* [BENCHMARKS] AS scheduler
@ 2003-05-06 3:26 Nick Piggin
0 siblings, 0 replies; only message in thread
From: Nick Piggin @ 2003-05-06 3:26 UTC (permalink / raw)
To: linux-kernel; +Cc: piggin, akpm
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Hi,
Here are a few benchmarks with the rq-dyn patch in. Most differences are
probably due to larger queues. Regressions in Contest io_load, improvement
in OraSim. tiobench shows random IO and streaming write throughput gains
and general improvement in latency.
Right now it appears AS is only really beaten by deadline when using
big TCQ windows. The cause seems to be that deadline will stuff as
many requests into the disk as possible, allowing a massive rescheduling
window, while AS is more selective. Now AS schedules quite well, so I'm
inclined to think that some deadline+TCQ improvements are at the expense
of fairness, although the AS scheduler definitely has room for
improvement.
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Cat kernel source during seq read
65-mm4-dl - 0.03user 0.13system 5:21.39elapsed
65-mm4-as - 0.02user 0.14system 0:14.50elapsed
69-mm1-as - 0.01user 0.11system 0:14.23elapsed
Cat kernel source during seq write
65-mm4-dl - 0.03user 0.14system 14:06.45elapsed
65-mm4-as - 0.02user 0.14system 0:16.33elapsed
69-mm1-as - 0.02user 0.12system 0:19.50elapsed
ls -lr kernel source during seq read
65-mm4-dl - 0.18user 0.31system 0:24.32elapsed
65-mm4-as - 0.19user 0.32system 0:09.39elapsed
69-mm1-as - 0.17user 0.33system 0:10.21elapsed
ls -lr kernel source during seq write
65-mm4-dl - 0.23user 0.34system 1:13.90elapsed
65-mm4-as - 0.18user 0.32system 0:05.49elapsed
69-mm1-as - 0.18user 0.32system 0:05.82elapsed
Contest
no_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
65-mm4-dl 1 69 95.7 0.0 0.0 1.00
65-mm4-as 1 69 95.7 0.0 0.0 1.00
69-mm1-as 1 69 95.7 0.0 0.0 1.00
io_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
65-mm4-dl 1 149 46.3 121.0 22.8 2.16
65-mm4-as 1 100 70.0 81.2 22.0 1.45
69-mm1-as 1 122 56.6 73.8 16.8 1.77
read_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
65-mm4-dl 1 91 78.0 12.8 6.6 1.32
65-mm4-as 1 100 72.0 15.6 8.0 1.45
69-mm1-as 1 110 64.5 18.4 7.3 1.59
list_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
65-mm4-dl 1 87 78.2 5.0 18.4 1.26
65-mm4-as 1 94 72.3 6.0 19.1 1.36
69-mm1-as 1 93 72.0 6.0 19.4 1.35
tiobench
Unit information
================
File size = 1024MB
Blk Size = 4096B
Sequential Reads
Num Avg Maximum Lat% Lat% CPU
Identifier Thr Rate (CPU%) Latency Latency >2s >10s Eff
--------------- --- ------ ------ --------- ----------- ----- ------ -----
65-mm4-dl 1 48.21 11.09% 0.080 36.49 0.00 0.00 435
65-mm4-dl 4 11.47 2.500% 1.358 86.84 0.00 0.00 459
65-mm4-dl 16 13.18 3.049% 4.704 311.43 0.00 0.00 432
65-mm4-dl 256 10.32 2.489% 58.877 69755.23 0.09 0.07 414
65-mm4-as 1 49.23 11.52% 0.078 28.10 0.00 0.00 427
65-mm4-as 4 39.56 9.461% 0.387 217.46 0.00 0.00 418
65-mm4-as 16 37.81 8.902% 1.571 929.76 0.00 0.00 425
65-mm4-as 256 33.10 7.822% 17.405 26072.15 0.25 0.05 423
69-mm1-as 1 49.54 12.81% 0.078 35.14 0.00 0.00 387
69-mm1-as 4 37.74 8.592% 0.398 285.66 0.00 0.00 439
69-mm1-as 16 36.38 8.247% 1.639 970.25 0.00 0.00 441
69-mm1-as 256 34.16 8.897% 18.615 12700.17 0.33 0.01 384
Random Reads
65-mm4-dl 1 0.59 0.488% 6.647 23.35 0.00 0.00 120
65-mm4-dl 4 0.59 0.178% 26.003 96.85 0.00 0.00 332
65-mm4-dl 16 0.67 0.327% 88.082 403.66 0.00 0.00 206
65-mm4-dl 256 0.61 0.480% 1064.411 16058.51 3.02 2.68 127
65-mm4-as 1 0.57 0.504% 6.829 28.33 0.00 0.00 113
65-mm4-as 4 0.63 0.584% 23.283 220.36 0.00 0.00 108
65-mm4-as 16 0.63 0.624% 87.513 596.26 0.00 0.00 101
65-mm4-as 256 0.85 0.852% 659.708 14613.03 13.15 1.04 99
69-mm1-as 1 0.58 0.578% 6.777 22.33 0.00 0.00 100
69-mm1-as 4 0.63 0.258% 23.826 149.64 0.00 0.00 244
69-mm1-as 16 0.67 0.393% 83.469 832.59 0.00 0.00 170
69-mm1-as 256 0.87 0.478% 719.347 6396.50 16.12 0.00 181
Sequential Writes
65-mm4-dl 1 42.85 20.66% 0.082 992.45 0.00 0.00 207
65-mm4-dl 4 43.04 20.94% 0.291 1104.10 0.00 0.00 205
65-mm4-dl 16 37.10 17.68% 1.188 6594.20 0.02 0.00 210
65-mm4-dl 256 29.38 14.76% 15.689 30675.42 0.17 0.06 199
65-mm4-as 1 44.15 21.43% 0.080 1025.37 0.00 0.00 206
65-mm4-as 4 40.94 19.79% 0.299 1087.51 0.00 0.00 207
65-mm4-as 16 35.62 16.89% 1.220 5965.63 0.02 0.00 211
65-mm4-as 256 28.20 14.15% 16.388 33732.92 0.17 0.06 199
69-mm1-as 1 42.40 19.64% 0.084 1067.87 0.00 0.00 216
69-mm1-as 4 47.81 23.50% 0.275 2027.28 0.00 0.00 203
69-mm1-as 16 46.36 26.59% 1.013 2389.64 0.00 0.00 174
69-mm1-as 256 44.87 45.00% 8.772 22170.39 0.15 0.00 100
Random Writes
65-mm4-dl 1 0.81 0.467% 0.033 32.69 0.00 0.00 174
65-mm4-dl 4 0.79 0.509% 0.934 75.36 0.00 0.00 155
65-mm4-dl 16 0.81 0.484% 3.573 518.44 0.00 0.00 166
65-mm4-dl 256 0.99 0.561% 48.837 7073.10 0.60 0.00 176
65-mm4-as 1 0.82 0.472% 0.034 32.15 0.00 0.00 174
65-mm4-as 4 0.81 0.518% 0.818 137.50 0.00 0.00 156
65-mm4-as 16 0.79 0.516% 4.735 476.85 0.00 0.00 153
65-mm4-as 256 0.94 0.524% 79.319 7416.65 0.96 0.00 179
69-mm1-as 1 1.04 0.539% 0.102 28.27 0.00 0.00 193
69-mm1-as 4 1.07 0.554% 0.768 105.72 0.00 0.00 193
69-mm1-as 16 1.13 0.566% 2.912 376.10 0.00 0.00 200
69-mm1-as 256 1.07 0.577% 40.617 9585.90 0.23 0.00 185
OraSim (bigger is better)
65-mm4-dl - 132, 144
65-mm4-as - 129, 140
69-mm1-as - 158, 161
nickbench (IO rate is total combined throughput)
Bench 2 - 2 threads, streaming reader and streaming writer
65-mm4-dl - IO Rate: 33.36 MB/s, Reads per write: 0.08
65-mm4-as - IO Rate: 42.19 MB/s, Reads per write: 2.08
69-mm1-as - IO Rate: 43.29 MB/s, Reads per write: 2.40
Bench 3 - 2 threads, streaming readers
65-mm4-dl - IO Rate: 12.64 MB/s, Reads per read: 0.95
65-mm4-as - IO Rate: 45.56 MB/s, Reads per read: 1.00
69-mm1-as - IO Rate: 44.34 MB/s, Reads per read: 0.97
Bench 4 - 2 threads, streaming writers
65-mm4-dl - IO Rate: 38.59 MB/s, Writes per write: 1.45
65-mm4-as - IO Rate: 40.64 MB/s, Writes per write: 1.68
69-mm1-as - IO Rate: 37.65 MB/s, Writes per write: 0.80
Bench 5 - 1 thread, read then write each block of 1 file
65-mm4-dl - IO Rate: 40.24 MB/s, CPU time per byte: 4732.421875 us/B
65-mm4-as - IO Rate: 45.30 MB/s, CPU time per byte: 5238.281250 us/B
69-mm1-as - IO Rate: 44.10 MB/s, CPU time per byte: 4991.429688 us/B
Bench 6 - 4 threads, streaming readers
65-mm4-dl - IO Rate: 11.87 MB/s, Greatest unfairness between 4 readers: 0.95
65-mm4-as - IO Rate: 44.89 MB/s, Greatest unfairness between 4 readers: 0.95
69-mm1-as - IO Rate: 44.84 MB/s, Greatest unfairness between 4 readers: 0.94
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2003-05-06 3:26 [BENCHMARKS] AS scheduler Nick Piggin
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