Starting a new terminal window is slow. What's going on?

X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:content-type:message-id:mime-version :subject:date:references:to:in-reply-to; q=dns; s=default; b=lNE eulTHdB7VhrhHX/WqvNaZviKHKc1p1UdNGWDPW6bzzp4zZ/aEMXSxXqNRNzl8hyC LxIv4aSrRBB4xYUaA10ZTU65S2HYUmvnbL4L/n7tx+Z/qIBKXDvhje57n2oH+HXY bODskeNdE9PhjwHgFAiJgy7SvGxzOiw8hBNNbX2E= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:content-type:message-id:mime-version :subject:date:references:to:in-reply-to; s=default; bh=uGHYrA274 A7OmGLmhzK6w7vVnPQ=; b=YV/eakNl6CN0uXocThVShod8AuI9wO5VgLbdqRJNv IaylBoL+v/npG2Mo4LaqBKyYmEqSgLlC6MCjeNqJr9JyHtHgHxqcyUulEZoqOJLq id9geIH1cJzzTDIYZFja2YqQou47/ng5vasZzSuZvYxzt4EtCYpYKnJADJ0VwbBh 5Y= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.2 required=5.0 tests=AWL,BAYES_00,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 X-HELO: etr-usa.com From: Warren Young Content-Type: multipart/mixed; boundary="Apple-Mail=_C4117A6F-7406-4B92-AE59-AAE95D012D2F" Message-Id: <3E1E37ED-32CC-49A8-AECC-2FEE8FC1648C@etr-usa.com> Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2070.6\)) Subject: Re: slow startup after upgrade Date: Tue, 10 Feb 2015 15:52:35 -0700 References:

<20150210093816 DOT GG15989 AT calimero DOT vinschen DOT de> To: cygwin AT cygwin DOT com In-Reply-To: <20150210093816.GG15989@calimero.vinschen.de> X-IsSubscribed: yes --Apple-Mail=_C4117A6F-7406-4B92-AE59-AAE95D012D2F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On Feb 10, 2015, at 2:38 AM, Corinna Vinschen = wrote: >=20 > "Starting a Cygwin shell is slow, what's going on?" >=20 > I'd not be overly grudgy if somebody wants to come up with a FAQ text=E2= =80=A6 I=E2=80=99m not entirely sure I understand the problem, but I=E2=80=99ve at= tached a starting point. I=E2=80=99m pretty sure the issue brought up in this thread isn=E2=80=99t t= he only possible cause of slow launches. DNS can do it, too, and I suspect= if I wracked my brain some more on it, I could come up with other causes. The DocBook isn=E2=80=99t validated. It may need to be adjusted before it = will let the FAQ document build correctly. It might also be good to includ= e olinks or ulinks to other parts of the Cygwin docs. --Apple-Mail=_C4117A6F-7406-4B92-AE59-AAE95D012D2F Content-Disposition: attachment; filename=slowtty.dbx Content-Type: application/octet-stream; name="slowtty.dbx" Content-Transfer-Encoding: 7bit Starting a new terminal window is slow. What's going on? There are many possible causes for this. This answer is more a list of things to look into than a set of solutions. If your terminal windows suddenly began starting slowly after a Cygwin upgrade, the most likely cause is that you have an outdated authentication setup. For almost all its lifetime, Cygwin has used Unix-like /etc/passwd and /etc/group files to mirror the contents of the Windows SAM and AD databases. Although these files can still be used, since Cygwin 1.7.34, new installations now use the SAM/AD databases directly. To switch to the new method, move these two files out of the way and restart the Cygwin terminal. That runs Cygwin in its new default mode. If you are on a system that isn't using AD domain logins, this makes Cygwin use the native Windows SAM database directly, which may be faster than the old method involving /etc/passwd and such. At worst, it will only be a bit slower. (Which situation applies depends on the benchmark you run.) If you are on an AD system, a hybrid approach you might consider is to re-run mkpasswd and mkgroup, then put the following into /etc/nsswitch.conf to make Cygwin treat these files as read-only local caches of your AD database: passwd: files group: files By leaving out the "db" option, we are telling the Cygwin DLL not to even try to do AD lookups. If your AD servers are slow, this local cache will speed things up. The downside is the old stale cache problem: any time the AD databases change, your local cache will go out of date until you update the files manually. Another common cause of slow Cygwin Terminal starts is a bad DNS setup. Many things that occur during a Cygwin Terminal startup require fast DNS lookups. More...? If none of the above helps, the best troubleshooting method is to run your startup scripts in debug mode. Right-click your Cygwin Terminal icon, go to Properties, and edit the command. It should be something like C:\cygwin\bin\mintty.exe -i /Cygwin-Terminal.ico -. Assuming you are using Bash for your login shell, change it to C:\cygwin64\bin\mintty /bin/bash -lx That will cause it to write out a line for every command it runs. A slow Cygwin Terminal launch usually means one or more of the many commands Cygwin runs when starting up will take a long time. That will be your clue as to what's going on. --Apple-Mail=_C4117A6F-7406-4B92-AE59-AAE95D012D2F Content-Type: text/plain; charset=us-ascii -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple --Apple-Mail=_C4117A6F-7406-4B92-AE59-AAE95D012D2F--