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, and the use of swap space does not mark the occurrence of a memory bottleneck. Parameters useful for the free command:The references-b,-k,-m and-G respectively follow bytes, kilobytes, megabytes, gigabytes display results.-l difference shows low and high memory-c {count} shows the number of free outputsNine, PmapThe PMAP command shows the amount of memory used by one or more processes, and you can use this tool to determine which process on the server is consuming too much memory to cause a me
Check 12 Performance Tuning commands in linuxGuidePerformance Tuning is one of the most important tasks for O M engineers. If your production environment experiences slow system response speed, abnormal hard disk I/O throughput, and the data processing speed is lower than the expected value, or if the CPU, memory, hard disk, network, and other system resources are exhausted for a long time, this article wi
engineers generally do not remotely manage computers, need to provide information such as log the larger the disk space, the slower the reading speed, You can consider using multiple hard disks to make up a larger space partition just on the hard disk to do the identification, rather than the format in the file system features, so speed faster hard disk faster than the outside speed [partition number is smaller, the outer region, so the volume of data large first partition]. Program developers
If your Linux server suddenly has a sudden increase in load, warning text messages quickly explode your phone, how to find out the Linux performance problem in the shortest time? Look at the Netflix performance Engineering team's blog post to diagnose machine performance iss
cache, and the number of memory used for the file system page cache.8.sar-n DEV 1The SAR command can see the throughput of network devices here. When troubleshooting performance issues, you can determine whether the network device is saturated through the throughput of the network device.9,sar-n tcp,etcp 1The SAR command is used here to view the status of the TCP connection, which includes:ACTIVE/S: The number of locally initiated TCP connections per
represents the network card, and RXPCK/S indicates that each second receivesNumber of packets, TXPCK/S indicates the number of packets sent per second rxkb/s represents the number of bytes received per second, txkb/s represents the number of bytes sent per second, rxcmp/s represents the number of compressed packets received per second, and TXCMP/S indicates that every secondThe number of compressed packets sent. RXMCST/S represents the number of broadcast packets received per second, and averag
If your Linux server suddenly has a sudden increase in load, warning text messages quickly explode your phone, how to find out the Linux performance problem in the shortest time? Look at the Netflix performance Engineering team's blog post to diagnose machine performance iss
using the Tcpdump command in Linux. 5.netstat-Network Status statisticsNetstat is a command- line tool for monitoring packet and network interface statistics for incoming and outgoing networks. It is a very useful tool that system administrators can use to monitor network performance, locate and troubleshoot network-related issues. # Netsta
First step: View server resourcesCat/proc/cpuinfo has several CPUs that are several logical CPUs (but not actual CPUs, physical CPUs)Number of physical CPUs queried: Cat/proc/cpuinfo | grep physical (there are several in Physical-id)Number of query logical CPUs: Cat/proc/cpuinfo (there are several cores in the actual 1 CPUs)Query Memory: Free Total joinsStep Two: Deploy the environment, modify the configuration fileVI filename: Q exitStep three: Monitoring
Tags: SSI load START process Many CTR NEC idle SAR Linux Systems"Top"command to dynamically view the current system's resource situation and the list of commands that occupy the resourceUsage:-CTRL + C/Q: Stop this command to run-C: Show the complete command-"TOP-BN1": Can not dynamically show the current system's resource situation-"uptime": the first line of load average can be seen by this command$ uptim
: Priority of the processRES: The total amount of physical memory the process occupies, in kilobytes.SHR (SHARE): The amount of shared memory that the process uses. Unit is KBS (STAT): The state of the threadS: Represents the dormant state;D: Represents the non-interruptible sleep state;R: Represents the running state;Z: Represents the zombie state;T: Represents the Stop or trace status.%CPU: The percentage of CPU time and total time that the process has occupied since the most recent refresh%ME
First, let's take a look at the more than 10 monitoring Commands We're talking about: 1.dstat--Multi-type resource statistic tool the command consolidates the Vmstat,iostat and Ifstat three kinds of commands. It also adds new features and features that allow you to see all of your resource usage in a timely manner, allowing you to compare and integrate differe
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. Linux one of the command-line tools that provides an actual memory size that is already used and shared in the system, attempting to provide a more reliable current Memory use the data. 1. $ smem–m2. $ smem–m–p | grep Firefox3. $ smem–u–p4. $ smem–w–pthe above-mentioned various monitoring test commands are all their own responsibility, non-interference. The ope
IntroductionLinux is increasingly being used as a server's operating system for its stability (of course, one would say: Linux is just the OS kernel:). But if we use Linux as the underlying operating system, will we be able to ensure that our services are stable over a 24x7 manner? Not also, to know that business functions are implemented by the program running on the system, to achieve the stability of bus
addition, the most important thing is the running status of the testing machine, including CPU and mem. Whether to meet the requirements of the current performance testing type, such as performance testing, stress testing, and load testing. In addition to LoadRunner and other monitoring tools, you can also use auxiliary tools to monitor some scheduled services,
Collectl-linux Performance Monitoring Tool Http://collectl.sourceforge.net/index.html Iotop-linux Disk IO Performance monitoring tool http://guichaz.free.fr/iotop/ Linux
, please carefully check the previous introduction of those configuration, as well as firewall policy, perhaps you do not open udp161 port.650) this.width=650; "src=" http://img.blog.csdn.net/20150728144428887 "alt=" here write a picture describing "title=" "style=" border:none; "/ >Then click "Add Monitoring Project", you can select the monitoring project for this server, for
the remaining memory usage. 3. Check the number of traffic consumed by the application from start to current time 4. Test Data is written into the CSV file and stored on the mobile phone. 5. You can enable the floating window function to display the performance data of the tested application in real time. 6. You can quickly start or close the Wi-Fi network of your mobile phone in the floating window. 002. png The functions of the two tools are sim
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