However, we’re interested in the number 19, which will print the RAM devices that are currently attached to the slots on our motherboard: # dmidecode -type 19 # dmidecode 3.3Īs we can see, we only have a single RAM device with 8 GB of total size installed in one of the RAM slots. In our case, we want to look at the memory DMI type, which can be accessed with the assigned numbers 5, 6, 16, 17, 18, 19, 20, 21, and 22. The –type option expects a number for DMI types. It contains a lot of information related to our hardware components, but we’re only interested in our total memory size.įortunately, we can feed the –type option to the command for different components such as BIOS, memory, processor, temperatures, and so on. We need to have root privileges to run dmidecode. Once we run the command, we’ll be able to see detailed hardware information. Once the installation is complete, we can run the dmidecode command from our terminal: # dmidecode Sometimes, we don’t need all the info, so we can use grepto extract only the desired entry: $ vmstat -s | grep -i 'total memory' | sed 's/ *//' 8021048 K total memory The first entry in the output is total physical RAM. Since we’re interested in total RAM size, we’re going to add the -s or –stats flag: $ vmstat -s 8021048 K total memory ![]() The -w or –wide flag prints the output in a wide readable format. By default, when we type the vmstat command, it will print the free, buffered, and cached memory alongside swap, CPU, IO, and system information: $ vmstat -w -procs-memory-swap-io-system-cpu. Like the free command, vmstat (virtual memory statistics) is also available on most Linux distributions. We can easily terminate the process with Ctrl + C keyboard shortcut. It’s especially useful if we want to monitor the RAM usage at a specified interval. The -s flag stands for seconds, so free will print the RAM usage every 5 seconds in this example. One more interesting option is the -s option: $ free -h -s 5 Moreover, there are lots of other options that can be used to print the output in the format we like such as –kilo, –mega, –Giga, and so on. However, we can easily print the output in a human-readable format using the -h or –human flag: $ free -h total used free shared buff/cache availableĪs can be seen in the output above, we have a total of 7.6 GiB of RAM. We can simply type the free command on our terminal without any flags: $ free total used free shared buff/cache available The free command is one of the widely used commands to quickly check for RAM stats because it’s available on most Linux distributions. It’s used to print the physical and swap memory usage - by default, it prints to standard output. 0.Free is the simplest of all the commands we’ll see. The minor collection took about a quarter of a second. Generation, which is the total heap minus one of the survivor spaces. Is the total available space, not counting the space in the permanent The number in parenthesis (776768K) (in the first line) Objects that aren't necessarily alive but can't be reclaimed, eitherīecause they are directly alive, or because they are within or After minor collections the count includes Indicate the combined size of live objects before and after garbageĬollection, respectively. The numbersīefore and after the arrow 325407K->83000K (in the first line) Here we see two minor collections and one major one. To change between releases of the J2SE platform. Note that the format of the -verbose:gc output is subject The command line argument -verbose:gc prints information at everyĬollection. You simply add -verbose:gc to the startup command. If you are using the Sun JVM, and are interested in the internal memory usage of the application (how much out of the allocated memory your app is using) I prefer to turn on the JVMs built-in garbage collection logging. ![]() * For each filesystem root, print some info */ * Get a list of all filesystem roots on this system */ Sb.append(runtime.availableProcessors()) Sb.append("Available processors (cores): ") Sb.append(format.format((freeMemory + (maxMemory - allocatedMemory)) / 1024)) Sb.append(format.format(maxMemory / 1024)) Sb.append(format.format(allocatedMemory / 1024)) Sb.append(format.format(freeMemory / 1024)) Long allocatedMemory = runtime.totalMemory() NumberFormat format = NumberFormat.getInstance() Return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory() Return Runtime.getRuntime().totalMemory() Additionally, you can find the Task Manager via the Start Menu or the Taskbar: Right-click the. Private Runtime runtime = Runtime.getRuntime() Ctrl + Shift + Escape Ctrl + Alt + Delete, and then click Task Manager from the options presented.
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