caching

问题 According to Laravel's documentation (https://laravel.com/docs/5.3/blade#introduction) views are compiled into plain PHP code and cached until they are modified but when are they re-compiled? I have my project in a production environment and when I deploy changes are automatically showed, I don't need to clear views cache or something similar. Are views re-compiled automatically (in that case, when does it happen?) or do I haven't cache enabled? 回答1: By default all views are compiled/cached .

问题 I'm reading What Every Programmer Should Know About Memory pdf by Ulrich Drepper. At the beginning of part 6 theres's a code fragment: #include <emmintrin.h> void setbytes(char *p, int c) { __m128i i = _mm_set_epi8(c, c, c, c, c, c, c, c, c, c, c, c, c, c, c, c); _mm_stream_si128((__m128i *)&p[0], i); _mm_stream_si128((__m128i *)&p[16], i); _mm_stream_si128((__m128i *)&p[32], i); _mm_stream_si128((__m128i *)&p[48], i); } With such a comment right below it: Assuming the pointer p is

问题 I am new for Apache Spark and I have couple of basic questions in spark which I could not understand while reading the spark material. Every materials have their own style of explanation. I am using PySpark Jupyter notebook on Ubuntu to practice. As per my understanding, When I run the below command, the data in the testfile.csv is partitioned and stored in memory of the respective nodes.( actually I know its a lazy evaluation and it will not process until it sees action command ), but still

问题 I recently learned about the row hammer attack. In order to perform this attack the programmer needs to flush the complete cache hierarchy of a CPU for a specific number of addresses. My question is: why is CLFLUSH necessary in x86? What are the reasons for ever using this instruction, if all L* caches act transparently (i.e., no explicit cache invalidation needed)? Besides that: isn't the CPU free to speculate memory access patterns, and thereby ignore the instruction altogether? 回答1: I

问题 Just learned these 3 new techniques from https://unix.stackexchange.com/questions/87908/how-do-you-empty-the-buffers-and-cache-on-a-linux-system: To free pagecache: # echo 1 > /proc/sys/vm/drop_caches To free dentries and inodes: # echo 2 > /proc/sys/vm/drop_caches To free pagecache, dentries and inodes: # echo 3 > /proc/sys/vm/drop_caches I am trying to understand what exactly are pagecache, dentries and inodes. What exactly are they? Do freeing them up also remove the useful memcached and

问题 I want to cache most recent records (say last 24 hrs) in a http firebase function. In a http firebase function (say fetchLastXRecords), I look for the record in cache (defined Global variable to store the records) if not found fetch from database and set cache. Problem arises when I want to update any record of cache because this Global variable is not accessible by other firebase functions (could be real time database change triggers). What could be a good approach to update the records in

问题 I want to cache two lists that got from Firebase to use to later when the user is offline This is the full code for my list display screen - import 'package:flutter/material.dart'; import 'package:naamaa/calculations/name-list-calc.dart'; List namesList = List(); List meaningsList = List(); class NameList extends StatefulWidget { @override _NameListState createState() => _NameListState(); } class _NameListState extends State<NameList> { Future<String> getPosts() async { var names = await

问题 Our current caching implementation caches large amounts of data in report objects (50MB in some cases). We’ve moved from memory cache to file cache and use ProtoBuf to serialize and de-serialize. This works well, however we are now experimenting with Redis cache. Below is an example of how much longer it takes for Redis than using the file system. (Note: using protobuf instead of JsonConvert improves set time to 15 seconds and get time to 4 seconds in the below example, when setting a byte

问题 PHP Colleagues: This question relates to best practices for using Laravel Cache. The central objective is to reduce the number of accesses to the database for all the usual performance-related reasons. The application is a read-intensive news site with perhaps a dozen controllers at most, mostly resource-type. Are there any documented best practices for the application design? It seems obvious to me that since Cache:: is a one-line statement, it's easy to drop this into the controllers --

问题 PHP Colleagues: This question relates to best practices for using Laravel Cache. The central objective is to reduce the number of accesses to the database for all the usual performance-related reasons. The application is a read-intensive news site with perhaps a dozen controllers at most, mostly resource-type. Are there any documented best practices for the application design? It seems obvious to me that since Cache:: is a one-line statement, it's easy to drop this into the controllers --