请教大家一个 redis 内存占用的问题

我用 del 命令删除了 redis 里五分之一的数据，可是 redis 的内存占用并没有下来， rdb 文件可以看到变小了的，只有 redis 重启才会降低内存占用，可是 redis 不能重启的。这是什么原因呢？我删数据就是为了减少...

我想大声告诉你 2017-04-27 09:02:10 0  0  638

redis和memcached是不是存储多少空间就占多少内存？

这些内存数据库都是把数据放到内存里，作为缓存的话，是不是存储多少内容就占用多少内存呢？ 比如我的Linux服务器是2G内存的，那使用他们作为缓存数据库，就不能缓存超过2G的内容呢？

ringa_lee 2017-04-27 09:02:23 0  2  918

In JS, does 'a' occupy 2 bytes or 1 byte in memory?

1. In JS, does 'a' occupy 2 bytes or 1 byte in memory? JS is encoded in UCS-2, so it should take up 2 bytes, right? 2. Are JS strings encoded the same in different engines? 3. In JS, how does a string represent the "end" in memory? Is it also necessary to add a \0?

世界只因有你 2017-07-05 10:46:22 0  2  1207

The relationship between obtaining file input stream and memory usage in JAVA

A Java program obtains the input stream of a file, such as the input stream of a 50M text file. At this time, has the program loaded the entire file into memory? Has it occupied 50M of space in memory? Or is there just one entrance, and you need to loop through the contents...

三叔 2017-06-15 09:21:27 0  3  1052

android - When starting the application, nothing is done in MainActivity and setcontent is not executed. Why is the memory occupied 25m?

When starting the application, nothing is done in MainActivity and setcontent is not executed. Why does the memory usage only reach 25m?

高洛峰 2017-05-16 13:32:41 0  1  583

A question about PHP memory management

I wrote a file to test the memory usage of PHP. I found that there is a difference in the memory occupied after the variables are arrays and objects after they are released. I would like to ask why. The following is the code, running in PHP 7.0 CLI mode. Array: {code...} Output: {code...} Object: {c...

给我你的怀抱 2017-05-16 13:11:22 0  2  454

Solution to the memory usage problem caused by upsertMany in Nest.js

There is a scheduled task that is executed every 5 minutes when using upsertMany to insert a large amount of data. I found that the memory increases every time a task is executed and the GC cannot reclaim the memory. How can I solve this problem? Using nestjs, @mikro-orm/nestjsthis.emBi.upsertMany(S...

P粉787806024 2023-08-15 23:04:41 0  1  675

How to solve the problem that php-cgi does not release the memory and the memory is full

The system is a Windows+Apache system, which will generate many PHPcgi processes but will not release resources. Finally, the memory will be 100% and the system will freeze. Is there any way to solve it?

哇哈哈 2020-04-22 13:37:02 0  0  846

Using an extremely long List in Python results in excessive memory usage

I need to use a List with a length of more than 500,000 in a program, but the result is that the memory usage increases instantly. What method should be used to optimize it?

扔个三星炸死你 2017-07-05 10:51:29 0  1  1496

mongodb 3.0.2 wiredtiger cacheSizeGB 限制内存使用问题

按理说 mongodb 3.0.2 wt 引擎配置 cacheSizeGB 后应该可以限制内存使用了啊，但是，俺们 2G 内存的机器配置这个参数为 1G 后，慢慢的内存还是能用到 80% 。。。 这是为啥？ 俺们对这个参数的理解有误？

阿神 2017-04-25 09:03:22 0  1  976

After the website goes online, Apache quickly takes up all the memory and causes the server to crash.

There is a company website with more than 6,000 IP visits per month. The server configuration was changed to a 4G memory centos server. Apache 2.4 is used as the website server. The website uses pseudo-static reverse proxy access through the proxy server. Just about 5 minutes after it went online, a...

ringa_lee 2017-05-16 16:57:22 0  1  677

Objective-c - What is the relationship between iOS memory management [ARC, MRC, memory pool]?

1. There are three methods of iOS memory management: ARC, MRC, and memory pool. 2.MRC: Follow the principle of who applies, who adds, and who releases. Additions and modifications to memory technology require manual handling. Starting from iOS in 2012, it has been gradually replaced by ARC (automati...

PHP中文网 2017-05-02 09:25:59 0  4  900

java - Does ehcache cache use virtual machine memory?

Does ehcache cache use virtual machine memory or other memory? Is the bottom layer of ehcache map? How does he implement caching?

大家讲道理 2017-06-23 09:13:46 0  1  1137

Can jq object circular references cause memory leaks?

It is known that circular references to DOM objects in closures will cause memory leaks in lower versions of IE. So will circular references to JQ objects cause memory leaks? For example: Will the following functions cause memory leaks? {code...}

阿神 2017-05-19 10:47:28 0  1  722

用redis作缓存，服务器内存1G够不够用？

因为redis缓存在内存中，在服务器内存只有1G时，用redis缓存够不够用的？只是用来缓存访问信息的，例如IP、访问时长、访问来源有没意义？？例如并发100……

phpcn_u1582 2017-04-28 09:04:32 0  3  985

The relationship between memory and data,

What is the relationship between memory and data?

李馨苒 2017-08-16 16:18:40 0  1  1222

Best practices for Apache memory and processes under high load

Check whether Apache is running in prefork working mode {code...} View the memory currently occupied by each process {code...} The RES column is the amount of memory used by the Apache process, the sixth column from the left. Calculate the number of processes. The maximum number of processes = the t...

为情所困 2017-05-16 17:03:02 0  1  805

objective-c - UIImageJPEGRepresentation内存泄露问题

多次使用UIImageJPEGRepresentation(data,1.0)造成内存一直涨,有什么方法取代UIImageJPEGRepresentation方法吗，求大神解答下

过去多啦不再A梦 2017-04-28 09:04:44 0  2  1188

PHP read content memory issue

PHP read content memory problem: A PHP file, the content is probably a json (exported from the database, to avoid frequent access to the database) array format, the content size of this file is 200K, and the memory of the server is 1G, then when there are 6 users access the file at the same time req...

高洛峰 2017-05-31 10:33:19 0  2  666

Redis作为一款基于内存的数据库，系统的内存会对存储量有影响吗?

Redis作为一款基于内存的数据库，系统的内存会对存储量有影响吗?

为情所困 2017-04-27 09:03:51 0  0  705