linux ionice

As a VPS service provider we need to ensure that each VPS fair use of the host (server) resources, to avoid a certain VPS due to program death cycle, hang, abuse and other factors "drag" other VPs, if this happens how to temporarily limit the VPS

Linux performance tuning 6: selecting IO scheduling algorithms 5: optimizing soft raidhttp: // www.2cto.com/ OS /201307/228240.html1) summary of I/O scheduling program 1) when a data block is written to the device or read from the device, the

  Development Environment HOST: Linux 2.6.ora 2.6.27.5-117. fc10.i686Cross-compiling environment: arm-linux-gcc-3.4.5 glibc-2.3.6Software Tools: H-JTAG V1.0, segger J-link Commander v4.10i, codewarrior for ARM Developer Suite v1.2,

1, testing the distributor system to meet the requirements, the kernel is more than 2.3Uname-r #查看系统内核 ll/proc/sys/fs/inotify/　　Meet the requirements.2. Download the latest version and compile the installation on the Distributor serverCD

I) Summary of the I/O Scheduler 1) when a data block is written to or read from the device, the request is placed in a queue waiting for completion.2) each block device has its own queue.3) the I/O scheduler is responsible for maintaining the order

RsyncUsage:/etc/init.d/rsync {start|stop|reload|force-reload|restart|status}Rsync Default configuration file# defaults file for rsync daemon mode# start rsync in daemon mode from INIT.D script?# only allowed values is "true", "false", and "inetd"#

ObjectiveThe content of this chapter, design more things. There will be a file system, disk, CPU and other aspects of knowledge, as well as related to the performance of the investigation and so on.TermsThe file system alleviates the impact of disk

CFQ scheduler is one of the most complex of the four Io scheduler, RedHat has a document that can be used as an entry to understand the red-hat-enterprise-linux-5-io-tuning-guide.pdf first The CFQ scheduler maintains a maximum of 64 internal

First, memory tuning The kernel's options for memory are in the/PROC/SYS/VM directory. 1.pdflush, used to write back the dirty data in memory to the hard disk. Can be adjusted by/proc/sys/vm/vm.dirty_background_ratio. The first view of this value

Linux Command -- iotop to view CPU usage use top. iotop is required to view I/O usage. This command is added in kernel v2.6.20. Pay attention to the kernel version number during installation. Common iotop Shortcut Keys 1. the left and right arrows --