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Limit the memory and cpu available for a user in Linux

I am a little concerned with the amount of resources that I can use in a shared machine. Is there any way to test if the administrator has a limit in the amount of resources that I can use? And if does, to make a more complete question, how can I set up such limit?

Thank you.

iOS - Get CPU usage from application

Does anyone know how to obtain CPU usage for an application? It's definitely possible, because there are application in app store (Activity Monitor Touch) which can show it.

Why the cpu performance counter kept reporting 0% cpu usage?

Here is my code snippet:

        PerformanceCounter cpuload = new PerformanceCounter();
        cpuload.CategoryName = "Processor";
        cpuload.CounterName = "% Processor Time";
        cpuload.InstanceName = "_Total";
        Console.WriteLine(cpuload.NextValue() + "%");

But the output is always 0%, while the cpuload.RawValue is like 736861484375 or so, what happened the NextValue()? My cpu is obviously in 0% usage.

Thanks guys~ 8^)

How can I get the CPU usage and memory usage of a single process on Linux (Ubuntu)?

I want to get the CPU and memory usage of a single process on Linux - I know the PID. Hopefully, I can get it every second and write it to a CSV using the 'watch' command. What command can I use to get this info from the Linux command-line?

How is CPU usage calculated?

On my desktop, I have a little widget that tells me my current CPU usage. It also shows the usage for each of my two cores.

I always wondered, how does the CPU calculate how much of its processing power is being used? Also, if the CPU is hung up doing some intense calculations, how can it (or whatever handles this activity) examine the usage, without getting hung up as well?

What is the correct Performance Counter to get CPU and Memory Usage of a Process?

How can I get the CPU and Memory usage of a particular process using .net Performance Counter class? And also what is the difference between

Processor\% Processor Time and Process\% Processor Time?

I am a bit confused between these two.

VS2013 permanent CPU usage even though in idle mode

I've recently updated VS2013 to Update 1 and since then VS takes CPU usage to 25% (on a 4 cores intel i5 cpu) permanently even though it's supposed to be idle. I thought it has some unfinished background processes so I left it running for a while but it keeps using the cpu when it's supposed to be idle.

Are you getting a similar behaviour after updating?

Edit 1: I'm using git and python tools for vs, so there might be some conflicts after Update 1.

Edit 2: The git integration in VS2013 is buggy. I ran a profiler on devenv.exe and git2-msvstfs.dll takes most of cpu usage although it should be idle. I sent a failure notice to MS. If you have the same problem please vote for this: http://connect.microsoft.com/VisualStudio/feedback/details/844616/vs2013-update-1-cpu-usage-not-normal

Edit 3: Update 2 has been recently released. This bug was fixed in VS2013 Update 2.

Edit 4: Updates 3 & 4 were released and CPU usage goes crazy due to multiple causes (not only git dll module). Disabling Browser Link as in one of the below answers seems to fix the problem.

How to find out the % CPU usage for Node.js process?

is there a way to find out the % cpu usage for a node.js process with the code? so that when the node.js server is running and detect the CPU is over certain%, then it will put an alert or console output.

How to get the CPU Usage in C#? [closed]

I want to get the overall total CPU usage for an application in C#. I've found many ways to dig into the properties of processes, but I only want the CPU usage of the processes, and the total CPU like you get in the TaskManager.

How do I do that?

Write code to make CPU usage display a sine wave

Write code in your favorite language and let Windows Task Manager represent a sine wave in CPU Usage History.

This is a technical interview quiz from Microsoft China. I think it's a good question. Especially it's worth knowing how candidate understand and figure out the solution.

Edit: It's a good point if may involve multi-core(cpu) cases.

MySQL high CPU usage [closed]

Recently my server CPU has been going very high.

CPU load averages 13.91 (1 min) 11.72 (5 mins) 8.01 (15 mins) and my site has only had a slight increase in traffic.

After running a top command, I saw MySQL was using 160% CPU!

Recently I've been optimizing tables and I've switched to persistent connections. Could this be causing MySQL to use high amounts of CPU?

Infinite 100% CPU usage at java.io.FileInputStream.readBytes(Native Method)

I'm right now debugging a program which has two threads per one external process, and those two threads keep on reading Process.getErrorStream() and Process.getInputStream() using a while ((i = in.read(buf, 0, buf.length)) >= 0) loop.

Sometimes when the external process crashes due to a JVM crash (see these hs_err_pid.log files), those threads which read the stdout/stderr of that external process begin consuming 100% CPU and never exit. The loop body is not being executed (I've added a logging statement there), so the infinite loop appears to be inside the native method java.io.FileInputStream.readBytes.

I've reproduced this on both Windows 7 64-bit (jdk1.6.0_30 64-bit, jdk1.7.0_03 64-bit), and Linux 2.6.18 (jdk1.6.0_21 32-bit). The code in question is here and it is used like this. See those links for the full code - here are the interesting bits:

private final byte[]              buf = new byte[256];
private final InputStream         in;
...    

int i;
while ((i = this.in.read(this.buf, 0, this.buf.length)) >= 0) {
    ...
}

The stack traces look like

"PIT Stream Monitor" daemon prio=6 tid=0x0000000008869800 nid=0x1f70 runnable [0x000000000d7ff000]
   java.lang.Thread.State: RUNNABLE
    at java.io.FileInputStream.readBytes(Native Method)
    at java.io.FileInputStream.read(FileInputStream.java:220)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
    at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
    - locked <0x00000007c89d6d90> (a java.io.BufferedInputStream)
    at org.pitest.util.StreamMonitor.readFromStream(StreamMonitor.java:38)
    at org.pitest.util.StreamMonitor.process(StreamMonitor.java:32)
    at org.pitest.util.AbstractMonitor.run(AbstractMonitor.java:19)
   Locked ownable synchronizers:
    - None

or

"PIT Stream Monitor" daemon prio=6 tid=0x0000000008873000 nid=0x1cb8 runnable [0x000000000e3ff000]
   java.lang.Thread.State: RUNNABLE
    at java.io.FileInputStream.readBytes(Native Method)
    at java.io.FileInputStream.read(FileInputStream.java:220)
    at org.pitest.util.StreamMonitor.readFromStream(StreamMonitor.java:38)
    at org.pitest.util.StreamMonitor.process(StreamMonitor.java:32)
    at org.pitest.util.AbstractMonitor.run(AbstractMonitor.java:19)
   Locked ownable synchronizers:
    - None

With the Sysinternals Process Explorer I was able to get native stack traces of those threads. Most often, over 80% of the time, the stack trace looks like this:

ntdll.dll!NtReadFile+0xa
KERNELBASE.dll!ReadFile+0x7a
kernel32.dll!ReadFile+0x59
java.dll!handleRead+0x2c
java.dll!VerifyClassCodesForMajorVersion+0x1d1
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

This also happens quite often:

ntdll.dll!RtlNtStatusToDosErrorNoTeb+0x52
ntdll.dll!RtlNtStatusToDosError+0x23
KERNELBASE.dll!GetCurrentThreadId+0x2c
KERNELBASE.dll!CreatePipe+0x21a
kernel32.dll!ReadFile+0x59
java.dll!handleRead+0x2c
java.dll!VerifyClassCodesForMajorVersion+0x1d1
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

ntdll.dll!RtlNtStatusToDosErrorNoTeb+0x42
ntdll.dll!RtlNtStatusToDosError+0x23
KERNELBASE.dll!GetCurrentThreadId+0x2c
KERNELBASE.dll!CreatePipe+0x21a
kernel32.dll!ReadFile+0x59
java.dll!handleRead+0x2c
java.dll!VerifyClassCodesForMajorVersion+0x1d1
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

And sometimes it's executing this part of the code:

java.dll!VerifyClassCodesForMajorVersion+0xc3
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

java.dll!Java_sun_io_Win32ErrorMode_setErrorMode+0x847c
java.dll!VerifyClassCodesForMajorVersion+0xd7
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

jvm.dll!JNI_GetCreatedJavaVMs+0x1829f
java.dll!VerifyClassCodesForMajorVersion+0x128
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

jvm.dll+0x88c1
jvm.dll!JNI_GetCreatedJavaVMs+0x182a7
java.dll!VerifyClassCodesForMajorVersion+0x128
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

java.dll!VerifyClassCodesForMajorVersion+0x10b
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

jvm.dll!JNI_CreateJavaVM+0x1423
java.dll!VerifyClassCodesForMajorVersion+0x190
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

jvm.dll+0x88bf
jvm.dll!JNI_CreateJavaVM+0x147d
java.dll!VerifyClassCodesForMajorVersion+0x190
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

java.dll!VerifyClassCodesForMajorVersion+0x1aa
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

java.dll!VerifyClassCodesForMajorVersion+0x1c3
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

java.dll!VerifyClassCodesForMajorVersion+0x224
java.dll!Java_java_io_FileInputStream_readBytes+0x1d

Any ideas how to solve this problem? Is this a known problem with the JVM? Is there a workaround?

How to get CPU usage and RAM usage without exec?

How does VBulletin get the system information without the use of exec? Is there any other information I can get about the server without exec? I am interested in:

• bandwidth used
• system type
• CPU speed/usage/count
• RAM usage

Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?

I have created a simple program in java:

public static void main(String[] args) throws InterruptedException {
    while (true) 
        ;
}

If I run this on a Linux machine, it shows 100% CPU usage, but doesn't cause the OS to appear slow. However, if I run the exact same code on Windows, it only shows about 20% CPU usage.

I am using Oracle JRE on Windows and OpenJDK 6 on Linux.

I'm wondering if Windows' scheduler preempt threads randomly and Linux's doesn't?

How to read the Stock CPU Usage data

On Ice Cream Sandwich, an option in the Developer Options is "Show CPU Usage", which adds an overlay on the screen (see screenshot below).

My question is, how do I read the data ? I guessed that the package names are the process currently actives, but what does the red and green bars behind mean ? Also what are the 3 numbers on top of the packages ?