CPU cache. A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. A cache is a smaller, faster memory, closer to a processor core, which stores copies of the data from frequently used main memory locations. Most CPUs have different independent caches, including instruction and data caches, where the data cache is usually organized as a hierarchy of more cache levels (L1, L2, etc.).
USPS Tracking is a way for you to make sure that your most important packages make it to their final destinations. The US Postal Service can tell you the date, time and zip code where your item was delivered, giving you peace of mind.
Sending USPS Certified mail will ensure that your important pieces of mail, including legal and confidential documents, arrive at their intended destination. Follow this guide to either send Certified Mail from your local post office or to send Certified Mail online. 1. Visit a local post office and obtain a Certified Mail Form 3800. This form contains a green and white sticker that includes a barcode, which will allow you to track your mail through the USPS.