P, upgrade the young area to the size of the older area in the older area, etc.

The first thread is responsible for recovering the young area of the heap
When the second thread is running out of heap, the heap is traversed, and the size of the older area of the older area is equal to-xmx minus-xmn, and the value of-XMS cannot be set too large because the second thread is forced to run to degrade the performance of the JVM.

The JVM's garbage collection mechanism for detailed understanding and tuning
GC Overview for 1.JVM

A GC is a garbage collection mechanism that is used by the JVM to free memory that is consumed by objects that are no longer in use. The Java language does not require the JVM to have a GC, nor does it stipulate how the GC works. However, the common JVM has GC, and most GC uses a similar algorithm to manage memory and perform collection operations.

After fully understanding the garbage collection algorithm and the execution process, it can effectively optimize its performance. Some garbage collection is dedicated to special applications. For example, real-time applications are primarily designed to avoid garbage collection outages, while most OLTP applications focus on overall efficiency. With an understanding of the workload of the application and the garbage collection algorithms supported by the JVM, the garbage collector can be optimally configured.

The purpose of garbage collection is to clear objects that are no longer in use. The GC determines whether to collect the object by determining whether the object is referenced by the active object. The GC first determines whether the object is ready to be collected. Two common methods are reference counts and object reference traversal.

1.1. Reference counting

The reference count stores all references to a particular object, that is, when the application creates a reference and the reference goes out of scope, the JVM must increase or decrease the number of references appropriately. When the number of references to an object is 0

Chat History Delete recovery software official Download | Chat history Delete Recovery softwareHow to export someone else's cell phone chat record to a computer view _How does the chat record recover? Deleted Chat Record recovery Method-Chat text record deleted how to recoverApple Phone chat records can be queried, deleted records can also be restorediphone apple phone chat record deleted how to recover? _Delete Record recovery recover deleted chat recordRecover deleted chat RecordsHow to restore your phone's chat history on your computerHow to recover deleted chat Records _How to recover a deleted chat recordHow to retrieve deleted chat history picturesthe photos in the chat record are deleted.How to retrieve deleted informationHow to recover deleted history.How to recover deleted chat logs and voice records.How did the deleted photoswhat can I do to export my chat history? _How does the content export to view? How does the chat record export backup to the computer? _How to export chat history on the computer to see the chat record _How to export chat history to other phonesHow can I delete a record before I export it? How to export mobile chats to PCHow to export your phone's chat history2014 How do I check my wife's deleted records?How to export chat history to watch chat history on the computerHow can I view the contents of a mobile phone message deleted by others?How do I check the contents of a mobile phone message deleted by others?How to query deleted SMS content? How do I check someone's cell phone records?How to find out what someone has deleted from your mobile phone messageHow to check other people's mobile phone message content, deleted mobile phone messages can be restored??What can you do to see what other people have deleted from your mobile phone message?inquire about other people's mobile SMS content-How to check others mobile Unicom SMS contentHow to completely delete your own and other people's mobile SMS content[Beijing] How to delete can see others mobile phone SMS Content inquiry online Business HallApple Mobile SMS deleted how to recover, iphone check others SMS contentHow to check cell phone records??How to check the history of other people's mobile phone call history?on the Internet how to inquire about the deleted mobile phone call logs and text messages sent to send and receive content _How to check the phone records of others, China Mobile number How to check the call record?How to check the phone records of others in China Mobile online business Hall?Unicom Online How to check the call record, restore phone call details? How to check the history of other people's phone call history?How to check the phone call record and how to retrieve the deleted call? What is the net ?????????How can I monitor other people's call records? How to monitor other people's mobile phone number call records _"How to monitor someone else's cell phone, check someone else's cell phone call history"How to monitor other people's cell phones, check other people's mobile phone recordsHow to monitor other people's cell phones, check other people's mobile phone recordshow to eavesdrop on other people's mobile phone conversations? How to monitor someone's phone? How to eavesdrop on SMSHow to monitor someone's cell phone call record text message record call content SMS content downloadHow do you monitor someone else's phone voice call history?How to monitor other people's phone records?How to monitor other people's mobile phone record content ?How can I monitor the voice call history of someone's cell phone number?How to recover the computer deleted QQ chat record? How to recover deleted chat records in QQHow to recover deleted QQ Chat recordHow to recover QQ chat record should be deleted _How to view QQ chat record? Deleted how to recoverHow to recover deleted QQ Chat record _help How to restore the phone QQ chat record??? "How to recover a deleted QQ roaming history chat record"re-download the new version of QQ, how to retrieve the original chat history?"How to use the computer to recover accidentally deleted QQ Chat record on the phone"How to restore someone else has deleted the QQ chat recorddeleted QQ Chat record how to recover how to viewQQ Inspector Chat record monitoring softwarewho can recommend a QQ chat record monitoring software ahQQ Chat record monitoring |itssh chat record monitorHow to monitor other people's computer QQ chat recordfind a QQ remote chat record monitoring softwareNetwork monitoring can you see the QQ chat record ?How to check QQ history chat record, how to recover deleted QQ chat?How to restore a deleted history chat record"How to recover a deleted QQ roaming history chat record"How to check QQ history chat record, how to recover deleted QQ Chat recordHow to check QQ chat record, how to restore the deleted history chat record?How to recover the deleted QQ History chat recordHow to recover deleted QQ chat record, how to check the previous history recordHow to restore a deleted history SMS QQ Chat Record _Excuse me: how can I monitor someone's chat history? How to monitor other people's chat record in real time?How to retrieve deleted chat history? Chat record accidentally deleted how to recover! Can you restore it back?can you tell me how to recover the deleted chat record?Delete the chat record recovery method? How do I recover deleted chats? Record can be recovered back?? Do not know the password how to view chat history! Don't know the password how to view chat historydo not know the other person's password how to view his chat history?How to view other people's QQ chat record! Do not know the password can be checked ?Do not know the password how to view other people's chat record? _know the password, how to view other people chat recordpassword How to steal view Chat historyHow do I view someone's chat history? What software can crack someone else's q-q password?is there software to crack someone else Q-q password ?How can I crack someone else Q-q space album password?How to hack someone else's q-q passwordHow can I crack someone else's Q-q passwordknow q q number can crack password? is there any software that can crack someone else's Q-q code?Professional answer: How to crack other people qq password, there is software can break decodingq q Password can be cracked ?How to break the QQ login password (qq password hack)can someone crack the Q-q code?is it possible to hack the Q-q password online now?How to hack someone else's WeChat password to keep them from discoveringHow to crack WeChat password to not be the master of WeChat know?How can you hack someone else's WeChat password?WeChat password crack method, how to crack micro-letter passwordHow to crack WeChat password, how to crack micro-letter others password to begWeChat password is not being cracked today even said the wrong passwordhow can an Apple phone chat record not be restoredhow can I recover accidentally deleted chat records?How can I recover deleted chat historyHow can I recover a chat history?How to secretly check my husband's chat record? How to secretly view other people's chat history? How to view someone's chat history informationI want to secretly check the husband's chat record. What's the best way?Why don't you let your husband know that he secretly checked his chats?How to secretly look at other people's chat records do not find? Why don't you let your husband know he's talking to him secretly?How to query the chat record by QQ number4 How to view chat history on your computersupply How not to let the husband know secretly check his QQHow to view the login record?How to export someone else's cell phone chat record to a computer view _How to view other people's cell phone chat records do not know the passwordHow to view other people's chat records without knowing the QQ password of othersIf you do not know the QQ password of other people how to view the QQ chat record AhHow to view other people's QQ chat record on the computerMaster into! How to view other people's QQ chat record!How to see the other phone QQ chat record (She does not know the case) _How to view other people's QQ chat record! Do not know the password can be checked ?How to let people can't see my QQ chat recordhow to not be seen by others chat record Ah _not the same computer how to see QQ chat record?Ask a question, how can ensure QQ chat record in the company will not be detected???know the boyfriend's QQ password how can not let him find to see his chat record??Why QQ Friends are missing, how to see the chat recordHow can we not be monitored? Not be checked to see their QQ chat record? _How can I not let others see my deleted QQ chat record?can you see QQ chat record without landing QQ?can I use my mobile number to locate someone else's specific location ?as long as you know the mobile phone number can be located in the location of the search??can you locate someone else's location by mobile phone number?can you locate someone else's location by mobile phone number?can you navigate to a specific location by someone else's mobile phone number?can you find the exact location of the other person by mobile phone number?can you locate someone else's location by phone number?accidentally put the SMS text message content deleted how to restore back to check ah? How do I view my girlfriend's chat history? How can I view the chat history, delete it and restore it back? How to recover mobile QQ chat recordHow to recover deleted chat records? How to resume QQ chat recordHow to recover deleted QQ Chat record, urgent request! Chat Record deleted How to view mobile login! How to check the QQ chat record in a period of time AH? How to view the QQ chat record of mobile phone login on the computerHow to check QQ chat record!! is to use the mobile phone login QQ Chat record can be found on the computer? How to view QQ all deleted chat record that! my girlfriend's chat record deleted how to recover back to view?How do I find out what my girlfriend deleted from my chat history?How to check the girlfriend chat record is deleted can restore back? _How do I check my girlfriend's chat history? How to recover deleted notesHow to view someone else's chat history to retrieve deleted recordsHow to see the husband cell phone chat record deleted can be retrievedthe information deleted how to get back, how to view other people chat recordhow can I see my girlfriend chat history deleted to restore it back ?How can i restore the deleted chat record back?how to recover to see my girlfriend deleted chat historyHow do I retrieve a previously deleted record?Chat Record deleted how to recover _Delete Record recovery recover deleted chat recordHow does the chat record recover? Deleted Chat Record recovery method?How to recover the deleted records!How is the chat record deleted?How can I recover a deleted record?How to check someone else's chat history, chat History viewer?record export Assistant |iphoneqq record Export Assistant | Mo Mo Record Export Assistant | official website?Record can query _how can I see how my Chat history is restored?How does the iphone view chat history?iphone Chat History view chat history?How to view Apple iphone chat Historycan the deleted chats be recovered on the computer?My chat record accidentally deleted, how to recover? Is there any way to get back ?Chat Record deleted can I get it back? QQ Chat record deleted How to retrieve it?How to retrieve the chat record deleted???How to retrieve the chat record deleted??The chat record was deleted by the wife, still can get back?How to query other people's phone chat records, the deleted part of the record can be restored back.I want to restore the deleted chat records back, OK? _is the chat record deleted and can I restore it on my computer?Chat Record deleted how to recover backQQ History Chat record (deleted) How to get back?How to find the photos in QQ history chat record? _ask QQ master, QQ record in deleted case how to retrieve the history record?How do I recover a deleted QQ chat history?How to recover deleted qq chat history?Resume Phone qq deleted history Chat message recordHow to check QQ history chat record, how to recover deleted QQ chat record?How to recover the deleted QQ chat history?do not know the QQ password, how to restore the deleted QQ chat history?How to delete QQ chat record in computer? How did it get back? qq2013 version Delete all chat records how to recover?Please ask the owner to delete the chat record in QQ, how to recover back? QQ Chat record accidentally deleted can still recover?help my husband's QQ chat record accidentally deleted can still recover back?QQ Chat Record accidentally deleted, can restore back? Ask for helpQQ Chat Record accidentally deleted, help how to get back? QQ Chat Record accidentally deleted, can you find it back ?QQ Chat record accidentally deleted can recover? My husband has deleted the QQ chat record can also resume viewing it ?I'd like to ask if the chats that were accidentally deleted can still be recovered?QQ Chat Record accidentally deleted, how can get back?My husband's QQ chat record accidentally deleted can still recover back? Help! how can I get my phone back? Short note record? _lost the phone, how to retrieve the previous call record.The phone is taken, through the call list can be recovered ?Check the call logs, retrieve the missing cell .Mobile phone Call list printing, how to view other people's SMS contentThe phone is lost, can you find it? How to delete the information of the Open room ?Mobile User Call log deleted how to find back-supply deleted mobile phone text message, call list how to findThe phone just dropped, can you check the call list? What procedures are required? How to check the phone records online? How to check the call log list how to recover the call log listcall History How to query the mobile Call log query stepsMobile phone Call log list query? China Mobile How to check the call record? Helphow to be on the Internet to mobile search call records _400 How to check the call list?How to query 400 phone list _ How to query 400 phone list? How to view other people's chat record on the computer??? How do I view chat history on my computer? How can I view a record of someone else's chats on my computer? how can I see someone else's chat history on my computer? How can I view someone's chat history on my computer? How to view other people's Mo chat record on the computer? that person knows how to view a friend's chat history with someone else.How to view other people's QQ chat record? How to see other people QQ chat record, how can I see someone else's chat record? who can help how to check someone else's chat history? There is no way to see other people's Chat record!How can I view someone's chat historyHow do I view someone else's computer chat history? is there anyone who knows the new QQ can watch other people's chat record?"How can I see someone else's chat history?"boyfriend in My Computer login QQ, I do not know the password, how to view the chat record ah. Kneelingdo not know the QQ password, you can check the chat day record? _I would like to ask you master: In the case of people who do not know QQ password How to view QQ chat record Ah actually do not use QQ password,In fact, no QQ password, you can view a person's chat recorddo not know the QQ password, can you find the chat record ?is there any way you can steal QQ password when others do not know to view QQ chat recordHow to view QQ chat record? In the case of not knowing the password, urgent? _know the phone number can be located according to the signal to the specific location of the phone? _can you locate a person by mobile number?is there any privacy? The mobile phone number is positioned so detailed.can you locate a person by mobile number?set a location phone number, but can't show his location, why?I know the other person's mobile phone number, can be located in each other's specific location ?How to use the phone to locate each other's location. Can you find a specific address based on your phone number?How to use the phone to locate each other's location. Can you find a specific address based on your phone number?How to locate your phone before shutting down? The phone number is off and you can locate it.

P, upgrade the young area to the size of the older area in the older area, etc.