caching
How can I prevent a Dockerfile instruction from being cached?
A build-time argument can be specified to forcibly break the cache from that step onwards. For example, in your Dockerfile, put ARG CACHE_DATE=not_a_date and then give this argument a fresh value on every new build. The best, of course, is the timestamp. docker build –build-arg CACHE_DATE=$(date +%Y-%m-%d:%H:%M:%S) … Make sure the value is a string … Read more
NGINX caching proxy fails with SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
I had the exactly same problem and spent a couple of hours… I guess you are using older version of nginx (lower than 1.7)? In nginx 1.7 you can use this directive: proxy_ssl_server_name on; This will force nginx to use SNI Also, you should set the SSL protocols: proxy_ssl_protocols TLSv1 TLSv1.1 TLSv1.2; For earlier versions … Read more
Why is the size of L1 cache smaller than that of the L2 cache in most of the processors?
L1 is very tightly coupled to the CPU core, and is accessed on every memory access (very frequent). Thus, it needs to return the data really fast (usually within on clock cycle). Latency and throughput (bandwidth) are both performance-critical for L1 data cache. (e.g. four cycle latency, and supporting two reads and one write by … Read more
Where does Redis store the data
Redis is a (sort of) in-memory noSQL database; but I found that my copy (running on linux) dumps to /var/lib/redis/dump.rdb
Caching Data in Web API
The solution I ended up using involved MemoryCache in the System.Runtime.Caching namespace. Here is the code that ended up working for caching my collection: //If the data exists in cache, pull it from there, otherwise make a call to database to get the data ObjectCache cache = MemoryCache.Default; var peopleData = cache.Get(“PeopleData”) as List<People>; if … Read more
what is the difference between l1 cache and l2 cache?
Both of these depend on the CPU. There are CPUs which have no cache at all, there are CPUs which have the L1 cache on die and the L2 cache on a separate die on the same chip or even on a separate chip, or there are CPUs which have both L1 and L2 cache … Read more
How do sites like LinkedIn efficiently display 1st/2nd/3rd-level relationship next to each person’s name?
You may be able to leverage axioms about small world networks to optimize this type of traversal. Small world networks are characterized by “hubs” the represent very dense interconnections of other nodes. Most nodes in the network will generally either connect within a few hops to a topologically nearby node (1-4 hops away) or will … Read more
cache miss, a TLB miss and page fault
Let me explain all these things step by step. The CPU generates the logical address, which contains the page number and the page offset. The page number is used to index into the page table, to get the corresponding page frame number, and once we have the page frame of the physical memory(also called main … Read more