Very slow Cygwin startup on Windows 7

Andrey Repin
Wed Feb 18 14:25:00 GMT 2015

Greetings, Dennis Hagarty (dehagart)!

>>>>Could you please do me a favor and repeat the test with a little deviation of
>>>>my previous suggestion?

>>>>1. Remove /etc/{nsswitch.conf,passwd,group} files. (Rename, move away - by
>>>>your choice.)
>>>>2. Stop cygserver, if it is running, and any other Cygwin-related programs.
>>>>3. Start the mintty (elevated, if need) with write access to /etc. Supposedly,
>>>>this will be slow.
>>>>4. Make sure id -G lists all the groups you're member of.
>>>>The `id -znG | tr "\0" "\n"` would probably be more visible.
>>>>5. Repeat the steps from previous suggestion.
>>>>    getent passwd $(id -u) > /etc/passwd
>>>>    getent group $(id -G) > /etc/group
>>>>    printf "%s\n" "passwd: files db" "group: files db" > /etc/nsswitch.conf
>>>> 6. Close and restart mintty

>>> After I'd run the id -znG, it found 87 groups.
>>> Then I did this (even with cygserver running)

>>> ~ getent passwd $(id -u) > /etc/passwd
>>> ~ getent group $(id -G) > /etc/group
>>>       0 [main] getent 48156 transport_layer_pipes::connect: lost connection to cygserver, error = 2

>>That prompts to repeat the previous question from Corinna: are you by chance
>>remote from your DC? (VPN connection?)

> Yes - although it's pretty quick link (and not the other side of the world).
> Seems to be a node called  \\ADC-AER1-C1-2 

> Pinging [] with 32 bytes of data:
> Reply from bytes=32 time=36ms TTL=124
> Reply from bytes=32 time=44ms TTL=124
> Reply from bytes=32 time=37ms TTL=124
> Reply from bytes=32 time=56ms TTL=124

>>> ~ wc -l /etc/group
>>> 58 /etc/group
>>> Since it seems like cygserver stopped, it took a while to complete.
>>> Anyway, with cygserver stopped, I ran the getent again elevated and got 83.
>>> ~ wc -l /etc/group
>>> 83 /etc/group
>>83 vs. 87, still not the right number.
>>> Not really sure how many groups I'm a member of (in another tool), but seems about right.

>>Anyway, how was the results after these manipulations?

> Performance now is good - as long as the cygserver is running.
> With:
>>cmd /v:on /c "echo !TIME! & C:\cygwin64\bin\mintty.exe /bin/echo "test" & echo !TIME!"
> 12:13:43.53
> 12:13:43.65 = 0:00.12

> Without:
> C:\Users\dehagart>cmd /v:on /c "echo !TIME! & C:\cygwin64\bin\mintty.exe /bin/echo "test" & echo !TIME!"
> 12:14:36.28
> 12:16:24.85 = 1:48.57

Thank you. Not the results I was hoping for, but thank you anyway.
Please continue investigation with Corinna.
And be sure your help is much appreciated :)

Andrey Repin ( 18.02.2015, <16:40>

Sorry for my terrible english...

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