NAME

       varnishhist - Varnish request histogram

SYNOPSIS

       varnishhist  [-C]  [-d]  [-g  <request|vxid>]  [-h] [-L limit] [-n name] [-N filename] [-p
       period]  [-P  <size|responsetime|tag:field_num:min:max>]  [-q  query]  [-r  filename]  [-t
       <seconds|off>] [-T seconds] [-V]

DESCRIPTION

       The  varnishhist  utility reads varnishd(1) shared memory logs and presents a continuously
       updated histogram showing the distribution of the last N  requests  by  their  processing.
       The  value  of  N  and  the  vertical  scale  are  displayed  in the top left corner.  The
       horizontal scale is logarithmic.  Hits are marked with a pipe character ("|"), and  misses
       are marked with a hash character ("#").

       The following options are available:

       -C     Do all regular expression and string matching caseless.

       -d     Start processing log records at the head of the log instead of the tail.

       -g <request|vxid>
              The grouping of the log records. The default is to group by vxid.

       -h     Print program usage and exit

       -L limit
              Sets  the upper limit of incomplete transactions kept before the oldest transaction
              is force completed. A warning record is synthesized when this happens. This setting
              keeps  an  upper  bound  on  the  memory usage of running queries. Defaults to 1000
              transactions.

       -n name
              Specify the name of the varnishd instance to get logs from. If -n is not specified,
              the host name is used.

       -N filename
              Specify  the  filename  of  a  stale  VSM  instance.  When  using  this  option the
              abandonment checking is disabled.

       -p period
              Specified the number of seconds between screen refreshes. Default is 1 second,  and
              can be changed at runtime by pressing the [1-9] keys.

       -P <size|responsetime|tag:field_num:min:max>
              Either specify "size" or "responsetime" profile or create a new one. Define the tag
              we'll look for, and the field number of the value we are interested in. min and max
              are the boundaries of the graph (these are power of tens).

       -q query
              Specifies the VSL query to use.

       -r filename
              Read  log  in  binary  file  format  from  this  file. The file can be created with
              varnishlog -w filename.

       -t <seconds|off>
              Timeout before returning error on initial VSM connection. If set the VSM connection
              is  retried  every  0.5  seconds  for  this many seconds. If zero the connection is
              attempted only once and will fail immediately if unsuccessful. If set to "off", the
              connection  will  not fail, allowing the utility to start and wait indefinetely for
              the Varnish instance to appear.  Defaults to 5 seconds.

       -T seconds
              Sets the transaction timeout in seconds. This defines the maximum number of seconds
              elapsed  between  a  Begin  tag  and the End tag. If the timeout expires, a warning
              record is synthesized and the transaction  is  force  completed.  Defaults  to  120
              seconds.

       -V     Print version information and exit.

SEE ALSO

       • varnishd(1)

       • varnishlog(1)

       • varnishncsa(1)

       • varnishstat(1)

       • varnishtop(1)

HISTORY

       The  varnishhist  utility  was  developed by Poul-Henning Kamp in cooperation with Verdens
       Gang AS and Varnish Software AS. This manual page was written by Dag-Erling Smørgrav.

COPYRIGHT

       This document is licensed under the same  licence  as  Varnish  itself.  See  LICENCE  for
       details.

       • Copyright (c) 2006 Verdens Gang AS

       • Copyright (c) 2006-2015 Varnish Software AS

                                                                                   VARNISHHIST(1)