Boomer is a better load generator for locust, written in golang. It can spawn thousands of goroutines to run your code concurrently.

It will listen and report to the locust master automatically, your test results will be displayed on the master's web UI.

https://github.com/myzhan/boomer

host1:~# iperf -s -p 7870 -u
------------------------------------------------------------
Server listening on UDP port 7870
Receiving 1470 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.1 port 7870 connected with 192.168.1.1 port 45467
[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total Datagrams
[  3]  0.0-10.1 sec   494 KBytes   402 Kbits/sec   0.021 ms    0/  344 (0%)
[  4] local 192.168.1.1 port 7870 connected with 192.168.8.8 port 43130
[  4]  0.0-10.1 sec   494 KBytes   402 Kbits/sec   0.023 ms    0/  344 (0%)
[  3] local 192.168.1.1 port 7870 connected with 192.168.8.8 port 47294
[  3]  0.0-10.1 sec   494 KBytes   402 Kbits/sec   0.048 ms    0/  344 (0%)

they ran a test from a "good" host by sending a UDP request larger than the allowed MTU:

host2:~# iperf -c host1 -u -p 7870 -l 3832
------------------------------------------------------------
Client connecting to sd6pstg-35b5, UDP port 7870
Sending 3832 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 192.168.8.8 port 47294 connected with 192.168.1.1 port 7870
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.1 sec  1.26 MBytes  1.05 Mbits/sec
[  3] Sent 344 datagrams
[  3] Server Report:
[  3]  0.0-10.1 sec   494 KBytes   402 Kbits/sec   0.048 ms    0/  344 (0%)

They ran the same test on a "bad" host:

host3:~# iperf -c host1 -u -p 7870 -l 3832
------------------------------------------------------------
Client connecting to sd6pstg-35b5, UDP port 7870
Sending 3832 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 192.168.9.9 port 38406 connected with 192.168.1.1 port 7870
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.1 sec  1.26 MBytes  1.05 Mbits/sec
[  3] Sent 344 datagrams
[  3] WARNING: did not receive ack of last datagram after 10 tries.

sysctl -a |grep udp

sudo ifconfig eth0 mtu 800

ip route flush cache

ping -s 1520 -M dont -i 0.8 192.168.1.1

tcpdump -vv -i eth0 host 192.168.1.1 and udp -n

http://superuser.com/questions/66802/does-linux-have-an-equivalent-of-windows-pmtu-blackhole-router-discovery

so to turn on tcp_mtu_probing

# echo 2 > /proc/sys/net/ipv4/tcp_mtu_probing 

Possible values

0: disabled

1: enabled when black hole detected

2: always enabled 

root@sd6pstg-69c4:~# tracepath -n 192.168.1.1

 1?: [LOCALHOST]                                         pmtu 1464

 1:  169.254.154.42                                        1.429ms 

 1:  169.254.154.42                                        1.058ms 

 2:  169.254.32.144                                        2.134ms 

 3:  169.254.32.19                                         1.034ms 

 4:  no reply

tcpdump -nnvvXSs 1514 -i eth0

• nn = don't resolve host names or port names
  vv = verbosity level (can be v, vv, or vvv)
  X = Payload. Shows packets contents in both ASCII and HEX. If you need the ethernet header us XX instead of just X
  S = prints absolute sequence numbers
  s = allows you to set snaplen (in this case 1514) so we capture the whole packet.
  
  
  

host3:~# cat /proc/sys/net/ipv4/ip_default_ttl

64

sudo sysctl net.ipv4.ip_default_ttl=129

PageSpeed Module - Optimizing For Bandwidth

PageSpeed's default RewriteLevel of CoreFilters is designed to reduce latency, incurring a small risk of page breakage. A related goal, bandwidth reduction, can be achieved with close to zero risk of web-site breakage:

Apache:

ModPagespeedRewriteLevel OptimizeForBandwidth

Nginx:

pagespeed RewriteLevel OptimizeForBandwidth;

This option is suitable for use in a root configuration at a hosting service, CDN, or multi-site setup, in conjunction with InheritVhostConfig. In this mode, PageSpeed does not alter HTML at all. It compresses and transcodes images in place, and minifies JavaScript and CSS. By avoiding changes to URL syntax and to HTML, the potential problem of user-written JavaScript encountering unexpected DOM elements is elimimated. There is still latency benefit due to the reduced size of resources, as well as substantial bandwidth reduction.

Online version

http://jonassebastianohlsson.com/criticalpathcssgenerator/