used memory

Link: http://www.cnblogs.com/skyme/archive/2011/01/04/1925227.htmlThe following shows the usage of the current memory.-M indicates that the content is displayed in MB bytes. Let's take a look.$ Free-mTotal used free shared buffers cachedMem: 1002 769

Rom and RAM are both semiconductor memory, Rom is short for read only memory, and Ram is short for random access memory. ROM can still maintain data when the system stops power supply, while Ram usually loses data after power loss. A typical Ram is

Document directory 1. Simplified Version 2. Improved Version (overload operators enable class usage like pointers) 3. Improved Version (copy Construction) A smart pointer is actually a class, which encapsulates a pointer. What is its

OracleThe SGA contains several main parts.1. Shared Pool2. Database buffer cacheDatabaseHigh-speed buffer zone3. redo log buffers redo log Buffer4. large pool5. Java poolJavaPool A. Shared Pool:Oracle shared pool includes library cache and

In the data structure on the left heap->free_buckets[ZEND_MM_NUM_BUCKETS*2]; The right side is the segment, with 256 bytes allocated each time +SegmentStructure +Zend_mm_block_infoStructure (the segment structure can clearly find the pointer after

I. ReferencesThe definitions referenced in Java are quite traditional: If the value stored in the reference data represents the starting address of another memory, this memory represents a reference. This definition is pure, but too narrow. An

Environment centos6.5 First, yum install conky If you directly call the default configuration on the terminal at this time, the configuration will be under/etc/conky. conf. We can use our own configuration to write the configuration file under

We know that whenWhen multiple processes coexist in the memory, if the memory is sufficient enough, it would be ideal for everyone to have peace of mind.But the reality is often not that good. Sometimes the memory will be full,Not enough. At this

Java Memory leakage means that the memory garbage is not cleared in time, and the system cannot provide you with memory resources (the memory resources are exhausted );Java memory overflow means that the memory you want to allocate exceeds what the

The Mark-Sweep algorithm first marks all objects to be recycled and then recycles them all. Main disadvantages: 1. low marking and clearing efficiency 2. A large number of discontinuous memory fragments are generated, resulting in the subsequent

When you are involved in C/C ++ core programming, you will have no end to dealing with memory management. These will often make people suffer. So if you want to go deep into C/C ++ programming, you must calm down and have a hard time. Now we will

Java Garbage Collector standard explanation and usage, java garbage collectionOverview When talking about Garbage Collection (GC), most people regard this technology as a companion product of the Java language. In fact, GC has a long history than

The Linux server allocates real and virtual memory to the processor and manages memory usage through swap. Understanding the Linux memory type and how the processor shares memory helps optimize memory usage. Memory is allocated from the Linux kernel

Overview In redis, it is useful to allow users to set the maximum memory usage of server. maxmemory. For example, four redis service points are deployed on an 8g server. Each Service Point allocates GB of memory to reduce memory shortage and obtain

View cpu usage information of processes in memory. for Linux Commands & mdash; TOP, we use the top command to view CPU usage. Top does not produce output, and the screen content remains unchanged. It refreshes the screen to display new information.

1. RoleThe top command is used to display the program process in progress, and the permissions are all users.2. FormatTop [-] [D delay] [Q] [C] [s] [s] [i] [n]3. Main parametersD: Specifies the interval of the update, in seconds.Q: There are no

　　The dynamic allocation of memory and the memory recycling technology are already quite mature, everything seems to be in the "Automation" era, then why do we have to understand the GC and memory allocation? The answer is simple: when you need to

1190000004135982Redis master-slave replicationthe principle of Redis master-slave replicationWhen establishing a master-slave relationship, slave configuration slaveof . The slave server sends a sync command to the primary server. Master accepts

Garbage collector and memory allocation policyOne, GC Collector1. GC recycling three things to think about:A) How to determine which memory needs to be recycled?b) What recycling is used?c) when to recycle?The following is a description of each of

Top results ExplainedThe top command features Windows-like Task Manager, but not as intuitive as the task Manager, and provides a brief description of the contents below. Information Line top--command/up-Update time/users-number