Re: [Ngspice-devel] tclspice for windows

[Paolo N. <pne...@gm...>]

Hi, Holger and Stephan,

Ngspice uses sparse as library for solving the linear system that is
generated from the circuit graph. Sparse used a linked lists approach to
represent the matrix in memory, not vectors, so I think that
vectorization does not help to improve performances. This could be an
explanation.

Ciao,
Paolo



th...@mi... wrote:
> Holger,
> 
> perhaps this is new to gcc4 or you need a additional compiler switch
> but I have read that the compiler make automatically a vectorisation
> where possible to gain speed.
> 
> (-fast) -ftree-vectorize
> 
> On
> http://www.mingw.org/MinGWiki/index.php/GccStatus
> you will find links to mingw-gcc4-versions.
> 
> Regards,
> Stephan
> 
> 
>> Stephan,
>>
>> optmising is set to -O2 in configure.in.
>>
>>   203 if test "$enable_debug" = "no"; then
>>   204 	if test "x$GCC" = "xyes"; then
>>   205 		AC_MSG_WARN(Removing debugging option!)
>>   206 		CFLAGS="$CFLAGS -O2 -Wall"
>>   207 	else
>>   208 		AC_MSG_WARN(Removing debugging option!)
>>   209 		CFLAGS="$CFLAGS"
>>   210 	fi
>>
>> If I use "-mtune=pentium4 -O3 -msse3" instead of "-O2" (Mingw gcc 3.4.5) I
>> do not see much speed difference.
>>
>> Regards
>>
>> Holger
>>
>>
>>
>>
>>
>>
>>
>> th...@mi... schrieb:
>>> Hello all,
>>>
>>> to gain speed you should probably try too add additional gcc-
>>> options (when --disable-debug is also applied) like -mtune=pentium4
>>>  -O6 (-O3) -msse3 ... but in the "configure.in" there is as far as I
>>> have
>>> seen it no optimization enabled ...
>>>
>>>
>>>
>>> Regards,
>>> Stephan
>>>
>>>
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> 
> 
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