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#
# func-histogram.py : print histogram of given function's execution time
#
# Usage: func-histogram.py [-- -u <unit>] <function>
# Unit is one of ns, us, ms, s, m
#
# $ uftrace script -S scripts/func-histogram.py read
# histogram of function latency of 'read'
#
# < 0us : 0 ( 0.0 %)
# < 1us : 0 ( 0.0 %)
# < 2us : 5 ( 2.3 %)
# < 4us : 11 ( 5.1 %)
# < 8us : 24 ( 11.1 %)
# < 16us : 41 ( 19.0 %)
# < 32us : 68 ( 31.5 %)
# < 64us : 49 ( 22.7 %)
# < 128us : 16 ( 7.4 %)
# < 256us : 2 ( 0.9 %)
# < 512us : 0 ( 0.0 %)
# < 1024us : 0 ( 0.0 %)
# >= 1024us : 0 ( 0.0 %)
#
func = ''
unit = 'us'
histo = None
divider = {
'ns': 1,
'us': 1000,
'ms': 1000000,
's': 1000000000,
'm': 60000000000,
}
def create_histogram():
h = []
# 1 ~ 1024 (logarithm) = 11 + 2 (= lower/upper bounds)
for i in range(13):
h.append(0)
return h
def get_histogram_index(val):
if val < 0:
return 0
val = int(val / divider[unit])
for i in range(11):
if val < (1 << i):
return i+1
return 12
def print_histogram():
print("histogram of function latency of '%s'\n" % func)
total = sum(histo)
if total == 0:
print("no value")
return
print(" < %4d%-2s : %10d (%5.1f %%)" % (0, unit, histo[0], 100.0 * histo[0] / total))
for i in range(11):
print(" < %4d%-2s : %10d (%5.1f %%)" % (1 << i, unit, histo[i+1], 100.0 * histo[i+1] / total))
print(" >= %4d%-2s : %10d (%5.1f %%)" % (1024, unit, histo[12], 100.0 * histo[12] / total))
def parse_args(args):
global func, unit
if args[0] == '-u' or args[0] == '--unit':
unit = args[1]
func = args[2]
else:
unit = 'us'
func = args[0]
#
# uftrace interface functions
#
def uftrace_begin(ctx):
global histo
if len(ctx["cmds"]) == 0:
print("Usage: func-histogram.py [-- -u <unit>] <function>")
print(" Unit is one of ns, us, ms, s or m")
return
parse_args(ctx["cmds"])
if unit not in divider:
print("Usage: invalid unit: %s" % unit)
return
histo = create_histogram()
def uftrace_entry(ctx):
pass
def uftrace_exit(ctx):
global histo
if histo is None:
return
if ctx["name"] != func:
return
if "duration" not in ctx:
return
dur = int(ctx["duration"])
idx = get_histogram_index(dur)
histo[idx] += 1
def uftrace_end():
if histo is None:
return
print_histogram()
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