bench: add bench to check uv_loop_alive (#4065 1/2)

test: fix benchmark-ping-udp (#2817)

- Fixes the declaration of the benchmark in benchmark-list.h (it was not
previously runnable at all)
- Fixes the benchmark itself hanging infin

test: fix benchmark-ping-udp (#2817)

- Fixes the declaration of the benchmark in benchmark-list.h (it was not
previously runnable at all)
- Fixes the benchmark itself hanging infinitely because the data was
being dropped via ICMP Destination Unreachable errors (meaning nread
was always zero in pinger_read_cb)
+ The data getting lost was fixed by binding the udp socket
- Properly checks for UV_UDP_MMSG_CHUNK, just as an example of what
should generally be done (buf_free is actually a no-op as the buf is
allocated on the stack)

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bench: add `uv_queue_work` ping-pong measurement (#3425)

test: remove `dns-server.c` as it is not used anywhere (#3313)

Signed-off-by: Darshan Sen <darshan.sen@postman.com>

test: added udp ping benchmark (1,10,100 pingers)

The UDP pummel benchmark does not model usual UDP servers well,
in UDP services like DNS, DHCP or NTP, there is usually just one
soc

test: added udp ping benchmark (1,10,100 pingers)

The UDP pummel benchmark does not model usual UDP servers well,
in UDP services like DNS, DHCP or NTP, there is usually just one
socket bound to the registered port and a large number of
requestors asking queries, this benchmark is simple 1 sender : 1 receiver thread
benchmark with multiple senders multiplexing on the event loop.

The test reports number of senders and attained rate of requests,
and is based on TCP benchmark-ping-pong.c.

PR-URL: https://github.com/libuv/libuv/pull/2532
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <s@saghul.net>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

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bench: add 'million async handles' benchmark

bench: add tcp accept benchmarks

bench: add timed and non-timed udp pummel benchmarks

Remove c-ares tests and benchmarks

bench: improve async_pummel benchmark

Benchmark the performance of uv_async_send() when the handle is contended for
by 1, 2, 4 or 8 threads.

bench: add another async handle benchmark

bench: add async handle benchmark

bench: add thread pool I/O benchmark

bench: add lots-of-timers benchmark

bench: add new idle loop count benchmark

bench: measure ticks per second of idle event loop

bench: add thread creation benchmark

bench: add batched TCP writes benchmark

Times how long it takes to queue and write out 1,000,000 short strings.

Add UDP support to libuv.

accept benchmark

add spawn benchmark

Named pipes implementation for Windows

Windows: getaddrinfo support

c-ares integration on windows

Split pump bench into two processes.

And add a pump test with 1 client.