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|
class Bench
def initialize(desc)
@desc = desc
@code = nil
@file = nil
@failures = ""
@results = 0
if @@printed_header == 0
print_header
end
if @@ftime == 0
@@ftime = `./itest 5`.to_i
end
if @@stpd.nil?
for path in ['/usr/libexec/systemtap/stpd', '/usr/local/libexec/systemtap/stpd']
if File.exist?(path)
@@stpd = path
break
end
end
end
if @@runtime.nil?
for path in ['/usr/share/systemtap/runtime', '/usr/local/share/systemtap/runtime']
if File.exist?(path)
@@runtime = path
break
end
end
end
end
attr_writer :code, :file
attr_reader :failures, :results
def run
Signal.trap("INT") do
cleanup
exit
end
compile
load
@results = `./itest 1`.to_i - @@ftime
sleep 5
`sudo killall -HUP stpd`
`tail #{@dir}/xxx > #{@dir}/xxx.out`
File.open("#{@dir}/xxx.out") do |file|
file.each_line {|line| @failures += line if line =~ /WARNING/}
end
Process.wait
cleanup
end
def print
if @results
printf("runtime: %-20s\t%d\n", @desc, @results)
end
end
private
@dir = nil
protected
# function call overhead
@@ftime = 0
@@printed_header = 0
@@stpd = nil
@@runtime = nil
def cleanup
`/bin/rm -f stap.out` if File.exists?("stap.out")
`/bin/rm -f bench.stp` if File.exists?("bench.stp")
`/bin/rm -rf #{@dir}` unless @dir.nil?
end
def load
fork do exec "sudo #{@@stpd} -rmq #{@dir}/bench.ko > #{@dir}/xxx" end
sleep 5
end
def compile
@dir = `mktemp -dt benchXXXXX`.strip
emit_code
modules = "/lib/modules/" + `uname -r`.strip + "/build"
res=`make -C \"#{modules}\" M=\"#{@dir}\" modules V=1`
if !File.exist?("#{@dir}/bench.ko")
puts res
cleanup
exit
end
end
def emit_code
if @code
begin
f = File.new("#{@dir}/bench.c","w")
f << "#include \"runtime.h\"
#include \"probes.c\"\n
MODULE_DESCRIPTION(\"SystemTap probe: bench\");
MODULE_AUTHOR(\"automatically generated by bench2/run_bench\");\n\n"
f << "static int inst_sys_getuid (struct kprobe *p, struct pt_regs *regs) {\n"
f << @code
f << "\n return 0;\n}
static struct kprobe kp[] = {\n {\n .addr = \"sys_getuid\",
.pre_handler = inst_sys_getuid\n }\n};\n
#define NUM_KPROBES 1\n
int probe_start(void)\n{\n return _stp_register_kprobes (kp, NUM_KPROBES);\n}\n
void probe_exit (void)\n{\n _stp_unregister_kprobes (kp, NUM_KPROBES); \n}\n"
rescue
puts "Error writing source file"
ensure
f.close unless f.nil?
end
makefile = File.new("#{@dir}/Makefile","w")
makefile << "CFLAGS += -Wno-unused -Werror
CFLAGS += -I \"#{@@runtime}\"
obj-m := bench.o
"
makefile.close
else
puts "NO CODE!"
end
end
def print_header
@@printed_header = 1
nproc=`grep ^processor /proc/cpuinfo`.count("\n")
physical_cpus=`grep "physical id" /proc/cpuinfo`.split("\n").uniq.length
model=`grep "model name" /proc/cpuinfo`.match(/(model name\t: )([^\n]*)/)[2]
puts "SystemTap BENCH2 \t" + `date`
puts "kernel: " + `uname -r`.strip + " " + `uname -m`.strip
begin
puts IO.read("/etc/redhat-release")
rescue
end
puts `uname -n`.strip + ": " + `uptime`
if nproc > 1
puts "processors: #{nproc} (#{physical_cpus} physical) #{model}"
else
puts "processors: #{nproc} #{model}"
end
begin
mem=IO.read("/proc/meminfo").split("\n")
puts mem[0] + "\t" + mem[1]
rescue
end
puts "-"*64
check_cpuspeed
@@ftime = `./itest 5`.to_i
puts "For comparison, function call overhead is #@@ftime nsecs."
puts "Times below are in nanoseconds and include kprobe overhead."
puts "-"*64
end
def check_cpuspeed
maxfile = "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
minfile = "/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq"
if File.exist?(maxfile)
maxfreq = `cat #{maxfile}`.to_i
minfreq = `cat #{minfile}`.to_i
if minfreq != maxfreq
`sudo /bin/sh -c \"echo #{maxfreq} > #{minfile}\"`
puts "CPU frequency scaling detected and disabled."
puts "After testing, enable it again by typing (as root)"
puts "echo #{minfreq} > #{minfile}"
puts "-"*64
end
end
end
end
class Stapbench < Bench
def print
if @results
printf("script : %-20s\t%d\n", @desc, @results)
end
end
protected
def load
# we do this in several steps because the compilation phase can take a long time
`stap -kvvp4 -m bench bench.stp &> stap.out`
IO.foreach("stap.out") {|line| @dir = line if line =~ /Created temporary directory/}
@dir = @dir.match(/"([^"]*)/)[1]
if !File.exist?("#{@dir}/bench.ko")
puts `cat stap.out`
cleanup
exit
end
fork do exec "sudo #{@@stpd} -rmq #{@dir}/bench.ko > #{@dir}/xxx" end
sleep 5
end
def compile
emit_code
end
def emit_code
if @file
File.open("bench.stp","w") do |b|
File.open(@file,"r") do |f|
f.each_line do |line|
b.puts(line.sub(/TEST/,'kernel.function("sys_getuid")'))
end
end
end
elsif @code
begin
f = File.new("bench.stp","w")
f << "probe kernel.function(\"sys_getuid\") {\n"
f << @code
f << "\n}\n"
rescue
puts "Error writing source file"
ensure
f.close unless f.nil?
end
else
puts "NO CODE!"
end
end
end
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