caching

问题 I've read about single cache-control header value. To test what I learned, I opened facebook and inspect. This is the Cache-Control response header I get: cache-control:private, no-cache, no-store, must-revalidate I am confused what this header actually tells, because it contains 4 values at once. So what happens with the resource send through the network, if it contains such header? EDIT: no-store says, "do not store at all, not in private not public caches", and no-cache says "yeees you can

问题 I've read about single cache-control header value. To test what I learned, I opened facebook and inspect. This is the Cache-Control response header I get: cache-control:private, no-cache, no-store, must-revalidate I am confused what this header actually tells, because it contains 4 values at once. So what happens with the resource send through the network, if it contains such header? EDIT: no-store says, "do not store at all, not in private not public caches", and no-cache says "yeees you can

问题 I have a vps with zpanel installed and apache2 - php - mysql. I'm developing a small backend for a website in php, for sites ready to publish the situation is perfect, but now I need to disable the server feature that caches php files to test instantly the correct (last modified version) of my php files. This is because while html and js files, when edited, are reloaded correctly immediately, with php I have a long wait before it updates or I have to restart the server. I tried to open php

问题 How to set Redis Cache expiration to 1 year? I tried to set the long value on the xml configuration to : 31556952000 (1 year), but then it caught an exception that type Integer doesn't recognize the value as Integer. I tried to search at Google, and it says that Integer maximum value is up to 2147483647 , which means, if I set to that maximum value, I only get my cache expires on 24 days. Here is my applicationContext.xml (I omitted unnecessary code) : ... <cache:annotation-driven /> <bean id

问题 How to set Redis Cache expiration to 1 year? I tried to set the long value on the xml configuration to : 31556952000 (1 year), but then it caught an exception that type Integer doesn't recognize the value as Integer. I tried to search at Google, and it says that Integer maximum value is up to 2147483647 , which means, if I set to that maximum value, I only get my cache expires on 24 days. Here is my applicationContext.xml (I omitted unnecessary code) : ... <cache:annotation-driven /> <bean id

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Improve this question I need really fast and persistent cache for my web crawler. It doesnt need to be as fast as ConcurrentSkipListSet in Java, but definitely it cannot be MySQL with hash-index based table, which i tried. After 1m+ of records it takes like 80% of processor time. Does

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Improve this question I need really fast and persistent cache for my web crawler. It doesnt need to be as fast as ConcurrentSkipListSet in Java, but definitely it cannot be MySQL with hash-index based table, which i tried. After 1m+ of records it takes like 80% of processor time. Does

问题 In guava, when using LoadingCache CacheLoader is called synchronously. However, my load() operation may take too long (~1 sec), I want to take a default action in case it takes too long (>200 ms) and load the value asynchronously. Is there a way to achieve this? Or are there any other approaches you can recommend? 回答1: The Caffeine library is a Java 8 rewrite of Guava's cache that allows asynchronous automatic loading of entries into a cache, returning CompletableFutures. It is written by

问题 In guava, when using LoadingCache CacheLoader is called synchronously. However, my load() operation may take too long (~1 sec), I want to take a default action in case it takes too long (>200 ms) and load the value asynchronously. Is there a way to achieve this? Or are there any other approaches you can recommend? 回答1: The Caffeine library is a Java 8 rewrite of Guava's cache that allows asynchronous automatic loading of entries into a cache, returning CompletableFutures. It is written by

问题 I'm trying to come up with an example program which would have a high cache-miss rate. I thought I could try accessing a matrix column by column like so: #include <stdlib.h> int main(void) { int i, j, k; int w = 1000; int h = 1000; int **block = malloc(w * sizeof(int*)); for (i = 0; i < w; i++) { block[i] = malloc(h * sizeof(int)); } for (k = 0; k < 10; k++) { for (i = 0; i < w; i++) { for (j = 0; j < h; j++) { block[j][i] = 0; } } } return 0; } when I compile this with -O0 flag and run using