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SubjectRe: [patch] sched-2.5.59-A2
Date
The scan through a piece of the parameter space delivered quite
unconclusive results. I used the IDLE_NODE_REBALANCE_TICK multipliers
2, 5, 10, 20, 50 and the BUSY_NODE_REBALANCE_TICK multipliers 2, 5,
10, 20.

The benchmarks I tried were kernbench (average and error of 5 kernel
compiles) and hackbench (5 runs for each number of chatter groups
(10,25,50,100). The 2.5.59 scheduler result is printed first, then a
matrix with all combinations of idle and busy rebalance
multipliers. Each value is followed by its standard error (coming from
the 5 measurements). I didn't measure numa_bench, those values depend
mostly on the initial load balancing and showed no clear
tendency/difference.

The machine is an NEC TX7 (small version, 8 Itanium2 CPUs in 4 nodes).

The results:
- kernbench UserTime is best for the 2.5.59 scheduler (623s). IngoB0
best value 627.33s for idle=20ms, busy=2000ms.
- hackbench: 2.5.59 scheduler is significantly better for all
measurements.

I suppose this comes from the fact that the 2.5.59 version has the
chance to load_balance across nodes when a cpu goes idle. No idea what
other reason it could be... Maybe anybody else?

Kernbench:
==========
2.5.59 : Elapsed = 86.29(1.24)
ingo B0 : Elapsed
idle 2 5 10 20 50
busy
2 86.25(0.45) 86.62(1.56) 86.29(0.99) 85.99(0.60) 86.91(1.09)
5 86.87(1.12) 86.38(0.82) 86.00(0.69) 86.14(0.39) 86.47(0.68)
10 86.06(0.18) 86.23(0.38) 86.63(0.57) 86.82(0.95) 86.06(0.15)
20 86.64(1.24) 86.43(0.74) 86.15(0.99) 86.76(1.34) 86.70(0.68)

2.5.59 : UserTime = 623.24(0.46)
ingo B0 : UserTime
idle 2 5 10 20 50
busy
2 629.05(0.32) 628.54(0.53) 628.51(0.32) 628.66(0.23) 628.72(0.20)
5 628.14(0.88) 628.10(0.76) 628.33(0.41) 628.45(0.48) 628.11(0.37)
10 627.97(0.30) 627.77(0.23) 627.75(0.21) 627.33(0.45) 627.63(0.52)
20 627.55(0.36) 627.67(0.58) 627.36(0.67) 627.84(0.28) 627.69(0.59)

2.5.59 : SysTime = 21.83(0.16)
ingo B0 : SysTime
idle 2 5 10 20 50
busy
2 21.99(0.26) 21.89(0.12) 22.12(0.16) 22.06(0.21) 22.44(0.51)
5 22.07(0.21) 22.29(0.54) 22.15(0.08) 22.09(0.26) 21.90(0.18)
10 22.01(0.20) 22.42(0.42) 22.28(0.23) 22.04(0.37) 22.41(0.26)
20 22.03(0.20) 22.08(0.30) 22.31(0.27) 22.03(0.19) 22.35(0.33)


Hackbench 10
=============
2.5.59 : 0.77(0.03)
ingo B0:
idle 2 5 10 20 50
busy
2 0.90(0.07) 0.88(0.05) 0.84(0.05) 0.82(0.04) 0.85(0.06)
5 0.87(0.05) 0.90(0.07) 0.88(0.08) 0.89(0.09) 0.86(0.07)
10 0.85(0.06) 0.83(0.05) 0.86(0.08) 0.84(0.06) 0.87(0.06)
20 0.85(0.05) 0.87(0.07) 0.83(0.05) 0.86(0.07) 0.87(0.05)

Hackbench 25
=============
2.5.59 : 1.96(0.05)
ingo B0:
idle 2 5 10 20 50
busy
2 2.20(0.13) 2.21(0.12) 2.23(0.10) 2.20(0.10) 2.16(0.07)
5 2.13(0.12) 2.17(0.13) 2.18(0.08) 2.10(0.11) 2.16(0.10)
10 2.19(0.08) 2.21(0.12) 2.22(0.09) 2.11(0.10) 2.15(0.10)
20 2.11(0.17) 2.13(0.08) 2.18(0.06) 2.13(0.11) 2.13(0.14)

Hackbench 50
=============
2.5.59 : 3.78(0.10)
ingo B0:
idle 2 5 10 20 50
busy
2 4.31(0.13) 4.30(0.29) 4.29(0.15) 4.23(0.20) 4.14(0.10)
5 4.35(0.16) 4.34(0.24) 4.24(0.24) 4.09(0.18) 4.12(0.14)
10 4.35(0.23) 4.21(0.14) 4.36(0.24) 4.18(0.12) 4.36(0.21)
20 4.34(0.14) 4.27(0.17) 4.18(0.18) 4.29(0.24) 4.08(0.09)

Hackbench 100
==============
2.5.59 : 7.85(0.37)
ingo B0:
idle 2 5 10 20 50
busy
2 8.21(0.42) 8.07(0.25) 8.32(0.30) 8.06(0.26) 8.10(0.13)
5 8.13(0.25) 8.06(0.33) 8.14(0.49) 8.24(0.24) 8.04(0.20)
10 8.05(0.17) 8.16(0.13) 8.13(0.16) 8.05(0.24) 8.01(0.30)
20 8.21(0.25) 8.23(0.24) 8.36(0.41) 8.30(0.37) 8.10(0.30)


Regards,
Erich

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