Q2Q — time between requests sent to the block layerQ2G — time from a block I/O is queued to the time it gets a request allocated for itG2I — time from a request is allocated to the time it is Inserted into the device’s queueQ2M — time from a block I/O is queued to ...
Q2G —timefrom ablockI/Oisqueuedtothetimeit gets a request allocatedforit G2I —timef rom a requestisallocatedtothetimeitisInserted into the device'squeue Q2M —timefrom ablockI/Oisqueuedtothetimeit gets mergedwithan existing request I2D —timefrom a requestisinserted into the device'squeue...
Q2G – 生成IO请求所消耗的时间,包括remap和split的时间; G2I – IO请求进入IO Scheduler所消耗的时间,包括merge的时间; I2D – IO请求在IO Scheduler中等待的时间; D2C – IO请求在driver和硬件上所消耗的时间; Q2C – 整个IO请求所消耗的时间(Q2I + I2D + D2C = Q2C),相当于iostat的await。 如果...
Q2G — time from a block I/O is queued to the time it gets a request allocated for it G2I — time from a request is allocated to the time it is Inserted into the device's queue Q2M — time from a block I/O is queued to the time it gets merged with an existing request I2...
Q2Q — time between requests sent to the block layer Q2G — time from a block I/O is queued to the time it gets a request allocated for it G2I — time from a request is allocated to the time it is Inserted into the device's queue ...
Q2Q — time between requests sent to the block layer Q2G — time from a block I/O is queued to the time it gets a request allocated for it G2I — time from a request is allocated to the time it is Inserted into the device's queue ...
Q2Q 0.000001140 0.000029558 0.012633253 33822 Q2G 0.000000169 0.000000473 0.000010757 8724 G2I 0.000000227 0.000000526 0.000005765 8724 Q2M 0.000000120 0.000000210 0.000011006 25099 I2D 0.000000239 0.000110426 0.012634319 8724 M2D 0.000000594 0.000232847 0.003048731 25099 ...
Q2Q–2个I/O请求的间隔时间。 分析结果来看 IO 卡在了 D2C 阶段(IO 请求在 Driver 和硬件上消耗的时间)。 5.2.3 也可以通过 blkparse 命令分析 代码语言:javascript 复制 // blkparse 直接进行分析blkparse-i sda120220915112930|less// 下图中第六个字段表示 IO 事件,待表 IO 请求到了哪一阶段A:remap ...
而iostat输出中的await,即整个IO从生成请求到IO请求执行完毕,即从Q到C所花费的时间,我们简称Q2C。 我们知道Linux 有I/O scheduler,调度器的效率如何,I2D是重要的指标。 注意,这只是blktrace输出的一个部分,很明显,我们还能拿到offset和size,根据offset,我们能拿到某一段时间里,应用程序都访问了整个块设备的那些...
Q2G – 生成IO请求所消耗的时间,包括remap和split的时间; G2I – IO请求进入IO Scheduler所消耗的时间,包括merge的时间; I2D – IO请求在IO Scheduler中等待的时间; D2C – IO请求在driver和硬件上所消耗的时间; Q2C – 整个IO请求所消耗的时间(Q2I + I2D + D2C = Q2C),相当于iostat的await。