Provided by: nghttp2-client_1.30.0-1ubuntu1_amd64 
NAME
h2load - HTTP/2 benchmarking tool
SYNOPSIS
h2load [OPTIONS]... [URI]...
DESCRIPTION
benchmarking tool for HTTP/2 server
<URI> Specify URI to access. Multiple URIs can be specified. URIs are used in this order for each
client. All URIs are used, then first URI is used and then 2nd URI, and so on. The scheme,
host and port in the subsequent URIs, if present, are ignored. Those in the first URI are
used solely. Definition of a base URI overrides all scheme, host or port values.
OPTIONS
-n, --requests=<N>
Number of requests across all clients. If it is used with --timing-script-file option, this
option specifies the number of requests each client performs rather than the number of requests
across all clients. This option is ignored if timing-based benchmarking is enabled (see
--duration option).
Default: 1
-c, --clients=<N>
Number of concurrent clients. With -r option, this specifies the maximum number of
connections to be made.
Default: 1
-t, --threads=<N>
Number of native threads.
Default: 1
-i, --input-file=<PATH>
Path of a file with multiple URIs are separated by EOLs. This option will disable URIs getting
from command-line. If '-' is given as <PATH>, URIs will be read from stdin. URIs are used in
this order for each client. All URIs are used, then first URI is used and then 2nd URI, and so
on. The scheme, host and port in the subsequent URIs, if present, are ignored. Those in
the first URI are used solely. Definition of a base URI overrides all scheme, host or port
values.
-m, --max-concurrent-streams=<N>
Max concurrent streams to issue per session. When http/1.1 is used, this specifies the
number of HTTP pipelining requests in-flight.
Default: 1
-w, --window-bits=<N>
Sets the stream level initial window size to (2**<N>)-1.
Default: 30
-W, --connection-window-bits=<N>
Sets the connection level initial window size to (2**<N>)-1.
Default: 30
-H, --header=<HEADER>
Add/Override a header to the requests.
--ciphers=<SUITE>
Set allowed cipher list. The format of the string is described in OpenSSL ciphers(1).
Default:
ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
-p, --no-tls-proto=<PROTOID>
Specify ALPN identifier of the protocol to be used when accessing http URI without SSL/TLS.
Available protocols: h2c and http/1.1
Default: h2c
-d, --data=<PATH>
Post FILE to server. The request method is changed to POST. For http/1.1 connection, if -d
is used, the maximum number of in-flight pipelined requests is set to 1.
-r, --rate=<N>
Specifies the fixed rate at which connections are created. The rate must be a
positive integer, representing the number of connections to be made per rate period. The
maximum number of connections to be made is given in -c option. This rate will be
distributed among threads as evenly as possible. For example, with -t2 and -r4, each
thread gets 2 connections per period. When the rate is 0, the program will run as it
normally does, creating connections at whatever variable rate it wants. The default value for
this option is 0.
--rate-period=<DURATION>
Specifies the time period between creating connections. The period must be a positive number,
representing the length of the period in time. This option is ignored if the rate option is not
used. The default value for this option is 1s.
-D, --duration=<N>
Specifies the main duration for the measurements in case of timing-based benchmarking.
--warm-up-time=<DURATION>
Specifies the time period before starting the actual measurements, in case of timing-based
benchmarking. Needs to provided along with -D option.
-T, --connection-active-timeout=<DURATION>
Specifies the maximum time that h2load is willing to keep a connection open, regardless of
the activity on said connection. <DURATION> must be a positive integer, specifying the amount of
time to wait. When no timeout value is set (either active or inactive), h2load will keep a
connection open indefinitely, waiting for a response.
-N, --connection-inactivity-timeout=<DURATION>
Specifies the amount of time that h2load is willing to wait to see activity on a given
connection. <DURATION> must be a positive integer, specifying the amount of time to wait.
When no timeout value is set (either active or inactive), h2load will keep a connection open
indefinitely, waiting for a response.
--timing-script-file=<PATH>
Path of a file containing one or more lines separated by EOLs. Each script line is composed of
two tab-separated fields. The first field represents the time offset from the start of execution,
expressed as a positive value of milliseconds with microsecond resolution. The second field
represents the URI. This option will disable URIs getting from command-line. If '-' is given
as <PATH>, script lines will be read from stdin. Script lines are used in order for each client.
If -n is given, it must be less than or equal to the number of script lines, larger values are
clamped to the number of script lines. If -n is not given, the number of requests will default
to the number of script lines. The scheme, host and port defined in the first URI are used
solely. Values contained in other URIs, if present, are ignored. Definition of a base
URI overrides all scheme, host or port values.
-B, --base-uri=(<URI>|unix:<PATH>)
Specify URI from which the scheme, host and port will be used for all requests. The base URI
overrides all values defined either at the command line or inside input files. If argument
starts with "unix:", then the rest of the argument will be treated as UNIX domain socket
path. The connection is made through that path instead of TCP. In this case, scheme is
inferred from the first URI appeared in the command line or inside input files as usual.
--npn-list=<LIST>
Comma delimited list of ALPN protocol identifier sorted in the order of preference. That means
most desirable protocol comes first. This is used in both ALPN and NPN. The parameter must
be delimited by a single comma only and any white spaces are treated as a part of protocol
string.
Default: h2,h2-16,h2-14,http/1.1
--h1 Short hand for --npn-list=http/1.1 --no-tls-proto=http/1.1, which
effectively force http/1.1 for both http and https URI.
--header-table-size=<SIZE>
Specify decoder header table size.
Default: 4K
--encoder-header-table-size=<SIZE>
Specify encoder header table size. The decoder (server) specifies the maximum dynamic table
size it accepts. Then the negotiated dynamic table size is the minimum of this option value and
the value which server specified.
Default: 4K
-v, --verbose
Output debug information.
--version
Display version information and exit.
-h, --help
Display this help and exit.
The <SIZE> argument is an integer and an optional unit (e.g., 10K is 10 * 1024). Units are K, M and G
(powers of 1024).
The <DURATION> argument is an integer and an optional unit (e.g., 1s is 1 second and 500ms is 500
milliseconds). Units are h, m, s or ms (hours, minutes, seconds and milliseconds, respectively). If a
unit is omitted, a second is used as unit.
OUTPUT
requests
total The number of requests h2load was instructed to make.
started
The number of requests h2load has started.
done The number of requests completed.
succeeded
The number of requests completed successfully. Only HTTP status code 2xx or3xx are
considered as success.
failed The number of requests failed, including HTTP level failures (non-successful HTTP status
code).
errored
The number of requests failed, except for HTTP level failures. This is the subset of the
number reported in failed and most likely the network level failures or stream was reset by
RST_STREAM.
timeout
The number of requests whose connection timed out before they were completed. This is
the subset of the number reported in errored.
status codes
The number of status code h2load received.
traffic
total The number of bytes received from the server "on the wire". If requests were made via TLS,
this value is the number of decrypted bytes.
headers
The number of response header bytes from the server without decompression. The
space savings shows efficiency of header compression. Let decompressed(headers) to the
number of bytes used for header fields after decompression. The space savings is
calculated by (1 - headers / decompressed(headers)) * 100. For HTTP/1.1, this is usually
0.00%, since it does not have header compression. For HTTP/2, it shows some insightful
numbers.
data The number of response body bytes received from the server.
time for request
min The minimum time taken for request and response.
max The maximum time taken for request and response.
mean The mean time taken for request and response.
sd The standard deviation of the time taken for request and response.
+/- sd The fraction of the number of requests within standard deviation range (mean +/- sd)
against total number of successful requests.
time for connect
min The minimum time taken to connect to a server.
max The maximum time taken to connect to a server.
mean The mean time taken to connect to a server.
sd The standard deviation of the time taken to connect to a server.
+/- sd The fraction of the number of connections within standard deviation range (mean
+/- sd) against total number of successful connections.
time for 1st byte (of (decrypted in case of TLS) application data)
min The minimum time taken to get 1st byte from a server.
max The maximum time taken to get 1st byte from a server.
mean The mean time taken to get 1st byte from a server.
sd The standard deviation of the time taken to get 1st byte from a server.
+/- sd The fraction of the number of connections within standard deviation range (mean +/- sd)
against total number of successful connections.
req/s
min The minimum request per second among all clients.
max The maximum request per second among all clients.
mean The mean request per second among all clients.
sd The standard deviation of request per second among all clients. server.
+/- sd The fraction of the number of connections within standard deviation range (mean +/- sd)
against total number of successful connections.
FLOW CONTROL
h2load sets large flow control window by default, and effectively disables flow control to avoid under
utilization of server performance. To set smaller flow control window, use -w and -W options. For
example, use -w16 -W16 to set default window size described in HTTP/2 protocol specification.
SEE ALSO
nghttp(1), nghttpd(1), nghttpx(1)
AUTHOR
Tatsuhiro Tsujikawa
COPYRIGHT
2012, 2015, 2016, Tatsuhiro Tsujikawa