Online researching shows that there are many plugins out there to perform caching on WP. Just to name a few: WP Super Cache W3 Total Cache WP Widget Cache DB Cache Reloaded 1 Blog Cacher Hyper Cache Is using just one plugin good, or is there a point in using more then one at the … Read more
To me it’s not clear what’s the difference between the two Linux memory concepts : buffer and cache. I’ve read through this post and it seems to me that the difference between them is the expiration policy: buffer’s policy is first-in, first-out cache’s policy is Least Recently Used. Am I right? In particular, I’m looking … Read more
My WordPress is always down. I contacted my host and they said that the server is fine. My WordPress site has some basic plugins which are all in one seo seo search tagging google xml robots.txt related post I can’t find what is my problem. I have some HTML files which are working fine, but … Read more
I have few thousands posts and need to list all of them in the admin. When I used WP_Query to get them all at once I got a memory error. Then I split it into several query calls and it worked just fine with 256 MB limit. Here is the code: $limit = 200; $offset … Read more
I used a variable with a lot of data in it, say String data. I wanted to use a small part of this string in the following way: this.smallpart = data.substring(12,18); After some hours of debugging (with a memory visualizer) I found out that the objects field smallpart remembered all the data from data, although … Read more
By considering that the memory is divided into four segments: data, heap, stack, and code, where do global variables, static variables, constant data types, local variables (defined and declared in functions), variables (in main function), pointers, and dynamically allocated space (using malloc and calloc) get stored in memory? I think they would be allocated as … Read more
Problem Some time ago I posted a question about the scalability of wp_usermeta architecture: my concern, as my client’s database of users is growing fast, is now the memory usage of querying the wp_usermeta table. In my situation, I am managing a CRM with thousands of users, each of which with around 15 meta fields. … Read more
I would like to monitor the following system information in Java: Current CPU usage** (percent) Available memory* (free/total) Available disk space (free/total) *Note that I mean overall memory available to the whole system, not just the JVM. I’m looking for a cross-platform solution (Linux, Mac, and Windows) that doesn’t rely on my own code calling … Read more
Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors? While this isn’t specifically a programming question, knowing these kinds of speed details is neccessary for some low-latency programming challenges. 5 Answers 5
I understand that the processor brings data into the cache via cache lines, which – for instance, on my Atom processor – brings in about 64 bytes at a time, whatever the size of the actual data being read. My question is: Imagine that you need to read one byte from memory, which 64 bytes … Read more