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Tag: linux

What does “high involuntary context” switches mean?

I have re-written a part of code in C. When testing it with logging the resource usage using getrusage(2) C API. Before changing the code: After changing: I see a lot of involuntary context switches being done in the code I have re-written. My question is not about how to reduce context switches. But.. What h…

iptables LOG and DROP in one rule

I am trying to log outgoing connections with iptables. What I want is, drop and accept connection while logging them also. I have found that -j option takes DROP/REJECT/ACCEPT/LOG. But I want to do something like DROP and LOG or ACCEPT and LOG. Is there a way to achieve this ? Answer Example: Log Exampe: Othe…

Understanding load average vs. cpu usage [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack …

Adding additional newline between each line

I am analyzing log files from my server(particular few lines from there). But those lines are having around 1000 to 2000 characters in length. Here is an example how the lines are coming out with grep and less with following command. Output: But its hard for me to separate them as those are screen full of tex…

I do not understand how execlp() works in Linux

I have spent the last 2 days trying to understand the execlp() system call, but yet here I am. Let me get straight to the issue. The man page of execlp declares the system call as int execlp(const char *file, const char *arg, …); with the description: The const char arg and subsequent ellipses in the ex…