memory

Handling pointers to structure in C#

由 人走茶凉 提交于 2020-02-22 07:00:11
问题 I'm working on project which includes DLL written in C++ and a C# code. Lets say that that DLL has a function: MyStruct* GetPointer(); // returns pointer to MyStruct structure MyStruct structure looks like this: struct MyStruct { OtherStruct1 *data1; OtherStruct2 *data2; }; And OtherStruct1 and OtherStruct2 structures look like this: struct OtherStruct1 { public: double x; char y; }; struct OtherStruct2 { public: float a; float b; float c; float d; }; My question is - what's the best way to

Handling pointers to structure in C#

由 这一生的挚爱 提交于 2020-02-22 06:59:08
问题 I'm working on project which includes DLL written in C++ and a C# code. Lets say that that DLL has a function: MyStruct* GetPointer(); // returns pointer to MyStruct structure MyStruct structure looks like this: struct MyStruct { OtherStruct1 *data1; OtherStruct2 *data2; }; And OtherStruct1 and OtherStruct2 structures look like this: struct OtherStruct1 { public: double x; char y; }; struct OtherStruct2 { public: float a; float b; float c; float d; }; My question is - what's the best way to

Multiprocessing system employing pending tags to maintain cache coherence

由 倾然丶 夕夏残阳落幕 提交于 2020-02-22 00:05:48
A pending tag system and method to maintain data coherence in a processing node during pending transactions in a transaction pipeline. A pending tag storage unit may be coupled to a cache controller and configured to store pending tags each indicative of a coherence state for a data line corresponding to a pending transaction within the transaction pipeline. The pending tag storage unit includes a total amount of storage which is substantially less than an amount required to store tags contained in the full tag array for the cache memory. When a pending tag exists in the pending tag storage

php内存管理机制、垃圾回收机制

由 青春壹個敷衍的年華 提交于 2020-02-21 11:31:20
一、内存管理机制 先看一段代码： <?php //内存管理机制 var_dump(memory_get_usage());//获取内存方法，加上true返回实际内存，不加则返回表现内存 $a = "laruence"; var_dump(memory_get_usage()); unset($a); var_dump(memory_get_usage()); //输出(在我的个人电脑上, 可能会因为系统,PHP版本,载入的扩展不同而不同): //int 240552 //int 240720 //int 240552 定义变量之后，内存增加，清除变量之后，内存恢复（有些可能不会恢复和以前一样），好像定义变量时申请了一次内存，其实不是这样的，php会预先申请一块内存，不会每次定义变量就申请内存。 首先我们要打破一个思维: PHP不像C语言那样, 只有你显示的调用内存分配相关API才会有内存的分配. 也就是说, 在PHP中, 有很多我们看不到的内存分配过程. 比如对于: $a = "laruence"; 隐式的内存分配点就有: 1.1. 为变量名分配内存, 存入符号表 2.2. 为变量值分配内存 所以, 不能只看表象. 第二, 别怀疑,PHP的unset确实会释放内存, 但这个释放不是C编程意义上的释放, 不是交回给OS. 对于PHP来说,

详细分析莫烦DQN代码

由 送分小仙女□ 提交于 2020-02-20 16:28:15
详细分析莫烦DQN代码 Python入门，莫烦是很好的选择，快去b站搜视频吧！ 作为一只渣渣白，去看了莫烦的强化学习入门， 现在来回忆总结下DQN，作为笔记记录下来。 主要是对代码做了详细注释 DQN有两个网络，一个eval网络，一个target网络，两个网络结构相同，只是target网络的参数在一段时间后会被eval网络更新。 maze_env.py是环境文件，建立的是一个陷阱游戏的环境，就不用细分析了。 RL_brain.py 是建立网络结构的文件： 在类DeepQNetwork中，有五个函数： n_actions 是动作空间数，环境中上下左右所以是4，n_features是状态特征数，根据位置坐标所以是2. 函数_build_net(self) ：（讲道理这个注释是详细到不能再详细了） 建立eval网络： # ------------------ build evaluate_net ------------------ # input 用来接收observation self . s = tf . placeholder ( tf . float32 , [ None , self . n_features ] , name = 's' ) # for calculating loss 用来接收q_target的值 self . q_target = tf .

Memory usages high - Slow application response : Used memory value not decreasing + Free memory value not increasing

由 冷暖自知 提交于 2020-02-20 05:23:50
问题 When application is in use for few minutes then it slowly increases the Used memory value and decreases Free memory value. Application get very slow after few minutes. Why isn't it releasing the memory. System configuration : CPU : Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz (No. of processors : 4 / No. of cpu cores : 8) RAM : 30 GB OS : CentOS-7 Application configuration : java version "1.8.0_171" -- build 1.8.0_171-b11 apache-tomcat-7.0.55 Tomcat setting Free -h command Top command . .

Why is a process's address space divided into four segments (text, data, stack and heap)?

由 醉酒当歌 提交于 2020-02-20 04:52:54
问题 Why does a process's address space have to divide into four segments (text, data, stack and heap)? What is the advandatage? is it possible to have only one whole big segment? 回答1: There are multiple reasons for splitting programs into parts in memory. One of them is that instruction and data memories can be architecturally distinct and discontiguous, that is, read and written from/to using different instructions and circuitry inside and outside of the CPU, forming two different address spaces

PHP unset销毁变量并释放内存

由 五迷三道 提交于 2020-02-20 01:28:21
PHP的unset()函数用来清除、销毁变量，不用的变量，我们可以用unset()将它销毁。但是某些时候，用unset()却无法达到销毁变量占用的内存！我们先看一个例子： <?php $s = str_repeat ( '1' ,255); //产生由255个1组成的字符串 $m =memory_get_usage(); //获取当前占用内存 unset( $s ); $mm =memory_get_usage(); //unset()后再查看当前占用内存 echo $m - $mm ; ?> 最后输出unset()之前占用内存减去unset()之后占用内存，如果是正数，那么说明unset($s)已经将$s从内存中销毁(或者说，unset()之后内存占用减少了)，可是我在PHP5和windows平台下，得到的结果是：-48。这是否可以说明，unset($s)并没有起到销毁变量$s所占用内存的作用呢？我们再作下面的例子： <?php $s = str_repeat ( '1' ,256); //产生由256个1组成的字符串 $m =memory_get_usage(); //获取当前占用内存 unset( $s ); $mm =memory_get_usage(); //unset()后再查看当前占用内存 echo $m - $mm ; ?> 这个例子，和上面的例子几乎相同

IE and Memory accumulation in Javascript

由 白昼怎懂夜的黑 提交于 2020-02-17 05:32:04
问题 Here is the test URL http://edventures.com/temp/divtest.php Procedure: Close all IE instances. Open the URL in IE7 Open the task manager, look for memory consumed by IE Now click on Create button, Watch the memory it will jump up by about 2K Now click on Destroy button and the DIV will be destroyed but the memory remains the same. You can try it repeatedly and memory just adds up. Is there any way to fix this? Any way to call Garbage collector forcefully without reloading the window? I am

Performance with dynamically sized arrays in C++ MSVC vs GCC [duplicate]

由 不打扰是莪最后的温柔 提交于 2020-02-16 10:41:27
问题 This question already has answers here : Why aren't variable-length arrays part of the C++ standard? (12 answers) Variable Length Array overhead in C++? (2 answers) Closed 12 days ago . Today a little argument erupted over the following code line in a fairly time critical piece of C++ that was running. void func(std::string& str) { ... uint8_t buffer[str.size() + 10]; ... } Now obviously you can compile this in C as the standard supports dynamically sized arrays. However GCC C++ seems to
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