Bootchart - Boot Process Performance Visualization
Bootchart is a tool for performance analysis and visualization of the GNU/Linux boot process. Resource utilization and process information are collected during the boot process and are later rendered in a PNG, SVG or EPS encoded chart.
Hi there,
I have a script running on some DNS servers to calculate TPS, Success Rate and other Performance Counters.
My challenge is to get a Linux Data Visualization Software to collect these performance logs and produce a visualization that will be appealing to Business peeps. A sample of... (2 Replies)
Hello,
Sometime i see that the boot process hangs.
I am using rhel 6.2.
At that time in the console i see
Probing EDD (edd=off to disable)...
SSH service seems to be started but i can't login...
ssh logs (last lines) in verbose mode level 3:
debug2: we did not send a packet,... (3 Replies)
Hi,
i want to track a process using its PID in SOLARIS.
i have a code in C++ , which memory is increasing steeply increasing every 20 days, from the code i couldn't see any memory leak.
is there any way in UNIX where with the help of PID i can trace the Process usage evry hour.
... (3 Replies)
Hi
Please can someone explain to me how they would go about monitoring the performance of a process in Unix. Lets say that a user is running a process in Unix but it seems to be taking a long time, whereas it completed a lot quicker yesterday. How would you go about investigating what is causing... (1 Reply)
I have COMPAQ DS 20 SERVER, During The Boot Process, There is an ERROR MESSAGE :
malloc_mem_alloc : no space in map.
AND the system can't boot , And i can't do anything.
The server display : malloc_mem_alloc and the unique thing i can di is to restart the server with i/o buttom.
HELP ME... (1 Reply)
SYSTEMD-READAHEAD-REPLAY.SERVICE(8) systemd-readahead-replay.service SYSTEMD-READAHEAD-REPLAY.SERVICE(8)NAME
systemd-readahead-replay.service, systemd-readahead-collect.service, systemd-readahead-done.service, systemd-readahead-done.timer, systemd-
readahead - Disk read ahead logic
SYNOPSIS
systemd-readahead-replay.service
systemd-readahead-collect.service
systemd-readahead-done.service
systemd-readahead-done.timer
/usr/lib/systemd/systemd-readahead/systemd-readahead [OPTIONS...] COMMAND [DIRECTORY | FILE]
DESCRIPTION
systemd-readahead-collect.service is a service that collects disk usage patterns at boot time. systemd-readahead-replay.service is a
service that replays this access data collected at the subsequent boot. Since disks tend to be magnitudes slower than RAM, this is intended
to improve boot speeds by pre-loading early at boot all data on disk that is known to be read for the complete boot process.
systemd-readahead-done.service is executed a short while after boot completed and signals systemd-readahead-collect.service to end data
collection. On this signal, this service will then sort the collected disk accesses and store information about them in /.readahead.
Normally, both systemd-readahead-collect.service and systemd-readahead-replay.service are activated at boot so that access patterns from
the preceding boot are replayed and new data collected for the subsequent boot. However, on read-only media where the collected data cannot
be stored, it might be a good idea to disable systemd-readahead-collect.service.
On rotating media, when replaying disk accesses at early boot, systemd-readahead-replay.service will order read requests by their location
on disk. On non-rotating media, they will be ordered by their original access timestamp. If the file system supports it,
systemd-readahead-collect.service will also defragment and rearrange files on disk to optimize subsequent boot times.
OPTIONS
systemd-readahead understands the following options:
-h, --help
Prints a short help text and exits.
--max-files=
Maximum number of files to read ahead. Only valid for thes collect command.
--file-size-max=
Maximum size of files in bytes to read ahead. Only valid for the collect and replay commands.
--timeout=
Maximum time in microseconds to spend collecting data. Only valid for the collect command.
COMMANDS
The following commands are understood by systemd-readahead:
collect [DIRECTORY]
Collect read-ahead data on early boot. When terminating, it will write out a pack file to the indicated directory containing the
read-ahead data.
replay [DIRECTORY]
Perform read-ahead on the specified directory tree.
analyze [FILE]
Dumps the content of the read-ahead pack file to the terminal. For each file, the output lists approximately how much will be read
ahead by the replay command.
SEE ALSO systemd(1)systemd 208SYSTEMD-READAHEAD-REPLAY.SERVICE(8)