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From: tednolan AT bellsouth DOT net
To: cygwin AT cygwin DOT com
Subject: Re: How big are your /etc/passwd and /etc/group files?
In-reply-to: <52EC4727.2000308@gmail.com>
References: <20140131203738 DOT GA8707 AT calimero DOT vinschen DOT de> <CAKf2h5R-FuQX9W=ojw4+ez8gqOHjwYshMh3FmmfNu3r12sRFeQ AT mail DOT gmail DOT com> <20140131220314 DOT GH2821 AT calimero DOT vinschen DOT de> <52EC4727 DOT 2000308 AT gmail DOT com>
Comments: In-reply-to Max Polk <maxpolk AT gmail DOT com>   message dated "Fri, 31 Jan 2014 20:00:23 -0500."
Date: Fri, 31 Jan 2014 23:13:49 -0500
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In message <52EC4727 DOT 2000308 AT gmail DOT com>you write:
>On 1/31/2014 5:03 PM, Corinna Vinschen wrote:
>> On Jan 31 22:40, Frank Fesevur wrote:
>>> 2014-01-31 Corinna Vinschen:
>>>>    Is anybody here who's using /etc/passwd and/or group files
>>>>    of more than 16K in size?
>>> The new way to store the stuff would make Cygwin definitely faster, 
>>> but it would struggle with... uhm... 2.6 Megs file on the 32 bit 
>>> version of Cygwin, Hmm. I'm wondering how to solve that elegantly. 
>>> Corinna 
>
>Every process needs to load only the current user's entry up front. 
>Somewhere down the road it only *might* have to do things like translate 
>from uid/gid into a string for directory listings, in some cases only a 
>handful of these translations.  It's essentially a (old dbm style unix) 
>database lookup.
>
>So defer the database lookups to a libgdbm that goes against a (old dbm 
>style unix) database, and don't keep that in memory, unless you want a 
>small LRU algorithm in there to keep a small fixed number.  I bet the 
>tiny delay later on a ls or other unix translation won't be very noticeable.
>

Maybe an /etc/nsswitch.conf to choose the desired behavior?

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