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The Basics of Monitoring a UNIX System
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A slow system could be the result of a bottleneck in processing (CPU), memory, disk, or bandwidth. System monitoring tools help you to clearly identify the bottlenecks causing poor performance. Let s briefly examine what s involved in the monitoring of each of these resources on your system.
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As long as you are not utilizing 100 percent of the CPU capacity, you still have juice left in the system to support more activity. Spikes in CPU usage are common, but your goal is to track down what, if any, processes are contributing excessively to CPU usage. These are some of the key factors to remember while examining CPU usage: User versus system usage: You can identify the percentage of time the CPU power is being used for users applications as compared with time spent servicing the operating system s overhead. Obviously, if the system overhead accounts for an overwhelming proportion of CPU usage, you may have to examine this in more detail. Runnable processes: At any given time, a process is either running or waiting for resources to be freed up. A process that is waiting for the allocation of resources is called a runnable process. The presence of a large number of runnable processes indicates that your system may be facing a power crunch it is CPU-bound. Context switches and interrupts: When the operating system switches between processes, it incurs some overhead due to the so-called context switches. If you have too many context switches, you ll see deterioration in CPU usage. You ll incur similar overhead when you have too many interrupts, caused by the operating system when it finishes certain hardware- or software-related tasks.
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CH APT ER 3 ES SEN TI AL UN IX (A ND LINU X) F O R TH E O RA CLE D BA
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Memory is one of the first places you should look when you have performance problems. If you have inadequate memory (RAM), your system may slow down due to excessive swapping. Here are some of the main factors to focus on when you are checking system memory usage: Page ins and page outs: If you have a high number of page ins and page outs in your memory statistics, it means that your system is doing an excessive amount of paging, the moving of pages from memory to the disk system due to inadequate available memory. Excessive paging could lead to a condition called thrashing, which just means you are using critical system resources to move pages back and forth between memory and disk. Swap ins and swap outs: The swapping statistics also indicate how adequate your current memory allocation is for your system. Active and inactive pages: If you have too few inactive memory pages, it may mean that your physical memory is inadequate.
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When it comes to monitoring disks, you should look for two things. First, check to make sure you aren t running out of room applications add more data on a continuous basis, and it is inevitable that you will have to constantly add more storage space. Second, watch your disk performance are there any bottlenecks due to slow disk input/output performance Here are the basic things to look for: Check for free space: Using simple commands, a system administrator or a DBA can check the amount of free space left on the system. It s good, of course, to do this on a regular basis so you can head off a resource crunch before it s too late. Later in this chapter, I ll show you how to use the df and the du commands to check the free space on your system. Reads and writes: The read/write figures give you a good picture of how hot your disks are running. You can tell whether your system is handling its workload well, or if it s experiencing an extraordinary I/O load at any given time.
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