You also want to avoid your shoulders drifting too close to your ears. When your shoulders are high, it makes you look s

Over the course of our introductory chat, I learned he was intelligent, passionate about making a difference as an environmental lawyer, and funny. But I also observed that he rarely looked me in the eye, mostly casting them around the room.

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oosing our thoughts is a spiritual practice in itself. Many people talk about the mind-body-spirit connection. Our experiences of our thoughts are spiritual experiences because our thoughts represent a conversation: they’re us talking to ourselves.

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.

Although there are some details I will brush over (like memory used by file descriptors, the various metadata caches in Linux), if modern NVMe support many concurrent operations, there is no reason to believe that reading from many files is more expensive than reading from one. However the aggregate amount of data read certainly matters.

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:

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:

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.

A quick back-of-the-napkin calculation shows that in the worst case, less than half of the total busy cost is the cost of communication with the device per se. That’s not counting all the waste, which brings us to the second problem:

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.

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.

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.

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!

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:

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.