NAME

       varnishhist - Varnish request histogram

SYNOPSIS

       varnishhist  [-B  <factor>]  [-C] [-d] [-g <request|vxid>] [-h] [-L <limit>] [-n <dir>] [-p <period>] [-P
       responsetime]  [-P  size]  [-P  Bereqtime]  [-P  Beresptime]  [-P   BerespBodytime]   [-P   Besize]   [-P
       <[cb:]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:

       -B <factor>
              Factor to bend time by. Particularly useful when [-r]eading from a vsl file. =1  process  in  near
              real  time,  <1  slow-motion,  >1  time-lapse  (useless unless reading from a file). At runtime, <
              halves and > doubles.

       -C     Do all regular expression and string matching caseless.

       -d     Process log records at the head of the log and exit.

       -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 <dir>
              Specify  the  varnishd  working directory (also known as instance name) to get logs from. If -n is
              not specified, the host name is used.

       -p <period>
              Specified the number of seconds between screen refreshes. Default is 1 second, and can be  changed
              at runtime by pressing the [0-9] keys (powers of 2 in seconds or + and - (double/halve the speed).

       -P responsetime
              Predefined  client  profile:  graph  the  total  time from start of request processing (first byte
              received) until ready to deliver the client response (field 3 of SLT_Timestamp Process: VSL tag).

       -P size
              Predefined client profile: graph the size of responses (field 5 of SLT_ReqAcct  VSL tag).

       -P Bereqtime
              Predefined backend profile: graph the time from beginning of backend processing  until  a  backend
              request is sent completely (field 3 of SLT_Timestamp Bereq: VSL tag).

       -P Beresptime
              Predefined backend profile: graph the time from beginning of backend processing until the response
              headers are being received completely (field 3 of SLT_Timestamp Beresp: VSL tag).

       -P BerespBodytime
              Predefined backend profile: graph the time from beginning of backend processing until the response
              body has been received (field 3 of SLT_Timestamp BerespBody: VSL tag).

       -P Besize
              Predefined  backend  profile:  graph the backend response body size (field 5 of SLT_BereqAcct  VSL
              tag).

       -P <[cb:]tag:field_num:min:max>
              Graph the given custom definition defined as: an optional (c)lient or (b)ackend  filter  (defaults
              to  client),  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 ten).

       -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)

       • vsl(7)

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)