usr recycling

simple!However, the code above has a bug, and if there are many child processes exiting at the same time, the parent process will be sent a signal.And we know that due to the constraints of the bitmap, the conventional signal appears multiple times, only one time. Therefore, if there is a child process at the same time, the above code must not be all the child processes are recycled!So, we need to strengthen the code!!!!Upgrade Core Codevoid waitChild2 (int sig) {int status = 0;pid_t PID = 0;wh

) each time a 1 Revisedobjectinheap object is created, but it consumes 2M of out-of-heap memory. Such a heap of memory is sufficient (in which case garbage collection of heap memory is not performed), but the out-of-heap memory is insufficient, so OutOfMemoryError is not reported . Although the improved REVISEDOBJECTINHEAP does not have an out-of-heap memory leak, this workaround wastes heap memory unnecessarily. A simple look at the next Bytebuffer source, its internal allocation of external me

object can be associated with another thread). If the queue is created successfully, the queue is entered, and the failure (queue number greater than maxdelayedqueues) discards the object (freed by the JVM Recycle) Note: 1) The object is reclaimed by the weakorderqueue of the local thread, The reason for doing this is to avoid concurrency (races competition), and not every object has an object recycle pool to reclaim, if exceeding the maximum capacity limit is discarded, and the local thread st

MINORGCThe second step there is a risk, if the guarantee fails, it will be a FULLGC, so the cost is greater, because the prevention work is not done well, MINORGC can not finish the ride to a full. In the old age, because there may be 100% survival, so the replication algorithm will lead to insufficient space, the general use of tag-collation algorithm. The JVM generally uses the method of generational collection. garbage collector: There are serial parallel collectors and many other 2. Memory

enters the back-end and returns false, and other circumstances cause the call of the stop function of the activity to return true * @return/PU Blic Boolean Isonforeground () {Activitymanager Activitymanager = (Activitymanager) getapplicationcontext (). GetSystemService (Cont Ext. Activity_service); String PackageName = Getapplicationcontext (). Getpackagename (); list Supplementary Note: Can be based on the different importance to judge the foreground or backstage, runningapppr

initialize Sharding On all connections, so, we get exceptions if sharding are enabled on//the collection. Bsonobj result; bool OK = VERSIONMANAGER.INITSHARDVERSIONCB (conn, result);//Send Setshardversion command, pass to local ServerID Assert that we actually successfully setup sharding}} Continue to see the release of the connection. Scopeddbconnection::d One void Done () { _conn->clearauthenticationtable (); Pool.release (_host, _conn); _conn =

) { + //TODO auto-generated Catch block A e.printstacktrace (); at}finally{ - if(conn!=NULL){ - Try { - conn.close (); -SYSTEM.OUT.PRINTLN ("Client close connection .....")); -}Catch(SQLException e) { in e.printstacktrace (); - } to } + } -SYSTEM.OUT.PRINTLN ("Connecting numbers in a connection pool" +databasepool.connPool.size ()); the } * $}Create a connection ....Client connection .....Connections in the connecti

The/usr file system is often large because all programs are installed here. All files in/usr typically come from Linux distribution, locally installed programs and other things under/usr/local. This may not require reinstalling all of the programs when upgrading a new version of the system or distribution./usr/bin : Th

The first line of the scripting language is to point out that you want the code in your file to run it with what executable program.For example, the first line of the PHP script can be written in the following formats#!/usr/bin/php#!/usr/bin/env php#!/usr/bin/env-s-p/usr/local/bin:/

Linux system file structure, there is such a magical directory that is USR. I've never been to pay attention to it before, anyway, the program has been installed in the inside, I do not know what the use of the place, and then fedora to simplify the entire file system system, this only to see the existence of it, usr what is the abbreviation of what is it? Here is a small set to tell you the

In a Linux system, there is a very important directory--/usr directory. On the origin of this directory name, the main online has the following several statements: User's initials User shareable read-only abbreviation Abbreviation for Unix/user System Resources Abbreviation for Unix/user Software Resources Most versions of the Linux/usr directory are currently placed primarily with executables and firs

Start disk partition/,/home,/boot, swap But when I use the offline upgrade method from 11.04, I found that all the software in/USR was lost, but then many software had to be installed again, so I decided to mount/usr again. Mount Step (Root permission execution):1. Init 1-Switch to Single-user mode. A personal user like me should not need it. I didn't do it anyway.2. cp-ax/

Tags: some port 5.5 SQL database Configuration Run step this mediumBefore I installed the MySQL database, because my MySQL is not installed in the standard/usr/local/mysql directory, but installs in the/usr/local/development/ The mysql-5.5.25 directory causes the error to report that the/usr/local/mysql directory could not be found when the MySQL service is start

Tags: system software operation font res install library file str custom software InstallationImportant: USR is the abbreviation for UNIX software resource, which is the directory placed by the UNIX operating system software resource.The following is an article that the individual found suitable for similar to my this from Windows to Linux small white.Ref: 48324377Linux Software Installation directory is also very fastidious, understand this, in the m

/usr/local/lib/libz.a:could not read Symbols:bad value (64-bit Linux)/USR/BIN/LD:/usr/local/lib/libz.a (CRC32.O): Relocation r_x86_64_32 against ' a local symbol ' can not is used when making a Shared object; Recompile with-fpic/usr/local/lib/libz.a:could not read Symbols:bad valueTypically 64-bit computers will appear

The following error was reported when Sudo was first runSudo:must be setuid root, so the Internet to find a solution, the search came out of the way to solveLs-l/usr/bin/sudoChown Root:root/usr/bin/sudochmod 4755/usr/bin/sudoRebootI tested the conclusion that this method is feasible, but not clear, need to have root execution permissions , if not to log in as roo

When Linux installs the software, I always have the idea that the software is installed in that directory. Because the Linux system differs from the Windows system, instead of creating a folder on that disk, install the program you need to install to the specified directory. The Linux directory is similar to a tree, the topmost is its root directory, each directory has its own different function. Linux Software Installation directory is also fastidious, the correct choice of installation directo

Today in the 64-bit red Hat Enterprise Linux as Release 4.7 Compile PHP5.2.6 error, MySQL is used by the RPM method installed, PHP compiled code as follows: ./configure--prefix=/usr/local/php--with-mysql--with-apxs2=/usr/local/apache/bin/apxs--with-openssl--with-curl --enable-xml--with-mcrypt--with-ttf--enable-magic-quotes--enable-fastcgi--enable-mbstring-- Enable-mbstring--with-gd--with-jpeg-dir--w

In view CactiEZ found login not up, log on to find out the disk space is insufficient, finally found MySQL error log up to 10G, through the log discovery:[[emailprotected] bin]# tail-f/var/log/mysqld.log2018-03-02 15:54:17 31645 [ERROR]/usr/sbin/mysqld:table './ Cacti/poller_item ' is marked as crashed and should be repaired2018-03-02 15:54:17 31645 [ERROR]/usr/sbin/mysqld:table '. /cacti/poller_item ' is m

Linux file structure, there is a very magical directory--/usr. has not been how to pay attention to it before, anyway, the program is installed in the inside, and there is nothing to be traced to things. Until one day, fedora to simplify the entire filesystem system, see the discussion to think, what is the abbreviation of USR, what is it? In the discussion, most of the views were that: 1.