NAME

       varnishhist - Varnish request histogram

SYNOPSIS

       varnishhist  [-B  <factor>] [-C] [-d] [-g <request|vxid>] [-h] [-L <limit>] [-n <dir>] [-p
       <period>] [-P responsetime] [-P reqbodytime] [-P size] [-P Bereqtime] [-P Beresptime]  [-P
       BerespBodytime]  [-P Besize] [-P <[cb:]tag:[prefix]: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 reqbodytime
              Predefined client profile: graph the time for reading the request body (field 3  of
              SLT_Timestamp ReqBody: 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:[prefix]: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, a prefix to look for  (can  be
              empty,  but must be terminated by a colon) and the field number of the value we are
              interested in. min and max are the boundaries of the graph in  powers  of  ten  and
              default to -6 and 3.

       -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.

       --optstring
              Print the optstring parameter to getopt(3) to help writing wrapper scripts.

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)