statement: "A Java virtual machine has a heap. The heap is the runtime data area, and the memory of all class instances and arrays is allocated from this place. The heap is created when the Java Virtual Machine is started ." "Memory outside of the heap in JVM is called Non-heap memory )".
JVM manages two types of memory: heap and non-heap. In short, heap is the memory available for Java code and is reserved for developers. Non-heap is reserved for JVM, therefore, the method area, JVM internal p
[0x1ebd0000, 0x227d0000, 0x227d0000)Eden Space 49152K, 0% used[0x1ebd0000, 0x1ebd0000, 0x21bd0000]From space 6144K, 55% used [0x21bd0000, 0x21f2a5e8, 0x221d0000)To space 6144K, 0% used [0x221d0000, 0x221d0000, 0x227d0000)Tenured generation total 69632K, used 3182K [0x227d0000, 0x26bd0000, 0x26bd0000)the space 69632K, 4% used[0x227d0000, 0x22aeb958, 0x22aeba00, 0x26bd0000]Compacting Perm Gen Total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)The space 8192K, 35% used [0x26bd0000, 0x26ea
, 0x26bd0000)the space 69632K, 4% used[0x227d0000, 0x22aeb958, 0x22aeba00, 0x26bd0000]Compacting Perm Gen Total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)The space 8192K, 35% used [0x26bd0000, 0x26ea4ba8, 0X26EA4C00, 0x273d0000)Ro space 8192K, 66% used [0x2abd0000, 0X2B12BCC0, 0x2b12be00, 0x2b3d0000)RW Space 12288K, 46% used [0x2b3d0000, 0x2b972060, 0x2b972200, 0x2bfd0000)}, 0.0757599 secs]
-xloggc:filename: In conjunction with the above several, log information to the file for a
55296K, used 3433K [0x1ebd0000, 0x227d0000, 0x227d0000)Eden Space 49152K, 0% used[0x1ebd0000, 0x1ebd0000, 0x21bd0000]From space 6144K, 55% used [0x21bd0000, 0x21f2a5e8, 0x221d0000)To space 6144K, 0% used [0x221d0000, 0x221d0000, 0x227d0000)Tenured generation total 69632K, used 3182K [0x227d0000, 0x26bd0000, 0x26bd0000)the space 69632K, 4% used[0x227d0000, 0x22aeb958, 0x22aeba00, 0x26bd0000]Compacting Perm Gen Total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)The space 8192K, 35% used
Heap Settings
-xms: initial heap Size
-xmx: Maximum heap Size
-xx:newsize=n: Setting the young generation size
-xx:newratio=n: Sets the ratio of the younger generation to the older generation. such as: 3, the ratio of the young generation and the old generation is 1:3, the young generation of the entire young generation of old generation and 1/4
-xx:su
55296K, used 3433K [0x1ebd0000, 0x227d0000, 0x227d0000)Eden Space 49152K, 0% used[0x1ebd0000, 0x1ebd0000, 0x21bd0000]From space 6144K, 55% used [0x21bd0000, 0x21f2a5e8, 0x221d0000)To space 6144K, 0% used [0x221d0000, 0x221d0000, 0x227d0000)Tenured generation total 69632K, used 3182K [0x227d0000, 0x26bd0000, 0x26bd0000)the space 69632K, 4% used[0x227d0000, 0x22aeb958, 0x22aeba00, 0x26bd0000]Compacting Perm Gen Total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)The space 8192K, 35% used
: [defnew: 52568 K-> 3433 K (55296 K), 0.0072126 secs] 55264 K-> 6615 K (124928 K)Heap after GC invocations = 8: Def New Generation total 55296 K, used 3433 K [0x1ebd0000, 0x227d0000, 0x227d0000) Eden space 49152 K, 0% used[0x1ebd0000, 0x1ebd0000, 0x21bd0000)From space 6144 K, 55% used [0x21bd0000, 0x21f2a5e8, 0x221d0000)To space 6144 K, 0% used [0x221d0000, 0x221d0000, 0x227d0000)Tenured generation total 69632 K, used 3182 K [0x227d0000, 0x26bd0000, 0x26bd0000) The space 69632 K, 4% used[0x227d
Keil program in the basic steps of internal RAM debugging online has been very much, I will not repeat, we can search the Internet very much.But sometimes the internal ram is not enough, this need to load the program into the external Ram debugging, and in this process may have a variety of problems, here I will have some of the problems I have encountered and th
.650) this.width=650; "class=" Fit-image "src=" http://s9.51cto.com/wyfs02/M00/26/AA/ Wkiom1nsi9wdlmdfaaaed3beips236.jpg "height=" "border=" 0 "width=" 498 "/>In this example, the average load in 5 minutes and 15 minutes is very low, but the average load in 1 minutes is very high, so I know that the load spike has been relatively recent. In this case, I usually run multiple uptime commands consecutively (or use the top command) to see if the load is going up or down2. What is the high average lo
The basic steps for debugging the Keil program in internal RAM are already available on the Internet, so I will not repeat them here. You can find a lot on the Internet.
However, sometimes the internal RAM is not enough, so you need to load the program into the external RAM for debugging. In this process, various problems may occur, here, I will summarize some o
, tape storage devices, and disc storage devices.
Cache high-speed buffer memory is a special storage subsystem, where frequently used data is copied to facilitate quick access. Memory's high-speed buffer memory stores the content of frequently accessed Ram locations and the storage addresses of these data items. When the processor references an address in the memory, the cache checks whether the address exists. If the address exists, the data is ret
Random-access memory (Random access Memory, or RAM) is a component that is used to temporarily save data in a computer. It can be read and write at any time, and is very fast, usually as a temporary data storage medium for the operating system or other running programs.
RAM memory can be further divided into static RAM (SRAM) and dynamic Memory (DRAM) of tw
Semiconductor memory is widely used in various computing devices such as computers. Compared with hard disk, floppy disk, tape, and other magnetic memory, CD, VCD, DVD, and PD optical memory, and MD magnetic/Optical Memory, semiconductor memory has obvious advantages: fast speed and small size, durable. However, the cost of semiconductor memory is relatively high, and the capacity is not large.
Rom and ram refer to semiconductor memory. The original m
In recent months of the optical storage market, 18X DVD burner has gradually become a hot spot in the market. Although from the performance indicators, 18X and 16X compared with no absolute advantage, but the arrival of 18X DVD burner, but unknowingly the Dvd-ram burn speed from 5X to the 12X. From then on, we no longer need to dvd-ram slow reading and writing speed and depressed. Realize the most efficient
the stored data, but SRAM does not need it. DRAM has a long access clock interval, while SRAM is fast and time-consuming. DRAM consumes low power, high power consumption of SRAM.
At present, the price of the same capacity of SRAM is about 8 times that of SDRAM, and the area is nearly 4 times larger. Therefore, SRAM is often used for fast storage of low-capacity Ram requirements, such as cache (cache ), for example, the L1 cache in the CPU and the L2
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 the computer memory.Ram has two categories: static
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 the computer memory.Ram has two categories: static
1. Generate eboot. bin. The length parsed during download is 0.
Although the eboot content in the BSP package of the original PM architecture is gradually transplanted to the BSP package of the FMD architecture, eboot. the bin is getting bigger and bigger, and later it is sent to a download and cannot download eboot. bin, eboot is downloading eboot. the length parsed in Bin is 0x00000000, but at this time I see eboot. the bin size is 271kb. How can it be 0? Let's take a look at some definitions
Transferred from: http://bbs.meizu.cn/viewthread.php?tid=3058847page=1My topic should be a bit longer. But the general section is as follows:1.LCD ram;--> This item is now over2.OCA Attachment Method;==> This temporarily cannot give the update time, but will be as soon as possible.3. Jieduan a machine so-called semi-anti-wear screen;-->12/23 11:51 has been updated. 4. The use of Meizu for such a long period of experience and advice;-------------------
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.