ram

I have a MySQL innodb database at 1.9GB, showed by following command. SELECT table_schema "Data Base Name" , sum( data_length + index_length ) / 1 048 576 as "Data Base Size in MB" , sum( data_free )/ 1 048 576 as "Free Space in MB" FROM information_schema.TABLES GROUP BY table_schema ; +--------------------+----------------------+------------------+ | Data Base Name | Data Base Size in MB | Free Space in MB | +--------------------+----------------------+------------------+ | database_name | 1959.73437500 | 31080.00000000 | My questions are: Does it mean if I set the innodb_buffer_pool_size to

1.DSP程序的串口下载方式。 这种方式可以省了买仿真器的一笔很大的花费，这个电路上有什么特别之处么？跟一般的串口通讯电路有何不同？ 是不是一片Max232加几个电容，然后接到芯片上的相应引脚就行了？ 相比JTAG来说，串口是只能下载不能在线仿真么？ 2.外扩存储器问题。 看了好多网上卖的开发板，发现都有扩展的RAM和ROM，弱弱的问一句，难道是因为DSP本身的存储器不够大么？ 我看2812的存储器挺大的，为啥非得外扩呢？不外扩有什么缺点呢？ 对于我这样刚入手的来说，画板子的时候要不要加外扩存储器呢？ 第一个问题，建议你还是用jtag方式下载，毕竟现在主流的方式是这样的，出现问题可以交流的人会比较多。 第二个问题，存储器没有嫌大的，因此如果程序小，不外扩没有问题，如果程序大或者里面有大量的字库等等肯定需要外扩了。 1.DSP程序的串口下载方式。 -- 建议使用jtag调试。相比以前来讲，ti已经放出xds100v2仿真器，而且ccs4.x以上版本支持很好。重点是价格便宜，呵呵，相比以前买的合仿真器（1700大洋）。 -- 2812支持sci下载代码，支持scia。这点很方便现场工程师更新代码。 -- max232这个芯片不大合适。因为这个芯片要求5V电源的，2812接口电压是3.3V。 2.外扩存储器问题。 -- 这个问题，应该是自己来决定的问题。即做出来这个板子到底做什么？ --

We use a Tool (Whats Up Gold) to monitor memory usage on a Linux Box. We see Memory usage (graphs) related to: Physical, Real, Swap, Virtual Memory and ALL Memory ( which is a average of all these ). 'The ALL' Memory graphs show low memory usage of about: 10%. But Physical memory shows as 95% used. Swap memory shows as 2% used. So, do i need more memory on this Linux Box? In other words should i go by: ALL Memory graph(which says memory situation is good) OR Physical Memory Graph (which says memory situation is bad). Real and Physical Physical memory is the amount of DRAM which is currently

I've got a little problem about leaking memory in a Mechanize Ruby script. I "while loop" multiple web pages access forever and memory increase a lot on each loop. That created a "failed to allocate memory" after minutes and made script exit. In fact, it seems that the agent.get method instantiate and hold the result even if I assign the result to the same "local variable" or even a "global variable". So I tried to assign nil to the variable after last used and before reusing the same name variable. But it seems that previous agent.get results are still in memory and really don't know how to

This is a noob question about computer science: How is ram allocated? Fo example, I use Windows. Can I know which adresses are used by a program? How does Windows allocate memory? Contiguous or non contiguous? Is it the same thing on Linux OSes ? And, can I have access to the whole ram with a program? (I don't believe in that, but...) Do you know any good lectures/documentation on this? First, when you think you are allocating RAM, you really are not . This is confusing, I know, but it's really not complicated once you understand how it works. Keep reading. RAM is allocated by the operating