at all, then
only to create the required entries in /etc/passwd and /etc/group for
your local acocunt to work, and then leave everything else to the "db"


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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