/**
@page sockperf
   SockPerf is a tool for network performance measurement written in C++.


@section _summary 1. SUMMARY

   SockPerf is a network testing tool oriented to measure network latency and
   also spikes of network latency. Tool can create UDP/TCP data streams and
   measure the throughput and latency of a network that is carrying them.
   SockPerf allows the user to define different parameters that can be used for
   testing a network, or alternately for optimizing or tuning a network.
   Tool provides a client and server functionality, and can measure the throughput
   and latency between the two end-points, either unidirectionally or bidirectionally.
   This utility can be used in Linux systems.

@section _introduction 2. INTRODUCTION

   People are often concerned about measuring the maximum data throughput rate of
   a communications link or network access. A typical method of performing a
   measurement is to transfer a 'large' file and measure the time taken to do so.
   The throughput is then calculated by dividing the file size by the time to get
   the throughput in megabits, kilobits, or bits per second.
   Unfortunately, the results of such an exercise will result in the goodput which
   is less than the maximum throughput, leading to people believing that their communications
   link is not operating correctly. In fact, there are many overheads accounted for
   in good case in addition to transmission overheads, including latency,
   TCP Receive Window size and machine limitations, which means the calculated
   goodput does not reflect the maximum achievable throughput.

   Another important thing of tool capacity is latency measurement. Latency - is the
   time it takes packet to go from user space program on one machine to user space program
   on another machine.
   Being able to quantify latency in terms other than millisecond response time is
   important when determining the quality of a network. One of available tool that can help
   administrators do just that is Sockperf.

   SockPerf works as an on-demand client and server test. How this works is that one system runs
   the Sockperf server over a specified port and another system functions as a client running
   the Sockperf client. The binaries are the same, and there is an option to have the role
   of client or server, so the roles can easily be reversed if necessary.

@section _overview 3. OVERVIEW

   Sockperf tests UDP/TCP network connection and maintenance following functionality:
   - Measure latency;
   - Measure TX/RX bandwidth;
   - Measure packet loss;
   - Multicast;
   - Multi-threaded;

   features:
   - Measure the RTT of packets in descrete way;
   - Provide full log of packet times;
   - Provide few modes to monitor multiple file descriptors as recvfrom/select/poll/epoll;
   - Improved CPU utilization;

   Initially the tool was developed to demonstrate advantages of Mellanox's Messaging Accelerator (VMA).
   VMA is a socket API based, dynamically linked, user space Linux library which serves to
   transparently enhance the performance of Multicast/UDP/TCP networking heavy applications over
   the InfiniBand and Ethernet network.
   More interested user can read detail information at http://www.mellanox.com.
   Actually Sockperf can be used natively, or with VMA acceleration and see the benefit of VMA.

   SockPerf operates by sending packets from the client to the server, which then sends
   the packets back to the client. This measured round trip time is the route trip time (RTT)
   between the two machines on a specific network path.
   The average RTT is calculated by dividing the total number of packets that perform this
   round trip by some fixed period of time. The average latency for a given one-way path
   between the two machines is the average RTT divided by two.

   SockPerf can work as server or execute under-load, ping-pong, playback and throughput tests and
   be a server or a client.

   SockPerf can be launched in single point manner that is name as the first mode and using special
   formatted feed file named as the second mode.

   Mode One:
@code
$sockperf server -i 224.18.7.81 -p 5001
sockperf: == version #3.5-no.git ==
sockperf: [SERVER] listen on:
[ 0] IP = 224.18.7.81     PORT =  5001 # UDP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: [tid 4701] using recvfrom() to block on socket(s
@endcode

   Mode Two:
@code
$sockperf server -f conf.file -F e
sockperf: == version #3.5-no.git ==
sockperf: [SERVER] listen on:
[ 0] IP = 5.2.1.3        PORT =  6671 # TCP
[ 1] IP = 5.2.1.3        PORT =  6672 # TCP
[ 2] IP = 5.2.1.3        PORT =  6673 # TCP
[ 3] IP = 5.2.1.3        PORT =  6674 # TCP
[ 4] IP = 5.2.1.3        PORT =  6675 # TCP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: [tid 4805] using epoll() to block on socket(s)
@endcode

   Every line in feed file should have following format as
   [U|T]:address:port
   where
   - [U|T] - UDP or TCP protocol;
   - address - Internet Protocol (IP) address;
   - port - Port number;


@subsection _option 3.1 Available options

   The following table describes Sockperf options, and their possible values:
@code
 -h,-?   --help,--usage         -Show the help message and exit.
         --tcp                  -Use TCP protocol (default UDP).
 -i      --ip                   -Listen on/send to ip <ip>.
 -p      --port                 -Listen on/connect to port <port> (default 11111).
 -f      --file                 -Read list of connections from file (used in pair with -F option).
 -F      --iomux-type           -Type of multiple file descriptors handle [s|select|p|poll|e|epoll|r|recvfrom|x|socketxtreme](default epoll).
         --timeout              -Set select/poll/epoll timeout to <msec>, -1 for infinite (default is 10 msec).
 -a      --activity             -Measure activity by printing a '.' for the last <N> messages processed.
 -A      --Activity             -Measure activity by printing the duration for last <N>  messages processed.
         --tcp-avoid-nodelay    -Stop/Start delivering TCP Messages Immediately (Enable/Disable Nagel). Default is Nagel Disabled except in Throughput where the default is Nagel enabled.
         --tcp-skip-blocking-send
                                -Enables non-blocking send operation (default OFF).
         --tos                  -Allows setting tos
         --mc-rx-if             -Set address <ip> of interface on which to receive multicast messages (can be other then route table).
         --mc-tx-if             -Set address <ip> of interface on which to transmit multicast messages (can be other then route table).
         --mc-loopback-enable   -Enables mc loopback (default disabled).
         --mc-ttl               -Limit the lifetime of the message (default 2).
         --mc-source-filter     -Set address <ip, hostname> of multicast messages source which is allowed to receive from.
         --uc-reuseaddr         -Enables unicast reuse address (default disabled).
         --lls                  -Turn on LLS via socket option (value = usec to poll).
         --buffer-size          -Set total socket receive/send buffer <size> in bytes (system defined by default).
         --nonblocked           -Open non-blocked sockets.
         --recv_looping_num     -Set Sockperf to loop over recvfrom() until EAGAIN or <N> good received packets, -1 for infinite, must be used with --nonblocked (default 1).
         --dontwarmup           -Don't send warm up messages on start.
         --pre-warmup-wait      -Time to wait before sending warm up messages (seconds).
         --vmazcopyread         -Use VMA's zero copy reads API (See VMA's readme).
         --daemonize            -Run as daemon.
         --no-rdtsc             -Don't use register when taking time; instead use monotonic clock.
         --load-vma             -Load VMA dynamically even when LD_PRELOAD was not used.
         --rate-limit           -use rate limit (packet-pacing), with VMA must be run with VMA_RING_ALLOCATION_LOGIC_TX mode.
         --set-sock-accl        -Set socket acceleration before run (available for some of Mellanox systems)
 -d      --debug                -Print extra debug information.
@endcode

@subsection _server 3.2 Server

   Server options are:
@code
         --threads-num          -Run <N> threads on server side (requires '-f' option).
         --cpu-affinity         -Set threads affinity to the given core ids in list format (see: cat /proc/cpuinfo).
         --vmarxfiltercb        -Use VMA's receive path message filter callback API (See VMA's readme).
         --force-unicast-reply  -Force server to reply via unicast.
         --dont-reply           -Server won't reply to the client messages.
 -m      --msg-size             -Set maximum message size that the server can receive <size> bytes (default 65507).
 -g      --gap-detection        -Enable gap-detection.
@endcode

@subsection _client 3.3 Client

   Sockperf supports different scenarios to run itself as a client. There are under-load,
   ping-pong, playback and throughput subcommands to select one of the scenarios.

   - under-load - run sockperf client for latency under load test;
   - ping-pong - run sockperf client for latency test in ping pong mode;
   - playback - run sockperf client for latency test using playback of predefined
                traffic, based on timeline and message size;
   - throughput - run sockperf client for one way throughput test;

   General client options are:
@code
         --srv-num              -Set num of servers the client works with to N.
         --sender-affinity      -Set sender thread affinity to the given core ids in list format (see: cat /proc/cpuinfo).
         --receiver-affinity    -Set receiver thread affinity to the given core ids in list format (see: cat /proc/cpuinfo).
         --full-log             -Dump full log of all messages send/receive time to the given file in CSV format.
         --giga-size            -Print sizes in GigaByte.
         --increase_output_precision
                                -Increase number of digits after decimal point of the throughput output (from 3 to 9).
         --dummy-send           -Use VMA's dummy send API instead of busy wait, must be higher than regular msg rate.
                                 optional: set dummy-send rate per second (default 10,000), usage: --dummy-send [<rate>|max]
 -t      --time                 -Run for <sec> seconds (default 1, max = 36000000).
         --client_port          -Force the client side to bind to a specific port (default = 0).
         --client_ip            -Force the client side to bind to a specific ip address (default = 0).
 -b      --burst                -Control the client's number of a messages sent in every burst.
         --mps                  -Set number of messages-per-second (default = 10000 - for under-load mode, or max - for ping-pong and throughput modes; for maximum use --mps=max;
                                 support --pps for old compatibility).
 -m      --msg-size             -Use messages of size <size> bytes (minimum default 14).
 -r      --range                -comes with -m <size>, randomly change the messages size in range: <size> +- <N>.
         --data-integrity       -Perform data integrity test
@endcode

@subsection _tool 3.4 Tools

   SockPerf package contains few scripts that allow to generate special formatted file to launch tool in
   different configurations.
   - filter.awk - can be used for filtering lines from the full log file based on given latency range;
   - gen1.awk - this awk script generates playback files (it is for stable PPS playback file);
   - gen2.awk - this awk script generates playback files using  the input for this script is file with lines of the format:
                startTime; duration; startPPS; endPPS; msgSize (it is for linear increased and decreased PPS playback file);

@code
   create playback file using gen1.awk > pfile
   generated file:
# ==== playback file for sockperf - generated by gen1.awk ====
#baseTime=1.000000; PPS=200000; runtime=1.000000; interval=0.000005; NUM_RECORDS=200000
# file contains 200000 records
1.000005000, 12
1.000010000, 12
1.000015000, 12
1.000020000, 12
1.000025000, 12
1.000030000, 12
1.000035000, 12
1.000040000, 12
...
1.999950000, 12
1.999955000, 12
1.999960000, 12
1.999965000, 12
1.999970000, 12
1.999975000, 12
1.999980000, 12
1.999985000, 12
1.999990000, 12
1.999995000, 12
2.000000000, 12
#200000 records were written successfully
   start server on ipX
   start client using: ./sockperf ping-pong -i <ip-address> -p <port> --playback=pfile
@endcode

@subsection _usage 3.5 Usage

@subsection _usage1 3.5.1 Running Multicast over IPoIB

- Configure the routing table to map multicast addresses to the IPoIB interface on
both client and server machines, as follows:
@code
route add -net 224.0.0.0 netmask 240.0.0.0 dev ib0
@endcode
In this case, ib0 is the IPoIB interface.

- Run the server as follows:
@code
$sockperf server -i 224.18.7.81 -p 5001
sockperf: == version #3.5-no.git ==
sockperf: [SERVER] listen on:
[ 0] IP = 224.18.7.81     PORT =  5001 # UDP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: [tid 30399] using recvfrom() to block on socket(s)
@endcode

- Run the client as follows:
@code
$sockperf ping-pong -i 224.18.7.81 -p 5001 -m 16384 -t 10 --mps=max
sockperf: == version #3.5-no.git ==
sockperf[CLIENT] send on:sockperf: using recvfrom() to block on socket(s)

[ 0] IP = 224.18.7.81     PORT =  5001 # UDP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: Starting test...
sockperf: Test end (interrupted by timer)
sockperf: Test ended
sockperf: [Total Run] RunTime=10.000 sec; Warm up time=400 msec; SentMessages=240464; ReceivedMessages=240463
sockperf: ========= Printing statistics for Server No: 0
sockperf: [Valid Duration] RunTime=9.550 sec; SentMessages=229630; ReceivedMessages=229630
sockperf: ====> avg-lat= 20.771 (std-dev=5.266)
sockperf: # dropped messages = 0; # duplicated messages = 0; # out-of-order messages = 0
sockperf: Summary: Latency is 20.771 usec
sockperf: Total 229630 observations; each percentile contains 2296.30 observations
sockperf: ---> <MAX> observation =  120.108
sockperf: ---> percentile 99.999 =  106.349
sockperf: ---> percentile 99.990 =   63.772
sockperf: ---> percentile 99.900 =   55.940
sockperf: ---> percentile 99.000 =   48.619
sockperf: ---> percentile 90.000 =   24.295
sockperf: ---> percentile 75.000 =   20.358
sockperf: ---> percentile 50.000 =   19.279
sockperf: ---> percentile 25.000 =   18.641
sockperf: ---> <MIN> observation =   16.748
@endcode

@subsection _usage2 3.5.2 Running TCP over Ethernet

- Run the server as follows:
@code
$sockperf server -i 22.0.0.3 -p 5001 --tcp
sockperf: == version #3.5-no.git ==
sockperf: [SERVER] listen on:
[ 0] IP = 22.0.0.3        PORT =  5001 # TCP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: [tid 1567] using recvfrom() to block on socket(s)
@endcode

- Run the client as follows:
@code
$sockperf ping-pong -i 22.0.0.3 -p 5001 --tcp -m 64 -t 10 --mps=max
sockperf: == version #3.5-no.git ==
sockperf[CLIENT] send on:sockperf: using recvfrom() to block on socket(s)

[ 0] IP = 22.0.0.3        PORT =  5001 # TCP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: Starting test...
sockperf: Test end (interrupted by timer)
sockperf: Test ended
sockperf: [Total Run] RunTime=10.000 sec; Warm up time=400 msec; SentMessages=553625; ReceivedMessages=553624
sockperf: ========= Printing statistics for Server No: 0
sockperf: [Valid Duration] RunTime=9.550 sec; SentMessages=528579; ReceivedMessages=528579
sockperf: ====> avg-lat=  9.017 (std-dev=4.171)
sockperf: # dropped messages = 0; # duplicated messages = 0; # out-of-order messages = 0
sockperf: Summary: Latency is 9.017 usec
sockperf: Total 528579 observations; each percentile contains 5285.79 observations
sockperf: ---> <MAX> observation =   98.777
sockperf: ---> percentile 99.999 =   72.628
sockperf: ---> percentile 99.990 =   17.980
sockperf: ---> percentile 99.900 =   16.824
sockperf: ---> percentile 99.000 =   16.193
sockperf: ---> percentile 90.000 =   14.731
sockperf: ---> percentile 75.000 =   14.301
sockperf: ---> percentile 50.000 =    6.222
sockperf: ---> percentile 25.000 =    5.759
sockperf: ---> <MIN> observation =    4.629
@endcode

@subsection _usage3 3.5.3 Running UDP over Ethernet using VMA

- More interested user can read detail information about VMA at http://www.mellanox.com.
- VMA_SPEC=latency is a predefined specification profile for latency.

- Run the server as follows:
@code
$VMA_SPEC=latency LD_PRELOAD=libvma.so sockperf server -i 22.0.0.3 -p 5001
 VMA INFO: ---------------------------------------------------------------------------
 VMA INFO: VMA_VERSION: 8.6.10-0 Development Snapshot built on Jun 27 2018 16:06:47
 VMA INFO: Cmd Line: sockperf server -i 22.0.0.3 -p 5001
 VMA INFO: Current Time: Tue Sep 18 08:49:23 2018
 VMA INFO: Pid:  2201
 VMA INFO: OFED Version: MLNX_OFED_LINUX-4.4-1.0.0.0:
 VMA INFO: Architecture: x86_64
 VMA INFO: Node: r-aa-apollo03.mtr.labs.mlnx
 VMA INFO: ---------------------------------------------------------------------------
 VMA INFO: VMA Spec                       Latency                    [VMA_SPEC]
 VMA INFO: Log Level                      INFO                       [VMA_TRACELEVEL]
 VMA INFO: Ring On Device Memory TX       16384                      [VMA_RING_DEV_MEM_TX]
 VMA INFO: Tx QP WRE                      256                        [VMA_TX_WRE]
 VMA INFO: Tx QP WRE Batching             4                          [VMA_TX_WRE_BATCHING]
 VMA INFO: Rx QP WRE                      256                        [VMA_RX_WRE]
 VMA INFO: Rx QP WRE Batching             4                          [VMA_RX_WRE_BATCHING]
 VMA INFO: Rx Poll Loops                  -1                         [VMA_RX_POLL]
 VMA INFO: Rx Prefetch Bytes Before Poll  256                        [VMA_RX_PREFETCH_BYTES_BEFORE_POLL]
 VMA INFO: GRO max streams                0                          [VMA_GRO_STREAMS_MAX]
 VMA INFO: Select Poll (usec)             -1                         [VMA_SELECT_POLL]
 VMA INFO: Select Poll OS Force           Enabled                    [VMA_SELECT_POLL_OS_FORCE]
 VMA INFO: Select Poll OS Ratio           1                          [VMA_SELECT_POLL_OS_RATIO]
 VMA INFO: Select Skip OS                 1                          [VMA_SELECT_SKIP_OS]
 VMA INFO: CQ Drain Interval (msec)       100                        [VMA_PROGRESS_ENGINE_INTERVAL]
 VMA INFO: CQ Interrupts Moderation       Disabled                   [VMA_CQ_MODERATION_ENABLE]
 VMA INFO: CQ AIM Max Count               128                        [VMA_CQ_AIM_MAX_COUNT]
 VMA INFO: CQ Adaptive Moderation         Disabled                   [VMA_CQ_AIM_INTERVAL_MSEC]
 VMA INFO: CQ Keeps QP Full               Disabled                   [VMA_CQ_KEEP_QP_FULL]
 VMA INFO: TCP nodelay                    1                          [VMA_TCP_NODELAY]
 VMA INFO: Avoid sys-calls on tcp fd      Enabled                    [VMA_AVOID_SYS_CALLS_ON_TCP_FD]
 VMA INFO: Internal Thread Affinity       0                          [VMA_INTERNAL_THREAD_AFFINITY]
 VMA INFO: Thread mode                    Single                     [VMA_THREAD_MODE]
 VMA INFO: Mem Allocate type              2 (Huge Pages)             [VMA_MEM_ALLOC_TYPE]
 VMA INFO: ---------------------------------------------------------------------------
sockperf: == version #3.5-no.git ==
sockperf: [SERVER] listen on:
[ 0] IP = 22.0.0.3        PORT =  5001 # UDP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: [tid 2201] using recvfrom() to block on socket(s)
@endcode

- Run the client as follows:
@code
$VMA_SPEC=latency LD_PRELOAD=libvma.so sockperf ping-pong -i 22.0.0.3 -p 5001 -m 64 -t 10 --mps=max
 VMA INFO: ---------------------------------------------------------------------------
 VMA INFO: VMA_VERSION: 8.6.10-0 Development Snapshot built on Jun 27 2018 16:06:47
 VMA INFO: Cmd Line: sockperf ping-pong -i 22.0.0.3 -p 5001 -m 64 -t 10 --mps=max
 VMA INFO: Current Time: Tue Sep 18 08:47:50 2018
 VMA INFO: Pid: 20134
 VMA INFO: OFED Version: MLNX_OFED_LINUX-4.4-1.0.0.0:
 VMA INFO: Architecture: x86_64
 VMA INFO: Node: r-aa-apollo04.mtr.labs.mlnx
 VMA INFO: ---------------------------------------------------------------------------
 VMA INFO: VMA Spec                       Latency                    [VMA_SPEC]
 VMA INFO: Log Level                      INFO                       [VMA_TRACELEVEL]
 VMA INFO: Ring On Device Memory TX       16384                      [VMA_RING_DEV_MEM_TX]
 VMA INFO: Tx QP WRE                      256                        [VMA_TX_WRE]
 VMA INFO: Tx QP WRE Batching             4                          [VMA_TX_WRE_BATCHING]
 VMA INFO: Rx QP WRE                      256                        [VMA_RX_WRE]
 VMA INFO: Rx QP WRE Batching             4                          [VMA_RX_WRE_BATCHING]
 VMA INFO: Rx Poll Loops                  -1                         [VMA_RX_POLL]
 VMA INFO: Rx Prefetch Bytes Before Poll  256                        [VMA_RX_PREFETCH_BYTES_BEFORE_POLL]
 VMA INFO: GRO max streams                0                          [VMA_GRO_STREAMS_MAX]
 VMA INFO: Select Poll (usec)             -1                         [VMA_SELECT_POLL]
 VMA INFO: Select Poll OS Force           Enabled                    [VMA_SELECT_POLL_OS_FORCE]
 VMA INFO: Select Poll OS Ratio           1                          [VMA_SELECT_POLL_OS_RATIO]
 VMA INFO: Select Skip OS                 1                          [VMA_SELECT_SKIP_OS]
 VMA INFO: CQ Drain Interval (msec)       100                        [VMA_PROGRESS_ENGINE_INTERVAL]
 VMA INFO: CQ Interrupts Moderation       Disabled                   [VMA_CQ_MODERATION_ENABLE]
 VMA INFO: CQ AIM Max Count               128                        [VMA_CQ_AIM_MAX_COUNT]
 VMA INFO: CQ Adaptive Moderation         Disabled                   [VMA_CQ_AIM_INTERVAL_MSEC]
 VMA INFO: CQ Keeps QP Full               Disabled                   [VMA_CQ_KEEP_QP_FULL]
 VMA INFO: TCP nodelay                    1                          [VMA_TCP_NODELAY]
 VMA INFO: Avoid sys-calls on tcp fd      Enabled                    [VMA_AVOID_SYS_CALLS_ON_TCP_FD]
 VMA INFO: Internal Thread Affinity       0                          [VMA_INTERNAL_THREAD_AFFINITY]
 VMA INFO: Thread mode                    Single                     [VMA_THREAD_MODE]
 VMA INFO: Mem Allocate type              2 (Huge Pages)             [VMA_MEM_ALLOC_TYPE]
 VMA INFO: ---------------------------------------------------------------------------
sockperf: == version #3.5-no.git ==
sockperf[CLIENT] send on:sockperf: using recvfrom() to block on socket(s)

[ 0] IP = 22.0.0.3        PORT =  5001 # UDP
sockperf: Warmup stage (sending a few dummy messages)...
sockperf: Starting test...
sockperf: Test end (interrupted by timer)
sockperf: Test ended
sockperf: [Total Run] RunTime=10.000 sec; Warm up time=400 msec; SentMessages=5166035; ReceivedMessages=5166034
sockperf: ========= Printing statistics for Server No: 0
sockperf: [Valid Duration] RunTime=9.550 sec; SentMessages=4951987; ReceivedMessages=4951987
sockperf: ====> avg-lat=  0.951 (std-dev=0.034)
sockperf: # dropped messages = 0; # duplicated messages = 0; # out-of-order messages = 0
sockperf: Summary: Latency is 0.951 usec
sockperf: Total 4951987 observations; each percentile contains 49519.87 observations
sockperf: ---> <MAX> observation =    4.476
sockperf: ---> percentile 99.999 =    1.318
sockperf: ---> percentile 99.990 =    1.270
sockperf: ---> percentile 99.900 =    1.179
sockperf: ---> percentile 99.000 =    1.110
sockperf: ---> percentile 90.000 =    0.967
sockperf: ---> percentile 75.000 =    0.952
sockperf: ---> percentile 50.000 =    0.943
sockperf: ---> percentile 25.000 =    0.936
sockperf: ---> <MIN> observation =    0.895
@endcode

@section _licensing 4. LICENSING

  Read "copying" file in the root place.

@section _installation 5. INSTALLATION

@subsection _requirements 5.1 Requirements

What you will need to compile sockperf on Unix systems

   - perl 5.8+ (used by the automake tools)

   - GNU make tools: automake 1.7+, autoconf 2.57+, m4 1.4+ and libtool 1.4+

   - A Compiler, among those tested are:
      - gcc4+ (Ubuntu)
      - gcc4+ (Red Hat)

@subsection _options 5.2 Options to compile


@subsection _install 5.3 How to install

   Download sockperf-\<version\>.tar.gz.

   Uncompress *.tar.gz file in Unix systems in the same folder with the file
   by runing the following command in the shell:
@code
   tar -zxvf sockperf-<version>.tar.gz
@endcode
   or 2 command:
@code
   gzip -d ./sockperf-<version>.tar.gz
   tar -xf ./sockperf-<version>.tar
@endcode

  The sockperf package uses the GNU autotools compilation and installation
  framework.

  These are generic installation instructions.

   The `configure' shell script attempts to guess correct values for
various system-dependent variables used during compilation.  It uses
those values to create a `Makefile' in each directory of the package.
It may also create one or more `.h' files containing system-dependent
definitions.  Finally, it creates a shell script `config.status' that
you can run in the future to recreate the current configuration, a file
`config.cache' that saves the results of its tests to speed up
reconfiguring, and a file `config.log' containing compiler output
(useful mainly for debugging `configure').

   If you need to do unusual things to compile the package, please try
to figure out how `configure' could check whether to do them, and mail
diffs or instructions to the address given in the `README' so they can
be considered for the next release.  If at some point `config.cache'
contains results you don't want to keep, you may remove or edit it.

   The file `configure.in' is used to create `configure' by a program
called `autoconf'.  You only need `configure.in' if you want to change
it or regenerate `configure' using a newer version of `autoconf'.

The simplest way to compile this package is:

  1. `cd' to the directory containing the package's source code and type
     `./configure' to configure the package for your system.  If you're
     using `csh' on an old version of System V, you might need to type
     `sh ./configure' instead to prevent `csh' from trying to execute
     `configure' itself.

     Running `configure' takes awhile.  While running, it prints some
     messages telling which features it is checking for.
@code
    $ ./configure --prefix=<path to install>
@endcode

   There are several options to ./config (or ./Configure) to customize
   the build:

  To enable test scripts
@code
    $ ./configure --prefix=<path to install> --enable-test
@endcode

  To enable the documentation
@code
    $ ./configure --prefix=<path to install> --enable-doc
@endcode

  To enable the special scripts
@code
    $ ./configure --prefix=<path to install> --enable-tool
@endcode

  To compile with debug symbols and information:
@code
    $ ./configure --prefix=<path to install> --enable-debug
@endcode

   This will define the _DEBUG variable at compile time.

   Type './configure --help' for a list of all the configure
   options. Some of the options are generic autoconf options, while the SockPerf
   specific options are prefixed with "SOCKPERF:" in the help text.

  2. Type `make' to compile the package.
@code
    $ make
@endcode

  3. Optionally, type `make check' to run any self-tests that come with
     the package.

  4. Type `make install' to install the programs and any data files and
     documentation.
@code
    $ make install
@endcode

  5. You can remove the program binaries and object files from the
     source code directory by typing `make clean'.  To also remove the
     files that `configure' created (so you can compile the package for
     a different kind of computer), type `make distclean'.  There is
     also a `make maintainer-clean' target, but that is intended mainly
     for the package's developers.  If you use it, you may have to get
     all sorts of other programs in order to regenerate files that came
     with the distribution.

*/
