proc hadoop

Each program in/proc has a directory named after the process number.The directory contains an EXE file, which is a link file and points to the path of the process.Use readlink to read the EXE file and return the full path of the processPit_t mypid = getpid ();Sprintf (strsrc, "/proc/% d/EXE ",Mypid );Readlink (strsrc, strdest, Len );On the other hand, based on whether the full path name of strsrc is consist

Max-file represents the number of file handles that can be opened at the system level. is a limitation on the entire system and is not intended for the user.Ulimit-n controls the number of file handles that the process level can open. Provides control over the file handles available to the shell and its initiated processes. This is process-level.For the server, both the File-max and the ulimit need to be set up, otherwise the file descriptor exhaustion problem will occur.In general if you encoun

Linux system/proc directory is stored in the current system running state information, as a file to save, such as CPU information file Cpuinfo, memory information file meminfo, disk information file diskstats.The meanings of each column in Diskstats are as follows:1 0 SDA 505235 28461 7421219 6259625 2397331 3804539 49818500 25885599 0 6122393 32152888Device number device read completed number of times read number of reads sector count read number of

general hyperthreading are considered older technology and are no longer supported in newer CPUs. HyperThreading can provide a marginal (10%) for some server workloads like MySQL, but dual core technology have essentially Replaced hyperthreading in newer systems.A Dual core CPU running at 3.0Ghz should is faster then a dual CPUs (separate core) system running at 3.0Ghz due to the ABI Lity to share the cache at higher bus speeds.The examples below details how do we determine what kind of CPU (s)

 1. Make proc precompiled commands available After/etc/profile, add the following:Ld_library_path= $ORACLE _home/lib:/usr/lib/usr/local/libExport Ld_library_path Note: Need to reboot 2. Configure Pcscfg.cfg files Pcscfg.cfg is located in the $oracle_home/precomp/admin/directory and is added after Pcscfg.cfg Sqlcheck=semantics Parse=none Parse=none to qualify all host variables must be defined in the declaration segment, and only precompiled dir

first, the introduction Proc file system, in the form of file system to provide users with the current state of the system, dynamically read the necessary information from the same kernel, only in memory, does not occupy the external space. Ii. content of the experiment Question A:1. CPU Type2, kernel version Question B:1, the time since the start of the system to DD:HH:MM:SS report Question C:1, CPU execution User state, System State, idle state tim

/proc/buddyinfo This file is used primarily for diagnosing memory fragmentation issues. Using The buddy algorithm, each column represents the number of pages of a certain order (a certain size) that are Availab Le at no given time. For example, for zone DMA (direct memory access), there are of 2^ (0*page_size) chunks of memory. Similarly, there are 6 of 2^ (1*page_size) chunks, and 2 of 2^ (2*page_size) chunks of memory available. The DMA row referenc

MySQL database can only be built to not delete the error message and processing methods:mysql> drop Database testmysqldatabase;ERROR 145 (HY000): Table './mysql/proc ' is marked as crashed and should be repairedProcessing method: Directly in the MySQL database with the root account login after the repair:mysql> Repair table Mysql.proc;+------------+--------+----------+----------+| Table | Op | Msg_type | Msg_text |+------------+--------+----------+---

Label: Operating system: Windows 7 Database version number: Oracle 10g VS Version number: VS2010 Introduction: There are many ways to connect Oracle, here only proc Shell, explain how to connect Oracle, what's the matter, I hope you tell me to point out, study together. First, install the corresponding client version number for Oracle 10g. Note: Do the customer configuration, take this machine as an example: D:\oracle\product\10.2.0\client_2\NETWORK\A

First explain the configured environmentSystem: Ubuntu14.0.4Ide:eclipse 4.4.1Hadoop:hadoop 2.2.0For older versions of Hadoop, you can directly replicate the Hadoop installation directory/contrib/eclipse-plugin/hadoop-0.20.203.0-eclipse-plugin.jar to the Eclipse installation directory/plugins/ (and not personally verified). For HADOOP2, you need to build the jar f

ArticleDirectory Obtain Java Obtain hadoop Set Environment Variables Configure hadoop-env.sh Configure core-site.xml Configure hdfs-site.xml Configure mapred-site.xml Install HDFS Start hadoop Simple debugging Obtain Java Obtain hadoop Set Environment Variables Configure

The analysis optimizes Hadoop from the Administrator's perspective, and the Administrator is responsible for providing an efficient running environment for user jobs. The administrator needs to adjust some key parameter values globally to improve the system throughput and performance. In general, administrators need to select hardware, operating system parameter optimization, JVM parameter optimization, and Hadoop