“When the light has been removed and my wife has fallen silent, aware of this habit that’s now mine, I examine my entire

While this naturally happens when you straighten your back and keep your shoulders down and back, make sure you’re not doing anything to block your torso as well. Don’t cross your arms in front of your chest or hold your drink or phone in front of your chest. It makes you appear closed off.,Since the issue is the OS page cache, what happens if you just open a file with Direct I/O, all else being equal? Unfortunately that likely won’t get faster either. But that’s because of our third and last issue:,In my opinion, determinants are hands down one of the most challenging concepts to grasp in linear algebra. Depending on your learning resource, it is usually defined by either a recursive definition or a sum that iterates through all permutations. None of them are tractable without significant experience in mathematics.,A file is seen as a sequential stream of bytes, and whether data is in-memory or not is transparent to the reader. Traditional APIs will wait until you touch data that is not resident to issue an I/O operation. The I/O operation may be larger than what the user requested due to read-ahead, but is still just one.,If you feel tempted to validate my claim that reading from multiple files shouldn’t be fundamentally slower than reading from a single file, you may end up proving yourself right, but only because read amplification increased by a lot the amount of data effectively read.,Direct I/O is full of caveats, and io_uring being a raw interface doesn’t even try (nor should it) to hide these problems: For example, memory must be properly aligned, as well as the positions where you are reading from.,I have written extensively in the past about how revolutionary io_uring is. But being a fairly low level interface it is really just one piece of the API puzzle. Here’s why:,You also want to avoid your shoulders drifting too close to your ears. When your shoulders are high, it makes you look stressed and uncomfortable. To retain your look of cool calm, be mindful of where your shoulders are and purposefully make sure they stay down and back.,After working together just a few weeks, I saw a drastic change in his affect and demeanor, and it wasn’t long after that that he began dating the woman he’s now married to.,Using multiple files is a step in the right direction, as it allows more effectively parallelism: while one reader is waiting, another can hopefully proceed. But if you are not careful you just end up amplifying one of the previous problems:,The operating system reads data in page granularity, meaning it can only read at a minimum 4kB at a time. That means if you need to read read 1kB split in two files, 512 bytes each, you are effectively reading 8kB to serve 1kB, wasting 87% of the data read. In practice, the OS will also perform read ahead, with a default setting of 128kB, in anticipation of saving you cycles later when you do need the remaining data. But if you never do, as is often the case for random I/O, then you just read 256kB to serve 1kB and wasted 99% of it.,Your momma, teachers, or whoever told you to “have good posture” were right. Sitting or standing up straight increases your lung capacity, allowing more oxygen to get to your brain. Proper posture can actually help you think more clearly and feel calmer.,Dave had had such a bad dating run that he didn’t feel confident, so he didn’t look confident. Conversely, he knew what to expect in the courtroom, and he knew he was great at what he did.,There’s more too. In one test, a group of men had their blood drawn after holding proper posture. They experienced a 20% increase in testosterone and a 25% decrease in cortisol, the hormone that contributes to stress.,Your body language can make a bigger impact on your romantic life than any outfit, joke, or wad in your wallet. It’s also something you can easily change. Whether you feel confident or not doesn’t matter. Fake it ’til you make it, gentlemen!