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Date:	Thu, 3 Mar 2005 12:31:01 -0500
From:	Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Slow pipes after upgrade cygwin 1.5.12-1->1.5.13-1 when running boinc
Message-ID:	<20050303173101.GC3414@trixie.casa.cgf.cx>
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On Thu, Mar 03, 2005 at 06:26:44PM +0100, Bengt-Arne Fjellner wrote:
>Christopher Faylor skrev:
>> On Thu, Mar 03, 2005 at 05:36:00PM +0100, Bengt-Arne Fjellner wrote:
>>>With boinc running einstein AT home at lowest priority ( uses 100% cpu but yields
>>> easily)
>>>simple pipes takes a long time.
>>>Example: from a bash prompt
>>>echo hello|grep -v xyz
>>>with boinc running and 1.5.13-1 takes about 7 seconds.  if i stop boinc
>>>it takes parts of a second.  after downgrade to 1.5.12-1 with boinc
>>>running: parts of a second.
>>>
>>>i have seen this on two different computers one HT one normal.
>>>
>>>Single commands are still fast.
>>
>> Is there some reason why you'd expect us to know what "boinc" is?
>
>My stupidity i think...
>Really its a community infrastructure for networked computing
>"Berkeley Open Infrastructure for Network Computing"
>http://boinc.berkeley.edu/
>
>With currently this subproject running:
>Einstein AT Home
>http://einstein.phys.uwm.edu/
>Dont know if any other subprojects are affected.

If I had to guess, I'd say that boinc is putting itself into a high priority
class for some reason and is eating cpu cycles, causing cygwin's pipe reading
code to stall.

I've made a change to cygwin to put it's pipe reading code into a slightly
higher priority class.  This change is in the latest snapshot:

http://cygwin.com/snapshots/

cgf

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