Mail Archives: cygwin/2007/06/14/12:07:19
> On Thu, Jun 14, 2007 at 04:20:04PM +0100, Aaron Gray wrote:
>>> On Thu, Jun 14, 2007 at 04:15:40AM +0100, Aaron Gray wrote:
>>>> Cygwin seems to only use a small amount of time slice relative to the
>>>> ammount of time slice availiable. Compiles, builds and testsuite are
>>>> relly slow compared to MinGW which takes too much time.
>>>>
>>>> 'time' results confirm this. Process time is about 1/4 of the total
>>>> system time.
>>>>
>>>> It i very noticable on compiling and testing GCC as compared to the
>>>> same on Linux or MinGW.
>>>>
>>>> Is there any way to give Cygwin a bigger slice of the pie ?
>>>>
>>>> Say 50% or 75% ?
>>>
>>> How do you suppose Cygwin is managing this interesting feat of only
>>> using some of the CPU time? What Windows API is Cygwin using to just
>>> grab a small slice of the time?
>>
>> Weird I was getting very long compile times for GCC and on using 'time'
>> was
>> getting indications that make was only getting 25% of total system time.
>>
>> I'll see if it is repeatable on another system.
>>
>>> As a follow-up question: Why do you suppose we are punishing you by
>>> not allowing Cygwin to use all of the CPU by default?
>>>
>>> Oh. Wait. WJM. Nevermind.
>>
>> Weird reply, no need to take the micky !
>
> You have apparently made an assumption that Cygwin is purposely using
> only a part of the CPU. What's weird about asking for your rationale
> for why anyone would write a program which did such a thing, leaving it
> to some undocumented procedure to get better performance? Why do you
> think we wouldn't just make this the default?
>
> In other words: your assumptions don't make a lot of sense.
>
> Here are some better assumptions:
>
> 1) Hey! Maybe, since 'time' is a linux program, whatever is needed to get
> it to work accurately isn't well-implemented in Cygwin, so you can't trust
> its output.
>
> 2) Hey! I just remembered that Cygwin is an emulation layer on top of
> Windows. That means that there is a lot more code being executed than
> would be the case for MinGW! Maybe *that's* why things are slower!
I'll take option 2, thank you :)
Aaron
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/
- Raw text -