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在作网络程序的时候, 经常需要了解interrupts和软中断的平衡情况, 需要知道每秒有多少中断发生,发生在哪个cpu上. Linux下中断来源可以从 /proc/interrupts 中了解到: $ cat /proc/interrupts CPU0 CPU1 0: 247701 250313 IO-APIC-edge timer 1: 501 567 IO-APIC-edge i8042 3: 1 1 IO-APIC-edge 8: 1 0 IO-APIC-edge rtc0 9: 256 240 IO-APIC-fasteoi acpi 12: 1134 1149 IO-APIC-edge i8042 16: 629 554 IO-APIC-fasteoi nvidia 17: 21313 20869 IO-APIC-fasteoi firewire_ohci, eth1 18: 0 0 IO-APIC-fasteoi mmc0 19: 51822 50079 IO-APIC-fasteoi ata_piix, ata_piix 20: 5605 5255 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb6 21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4, uhci_hcd:usb7 22: 33 33 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb5, uhci_hcd:usb8 45: 337 247 PCI-MSI-edge eth0 46: 441 447 PCI-MSI-edge hda_intelNMI: 0 0 Non-maskable interruptsLOC: 169176 174899 Local timer interruptsSPU: 0 0 Spurious interruptsPMI: 0 0 Performance monitoring interruptsPND: 0 0 Performance pending workRES: 42289 40236 Rescheduling interruptsCAL: 154 1076 Function call interruptsTLB: 5838 5365 TLB shootdownsTRM: 0 0 Thermal event interruptsTHR: 0 0 Threshold APIC interruptsMCE: 0 0 Machine check exceptionsMCP: 5 5 Machine check pollsERR: 1MIS: 0 软中断可以从/proc/softirqs 了解到: $ cat /proc/softirqs CPU0 CPU1 HI: 0 0 TIMER: 160508 1170976 NET_TX: 2 2 NET_RX: 3303 3165 BLOCK: 50964 49198BLOCK_IOPOLL: 0 0 TASKLET: 24743 24284 SCHED: 39483 41848 HRTIMER: 34 40 RCU: 92193 92592 总的中断次数可以从vmstat或者dstat了解到: $ vmstatprocs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 3 0 0 44160 327144 876600 0 0 894 584 458 2295 11 5 70 15 top提供了更方便的方式了解,作者Hunz在源码里面写: It’s quite simple but it does its job. 虽然简单,但是适用: Ubutun下可以这样安装: apt-get install itop $ itopINT NAME RATE MAX 0 [PIC-edge time] 628 Ints/s (max: 628) 1 [PIC-edge i804] 4 Ints/s (max: 4) 17 [PIC-fasteoi fire] 8 Ints/s (max: 22) 19 [PIC-fasteoi ata_] 1 Ints/s (max: 14) 20 [PIC-fasteoi ehci] 25 Ints/s (max: 25) 45 [MSI-edge eth0] 1 Ints/s (max: 1) 他会计算每秒每个中断源中断的次数,看起来比较方便. 祝玩的开心! |
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