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Re: Cygwin slow on x64 systems
- From: Vincent Richomme <forumer at smartmobili dot com>
- To: David Morgan <dmorgan at aechelon dot com>
- Cc: <cygwin at cygwin dot com>
- Date: Sun, 24 Jan 2010 00:03:24 +0100
- Subject: Re: Cygwin slow on x64 systems
- References: <20100123171936.GE23796@err>
On Sat, 23 Jan 2010 11:19:36 -0600, David Morgan <dmorgan@aechelon.com>
wrote:
> Hello all,
>
> We use cygwin for our build environment, and have observed that
> everything runs extremely slow on x64 systems, for versions newer than
> approximately 1.5.12 (including 1.7.1). When I run the following
command
> in BASH,
>
> while true; do date >> file; done
>
> on a 1.5.12 Core II system, I get approximately 100 dates per second.
> On a 1.7.1 Nehalem system, I get approximately 15, and it takes several
> seconds for Ctrl-C to take effect, whereas it's instantaneous on 1.5.12.
> It makes no difference whether I redirect the output or not.
>
> We have found that the problem was introduced somewhere between 1.5.12
> and 1.5.24-2. We have not seen any such slowdown on x86 systems.
> We have observed this on XP x64, Server 2003 R2 x64, and now (with 1.7.1
> only) on Windows 7 x64.
>
> Can anyone recommend how we could profile this to help isolate the
problem?
> We have vTune and Quantify in-house.
Hope you will find something because I already have reported this but with
no success.
My QuadCore 3.GHz with 4GB feels like an old 386 when running cygwin on
Windows 7 64 bits!
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