生成.trace文件
android.os.Debug类，其中重要的两个方法Debug.startMethodTracing()和Debug.stopMethodTracing()。这两个方法用来创建.trace文件，将从Debug.startMethodTracing()开始，到Debug.stopMethodTracing()结束，期间所有的调用过程保存在.trace文件中，包括调用的函数名称和执行的时间等信息。
把下面代码分别在加在调试起始代码的位置，和终止位置。
- Debug.startMethodTracing(“test”)；
- Debug.stopMethodTracing()；
其中参数test是要创建的trace文件的名称，test.trace。默认路径是/sdcard/test.trace，也可以自己制定/data/log/test，表示文件在/data/log/test.trace。
在SDK中执行 ： .\traceview test.trace
我们可以得到
1.程序中每个线程调用方法的启动和停止时间
2.函数执行的信息和效率分析
dmtracedump
#!/usr/bin/env python
"""
turn the traceview data into a jpg pic, showing methods call relationship
"""
import sys
import os
import struct
import re
################################################################################
######################## Global Variable #####################################
################################################################################
target_thread=1 #the thread that we want to track, filt out other threads
#all_actions = ["enter","exit","exception","reserved"]
all_threads = {}
all_methods = {}
all_records = []
parent_methods = {}
child_methods = {}
method_calls = {}
################################################################################
############################## Methods #####################################
################################################################################
def add_one_thread(line):
fields = line.split("/t")
all_threads[int(fields[0],10)]=fields
def add_one_method(line):
fields = line.split("/t")
all_methods[int(fields[0],16)]=fields
def add_one_record(one):
thread_id,=struct.unpack("B",one[:1])
if (thread_id == target_thread):
tmp,=struct.unpack("L",one[1:5])
method_id= (tmp / 4) * 4;
method_action= tmp % 4;
time_offset,=struct.unpack("L",one[5:])
all_records.append([thread_id, method_id, method_action, time_offset])
def handle_one_call(parent_method_id,method_id):
if not (parent_methods.has_key(parent_method_id)):
parent_methods[parent_method_id]=1
if not (child_methods.has_key(method_id)):
child_methods[method_id]=1
if method_calls.has_key(parent_method_id):
if method_calls[parent_method_id].has_key(method_id):
method_calls[parent_method_id][method_id]+=1
else:
method_calls[parent_method_id][method_id]=1
else:
method_calls[parent_method_id]={}
method_calls[parent_method_id][method_id]=1
def gen_funcname(method_id):
r1=re.compile(r'[/$<>]')
str1=r1.sub("_",all_methods[method_id][1])
str2=r1.sub("_",all_methods[method_id][2])
return str1+"_"+str2
def gen_dot_script_file():
myoutfile = open("graph.dot", "w")
myoutfile.write("digraph vanzo {/n/n");
for one in all_methods.keys():
if parent_methods.has_key(one):
myoutfile.write(gen_funcname(one)+" [shape=rectangle];/n")
else:
if child_methods.has_key(one):
myoutfile.write(gen_funcname(one)+" [shape=ellipse];/n")
for one in method_calls.keys():
for two in method_calls[one]:
myoutfile.write(gen_funcname(one) + ' -> ' + gen_funcname(two) + ' [label="' + str(method_calls[one][two]) + '" fontsize="10"];/n')
myoutfile.write("/n}/n");
myoutfile.close
################################################################################
########################## Script starts from here #############################
################################################################################
if len(sys.argv) < 2:
print 'No input file specified.'
sys.exit()
if not (os.path.exists(sys.argv[1])):
print "input file not exists"
sys.exit()
#Now handle the text part
current_section=0
for line in open(sys.argv[1]):
line2 = line.strip()
if (line2.startswith("*")):
if (line2.startswith("*version")):
current_section=1
else:
if (line2.startswith("*threads")):
current_section=2
else:
if (line2.startswith("*methods")):
current_section=3
else:
if (line2.startswith("*end")):
current_section=4
break
continue
if current_section==2:
add_one_thread(line2)
if current_section==3:
add_one_method(line2)
#Now handle the binary part
mybinfile = open(sys.argv[1], "rb")
alldata = mybinfile.read()
mybinfile.close()
pos=alldata.find("SLOW")
offset,=struct.unpack("H",alldata[pos+6:pos+8])
pos2=pos+offset #pos2 is where the record begin
numofrecords = len(alldata) - pos2
numofrecords = numofrecords / 9
for i in xrange(numofrecords):
add_one_record(alldata[pos2 + i * 9:pos2 + i * 9 + 9])
my_stack=[0]
for onerecord in all_records:
thread_id=onerecord[0];
method_id=onerecord[1];
action=onerecord[2];
time=onerecord[3];
if(action==0):
if(len(my_stack) > 1):
parent_method_id=my_stack[-1]
handle_one_call(parent_method_id,method_id)
my_stack.append(method_id)
else:
if(action==1):
if(len(my_stack) > 1):
my_stack.pop()
gen_dot_script_file()
os.system("dot -Tjpg graph.dot -o output.jpg;rm -f graph.dot");
- Debug.startMethodTracing(“calc”);
- Log.v(LOG_TAGS”+++++++++++++++++++++++++test++++++++++++++++”);
- Debug.stopMethodTracing()；
我拿camera做了个实验，得到的png甚大，这是其中一角：
