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Re: ps shows same process more than once
- From: "George M. Florendo" <georgeflorendo at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 2 Dec 2013 13:47:09 +0800
- Subject: Re: ps shows same process more than once
- Authentication-results: sourceware.org; auth=none
- References: <CAGaO6c9rxafNajvdzQhngOjTQn+fjjAp9NRLTpYbbgcKHe8R5A at mail dot gmail dot com> <20131128130813 dot GH2449 at calimero dot vinschen dot de> <20131128155504 dot GC5063 at ednor dot casa dot cgf dot cx> <20131128160243 dot GB5803 at ednor dot casa dot cgf dot cx>
On 11/29/13, Christopher Faylor wrote:
> On Thu, Nov 28, 2013 at 10:55:04AM -0500, Christopher Faylor wrote:
>>On Thu, Nov 28, 2013 at 02:08:13PM +0100, Corinna Vinschen wrote:
>>>On Nov 28 15:20, George M. Florendo wrote:
>>>> Hi,
>>>>
>>>> I run a non cygwin apache process named httpd.exe. Checking it with
>>>> "ps -W" shows a listing of the same process (with PID 4560 in this
>>>> case) twice.
>>>>
>>>> $ ps -W | grep httpd
>>>> 4560 1604 4560 5304 pty0 1000 09:55:21
>>>> /home/georgeflorendo/wamp/bin/apache/Apache2.4.4/bin/httpd
>>>> 4560 1604 4560 5304 pty0 1000 09:55:21
>>>> /home/georgeflorendo/wamp/bin/apache/Apache2.4.4/bin/httpd
>>>> 7508 0 0 7508 ? 0 15:09:50
>>>> C:\cygwin\home\georgeflorendo\wamp\bin\apache\Apache2.4.4\bin\httpd.exe
>>>>
>>>> Doing a "ps aux" shows it only once.
>>>>
>>>> $ ps aux
>>>> PID PPID PGID WINPID TTY UID STIME COMMAND
>>>> 1340 7856 1340 5720 pty5 1000 15:13:50 /usr/bin/ps
>>>> 1604 4008 1604 2292 pty0 1000 09:17:01
>>>> /usr/bin/bash
>>>> 4008 1 4008 4008 ? 1000 09:17:00
>>>> /usr/bin/mintty
>>>> 4560 1604 4560 5304 pty0 1000 09:55:21
>>>> /home/georgeflorendo/wamp/bin/apache/Apache2.4.4/bin/httpd
>>>>
>>>> <snipped>
>>>>
>>>> Is it correct that ps -W shows the same process twice?
>>>
>>>Not exactly but it could happen. Can you try the latest snapshot Cygwin
>>>DLL from http://cygwin.com/snapshots/ and see if it fixes the problem?
>>
>>I don't see anything in the ChangeLog which would affect this and I'd
>>be concerned if there was.
>>
>>There are scenarios where two different windows pids can be associated
>>with the same Cygwin pid. You should only see it when you do a "ps -W".
>>
>>So, AFAICT, the correct answer to the "Is it correct" is "Yes'.
>
> Oops. Sorry. Just noticed that the pids weren't "different". There
> are still pathological situations where a pid can show up twice when
> doing a "ps -W". I've seen the issue before but fixing it would involve
> a global process lock which would slow down Cygwin for the benefit of
> a more accurate "ps -W".
Oh, I'm sorry too. Didn't get to read your first sentence earlier.
I'd rather have a faster cygwin more than a more accurate "ps -W".
Thanks for all your help.
--
George M. Florendo
Programmer
http://www.facebook.com/i.am.georgeflorendo
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