A collection of performance-related scripts used by perf101.
exclusive-pin.sh
is a helper script for pinning dom0's VCPUs to initial physical CPUs, and
pinning VCPUs of the online user domains to the remaining physical CPUs. For
usage instructions, type ./exclusive-pin.sh -h.
$ ./exclusive-pin.sh --dry-run
xl vcpu-pin 0 0 0
xl vcpu-pin 0 1 1
xl vcpu-pin 0 2 2
xl vcpu-pin 0 3 3
xl vcpu-pin 17 0 4-23
xl vcpu-pin 17 1 4-23
xl vcpu-pin 17 2 4-23
xl vcpu-pin 17 3 4-23
$ ./exclusive-pin.sh
Note that runtime pinning of VCPUs does currently not also move VMs' memory regions. This means that performance might be slower than expected on NUMA hosts.
multi-iperf.sh
is a helper script for making parallel iperf
sessions to multiple destinations. It can also track CPU usage of a (possibly
remote) host via xentop. For all options, type ./multi-iperf.sh -h.
$ ./multi-iperf.sh -i 10.1.2.110,10.1.2.111 -a
10.1.2.110 931
10.1.2.111 937
AGGREGATE 1868
stats is used for
statistical analyses of streams of numbers. The script is intentionally written
in AWK, since it is one of the very few omnipresent tools that can deal with
floating-point numbers.
$ cat data
737.267
743.735
688.51
737.488
...
$ cat data | awk -f stats
LEGEND:
n = Sample Number
m = Mean
s = Standard Deviation
r = Relative Standard Error
v = Nth Value
STREAM:
n = 1, m = 737.27, s = 0.00, r = 0.00%, v = 737.267
n = 2, m = 740.50, s = 3.23, r = 0.31%, v = 743.735
n = 3, m = 723.17, s = 24.65, r = 1.97%, v = 688.51
n = 4, m = 726.75, s = 22.23, r = 1.53%, v = 737.488
...