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proc ³ª snmp ÀÇ °ªÀ» ÀÌ¿ëÇÏ¿©, cpu counter ¸¦ ±¸ÇÏ´Â °ø½Ä



1. Count ¹æ½ÄÀ¸·Î CPU¸¦ ÃøÁ¤ÇØ¾ß ÇÏ´Â ÀÌÀ¯

  • LinuxÀÇ °æ¿ì snmp¿¡¼­ º¸¿©ÁÖ´Â CPU »ç¿ë·®Àº ºÎÆýà ºÎÅÍÀÇ Æò±Õ°ªÀ̹ǷΠ¼º´É ÃøÁ¤½Ã °í·Á´ë»óÀÌ ¾ÈµÊ.
  • º¸Åë Linux ÀÇ °æ¿ì cronjob ¿¡ ÀÇÇÑ °á°ú¹°À» ÀÌ¿ëÇÏ¿© guage ·Î cpu usage ¸¦ ±×¸®´Â °æ¿ì°¡ ¸¹À½
  • guage °ªÀº rrd database ¸¦ update ÇÒ ´ç½ÃÀÇ °ªÀ̹ǷÎ, ÀÌÀü°ªÀ» ¾÷µ¥ÀÌÆ® ÇÏ´Â ¼ø°£ ºÎÅÍ ÇöÀç°ªÀ» ¾÷µ¥ÀÌÆ® ÇÏ´Â ½Ã°£»çÀÌÀÇ »ç¿ë·üÀº ÀüÇô ¹Ý¿µµÇÁö ¸øÇÔ.

2. ÇØ°á¹æ¹ý

  • UCD-SNMP-MIB (.1.3.6.1.4.1.2021) ÀÇ CPU °ü·Ã Counter ¸¦ ÀÌ¿ëÇÏ¿© °ªÀ» ±¸ÇÔ
    • user => UCD-SNMP-MIB::ssCpuRawUser.0
    • nice => UCD-SNMP-MIB::ssCpuRawNice.0
    • sys => UCD-SNMP-MIB::ssCpuRawSystem.0
    • idle => UCD-SNMP-MIB::ssCpuRawIdle.0
    • wait => UCD-SNMP-MIB::ssCpuRawWait.0
    • intr => UCD-SNMP-MIB::ssCpuRawInterrupt.0
    • irqt => UCD-SNMP-MIB::ssCpuRawSoftIRQ.0

  • counter ¹æ½ÄÀ̱⠶§¹®¿¡ °¢ °ªÀÇ 2 ÁöÁ¡(½Ã°£»ó) ÀÇ Â÷À̸¦ ±¸Çϵµ·Ï ÇÑ´Ù.
    • ¿¹) user = userpost - userpref

  • scale = 100.0 / (user + nice + sys + idle + wait + intr + irqt)
  • user = (user + nice) * scale
  • sys = (sys + intr + irqt) * scale
  • idle *= scale
  • idwait *= scale

3. Âü°í

  • linux kernel 2.4 ¿¡¼­´Â ¶Ç´Â (´Ù¸¥ OS ¿¡¼­´Â) IOWAIT/Interrupt/SoftIRQ ¿¡ ´ëÇÑ Counter °¡ ¾øÀ» ¼öµµ ÀÖÀ¸¹Ç·Î ¿¹¿Ü 󸮸¦ ¿°µÎ¿¡ µÎ¾î¾ß ÇÑ´Ù.


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