iopipe v0.0.4 - RingBuffers!

[Steven Schveighoffer]

On 5/11/18 5:55 AM, Kagamin wrote:
> On Thursday, 10 May 2018 at 23:22:02 UTC, Steven Schveighoffer wrote:
>> However, I am struggling to find a use case for this that showcases 
>> why you would want to use it. While it does work, and works 
>> beautifully, it doesn't show any measurable difference vs. the array 
>> allocated buffer that copies data when it needs to extend.
> 
> Depends on OS and hardware. I would expect mmap implementation to be 
> slower as it reads file in chunks of 4kb and relies on page faults.

As Dmitry hinted at, there actually is no file involved. I'm mapping 
just straight memory to 2 segments. In fact, in my test application, I'm 
using stdin as the input, which may not even involve a file.

It's just as fast as using memory, the only cool part is that you can 
write a buffer that wraps to the beginning as if it were a normal array.

What surprises me is that the copying for the normal buffer doesn't hurt 
performance that much. I suppose this should probably have been 
expected, as CPUs are really really good at processing consecutive 
memory, and the copying you end up having to do is generally small 
compared to the rest of your app.

-Steve