Guidance:
Check the code first:
Code 1
Using system; 2
Using system. Threading; 3
4
Namespace highcpu 5
{6
Class program 7
{8
Static void main (string [] ARGs) 9
{10
Console. Clear (); 11
Console. writeline ("go to the command line, switch to the windbg directory, and run adplus-Hang-PN highcpu.exe-o C: // dumps"); 12
Console. writeline ("if you want to stop, press Ct
What is a memory dump file?
======================================
There are many types of snapshot. Dump files of a process or system at a given time when a memory dump file is being dumped. Different types of dump files contain non-accurate data.
User-mode memory dump file vs kernel-mode Memory Dump File
======================================
If you capture the dump file of a process, you capture the user-mode dump file.
If you capture the dump file of the entire system memory, you will captu
1. How to capture dump files.
There are two cases:
First case: If yesVistaOrWindows2008The operating system is a simple task. In the task manager, switch to the "processes" tab, right-click the process you want to create the dump file, and select "create Dump File. If you want to create a dumpfile with w3wp.exe, you may see many w3wp files, but you do not know which one is the website you want to capture. You can run the following command to view them. For Vista or win2008 systems:% WINDIR %/
the execution of commands with the same name in other directories, resulting in security risks. Therefore, the absolute path is also used!Cmnd_alias dumps =/usr/bin/mt,/usr/sbin/dump,/usr/sbin/rdump ,\/Usr/sbin/restore,/usr/sbin/rrestoreCmnd_alias kill =/usr/bin/killCmnd_alias printing =/usr/sbin/LPC,/usr/bin/lprmCmnd_alias shutdown =/usr/sbin/ShutdownCmnd_alias halt =/usr/sbin/halt,/usr/sbin/fasthaltCmnd_alias reboot =/usr/sbin/reboot,/usr/sbin/fast
Capture a mini dump and run it! Clrstack will prompt the following error:
* ** Warning: unable to verify timestamp for mscorwks. dllFailed to load data access DLL, 0x80004005Verify that 1) You have a recent build of the debugger (6.2.14 or newer)2) The file mscordacwks. dll that matches your version of mscorwks. dll isIn the version directory3) or, if you are debugging a dump file, verify that fileMscordacwks _ 4) You are debugging on the same architecture as the dump file.For example, an IA64 d
transaction
4
log dump hasn’t finished yet. Tweaking these parameters will make the
5
transaction log dump less often, and the disc_copies tables dump to disk
6
more often. NOTE: these parameters must be set before mnesia is started;
7
changing them at runtime has no effect. You can set them thru the
8
command line or in a config file.
Dc_dump_limit
1
This variable controls how often disc
Introduction to Java Heap dump file analysis tool jhat, heapjhat
Jhat is a Java heap Analyzes Tool ). after JDK6u7, it becomes standard. this command requires some Java development experience. The official website does not provide technical support and customer service for this tool.Usage:
jhat [ options ] heap-dump-file
Parameters:
Options: optional command line parameters. See the following Options
Heap-dump-file: the binary Java heap dump file to be viewed ). If a dump file contains multi
;>>kalePleaseEnterYourAge>>>33PleaseEnterYourGender>>>fPleaseEnterYourTel>>>100111.adduserinfo2.dispalluserinfo3.updateuserinfobyusername4:deluserbyusername5:sortuserinfoby0.exitprogramPleaseselectone>>>2nameagegendertel----------------------------zhuima28f10086nick25m10010kale33f100111.adduserinfo2.dispalluserinfo3.updateuserinfobyusername4:deluserbyusername5:sortuserinfoby0.exitprogramPleaseselectone>>>0
3. complete code
4. File writing and reading
Ideas:
The cPickle concept is introduce
try to remove objects from free lists if possible.
#
# If all this fails, Redis will start to reply with errors to commands
# That will use more memory, like SET, LPUSH, and so on, and will continue
# To reply to most read-only commands like GET.
#
# WARNING: maxmemory can be a good idea mainly if you want to use Redis as
# 'State' server or cache, not as a real DB. When Redis is used as a real
# Database the memory usage will grow over the weeks, it will be obvious if
# It is going to use too
How to generate a dump file using windbg: when the program crashes (crash), you can use windbg to save all the data in the program's memory space for future debugging and analysis, the generated file is called a dump file. Step: 1) Open windbg and attach it to the crash program process. 2) input the command that generates the dump file. dump. You can select different parameters to generate different types of dump files. Option (1):/M command line example :. dump/m c: \
:\Java\jdk1.7.0_75\jre\bin\sunmscapi.dll0x0000000065960000 60kd:\java\jdk1.7.0_75\jre\bin\ Verify.dll0x000000006597000044kd:\java\ Jdk1.7.0_75\jre\bin\management.dll ...3.2-dump:[live,] format=b, File=filenameDumps the Java heap in hprof binary format. Specifies live, which identifies the object that dumps the active state. The resulting file can be viewed by the jhat command.C:\users\administrator>jmap-dump:format=b,file=9208_0413.hprof 9208Dumping H
format information to a file, and cannot write other types of informationwith open ("Test.text","R") as f_obj:data = F_obj.read ()data = eval (data) Print (type (data)) print (data) The program runs as follows:[11, 22, 33, 65, 33]In the above process, we have also implemented the process of serialization and deserialization using the Python's own eval () function, but since serialization and deserialization are implemented in the same program, there is no eval () in othe
Case:JSON data is often used in Web applications to transfer data, essentially converting a dictionary type of data into a string, transmitting a Web page through a string, and then converting the received string into a dictionary-like data requirement : Implement dictionary into string, convert string to dictionary data type, write fileHow to do?
Clear the difference between dumps and dump, dump interface is a file, write directly to the file,
JSON and PickleTwo modules for serializationJSON, used to convert between string and Python data typesPickle for conversion between Python-specific types and Python data typesThe JSON module provides four functions: dumps, dump, loads, loadThe Pickle module provides four functions: dumps, dump, loads, loadThe JSON dumps converts the data type to a string dump to
JSON templates in Python main two features: serialization and deserializationSerialization: Encoding to encode Python data as a JSON stringThe corresponding function has dump and dumpsDeserialization: Decoding decodes JSON strings into Python dataThe corresponding function has load and loadsJSON serialized dumps instance:Base Example>>> import json>>> data=[' foo ', {' Bar ': (' Baz ', None, 1.0, 2)}]>>> print data[' foo ', {' Bar ': ('Baz ', None, 1.
protected]6 7 ImportPickle8 9 " "Ten Pickle: One 1.> is used to convert between Python-specific types and Python data types A the 2.>pickle module provides four functions: dumps, dump, loads, load. - Note: Converting data into a string that is only recognized by the Python interpreter in a special form is called serialization, and what Python-recognized strings are converted to what we can read is called deserialization. - " " the - -Datainfo = {
, ' 23 ', [4,5]])) # 1 or 23 or [4,5] print (Random.sample ([1, ' ", [4,5]],2)]) #列表元素任意2个组合 print (Random.uniform (1,3)) #大于1小于3的小数, such as 1.927109612082716 item=[1,3,5,7,9]random.shuffle (item) #打乱item的顺序, equivalent to "Shuffle" print (item)Third, OS module and SYS moduleAn OS module is an interface that interacts with the operating system to provide system-level operations.The SYS module is used to provide actions related to the Python interpreter.Iv. serializationTwo modules for seriali
Before, in learning Python, always confused the Pickle and JSON module serialization and the use of the inverse of the example, the recent idle time to re-examine the two modules, is basically to understand the difference between them.Two modules for serialization,
JSON, used to convert between string and Python data types
Pickle for conversion between Python-specific types and Python data types
The JSON module provides four functions: dump
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.