RE: [ns] Difference between 8Gb and 8000Mb?

[aemdad1 <aemdad1@triton.towson.edu>]

thanks ,i will follow up your instruction for more investigation.

A Emdadi

>===== Original Message From Haobo Yu <haoboy@ISI.EDU> =====
>Read tcl/lib/ns-link.tcl:176. This set bandwidth, then delay.cc:54, this
>is bind_bw(), then Tcl.cc:995 that is how bind_bw() linked to
>InstVarBandwidth, then Tcl.cc:794, that's where bw_atof() is called, then
>Tcl.cc:929, that's where bw_atof() is defined. Go down then u find no Gb
>is handled.
>
>If you don't understand how bind_bw() works, pls check out the first
>couple of chapters in ns manual.
>
>If you do a grep on bw_parse in tcl/*/*.tcl, you'll find it's used only
>for OTCL variables but not the bound ones.
>
>On Sat, 8 Jul 2000, aemdad1 wrote:
>
>> Date: Sat, 8 Jul 2000 16:35:41 -0400
>> From: aemdad1 <aemdad1@triton.towson.edu>
>> To: Haobo Yu <haoboy@ISI.EDU>
>> Cc: ns-users <ns-users@ISI.EDU>
>> Subject: RE: [ns] Difference between 8Gb and 8000Mb?
>>
>> but bw_parse is the only procedure which will define bw ,so without 
bw_parse
>> ,bw has no meaning in the simulator ,so i think Bo Wen is right.
>>
>> A Emdadi
>>
>>
>> >===== Original Message From Haobo Yu <haoboy@ISI.EDU> =====
>> >No it does not. bw_parse is never used in setting bandwidth of a _link_.
>> >trace down to new SimplexLink for instance, you'll find it went down to
>> >tclcl and uses bw_atof() in Tcl.cc which does not handle Gb. So use 8000Mb
>> >for now.
>> >
>> >On Sat, 8 Jul 2000, Bo Wen wrote:
>> >
>> >> Date: Sat, 08 Jul 2000 00:46:58 -0700
>> >> From: Bo Wen <bowen@mail.wsu.edu>
>> >> To: Haobo Yu <haoboy@ISI.EDU>
>> >> Cc: Kaleelazhicathu R R Kumar <iscp9133@nus.edu.sg>, ns-users@ISI.EDU
>> >> Subject: Re: [ns] Difference between 8Gb and 8000Mb?
>> >>
>> >> No..., just check out ns tcl code, Simulator::bw_parse{}can
>> >> do with Gb now.
>> >>
>> >> Haobo Yu wrote:
>> >>
>> >> > ns does not parse Gb (which was not that popular 3 years ago) You
>> >> > have to use 8000Mb for now.
>> >> >
>> >> > On Fri, 7 Jul 2000, Bo Wen wrote:
>> >> >
>> >> > > Date: Fri, 07 Jul 2000 21:10:53 -0700
>> >> > > From: Bo Wen <bowen@mail.wsu.edu>
>> >> > > To: Kaleelazhicathu R R Kumar <iscp9133@nus.edu.sg>
>> >> > > Cc: ns-users@ISI.EDU
>> >> > > Subject: Re: [ns] Difference between 8Gb and 8000Mb?
>> >> > >
>> >> > > No..., what I mean is bandwidth, not storage size.  For
>> >> > > bandwidth, they shouble be same.  My question might not
>> >> > > be clear:
>> >> > >
>> >> > > In my simulation, I defined all links with 8Gb, run ns;
>> >> > > defined all links with 8000Mb, run ns again.  I just found
>> >> > > the latter is much faster (I guess abround 100 times) than
>> >> > > the former.
>> >> > >
>> >> > > Why, is that possible the variable (bind_bw) binding problem?
>> >> > >
>> >> > > Thanks,
>> >> > >
>> >> > > Bo
>> >> > >
>> >> > > Kaleelazhicathu R R Kumar wrote:
>> >> > >
>> >> > > > it should be the other way i guess ...
>> >> > > > 8GB should be 8*1024*1024*1024=8589934592b
>> >> > > > 8000Mb=8000*1024*1024=8388608000b
>> >> > > > where 1024=1k
>> >> > > > by normal convention
>> >> > > > so 8Gb > 8000Mb
>> >> > > >   Renjish...
>> >> > > >
>> >> > > > -----Original Message-----
>> >> > > > From: Bo Wen [mailto:bowen@mail.wsu.edu]
>> >> > > > Sent: Saturday, July 08, 2000 8:18 AM
>> >> > > > To: ns-users@ISI.EDU
>> >> > > > Subject: [ns] Difference between 8Gb and 8000Mb?
>> >> > > >
>> >> > > > I've got a werid phenomen, that when I define link with 8Gb,
>> >> > > > it runs 100(approximately) times slower than defining link
>> >> > > > with 8000Mb.
>> >> > > >
>> >> > > > Seems I'll try 8000000b, see whether it runs faster?
>> >> > > >
>> >> > > > Thanks.
>> >> > > >
>> >> > > > Bo Wen
>> >> > >
>> >> > >
>> >>
>> >>
>>
>>