`time` is a command line utility for running another program and summarizing resource usage

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Find last shutdown time

This is the command I am using: last -x|grep shutdown | head -1 but it's giving me the duration with +2 hours: shutdown system down 3.14-1-amd64 Mon Jul 21 08:43 - 22:19 (13:36) the last ...
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247 views

What value is stored in linux xtime variable?

Whenever I print the value of /proc/interrupts the value of rtc0 in IRQ8 which is for RTC shows only 1 interrupt on CPU0. I have read that when booting the value of the xtime variable is stored from ...
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52 views

NTPD Nanokernel

I had a couple of questions about the NTP Nanokernel as explained here: http://www.eecis.udel.edu/~mills/database/brief/nano/nano.pdf The big question is how does this Nanokernel manage to deliver an ...
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25 views

Improve kernel boot time

I am using OMAPL138 and kernel version 2.6.37 and I would like to improve the boot time. By analyzing the kernel boot process I think it is taking a long time at MII PHY CONFIGURATION. The printscreen ...
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98 views

Which counter generates timer interrupts?

I did a iotop to observe the interrupts on my computer. This is the interrupt shown most often. 0 [PIC-edge time] 247 Ints/s (max: 389) I believe it's the timer interrupt, well since ...
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cpu time measurement with wait4 vs. cpuacct cgroup

I want to start a process and measure the cpu time (user+sys) it needs until it terminates. I know I can use the wait4 system call, which returns a struct with user and system time (I use the sum of ...
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Variations in Ubuntu 12.04 /usr/bin/time statistics

I have a command line tool which I run on Ubuntu 12.04.5 LTS. I need to calculate the cpu time for this program. I have been checking /usr/bin/time function. command: /usr/bin/time -v -a -o ...
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How does an X86 Linux system maintain the system time, when no NTP etc. is in play?

When an x86 Linux system is powered up and running, how does it keep track of software time? E.g. is it incrementing a software counter based on hardware interrupts from the RTC, or is there some ...
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80 views

Changing file time using touch

Im trying to change the file time of a m#merge the files to a temporary file. mergecap -w "${dir_dcn}"/merge_dcn.pcap "${FILES_dcn[@]}" touch -r "${FILES_dcn[14]}" dcn_file ls -l dcn_file ...
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timedatectl not persisting time when set manually

Configuration before any attempts to modify it as per timedatectl: Then, I set the time manually timedatectl --adjust-system-clock set-time "2010-04-20 04:30:50": Nice, works! Now, I rerun ...
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Get CPU time for Benchmark in Bash Script

I'm using this Method here: http://giantdorks.org/alain/how-to-benchmark-individual-shell-script-sections-to-identify-slow-parts/ to Benchmark my Bashscript: RuntimePrint() { duration=$(echo ...
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203 views

System CPU Time and User CPU Time Calculation for a Process in Linux

I want to calculate CPU time consumption of a particular process in system mode and user mode using statistics present in /proc/<PID>. There are two fields utime and stime in ...