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Date: Fri, 31 Jan 2014 20:00:23 -0500
From: Max Polk <maxpolk AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: How big are your /etc/passwd and /etc/group files?
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>
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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.

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