[PATCH v2 0/5] makedumpfile: --split: assign fair I/O workloads in appropriate time

"Zhou, Wenjian/周文剑" zhouwj-fnst at cn.fujitsu.com
Tue Oct 21 18:52:29 PDT 2014


On 10/17/2014 11:50 AM, Atsushi Kumagai wrote:
> Hello,
>
> The code looks good to me, thanks Zhou.
> Now, I have a question on performance.
>
>> The issue is discussed at http://lists.infradead.org/pipermail/kexec/2014-March/011289.html
>>
>> This patch implements the idea of 2-pass algorhythm with smaller memory to manage splitblock table.
>> Exactly the algorhythm is still 3-pass,but the time of second pass is much shorter.
>> The tables below show the performence with different size of cyclic-buffer and splitblock.
>> The test is executed on the machine having 128G memory.
>>
>> the value is total time (including first pass and second pass).
>> the value in brackets is the time of second pass.
>
> Do you have any idea why the time of second pass is much larger when
> the splitblock-size is 2G ? I worry about the scalability.
>
Hello,

	Since the previous machine can't be used for some reasons,I test several times using latest code
in others, but that never happened. It seems that all things are right. Tests are executed in two machines(server,pc).
Tests are based on:
		test1:
			machine:	server
			crashkernel:	512M
			vmcore:		/proc/vmcore (128G)
			
		
		test2:
			machine:	pc
			crashkernel:	256M
			vmcore:		vmcore dumped from the server
	
		test3:
			machine:	pc
			crashkernel:	128M
			vmcore:		vmcore dumped from the server



test1:
													      sec
		cyc-buf	2		4		8		16		32		64	
	splblk-size
	2M		1.53(0.00)	1.24(0.00)	1.08(0.01)	0.99(0.01)	0.95(0.01)	0.95(0.04)
	4M		1.52(0.00)	1.24(0.00)	1.08(0.01)	0.99(0.01)	0.95(0.01)	0.96(0.04)
	8M		1.53(0.00)	1.23(0.00)	1.08(0.01)	0.99(0.01)	0.95(0.01)	0.95(0.04)
	16M		1.53(0.00)	1.24(0.00)	1.08(0.01)	1.00(0.01)	0.94(0.01)	0.96(0.04)
	32M		1.52(0.00)	1.25(0.00)	1.08(0.01)	0.99(0.01)	0.94(0.01)	0.96(0.05)
	64M		1.52(0.00)	1.23(0.00)	1.07(0.01)	0.99(0.01)	0.97(0.01)	0.96(0.05)
	128M		1.54(0.01)	1.25(0.01)	1.08(0.01)	0.99(0.01)	0.96(0.02)	0.96(0.05)
	256M		1.53(0.01)	1.25(0.01)	1.08(0.01)	0.99(0.01)	0.95(0.02)	0.96(0.05)
	512M		1.53(0.01)	1.25(0.01)	1.07(0.01)	1.01(0.02)	0.95(0.02)	0.96(0.05)
	1G		1.54(0.02)	1.25(0.02)	1.08(0.02)	1.00(0.02)	0.96(0.03)	0.97(0.06)
	2G		1.59(0.07)	1.30(0.06)	1.11(0.05)	1.04(0.06)	1.00(0.07)	0.98(0.07)
	4G		1.60(0.08)	1.31(0.07)	1.14(0.07)	1.05(0.07)	1.02(0.08)	1.00(0.08)
	8G		1.60(0.08)	1.31(0.07)	1.14(0.07)	1.05(0.07)	1.02(0.08)	0.99(0.08)
	16G		1.60(0.08)	1.30(0.07)	1.14(0.07)	1.05(0.07)	1.02(0.08)	0.99(0.08)
	
		cyc-buf	128		256		512		1024		2048		4096	
	splblk-size
	2M		0.95(0.04)	0.94(0.04)	0.94(0.04)	0.95(0.05)	0.94(0.05)	1.68(0.78)
	4M		0.95(0.04)	0.94(0.04)	0.94(0.04)	0.95(0.05)	0.94(0.05)	1.67(0.78)
	8M		0.94(0.04)	0.94(0.04)	0.94(0.04)	0.95(0.05)	0.95(0.05)	1.68(0.78)
	16M		0.96(0.05)	0.94(0.04)	0.95(0.05)	0.94(0.04)	0.94(0.05)	1.68(0.78)
	32M		0.95(0.05)	0.94(0.05)	0.94(0.05)	0.94(0.05)	0.94(0.05)	1.68(0.78)
	64M		0.96(0.05)	0.95(0.05)	0.94(0.05)	0.94(0.05)	0.95(0.05)	1.67(0.78)
	128M		0.96(0.05)	0.95(0.05)	0.95(0.05)	0.95(0.05)	0.94(0.05)	1.67(0.78)
	256M		0.95(0.05)	0.95(0.05)	0.95(0.05)	0.94(0.05)	0.94(0.05)	1.67(0.78)
	512M		0.96(0.05)	0.95(0.05)	0.94(0.05)	0.94(0.05)	0.95(0.05)	1.68(0.79)
	1G		0.96(0.06)	0.96(0.06)	0.97(0.06)	0.96(0.06)	0.96(0.07)	1.69(0.80)
	2G		0.97(0.07)	0.97(0.07)	0.97(0.07)	0.96(0.07)	0.96(0.07)	1.70(0.80)
	4G		1.02(0.10)	1.00(0.10)	0.99(0.10)	1.00(0.10)	0.99(0.10)	1.74(0.84)
	8G		1.00(0.10)	1.06(0.16)	1.05(0.16)	1.05(0.16)	1.06(0.16)	1.78(0.89)
	16G		1.00(0.10)	1.06(0.16)	1.16(0.26)	1.16(0.26)	1.15(0.26)	1.90(1.00)




test2:
														sec
		cyc-buf	2		4		8		16		32		64	
	splblk-size
	2M		23.42(0.03)	23.38(0.05)	23.46(0.11)	23.56(0.17)	23.56(0.23)	23.84(0.48)
	4M		23.35(0.03)	23.35(0.05)	23.56(0.11)	23.51(0.17)	23.60(0.22)	23.81(0.48)
	8M		23.34(0.03)	23.38(0.05)	23.46(0.11)	23.55(0.16)	23.58(0.22)	23.84(0.48)
	16M		23.39(0.03)	23.36(0.06)	23.42(0.11)	23.50(0.16)	23.59(0.23)	23.86(0.48)
	32M		23.43(0.03)	23.38(0.06)	23.47(0.12)	23.54(0.19)	23.58(0.23)	23.89(0.48)
	64M		23.42(0.04)	23.43(0.07)	23.47(0.12)	23.53(0.18)	23.59(0.23)	23.87(0.48)
	128M		23.45(0.07)	23.41(0.09)	23.52(0.14)	23.56(0.19)	23.59(0.23)	23.81(0.48)
	256M		23.47(0.12)	23.48(0.14)	23.50(0.14)	23.55(0.20)	23.62(0.23)	23.84(0.48)
	512M		23.48(0.18)	23.56(0.19)	23.55(0.19)	23.60(0.24)	23.71(0.32)	23.88(0.49)
	1G		23.74(0.30)	23.53(0.23)	23.64(0.31)	23.54(0.24)	23.65(0.27)	23.98(0.52)
	2G		23.78(0.48)	23.82(0.48)	23.84(0.48)	23.83(0.49)	23.89(0.52)	23.84(0.52)
	4G		23.91(0.52)	23.81(0.50)	23.92(0.50)	23.87(0.51)	23.88(0.54)	23.92(0.54)
	8G		23.80(0.50)	23.90(0.52)	23.82(0.49)	23.84(0.51)	23.90(0.54)	23.90(0.54)
	16G		23.85(0.51)	23.86(0.50)	23.85(0.51)	23.87(0.51)	23.95(0.54)	23.88(0.54)
		
		cyc-buf	128		256		512		1024		2048		4096	
	splblk-size
	2M		23.90(0.47)	23.84(0.48)	23.84(0.48)	24.06(0.47)	23.93(0.47)	49.00(25.46)
	4M		23.87(0.48)	23.84(0.48)	23.91(0.48)	23.93(0.47)	23.98(0.47)	49.00(25.46)
	8M		23.80(0.48)	23.81(0.48)	23.95(0.48)	23.95(0.47)	24.03(0.52)	49.05(25.45)
	16M		23.86(0.47)	23.84(0.48)	23.90(0.48)	23.93(0.47)	24.00(0.47)	48.95(25.41)
	32M		23.86(0.48)	23.82(0.48)	23.98(0.54)	23.99(0.47)	23.97(0.47)	49.03(25.47)
	64M		23.83(0.48)	23.79(0.48)	23.89(0.48)	24.02(0.47)	23.93(0.47)	48.96(25.49)
	128M		23.92(0.55)	23.91(0.48)	23.85(0.48)	23.98(0.47)	23.90(0.47)	48.98(25.50)
	256M		23.86(0.48)	23.88(0.48)	24.00(0.48)	24.17(0.47)	23.94(0.47)	49.01(25.50)
	512M		23.85(0.49)	23.89(0.55)	23.93(0.49)	23.91(0.48)	24.01(0.48)	49.12(25.54)
	1G		23.85(0.52)	23.84(0.52)	23.98(0.52)	23.98(0.51)	24.02(0.51)	49.28(25.73)
	2G		23.92(0.52)	23.87(0.52)	23.93(0.52)	24.11(0.52)	24.04(0.52)	49.27(25.77)
	4G		24.24(0.91)	24.31(0.91)	24.29(0.91)	24.37(0.90)	24.37(0.90)	50.01(26.49)
	8G		24.27(0.91)	24.94(1.61)	25.07(1.62)	25.11(1.60)	25.02(1.60)	51.24(27.77)
	16G		24.29(0.91)	24.98(1.63)	29.32(5.85)	29.34(5.83)	29.33(5.83)	53.91(30.43)	




test3:
														sec
		cyc-buf	2		4		8		16		32		64	
	splblk-size
	2M		23.34(0.03)	23.38(0.05)	23.46(0.11)	23.47(0.16)	23.55(0.22)	23.97(0.65)
	4M		23.38(0.03)	23.41(0.05)	23.46(0.11)	23.47(0.16)	23.56(0.22)	23.99(0.65)
	8M		23.33(0.03)	23.41(0.06)	23.50(0.11)	23.52(0.16)	23.54(0.23)	24.05(0.66)
	16M		23.38(0.03)	23.51(0.14)	23.46(0.12)	23.54(0.16)	23.57(0.23)	23.98(0.65)
	32M		23.34(0.03)	23.37(0.06)	23.47(0.12)	23.53(0.18)	23.56(0.23)	24.06(0.66)
	64M		23.36(0.06)	23.43(0.08)	23.52(0.13)	23.53(0.18)	23.63(0.23)	23.99(0.66)
	128M		23.47(0.07)	23.40(0.09)	23.54(0.15)	23.50(0.19)	23.57(0.23)	24.15(0.74)
	256M		23.48(0.13)	23.52(0.14)	23.50(0.15)	23.54(0.19)	23.56(0.23)	23.98(0.66)
	512M		23.49(0.18)	23.49(0.19)	23.60(0.20)	23.66(0.32)	23.64(0.23)	24.15(0.75)
	1G		23.58(0.23)	23.54(0.23)	23.62(0.24)	23.57(0.24)	23.64(0.27)	24.17(0.81)
	2G		24.00(0.65)	23.99(0.66)	24.01(0.67)	24.01(0.70)	24.13(0.80)	24.43(0.82)
	4G		24.04(0.66)	23.97(0.67)	24.05(0.71)	24.04(0.73)	24.15(0.82)	24.18(0.83)
	8G		23.97(0.66)	24.06(0.67)	23.98(0.68)	24.07(0.73)	24.13(0.81)	24.16(0.83)
	16G		24.05(0.66)	24.03(0.68)	24.02(0.68)	24.08(0.72)	24.18(0.82)	24.16(0.83)
	
		cyc-buf	128		256		512		1024		2048		4096	
	splblk-size
	2M		24.05(0.65)	24.04(0.65)	24.58(0.65)	24.15(0.64)	24.14(0.64)	49.05(25.46)
	4M		23.98(0.65)	24.01(0.65)	24.29(0.65)	24.20(0.64)	24.18(0.66)	49.04(25.46)
	8M		24.02(0.65)	24.03(0.65)	24.25(0.65)	24.26(0.70)	24.15(0.64)	48.98(25.44)
	16M		24.01(0.65)	24.01(0.65)	24.30(0.65)	24.19(0.64)	24.12(0.65)	48.99(25.45)
	32M		23.97(0.65)	24.06(0.73)	24.23(0.65)	24.17(0.64)	24.19(0.64)	48.97(25.50)
	64M		24.06(0.66)	24.07(0.66)	24.27(0.66)	24.16(0.65)	24.17(0.65)	48.98(25.49)
	128M		24.03(0.67)	24.00(0.67)	24.27(0.66)	24.22(0.66)	24.19(0.66)	48.98(25.48)
	256M		24.12(0.67)	23.99(0.67)	24.27(0.67)	24.17(0.66)	24.12(0.66)	49.04(25.49)
	512M		24.06(0.70)	24.08(0.70)	24.26(0.70)	24.14(0.71)	24.19(0.70)	49.13(25.64)
	1G		24.20(0.82)	24.13(0.81)	24.36(0.81)	24.31(0.80)	24.33(0.81)	49.28(25.75)
	2G		24.19(0.81)	24.22(0.81)	24.37(0.81)	24.29(0.80)	24.28(0.82)	49.30(25.78)
	4G		25.29(1.90)	25.26(1.91)	25.49(1.91)	25.41(1.89)	25.50(1.90)	49.99(26.45)
	8G		25.33(1.90)	26.60(3.23)	26.87(3.21)	26.71(3.23)	26.64(3.22)	51.27(27.73)
	16G		25.28(1.90)	26.52(3.21)	29.47(5.86)	29.34(5.84)	29.38(5.86)	53.99(30.40)


	
Thanks
Zhou Wenjian



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