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SubjectRe: side-by-side Re: BYTE Unix Benchmarks Version 3.6

I usually run byte bench regularly with every new kernel, so I see some
strange results here.

From your numbers, I would say you are using a PIII 600/900 Mhz (more or
less). It is not an AMD AThlon or a PIV, since float and double are too
slow, not it is a K6 because they are too fast.

On Thu, 5 Sep 2002, bert hubert wrote:

> Date: Thu, 5 Sep 2002 15:48:30 +0200
> From: bert hubert <ahu@ds9a.nl>
> To: Paolo Ciarrocchi <ciarrocchi@linuxmail.org>
> Cc: linux-kernel@vger.kernel.org
> Subject: side-by-side Re: BYTE Unix Benchmarks Version 3.6
>
> Side-by-side with some marked changes highlighted:
>
> 2.4.19 2.5.33
> -----------------------------------------------------------------------
> Dhrystone 2 without register variable 1499020.6 lps 1488327.9 lps
> Dhrystone 2 using register variables 1501168.4 lps 1488265.3 lps
> Arithmetic Test (type = arithoh) 3598100.4 lps 3435944.6 lps

this could vary a little

> Arithmetic Test (type = register) 201521.0 lps 197870.4 lps
> Arithmetic Test (type = short) 190245.9 lps 145140.8 lps

the difference should never be so big

> Arithmetic Test (type = int) 201904.5 lps 104440.5 lps

the difference should never be so big

> Arithmetic Test (type = long) 201906.4 lps 177757.4 lps

the difference should never be so big


seeing this I think you had something running in background using your CPU
while you where running int tests. if you loock at bm/results/log
(log.accum if you did some other run recently)
should find lines like:

Arithmetic Test (type = int)|10.0|lps|227163.1|227158.7|6

that is a little more interesting if you are under load.



> Arithmetic Test (type = float) 210562.7 lps 208476.4 lps
> Arithmetic Test (type = double) 210385.9 lps 208443.3 lps
> System Call Overhead Test 407402.6 lps 397276.7 lps
> >Pipe Throughput Test 476268.6 lps 434561.9 lps


> >Pipe-based Context Switching Test 218969.9 lps 148653.5 lps

this could vary because of a lot of factors, starting from a bad page
colouring going to sendmail activity.

> >Process Creation Test 9078.6 lps 5422.1 lps
> Execl Throughput Test 998.0 lps 771.6 lps

this is interesting, but seeing previous results about int and short,
I am curious about your real load. I am quite curious if with 2.5 you are
using kernel preemption.

> File Read (10 seconds) 1571652.0 KBps 1553289.0 KBps
> File Write (10 seconds) 109237.0 KBps 132002.0 KBps
> >File Copy (10 seconds) 24329.0 KBps 17994.0 KBps
> File Read (30 seconds) 1562505.0 KBps 1540682.0 KBps
> File Write (30 seconds) 113152.0 KBps 137781.0 KBps
> File Copy (30 seconds) 14334.0 KBps 11460.0 KBps

I saw the save with IDE disks... again, are you using kernel preemption?


> C Compiler Test 470.9 lpm 450.9 lpm
> Shell scripts (1 concurrent) 980.4 lpm 876.7 lpm
> Shell scripts (2 concurrent) 544.1 lpm 480.3 lpm
> Shell scripts (4 concurrent) 287.0 lpm 251.0 lpm
> Shell scripts (8 concurrent) 147.0 lpm 126.0 lpm

In my tests generally shell scripts are faster with 2.5 kernel.

> >Dc: sqrt(2) to 99 decimal places 42311.6 lpm 33530.4 lpm

> Recursion Test--Tower of Hanoi 18915.4 lps 18514.3 lps
>
>
> INDEX VALUES 2.4.19 2.5
> TEST INDEX INDEX
>
> Arithmetic Test (type = double) 82.8 82.0
> Dhrystone 2 without register variables 67.0 66.5
> Execl Throughput Test 60.5 46.8
> File Copy (30 seconds) 80.1 64.0
> Pipe-based Context Switching Test 166.1 112.7
> Shell scripts (8 concurrent) 36.8 31.5
> ========= =========
> SUM of 6 items 493.2 403.6
> AVERAGE 82.2 67.3
>

Luigi

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