How Fat is libevent ;)

ab.txt

14:08 kuba@MacBook-Jakub-Oboza:~% ab -c 10 -n 15000 http://127.0.0.1:8081/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)
Completed 1500 requests
Completed 3000 requests
Completed 4500 requests
Completed 6000 requests
Completed 7500 requests
Completed 9000 requests
Completed 10500 requests
Completed 12000 requests
Completed 13500 requests
Completed 15000 requests
Finished 15000 requests


Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8081

Document Path:          /
Document Length:        23 bytes

Concurrency Level:      10
Time taken for tests:   2.659 seconds
Complete requests:      15000
Failed requests:        0
Write errors:           0
Total transferred:      1365637 bytes
HTML transferred:       345161 bytes
Requests per second:    5642.12 [#/sec] (mean)
Time per request:       1.772 [ms] (mean)
Time per request:       0.177 [ms] (mean, across all concurrent requests)
Transfer rate:          501.63 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.6      0      12
Processing:     0    1   1.5      1      22
Waiting:        0    1   1.4      1      22
Total:          1    2   1.6      1      22

Percentage of the requests served within a certain time (ms)
  50%      1
  66%      1
  75%      2
  80%      2
  90%      3
  95%      5
  98%      7
  99%      9
 100%     22 (longest request)

comment.c

/*
  *just the responsiveness of libevent on my old 2 core proccessor is awesome. 5k req/sec 
*/

httpref.txt

# Heavy loaded CPU with flash video while doing test ;)

14:34 kuba@MacBook-Jakub-Oboza:~% httperf --server 127.0.0.1 --num-conn 10000 --num-call 10 --rate 300 --timeout 5 --port 8081
httperf --timeout=5 --client=0/1 --server=127.0.0.1 --port=8081 --uri=/ --rate=300 --send-buffer=4096 --recv-buffer=16384 --num-conns=10000 --num-calls=10
httperf: warning: open file limit > FD_SETSIZE; limiting max. # of open files to FD_SETSIZE
Maximum connect burst length: 7

Total: connections 10000 requests 100000 replies 100000 test-duration 33.332 s

Connection rate: 300.0 conn/s (3.3 ms/conn, <=25 concurrent connections)
Connection time [ms]: min 0.8 avg 2.5 max 82.6 median 0.5 stddev 5.2
Connection time [ms]: connect 0.1
Connection length [replies/conn]: 10.000

Request rate: 3000.1 req/s (0.3 ms/req)
Request size [B]: 62.0

Reply rate [replies/s]: min 2998.2 avg 2999.9 max 3000.2 stddev 0.8 (6 samples)
Reply time [ms]: response 0.2 transfer 0.0
Reply size [B]: header 125.0 content 23.0 footer 0.0 (total 148.0)
Reply status: 1xx=0 2xx=100000 3xx=0 4xx=0 5xx=0

CPU time [s]: user 7.48 system 23.49 (user 22.4% system 70.5% total 92.9%)
Net I/O: 615.3 KB/s (5.0*10^6 bps)

Errors: total 0 client-timo 0 socket-timo 0 connrefused 0 connreset 0
Errors: fd-unavail 0 addrunavail 0 ftab-full 0 other 0

server.c

#include <sys/types.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <event.h>
#include <evhttp.h>

void generic_request_handler(struct evhttp_request *req, void *arg)
{
  struct evbuffer *returnbuffer = evbuffer_new();

  evbuffer_add_printf(returnbuffer, "Thanks for the request!");
  evhttp_send_reply(req, HTTP_OK, "Client", returnbuffer);
  evbuffer_free(returnbuffer);
  return;
}

int main(int argc, char **argv)
{
  short          http_port = 8081;
  char          *http_addr = "127.0.0.1";
  struct evhttp *http_server = NULL;

  event_init();
  http_server = evhttp_start(http_addr, http_port);
  evhttp_set_gencb(http_server, generic_request_handler, NULL);

  fprintf(stderr, "Server started on port %d\n", http_port);
  event_dispatch();

  return(0);
}