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UNIX bench better on 2.2 than 2.4?

DISCUSSION Jean-Eric Cuendet 2 participants 4 messages Mar 15, 2002

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Jean-Eric Cuendet

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#0 lore raw

Sorry, I forgot to give kernel versions...

Hi,
I ran UNIX bench on 4 of our machines. The results are below. What is strange is that 2.2 makes better than 2.4! Is it a known fact? And is the UNIX bench better with 2 CPU?
-jec

Results:
Host1: 2xPIII 550MHz / 1Gb RAM / RAID5 SCSI / 2.4.6smp + LVM

      Result: 164.7
Host2: 2xPIII 866MHz / 1Gb RAM / RAID1 soft IDE / 2.4.16smp + LVM
      Result: 195.7
Host3: 1xPIII 800MHz / 512Mb RAM / IDE / 2.2.19 RedHat 6.2
      Result: 208.6
Host4: 1xPIII 600MHz / 256Mb RAM / IDE / 2.4.19-pre2-ac4-preempt
      Result: 153.6

Host1:
Dhrystone 2 using register variables 116700.0 1139475.0 97.6

Double-Precision Whetstone                      55.0      295.2       53.7
Execl Throughput                                43.0      697.7      162.3
File Copy 1024 bufsize 2000 maxblocks         3960.0    83438.0      210.7
File Copy 256 bufsize 500 maxblocks           1655.0    38613.0      233.3
File Copy 4096 bufsize 8000 maxblocks         5800.0   121259.0      209.1
Pipe Throughput                              12440.0   254518.7      204.6
Process Creation                               126.0     1831.7      145.4
Shell Scripts (8 concurrent)                     6.0      201.7      336.2
System Call Overhead                         15000.0   251716.1      167.8

=========
FINAL SCORE 164.7

Host2:
Dhrystone 2 using register variables 116700.0 1837005.3 157.4

Double-Precision Whetstone                      55.0      478.4       87.0
Execl Throughput                                43.0      923.8      214.8
File Copy 1024 bufsize 2000 maxblocks         3960.0    54663.0      138.0
File Copy 256 bufsize 500 maxblocks           1655.0    18601.0      112.4
File Copy 4096 bufsize 8000 maxblocks         5800.0    96807.0      166.9
Pipe Throughput                              12440.0   399294.5      321.0
Process Creation                               126.0     3503.8      278.1
Shell Scripts (8 concurrent)                     6.0      277.0      461.7
System Call Overhead                         15000.0   393738.7      262.5

=========
FINAL SCORE 195.7

Host3:
Dhrystone 2 using register variables 116700.0 1506306.9 129.1
Double-Precision Whetstone 55.0 364.4 66.3

Execl Throughput                                43.0     1103.3      256.6
File Copy 1024 bufsize 2000 maxblocks         3960.0   110403.0      278.8
File Copy 256 bufsize 500 maxblocks           1655.0    53065.0      320.6
File Copy 4096 bufsize 8000 maxblocks         5800.0   151107.0      260.5
Pipe Throughput                              12440.0   378679.6      304.4
Pipe-based Context Switching                  4000.0   161272.9      403.2
Process Creation                               126.0     7144.7      567.0

Shell Scripts (8 concurrent) 6.0 20.0 33.3
System Call Overhead 15000.0 412399.5 274.9
=========
FINAL SCORE 208.6

Host4:
Dhrystone 2 using register variables 116700.0 1099714.7 94.2

Double-Precision Whetstone                      55.0      328.1       59.7
Execl Throughput                                43.0      692.1      161.0
File Copy 1024 bufsize 2000 maxblocks         3960.0    56029.0      141.5
File Copy 256 bufsize 500 maxblocks           1655.0    18783.0      113.5
File Copy 4096 bufsize 8000 maxblocks         5800.0    96243.0      165.9
Pipe Throughput                              12440.0   306228.7      246.2
Process Creation                               126.0     3937.3      312.5
Shell Scripts (8 concurrent)                     6.0      125.9      209.8
System Call Overhead                         15000.0   282470.2      188.3

=========
FINAL SCORE 153.6

Signature · 7 lines
Jean-Eric Cuendet
Linkvest SA
Av des Baumettes 19, 1020 Renens Switzerland
Tel +41 21 632 9043  Fax +41 21 632 9090
E-mail: [email protected]
http://www.linkvest.com
--------------------------------------------------------
#1 lore raw
Quoted 9 lines · Jean-Eric Cuendet

Results:
Host1: 2xPIII 550MHz / 1Gb RAM / RAID5 SCSI / 2.4.6smp + LVM

       Result: 164.7
Host2: 2xPIII 866MHz / 1Gb RAM / RAID1 soft IDE / 2.4.16smp + LVM
       Result: 195.7
Host3: 1xPIII 800MHz / 512Mb RAM / IDE / 2.2.19 RedHat 6.2
       Result: 208.6
Host4: 1xPIII 600MHz / 256Mb RAM / IDE / 2.4.19-pre2-ac4-preempt
       Result: 153.6

I dunno what Unix bench is... but isn't 153.6/208.6 close to 600/800 in terms of a fraction?

It isn't really fair to compare different machine configurations with different OS's, and declare that the OS is the only factor involved.

Make Host3 or Host4 have both versions of the linux kernel in /boot and try each on the same machine.

mark

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author
#2 lore raw
In reply to Jean-Eric Cuendet
Quoted 13 lines
Quoted 4 lines

Results:
Host1: 2xPIII 550MHz / 1Gb RAM / RAID5 SCSI / 2.4.6smp + LVM

Quoted 8 lines
      Result: 164.7
Host2: 2xPIII 866MHz / 1Gb RAM / RAID1 soft IDE / 2.4.16smp + LVM
      Result: 195.7
Host3: 1xPIII 800MHz / 512Mb RAM / IDE / 2.2.19 RedHat 6.2
      Result: 208.6
Host4: 1xPIII 600MHz / 256Mb RAM / IDE / 2.4.19-pre2-ac4-preempt
      Result: 153.6
Quoted 3 lines

I dunno what Unix bench is... but isn't 153.6/208.6 close to 600/800 in terms of a fraction?

Yes, you are right for this one.
But what impressed me is between Host2/Host3. One is a dual-866 with 2.4.16 and the other is mono-800 with 2.2.19. And the host3 with 2.2.19 is ~7% better than Host2 (Not counting that Host3 has ~8% more CPU clock, which should have be ~15% better for Host2 vs Host3...)

Quoted 3 lines

Make Host3 or Host4 have both versions of the linux kernel in /boot and try each on the same machine.

But that's just what I'd like to see. How 2.4 compares vs 2.2 -jec

#3 lore raw
In reply to Jean-Eric Cuendet
Quoted 5 lines · Jean-Eric Cuendet

Yes, you are right for this one.
But what impressed me is between Host2/Host3. One is a dual-866 with 2.4.16 and the other is mono-800 with 2.2.19. And the host3 with 2.2.19 is ~7% better than Host2 (Not counting that Host3 has ~8% more CPU clock, which should have be ~15% better for Host2 vs Host3...)

There is no guarantee that UNIX bench is SMP-friendly, or even designed to test an SMP machine. Single programs that make good use of an SMP machine usually have to be designed very differently than a traditional program designed for a single processor.

It is probably just luck that the numbers jump around.

Just because Unix bench performs better or worse, or not as better, on an SMP machine, as a non-SMP machine, does not mean that the numbers accurately effect the capabilities of a real-life application. Unless specifically designed for the environment, it is even possible that the numbers would not even come close.

mark

Signature · 9 lines
[email protected]/[email protected]/[email protected] __________________________
.  .  _  ._  . .   .__    .  . ._. .__ .   . . .__  | Neighbourhood Coder
|\/| |_| |_| |/    |_     |\/|  |  |_  |   |/  |_   | 
|  | | | | \ | \   |__ .  |  | .|. |__ |__ | \ |__  | Ottawa, Ontario, Canada

  One ring to rule them all, one ring to find them, one ring to bring them all
                       and in the darkness bind them...

                           http://mark.mielke.cc/