Re: 2.4.8-pre1 and dbench -20% throughput

Steven Cole
2001-07-29T17:48:30Z

On Saturday 28 July 2001 14:13, Daniel Phillips wrote:
[snippage]
> Oh, by the way, my suspicions about the flakiness of dbench as a
> benchmark were confirmed: under X, having been running various memory
> hungry applications for a while, dbench on vanilla 2.4.7 turned in a 7%
> better performance (with a distinctly different process termination
> pattern) than in text mode after a clean reboot.
>

>From the FWIW department, apologies in advance if this is all moot.

Here are the results of nine runs of dbench 32. I ran vmstat before and after
each instance of running time ./dbench 32. These verbose results are provided
after the following summary. The test machine is a PIII 450, 384MB, ReiserFS on
all partitions, disks IDE. Tests were all run from an xterm and KDE2.

Steven

2.4.8-pre2 After running 8 hours
Run #1 Throughput 5.77702 MB/sec
Run #2 Throughput 5.8781 MB/sec
Run #3 Throughput 6.08052 MB/sec

2.4.8-pre2 After fresh reboot
Run #4 Throughput 7.18107 MB/sec
Run #5 Throughput 7.0096 MB/sec
Run #6 Throughput 7.1165 MB/sec

2.4.7 After fresh reboot
Run #7 Throughput 8.96163 MB/sec
Run #8 Throughput 9.20907 MB/sec
Run #9 Throughput 9.88017 MB/sec

-------------------------------------------------------------------------------
2.4.8-pre2 After running 8 hours
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 26272 31248 12100 63688 2 1 49 185 580 158 2 7 91

[....snipped]
Throughput 5.77702 MB/sec (NB=7.22127 MB/sec 57.7702 MBit/sec)
34.70user 426.52system 12:11.28elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 26120 130808 5656 11236 2 1 53 249 716 156 2 9 89

[....snipped]
Throughput 5.8781 MB/sec (NB=7.34763 MB/sec 58.781 MBit/sec)
34.55user 439.76system 11:59.61elapsed 65%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 26120 130200 5152 11884 2 1 56 310 844 154 2 11 87

[....snipped]
Throughput 6.08052 MB/sec (NB=7.60065 MB/sec 60.8052 MBit/sec)
34.36user 409.73system 11:35.69elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 26120 144324 4888 12024 2 1 59 366 962 153 2 13 86

-------------------------------------------------------------------------------
2.4.8-pre2 After fresh reboot
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 278468 9152 56208 0 0 296 118 950 248 13 15 73

[....snipped]
Throughput 7.18107 MB/sec (NB=8.97633 MB/sec 71.8107 MBit/sec)
34.35user 348.11system 9:48.24elapsed 65%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 287192 13064 34696 0 0 167 2090 4619 125 8 69 23

[....snipped]
Throughput 7.0096 MB/sec (NB=8.762 MB/sec 70.096 MBit/sec)
33.05user 348.67system 10:03.62elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 285804 14440 34700 0 0 145 2368 5128 107 7 76 17

[....snipped]
Throughput 7.1165 MB/sec (NB=8.89563 MB/sec 71.165 MBit/sec)
34.67user 352.81system 9:54.57elapsed 65%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 285192 15152 34700 0 0 136 2475 5324 101 7 79 14

-------------------------------------------------------------------------------
2.4.7 After fresh reboot
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 0 278356 9288 56176 0 0 293 117 941 238 13 15 73

[....snipped]
Throughput 8.96163 MB/sec (NB=11.202 MB/sec 89.6163 MBit/sec)
33.91user 244.57system 7:52.40elapsed 58%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 309540 5808 22792 0 0 193 1761 4013 133 9 64 27

[....snipped]
Throughput 9.20907 MB/sec (NB=11.5113 MB/sec 92.0907 MBit/sec)
34.43user 255.59system 7:39.69elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 310780 5796 21920 0 0 175 2028 4511 113 9 72 19

[....snipped]
Throughput 9.88017 MB/sec (NB=12.3502 MB/sec 98.8017 MBit/sec)
33.30user 248.82system 7:08.54elapsed 65%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 311180 5356 22024 0 0 172 2124 4694 107 8 76 16