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Previously h2load used default flow control window as described in HTTP/2 and SPDY specification. The window size is 64KiB, which is a bit small, and cannot utilize full server performance when response size is not too small. Basically, we do this kind of benchmarking test to measure server's throughput, and optimal performance. Smaller window certainly degrades performance even in local testing because server is so fast that it has to wait for WINDOW_UPDATE from h2load. To make default behaviour suitable for peak performance test, we decided to disable flow control in h2load by setting large enough window size. Most users used h2load without -w or -W options, so they were implicitly throttled by flow control and the result was affected by that negatively. Now flow control is disabled by default, the result may improve depending on the implementations.
65 lines
2.0 KiB
Plaintext
65 lines
2.0 KiB
Plaintext
OUTPUT
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------
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requests
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total
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The number of requests h2load was instructed to make.
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started
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The number of requests h2load has started.
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done
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The number of requests completed.
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succeeded
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The number of requests completed successfully. Only HTTP status
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code 2xx or3xx are considered as success.
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failed
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The number of requests failed, including HTTP level failures
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(non-successful HTTP status code).
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errored
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The number of requests failed, except for HTTP level failures.
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status code. This is the subset of the number reported in
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``failed`` and most likely the network level failures or stream
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was reset by RST_STREAM.
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status codes
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The number of status code h2load received.
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traffic
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total
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The number of bytes received from the server "on the wire". If
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requests were made via TLS, this value is the number of decrpyted
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bytes.
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headers
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The number of response header bytes from the server without
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decompression. For HTTP/2, this is the sum of the payload of
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HEADERS frame. For SPDY, this is the sum of the payload of
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SYN_REPLY frame.
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data
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The number of response body bytes received from the server.
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time for request
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min
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The minimum time taken for request and response.
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max
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The maximum time taken for request and response.
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mean
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The mean time taken for request and response.
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sd
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The standard deviation of the time for request and response.
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+/- sd
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The fraction of the number of requests within standard deviation
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range (mean +/- sd) against total number of successful requests.
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FLOW CONTROL
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------------
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h2load sets large flow control window by default, and effectively
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disables flow control to avoid under utilization of server
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performance. To set smaller flow control window, use :option:`-w` and
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:option:`-W` options. For example, use ``-w16 -W16`` to set default
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window size described in HTTP/2 and SPDY protocol specification.
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SEE ALSO
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--------
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:manpage:`nghttp(1)`, :manpage:`nghttpd(1)`, :manpage:`nghttpx(1)`
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