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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:
0: 247701 250313 IO-APIC-edge timer |
1: 501 567 IO-APIC-edge i8042 |
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_intel |
NMI: 0 0 Non-maskable interrupts |
LOC: 169176 174899 Local timer interrupts |
SPU: 0 0 Spurious interrupts |
PMI: 0 0 Performance monitoring interrupts |
PND: 0 0 Performance pending work |
RES: 42289 40236 Rescheduling interrupts |
CAL: 154 1076 Function call interrupts |
TLB: 5838 5365 TLB shootdowns |
TRM: 0 0 Thermal event interrupts |
THR: 0 0 Threshold APIC interrupts |
MCE: 0 0 Machine check exceptions |
MCP: 5 5 Machine check polls |
软中断可以从/proc/softirqs 了解到:
总的中断次数可以从vmstat或者dstat了解到:
procs -----------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 |
itop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
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!
转载请注明：爱开源 » itop更方便的了解Linux下中断情况