Re: Help understanding slow down

Phy Prabab
2004-05-24T01:50:20Z

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Robert,

This is a x86 machine which I have transitioned to for
the time being. I had submitted a previous email
discussing the Opteron, however, did not hear back so
tried the x86 tests.

uname -a
Linux c1m12 2.6.7-rc1 #2 SMP Sun May 23 18:16:47 PDT
2004 i686 i686 i386 GNU/Linux

making headers for my custom binary is basically just
making links to all the different header file
scattered within the source code (some dependancy
make).

Phy

--- "Robert M. Stockmann" <stock@stokkie.net> wrote:
> Hi Phy,
>
> Could you also give the uname -a output of both the
> 2.4.x and
> the 2.6.x kernels ? And also mention which make
> options you use ? :
>
> make : 1 thread , load is around 1.00
> make -j 2 : 2 theads , load is around 2.00
> make -j 4 : 4 theads , load is around 4.00
>
> # uname -a (dual-Xeon SMP machine)
> Linux jackson.stokkie.net 2.4.23abi #1 SMP Sun Jan
> 25 03:28:48 CET 2004 i686 unknown unknown GNU/Linux
> ^^^^
>
> # uname -a (poor PII 400 MHz machine)
> Linux tapebox.stokkie.net 2.6.6 #1 Thu May 13
> 05:48:57 CEST 2004 i686 unknown unknown GNU/Linux
> ^^^ no SMP
>
> Also , is your Opteron machine rather different as
> the mainstream Opteron
> boards, i.e. are there some exotic drivers used ?
>
> Regards,
>
> Robert
>
> > Just for more clarification, here is a perfect
> > example:
> >
> > 2.6.7-p1:
> > 24.86user 51.77system 2:58.87elapsed 42%CPU
> > (0avgtext+0avgdata 0maxresident)k
> > 0inputs+0outputs (13major+7591686minor)pagefaults
> > 0swaps
> >
> > 2.4.21:
> > 28.68user 34.98system 1:12.34elapsed 87%CPU
> > (0avgtext+0avgdata 0maxresident)k
> > 0inputs+0outputs
> (5691267major+1130523minor)pagefaults
> > 0swaps
> >
> >
> > Both runs on the same machine with the same
> process
> > (making headers).
> >
> > Could someone give me some pointers/directions on
> > where to look.
> >
> > Thank you for your time.
> > Phy
> >
> > --- Phy Prabab <phyprabab@xxxxxxxxx> wrote:
> >> Hello,
> >>
> >> I need some help understanding what is at issue
> with
> >> the extreme lsow down in build times for a custom
> >> executable on different kernel versions. The
> >> difference is pretty huge:
> >>
> >> RH 2.4.20-13-7 : ~1m.10s
> >> 2.4.22 : ~1m.40s
> >> 2.4.26 : ~2m.15s
> >> 2.6.1 : ~3m.40s
> >> 2.6.2 : ~4m.00s
> >> 2.6.3 : ~4m.00s
> >> 2.6.6 : ~3m.15s
> >> 2.6.6-mm4 : ~2m.10s
> >> 2.6.6-mm5 : ~2m.50s
> >> 2.6.7-p1 : ~2m.80s
> >> (ran five times on every kernel to get
> approximate
> >> time listed)
> >>
> >> The question is, how can I get the newer kernels
> to
> >> scream like the older kernels?
> >>
> >> I have moved all files in question to the local
> disk
> >> to rule out network issues (though the 2.6.x
> kernels
> >> are faster at net access). I have run the make
> >> command in debug mode and find no differnce betHz
> >> w/8G
> >> RAM.
> >>
> >> Thank you for your assistance.
> >> Phy
> >>
> >> __________________________________
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>
> -
> Robert M. Stockmann - RHCE
> Network Engineer - UNIX/Linux Specialist
> crashrecovery.org stock@stokkie.net
>
> -
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