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Overview

This document contains helpful info for CentOS system tuning.

blktrace

sudo mount -t debugfs debugfs /sys/kernel/debug

sudo blktrace -d /dev/mapper/VolGroup00-LogVol02 -o - | blkparse -i -

Stats while starting up Confluence on wiki-dev:


CPU0 (253,2):
 Reads Queued:       4,808,  133,060KiB	 Writes Queued:      40,011,  160,044KiB
 Read Dispatches:        0,        0KiB	 Write Dispatches:        0,        0KiB
 Reads Requeued:         0		 Writes Requeued:         0
 Reads Completed:    4,808,  133,060KiB	 Writes Completed:   40,011,  160,044KiB
 Read Merges:            0,        0KiB	 Write Merges:            0,        0KiB
 Read depth:             0        	 Write depth:             0
 IO unplugs:         3,599        	 Timer unplugs:           0

Throughput (R/W): 148KiB/s / 179KiB/s
Events (253,2): 93,237 entries
Skips: 0 forward (0 -   0.0%)
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